Method for preparing pectin composite fiber microsphere powder based on high-voltage pulse combined fluidized bed process and product thereof

Abstract

The present invention provides a method for preparing pectin composite fiber microsphere powder based on high-voltage pulse combined with fluidized bed process and its product, which relates to the field of fluidized bed spray drying technology. The method comprises: ultrafinely grinding composite fibers to obtain composite fiber powder; wherein the composite fibers include low-fat pectin, oat fiber, flax seed fiber and guar fiber; high-speed dispersing and homogenizing the composite fiber powder and water to obtain a suspension; high-voltage pulse treatment of the suspension, and then spraying the treated suspension on the surface of a carrier through a fluidized bed spray drying process to obtain pectin composite fiber microsphere powder. The present invention can pierce the molecular chains of the composite fiber powder containing pectin through high-voltage pulse current, prompting its branch chains to open, so as to increase the contact probability between molecular chains; through the fluidized bed spray drying process, the solubility and dissolution rate of the composite fiber microsphere powder are improved, and the agglomeration phenomenon is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of fluidized bed spray drying, and particularly relates to a method for preparing pectin composite fiber microsphere powder based on high-voltage pulse combined with fluidized bed process and its product. Background Art

[0002] Pectin is a natural linear macromolecular heteropolysaccharide with a complex structure widely distributed in plants in nature. According to the proportion of methyl ester groups in pectin molecules, pectin can be divided into high-ester pectin (esterification degree higher than 50%) and low-ester pectin (esterification degree lower than 50%). High-ester pectin usually forms a gel under high-sugar and high-acid conditions, while low-ester pectin needs to add divalent metal ions (usually calcium ions) under low-sugar conditions to form a "egg box" model with the free carboxylate groups after de-esterification to form a network gel structure. In this egg box model, the galacturonic acid sequences participating in the gel adopt a double-folded "zigzag" configuration. After calcium ions are integrated with carboxyl groups inside two pectin chains, they further helically aggregate to form a gel.

[0003] CN102553499A discloses a method for preparing microcapsules based on the gelation of low-ester pectin and calcium ions and its application. The steps are as follows: (1) Prepare a low-ester pectin solution: Prepare a low-ester pectin solution containing 2-12% by mass of low-ester pectin with 1 / 4 of the water consumption for the whole preparation process; (2) Prepare a CaCl2 solution: Prepare a CaCl2 solution containing 0.01-0.08% by mass of CaCl2 with 3 / 4 of the water consumption for the whole preparation process; (3) Prepare a low-ester pectin-calcium ion solution: While stirring the low-ester pectin solution, slowly add the CaCl2 solution into it and continue stirring to form a low-ester pectin-calcium ion solution; (4) Mix the core material: While stirring, add the core material into the low-ester pectin-calcium ion solution and continuously stir until the mixture presents a homogeneous state; (5) Dry and gel into particles: Spray-dry the low-ester pectin-calcium ion-core material mixture, and the low-ester pectin and calcium ions gel with the evaporation of water to form a microcapsule product in which the wall material components are organically combined.

[0004] CN119215799A discloses a method for preparing controllable dissolution microspheres based on sodium alginate and pectin, including: obtaining a sodium alginate solution and a pectin solution, mixing the sodium alginate solution and the pectin solution based on a first preset ratio, and using a preset stirring device to stir and mix evenly to obtain a mixed gel solution; mixing a pre-constructed calcium chloride aqueous solution and absolute ethanol based on a second preset ratio, and using a stirring device to stir and mix evenly to obtain a cross-linking agent solution; dripping the mixed gel solution into the cross-linking agent solution by a preset dripping method, and obtaining mixed gel beads in the cross-linking agent solution, and washing the mixed microgel beads to obtain controllable dissolution microspheres.

[0005] CN113893791A discloses a method for preparing betanin-pseudocapsice pectin gel. The preparation method includes: (1) extracting pseudocapsice seed pectin, dissolving it in distilled water, and stirring overnight at 40-60 °C to form a 1-5% pectin solution; (2) adding 1-3% betanin to the pectin solution and stirring at room temperature for 10-20 min to form a betanin-pseudocapsice seed pectin complex; (3) placing the betanin-pseudocapsice seed pectin complex at 4 °C for 10-15 h to form a gel, and storing it at room temperature; wherein, in step (2), after adding betanin, it also includes adding a calcium chloride solution and adjusting the pH value. The concentration of the calcium chloride solution is 1.0 g / L; the adjusted pH value range is 4.

[0006] As described above, low-fat pectin in the above patent needs to be in a calcium ion environment to form a gel. In addition, when ordinary pectin initially contacts water, it is extremely prone to hydration, that is, water can only penetrate limitedly to the surface of the pectin powder, locally transforming the glassy region into a rubbery state, and then swelling to form a viscous surface gel, which will cause the pectin powders to adhere to each other and form lumps. Unless the lumps are broken under a high shear rate, usually, the dissolution of pectin requires mixing with three times the amount of diluting materials such as sucrose and then adding it to water.

[0007] Therefore, there is an urgent need to develop a product that can be directly dissolved in water without other conditions such as low sugar or divalent metal ions and can quickly form a gel in gastric acid to meet diverse food needs.

[0008] In view of this, the present invention is specifically proposed. Summary of the Invention

[0009] One object of the present invention is to provide a method for preparing pectin composite fiber microsphere powder based on a high-voltage pulse combined with a fluidized bed process. Through the high-voltage pulse current of the present invention, the molecular chains of the composite fiber powder containing pectin can be pierced, promoting the opening of its branched chains and facilitating the increase of the contact probability between molecular chains; through the fluidized bed spray drying process, the solubility and dissolution rate of the composite fiber microsphere powder are improved, and the caking phenomenon is reduced.

[0010] Another object of the present invention is to provide a pectin composite fiber microsphere powder, which is prepared by the above preparation method. After the pectin composite fiber microsphere powder is dissolved in water again, in an acidic environment, especially under gastric acid conditions, it can quickly form a gel through self-assembly without calcium ions as the bridging point for gel formation.

[0011] A third object of the present invention is to provide a pectin composite fiber gel, which is prepared by combining the above pectin composite fiber microsphere powder and gastric acid.

[0012] A fourth object of the present invention is to provide a method for preparing a pectin composite fiber gel, and the preparation method includes: dissolving the pectin composite fiber microsphere powder in water to obtain a microsphere powder solution; mixing the microsphere powder solution with simulated gastric juice to form the composite fiber gel.

[0013] In order to achieve the above object of the present invention, the following technical solutions are specifically adopted:

[0014] In a first aspect, the present invention provides a method for preparing pectin composite fiber microsphere powder based on a high-voltage pulse combined with a fluidized bed process, and the method includes the following steps:

[0015] Ultra-finely pulverize the composite fiber to obtain composite fiber powder; wherein, the composite fiber includes low-fat pectin, oat fiber, flaxseed fiber and guar gum fiber; the pressure of the ultra-fine pulverization is 2-6 MPa, and the air flow velocity is 200-285 m / s;

[0016] High-speed disperse and homogenize the composite fiber powder and water to obtain a suspension; wherein, the rotation speed of the high-speed disperse and homogenize is 15000-25000 r / min;

[0017] Subject the suspension to high-voltage pulse treatment, and then spray the treated suspension on the surface of the carrier through a fluidized bed spray drying process to obtain pectin composite fiber microsphere powder; wherein, the process parameters of the high-voltage pulse treatment include: pulse frequency is 1-2 kHz, pulse width is 10-50 μs, flow rate is 10-20 L / h, electric field strength is 10-50 kV / cm, and pulse treatment time is 100-500 μs; the process parameters of the fluidized bed spray drying process include: spray mode is top spray, inlet air temperature is 80-100 °C, material temperature is 55-75 °C, fan frequency is 20-50 Hz, atomization pressure is 0.1-0.3 Mpa, and the liquid feed flow rate of the suspension is 20-80 g / min.

[0018] Preferably, the composite fiber includes the following components by mass percentage: 50-70% of low-fat pectin, 5-20% of oat fiber, 5-20% of flaxseed fiber and 5-20% of guar gum fiber.

[0019] Preferably, the degree of esterification of the low-fat pectin is 20-40%.

[0020] Preferably, the molecular weight of the low-fat pectin is 10000-20000 g / mol.

[0021] Preferably, the ultra-fine pulverization is carried out in a pneumatic ultra-fine pulverizer.

[0022] Preferably, the time of the ultra-fine pulverization is 1-3 h.

[0023] Preferably, the particle size of the composite fiber powder is 10 - 50 μm.

[0024] Preferably, the mass ratio of the composite fiber powder to water is 1:(10 - 20).

[0025] Preferably, the process parameters of the high - speed dispersion and homogenization include: the single - time homogenization time is 30 s - 2 min, the number of homogenization times is 1 - 5 times, and the interval time is 10 - 40 s.

[0026] Preferably, the carrier includes resistant dextrin.

[0027] Preferably, the mass ratio of the carrier to the suspension is (3 - 4):1.

[0028] In a second aspect, the present invention provides a pectin composite fiber microsphere powder, which is prepared by the method for preparing pectin composite fiber microsphere powder based on the high - voltage pulse combined with fluidized bed process as described in the first aspect.

[0029] In a third aspect, the present invention provides a pectin composite fiber gel, which is prepared by combining the pectin composite fiber microsphere powder as described in the second aspect with gastric acid.

[0030] In a fourth aspect, the present invention provides a preparation method of the pectin composite fiber gel as described in the third aspect, and the preparation method includes:

[0031] Dissolve the pectin composite fiber microsphere powder in water to obtain a microsphere powder solution;

[0032] Mix the microsphere powder solution with simulated gastric juice to form the composite fiber gel.

[0033] Preferably, the mass ratio of the pectin composite fiber microsphere powder to water is 1:(100 - 200).

[0034] Preferably, the mass ratio of the pectin composite fiber microsphere powder to simulated gastric juice is 1:(40 - 60).

[0035] Preferably, the time for forming the composite fiber gel ≤60 s.

[0036] Preferably, the magnification for forming the composite fiber gel ≥90 times.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] (1) In the present invention, the high-voltage pulsed current formed by pulsed electric fields can pierce the molecular chains of pectin and composite fibers, prompting the opening of their branched chains and facilitating an increase in the contact probability between molecular chains. After redissolving in water, it can rapidly form a gel through self-assembly under gastric acid conditions without the need for calcium ions as the bridging points for gel formation.

[0039] (2) In the present invention, pectin composite fiber microsphere powder is prepared by fluidized bed spray drying. Its powder is spherical, with a small contact area between each other, can be rapidly dissolved in water, reducing caking phenomena and improving application efficiency.

[0040] (3) The pectin composite fiber microsphere powder prepared by the high-voltage pulse combined with the fluidized bed process in the present invention is dissolved in water, rapidly forms a gel when encountering gastric acid in the stomach, simultaneously wraps carbohydrates such as starch, and delays the absorption of the latter, playing a role in reducing the rapid increase in postprandial blood glucose. Detailed implementation manners

[0041] Unless otherwise defined herein, scientific and technical terms used in conjunction with the present invention shall have the meanings commonly understood by those of ordinary skill in the art. The meanings and scopes of the terms should be clear. However, in any case of potential ambiguity, the definitions provided herein shall prevail over any dictionary or extrinsic definition. In this application, unless otherwise specified, the use of "or" means "and / or". In addition, the use of the term "comprising" and other forms is non-restrictive.

[0042] It should be noted that specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific implementation manners disclosed below.

[0043] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0044] In a first aspect, the present invention provides a method for preparing pectin composite fiber microsphere powder based on a high-voltage pulse combined with a fluidized bed process, and the method includes the following steps:

[0045] Ultrafine pulverize the composite fibers to obtain composite fiber powder; wherein, the composite fibers include low-fat pectin, oat fiber, flaxseed fiber, and guar gum fiber;

[0046] High-speed disperse and homogenize the composite fiber powder and water to obtain a suspension;

[0047] The suspension is subjected to high - voltage pulse treatment, and then the treated suspension is sprayed on the surface of the carrier through a fluidized - bed spray - drying process to obtain pectin composite fiber microsphere powder.

[0048] In the present invention, pectin is selected and mixed with oat fiber, flaxseed fiber, and guar gum fiber, and then subjected to ultrafine grinding. Then it is placed in a high - speed homogenizer, and purified water is added and stirred to dissolve to form a suspension. Then, through high - voltage pulsed - electric - field technology, the molecular chain branches of the four fibers (gums) are broken through and opened. After spray - drying, pectin composite fiber powder is formed.

[0049] Among them, the high - voltage pulsed current formed by pulsed electric field in the present invention can pierce the molecular chains of pectin and composite fibers, prompting the opening of their branches, which is convenient for increasing the contact probability between molecular chains. After redissolving, under acidic conditions, especially under gastric acid conditions, the positive and negative electric groups in the pectin composite fiber self - assemble and wind around each other to form a network structure, quickly forming a gel, replacing the egg - box structure formed with calcium ions when low - fat pectin gels, and there is no need for calcium ions as the bridging point for gel formation.

[0050] Among them, the pectin composite fiber microsphere powder prepared by fluidized - bed spray - drying in the present invention has spherical powder, with a small contact area between each other, can be quickly dissolved in water, reducing the caking phenomenon and improving the application efficiency.

[0051] As an alternative embodiment, the composite fiber comprises the following components by mass percentage: 50 - 70% of low - fat pectin, 5 - 20% of oat fiber, 5 - 20% of flaxseed fiber, and 5 - 20% of guar gum fiber.

[0052] As an alternative embodiment, based on the total mass of the composite fiber being 100%, the content of low - fat pectin is 50 - 70%, for example, it can be 50%, 52%, 54%, 55%, 56%, 58%, 60%, 62%, 64%, 65%, 66%, 68%, 70%, etc.

[0053] As an alternative embodiment, based on the total mass of the composite fiber being 100%, the content of oat fiber is 5 - 20%, for example, it can be 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, etc.

[0054] As an alternative embodiment, based on the total mass of the composite fiber being 100%, the content of flaxseed fiber is 5 - 20%, for example, it can be 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, etc.

[0055] As an alternative embodiment, based on the total mass of the composite fiber being 100%, the content of guar bean fiber is 5-20%, for example, it can be 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, etc.

[0056] As an alternative embodiment, the degree of esterification of the low-methoxyl pectin is 20-40%, for example, it can be 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, etc.

[0057] As an alternative embodiment, the molecular weight of the low-methoxyl pectin is 10,000-20,000 g / mol, for example, it can be 10,000 g / mol, 12,000 g / mol, 14,000 g / mol, 15,000 g / mol, 16,000 g / mol, 18,000 g / mol, 20,000 g / mol, etc.

[0058] As an alternative embodiment, the ultrafine grinding is carried out in a pneumatic ultrafine grinder.

[0059] As an alternative embodiment, the process parameters of the ultrafine grinding include: the grinding pressure is 2-6 MPa, the air flow velocity is 200-285 m / s, and the grinding time is 1-3 h.

[0060] As an alternative embodiment, the grinding pressure is 2-6 MPa, for example, it can be 2 MPa, 2.5 MPa, 3 MPa, 3.5 MPa, 4 MPa, 4.5 MPa, 5 MPa, 5.5 MPa, 6 MPa, etc.

[0061] As an alternative embodiment, the air flow velocity is 200-285 m / s, for example, it can be 200 m / s, 210 m / s, 220 m / s, 230 m / s, 240 m / s, 250 m / s, 260 m / s, 280 m / s, 285 m / s, etc.

[0062] As an alternative embodiment, the grinding time is 1-3 h, for example, it can be 1 h, 1.2 h, 1.4 h, 1.5 h, 1.6 h, 1.8 h, 2 h, 2.2 h, 2.4 h, 2.5 h, 2.6 h, 2.8 h, 3 h, etc.

[0063] As an alternative embodiment, the particle size of the composite fiber powder is 10 to 50 μm, for example, it can be 10 μm, 12 μm, 14 μm, 16 μm, 18 μm, 20 μm, 22 μm, 24 μm, 26 μm, 28 μm, 30 μm, 32 μm, 34 μm, 36 μm, 38 μm, 40 μm, 42 μm, 44 μm, 46 μm, 48 μm, 50 μm, etc.

[0064] As an alternative embodiment, the mass ratio of the composite fiber powder to water is 1:(10 - 20), for example, it can be 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, etc.

[0065] As an alternative embodiment, the water includes purified water.

[0066] As an alternative embodiment, the process parameters of high - speed dispersion and homogenization include: the homogenization speed is 15000 - 25000 r / min, the homogenization time is 30 s - 2 min, the number of homogenization times is 1 - 5 times, and the interval time is 10 - 40 s.

[0067] As an alternative embodiment, the speed of high - speed dispersion and homogenization is 15000 - 25000 r / min, for example, it can be 15000 r / min, 16000 r / min, 17000 r / min, 18000 r / min, 19000 r / min, 20000 r / min, 21000 r / min, 22000 r / min, 23000 r / min, 24000 r / min, 25000 r / min, etc.

[0068] As an alternative embodiment, the homogenization time is 30 s - 2 min, for example, it can be 30 s, 40 s, 50 s, 1 min, 1.2 min, 1.4 min, 1.6 min, 1.8 min, 2 min, etc.

[0069] As an alternative embodiment, the number of homogenization times is 1 - 5 times, for example, it can be 1 time, 2 times, 3 times, 4 times, 5 times.

[0070] As an alternative embodiment, the interval time is 10 - 40 s, for example, it can be 10 s, 15 s, 20 s, 25 s, 30 s, 35 s, 40 s, etc.

[0071] As an alternative embodiment, the process parameters of high - voltage pulse treatment include:

[0072] The pulse frequency is 1 - 2 kHz, the pulse width is 10 - 50 μs, the flow rate is 10 - 20 L / h, the electric field strength is 10 - 50 kV / cm, and the pulse treatment time is 100 - 500 μs.

[0073] As an alternative embodiment, the pulse frequency is 1 - 2 kHz, for example, it can be 1 kHz, 1.2 kHz, 1.4 kHz, 1.5 kHz, 1.6 kHz, 1.8 kHz, 2 kHz, etc.

[0074] As an alternative embodiment, the pulse width is 10 - 50 μs, for example, it can be 10 μs, 12 μs, 14 μs, 15 μs, 16 μs, 18 μs, 20 μs, 22 μs, 24 μs, 26 μs, 28 μs, 30 μs, 32 μs, 34 μs, 35 μs, 36 μs, 38 μs, 40 μs, 42 μs, 44 μs, 45 μs, 46 μs, 48 μs, 50 μs, etc.

[0075] As an alternative embodiment, the flow rate is 10 - 20 L / h, for example, it can be 10 L / h, 11 L / h, 12 L / h, 13 L / h, 14 L / h, 15 L / h, 16 L / h, 17 L / h, 18 L / h, 19 L / h, 20 L / h, etc.

[0076] As an alternative embodiment, the electric field strength is 10 - 50 kV / cm, for example, it can be 10 kV / cm, 12 kV / cm, 14 kV / cm, 16 kV / cm, 18 kV / cm, 20 kV / cm, 22 kV / cm, 24 kV / cm, 26 kV / cm, 28 kV / cm, 30 kV / cm, 32 kV / cm, 34 kV / cm, 36 kV / cm, 38 kV / cm, 40 kV / cm, 42 kV / cm, 44 kV / cm, 46 kV / cm, 48 kV / cm, 50 kV / cm, etc.

[0077] As an alternative embodiment, the pulse treatment time is 100 - 500 μs, for example, it can be 100 μs, 120 μs, 140 μs, 160 μs, 180 μs, 200 μs, 220 μs, 240 μs, 260 μs, 280 μs, 300 μs, 320 μs, 340 μs, 360 μs, 380 μs, 400 μs, 420 μs, 440 μs, 460 μs, 480 μs, 500 μs, etc.

[0078] As an alternative embodiment, the process parameters of the fluidized bed spray drying process include:

[0079] The spray method is top spray, the inlet air temperature is 80 - 100 °C, the material temperature is 55 - 75 °C, the fan frequency is 20 - 50 Hz, the atomization pressure is 0.1 - 0.3 Mpa, and the liquid feed rate of the suspension is 20 - 80 g / min.

[0080] As an alternative embodiment, the spray method is top spray.

[0081] As an alternative embodiment, the inlet air temperature is 80 - 100 °C, for example, it can be 80 °C, 82 °C, 84 °C, 85 °C, 86 °C, 88 °C, 90 °C, 92 °C, 94 °C, 96 °C, 98 °C, 100 °C, etc.

[0082] As an alternative embodiment, the material temperature is 55 - 75 °C, for example, it can be 55 °C, 56 °C, 58 °C, 60 °C, 62 °C, 64 °C, 66 °C, 68 °C, 70 °C, 72 °C, 74 °C, 75 °C, etc.

[0083] As an alternative embodiment, the fan frequency is 20 - 50 Hz, for example, it can be 20 Hz, 22 Hz, 24 Hz, 25 Hz, 26 Hz, 28 Hz, 30 Hz, 32 Hz, 34 Hz, 35 Hz, 36 Hz, 38 Hz, 40 Hz, 42 Hz, 44 Hz, 45 Hz, 46 Hz, 48 Hz, 50 Hz, etc.

[0084] As an alternative embodiment, the atomization pressure is 0.1 - 0.3 Mpa, for example, it can be 0.1 Mpa, 0.12 Mpa, 0.14 Mpa, 0.15 Mpa, 0.16 Mpa, 0.18 Mpa, 0.2 Mpa, 0.22 Mpa, 0.24 Mpa, 0.25 Mpa, 0.26 Mpa, 0.28 Mpa, 0.3 Mpa, etc.

[0085] As an alternative embodiment, the liquid feed rate of the suspension is 20 - 80 g / min, for example, it can be 20 g / min, 25 g / min, 30 g / min, 35 g / min, 40 g / min, 45 g / min, 50 g / min, 55 g / min, 60 g / min, 65 g / min, 70 g / min, 75 g / min, 80 g / min, etc.

[0086] As an alternative embodiment, the carrier includes resistant dextrin.

[0087] In the present invention, resistant dextrin with good water solubility is used as a carrier, and pectin composite fiber microsphere powder prepared by fluidized bed spray drying is combined. The powder is spherical, with a small contact area between each other, further improving the dissolution rate and solubility in water, effectively avoiding caking phenomena, and more significantly improving the application efficiency. In addition, resistant dextrin belongs to low-molecular-weight water-soluble dietary fiber, has the effect of resisting digestive enzymes, can also accelerate gastrointestinal peristalsis, can maintain the stability of postprandial blood glucose, and can also help improve blood glucose levels in daily life.

[0088] As an optional implementation manner, the mass ratio of the carrier to the suspension is (3 - 4):1. For example, it can be 3:1, 3.1:1, 3.2:1, 3.3:1, 3.4:1, 3.5:1, 3.6:1, 3.7:1, 3.8:1, 3.9:1, 4:1, etc.

[0089] In a second aspect, the present invention provides a pectin composite fiber microsphere powder, which is prepared by the method for preparing pectin composite fiber microsphere powder based on high-voltage pulse combined with fluidized bed process as described in the first aspect.

[0090] In a third aspect, the present invention provides a pectin composite fiber gel, which is prepared by combining the pectin composite fiber microsphere powder as described in the second aspect with gastric acid.

[0091] In the present invention, the pectin composite fiber microsphere powder is soluble in water, rapidly forms a gel in the stomach when encountering gastric acid, and at the same time wraps carbohydrates such as starch and delays the absorption of the latter, playing a role in reducing the rapid increase of postprandial blood glucose.

[0092] In a fourth aspect, the present invention provides a preparation method of the pectin composite fiber gel as described in the third aspect, and the preparation method includes:

[0093] Dissolve the pectin composite fiber microsphere powder in water to obtain a microsphere powder solution;

[0094] Mix the microsphere powder solution with simulated gastric juice to form the composite fiber gel.

[0095] As an optional implementation manner, the mass ratio of the pectin composite fiber microsphere powder to water is 1:(100 - 200). For example, it can be 1:100, 1:120, 1:140, 1:150, 1:160, 1:180, 1:200, etc.

[0096] As an alternative embodiment, the mass ratio of the pectin composite fiber microsphere powder to the simulated gastric juice is 1:(40 - 60), for example, it can be 1:40, 1:42, 1:44, 1:45, 1:46, 1:48, 1:50, 1:52, 1:54, 1:55, 1:56, 1:58, 1:60, etc.

[0097] As an alternative embodiment, the simulated gastric juice is prepared according to the method in the Chinese Pharmacopoeia.

[0098] Among them, the time for forming the composite fiber gel ≤ 60 s, for example, it can be 60 s, 55 s, 50 s, 45 s, 40 s, 35 s, 30 s, 25 s, 20 s, 15 s, 10 s, etc.

[0099] Among them, the multiple for forming the composite fiber gel ≥ 90 times, for example, it can be 90 times, 91 times, 92 times, 93 times, 94 times, 95 times, 96 times, 97 times, 99 times, 100 times. (The multiple of the composite fiber gel refers to the weight parts of the formed gel.)

[0100] The present invention will be further described below through examples. Unless otherwise specified, the materials in the examples are prepared according to existing methods or directly purchased from the market.

[0101] Example 1

[0102] This example provides a preparation method of a composite fiber microsphere powder, and the preparation method includes the following steps:

[0103] S1. Ultrafine grinding:

[0104] Put 50 parts of low-fat pectin (esterification degree is 20%, molecular weight is 10000 g / mol), 20 parts of oat fiber, 20 parts of flaxseed fiber, and 10 parts of guar gum fiber into a pneumatic ultrafine grinder, with a grinding pressure of 2 Mpa, an air flow rate of 200 m / s, and a grinding time of 1 h. After grinding, a composite fiber powder is obtained; the particle size of the composite fiber powder is tested through a multi-layer sieve, and the particle size is 45 - 50 μm.

[0105] S2. High-speed dispersion and homogenization:

[0106] Add 100 parts of the composite fiber powder obtained in S1 to 2000 parts of purified water, and use a high-speed dispersion homogenizer for homogenization stirring, with a rotation speed of 15000 r / min, a single homogenization time of 1 min, and homogenization twice with an interval of 30 s to obtain suspension one.

[0107] S3. High-voltage pulse treatment:

[0108] Place the suspension I obtained in S2 in the processing chamber of a high-voltage pulse processing device for high-voltage pulse processing, maintaining the stable flow of the liquid. The pulse frequency is 1 kHz, the pulse width is 10 μs, the flow rate is 10 L / h, the electric field strength is 10 kV / cm, and the pulse processing time is 500 μs to obtain suspension II.

[0109] S4. Fluidized bed spray drying:

[0110] Put 300 parts of resistant dextrin into the fluidized bed, and then atomize and spray 100 parts of suspension II obtained in S3 onto the surface of the resistant dextrin. Spraying method: top spray, inlet air temperature 80°C, material temperature 60 ± 5°C, fan frequency 30 Hz, atomization pressure 0.2 Mpa, inlet liquid flow rate of suspension II 60 g / min. After drying, obtain the pectin composite fiber microsphere powder.

[0111] Example 2

[0112] This example provides a method for preparing composite fiber microsphere powder, and the preparation method includes the following steps:

[0113] S1. Ultrafine grinding:

[0114] Put 70 parts of low-fat pectin (esterification degree 26%, molecular weight 15000 g / mol), 5 parts of oat fiber, 20 parts of flaxseed fiber, and 5 parts of guar gum fiber into a pneumatic ultrafine grinder, with a grinding pressure of 6 Mpa, an air flow rate of 285 m / s, and a grinding time of 3 h to obtain composite fiber powder; the composite fiber powder is tested for particle size through a multi-layer sieve, and the particle size is 10 - 15 μm.

[0115] S2. High-speed dispersion and homogenization:

[0116] Add 100 parts of the composite fiber powder obtained in S1 to 1000 parts of purified water, and use a high-speed dispersion homogenizer for homogenization and stirring at a rotation speed of 20000 r / min, with a single homogenization time of 1 min, homogenize 3 times, with an interval of 30 s, to obtain suspension I.

[0117] S3. High-voltage pulse processing:

[0118] Place the suspension I obtained in S2 in the processing chamber of a high-voltage pulse processing device for high-voltage pulse processing, maintaining the stable flow of the liquid. The pulse frequency is 1 kHz, the pulse width is 10 μs, the flow rate is 10 L / h, the electric field strength is 10 kV / cm, and the pulse processing time is 500 μs to obtain suspension II.

[0119] S4. Fluidized bed spray drying:

[0120] Put 300 parts of resistant dextrin into a fluidized bed, and then atomize and spray 100 parts of suspension two obtained in S3 onto the surface of the resistant dextrin. Spraying method: top spraying, inlet air temperature 100 °C, material temperature 72.5 ± 2.5 °C, fan frequency 50 Hz, atomization pressure 0.2 Mpa, inlet liquid flow rate of suspension two 80 g / min. After drying, the pectin composite fiber microsphere powder is obtained.

[0121] Example 3

[0122] This example provides a method for preparing composite fiber microsphere powder, and the preparation method includes the following steps:

[0123] S1. Ultrafine grinding:

[0124] Put 70 parts of low-fat pectin (esterification degree 30%, molecular weight 18000 g / mol), 5 parts of oat fiber, 5 parts of flaxseed fiber, and 20 parts of guar gum fiber into a pneumatic ultrafine grinder. The grinding pressure is 4 Mpa, the air flow velocity is 240 m / s, and the grinding time is 2 h. After grinding, composite fiber powder is obtained; the particle size of the composite fiber powder is tested through a multi-layer sieve, and the particle size is 22 - 26 μm.

[0125] S2. High-speed dispersion and homogenization:

[0126] Add 100 parts of the composite fiber powder obtained in S1 to 1000 parts of purified water, and use a high-speed dispersion homogenizer for homogenization stirring. The rotation speed is 25000 r / min, the single homogenization time is 1 min, and homogenization is carried out 3 times at intervals of 30 s to obtain suspension one.

[0127] S3. High-voltage pulse treatment:

[0128] Place the suspension one obtained in S2 in the treatment chamber of a high-voltage pulse treatment device for high-voltage pulse treatment, maintain the stable flow of the liquid, the pulse frequency is 2 kHz, the pulse width is 50 μs, the flow rate is 20 L / h, the electric field strength is 50 kV / cm, and the pulse treatment time is 100 μs to obtain suspension two.

[0129] S4. Fluidized bed spray drying:

[0130] Put 400 parts of resistant dextrin into a fluidized bed, and then atomize and spray 100 parts of suspension two obtained in S3 onto the surface of the resistant dextrin. Spraying method: top spraying, inlet air temperature 80 °C, material temperature 67.5 ± 2.5 °C, fan frequency 20 Hz, atomization pressure 0.3 Mpa, inlet liquid flow rate of suspension two 20 g / min. After drying, the pectin composite fiber microsphere powder is obtained.

[0131] Example 4

[0132] This embodiment provides a method for preparing a composite fiber microsphere powder, which is different from Embodiment 2 only in that, in S1: the content of low-fat pectin is 40 parts, the content of oat fiber is 25 parts, the content of flaxseed fiber is 25 parts, and the content of guar bean fiber is 10 parts, and the other settings are consistent with Embodiment 2.

[0133] Example 5

[0134] This embodiment provides a method for preparing a composite fiber microsphere powder, which is different from Embodiment 2 only in that, in S1: the content of low-fat pectin is 80 parts, the content of oat fiber is 8 parts, the content of flaxseed fiber is 6 parts, and the content of guar bean fiber is 6 parts, and the other settings are consistent with Embodiment 2.

[0135] Example 6

[0136] This embodiment provides a method for preparing composite fiber microsphere powder, which is different from Embodiment 2 only in that, in S4: the resistant dextrin is replaced with maltodextrin of equal weight proportion, and other settings are consistent with Embodiment 1.

[0137] Comparative Example 1

[0138] This comparative example provides a method for preparing composite fiber microsphere powder, which is different from Example 2 only in that the ultrafine grinding process of S1 is not performed, and other settings are consistent with Example 2.

[0139] Comparative Example 2

[0140] This comparative example provides a method for preparing a composite fiber microsphere powder, which differs from Example 2 only in that, in S1: a roller mill is used for pulverization, and the powder is passed through a sieve to obtain a composite fiber powder with a particle size of 150-160 μm. Other settings are consistent with Example 2.

[0141] Comparative Example 3

[0142] This comparative example provides a method for preparing composite fiber microsphere powder, which is different from Example 2 only in that high-speed dispersing and homogenizing of S2 is not performed, and other settings are consistent with Example 2.

[0143] Comparative Example 4

[0144] This comparative example provides a method for preparing a composite fiber microsphere powder, which differs from Example 2 only in that, in S2: a magnetic stirrer is used for stirring, the stirring speed is 500 r / min, the stirring time is 2 h, and a suspension 1 is obtained, and the other settings are consistent with Example 2.

[0145] Comparative Example 5

[0146] This comparative example provides a method for preparing composite fiber microsphere powder, which is only different from Example 2 in that the high-voltage pulse process in S3 is not carried out, and other settings are the same as those in Example 2.

[0147] Comparative Example 6

[0148] This comparative example provides a method for preparing composite fiber microsphere powder, which is only different from Example 2 in that in S3: after pouring the first suspension obtained in S2 into a closed container, the container is placed in an ultrasonic device for ultrasonic treatment, the ultrasonic power is 600 W, and the time is 30 min, and other settings are the same as those in Example 2.

[0149] Comparative Example 7

[0150] This comparative example provides a method for preparing composite fiber microsphere powder, which is only different from Example 2 in that the low-fat pectin in S1 is replaced with high-fat pectin of equal weight, and the degree of esterification is 62%, and other settings are the same as those in Example 2.

[0151] Comparative Example 8

[0152] This comparative example provides a method for preparing composite fiber microsphere powder, which is only different from Example 2 in that in S4: the spray drying process is missing, 100 parts of the second suspension are placed in a constant temperature blast drying oven for high-temperature drying at 100 °C, sieved through a 40-mesh sieve and pulverized, and then mixed with 300 parts of resistant dextrin to obtain pectin composite fiber powder.

[0153] Comparative Example 9

[0154] This comparative example provides a method for preparing composite fiber microsphere powder, which is only different from Example 2 in that in S1: the crushing pressure is 8 Mpa, the air flow rate is 300 m / s, the crushing time is 30 min, and after crushing, the particle size of the material is tested through multiple sieves, and the particle size is 61 - 65 μm, and other settings are the same as those in Example 2.

[0155] Comparative Example 10

[0156] This comparative example provides a method for preparing composite fiber microsphere powder, which is only different from Example 2 in that in S1: the crushing pressure is 1 Mpa, the air flow rate is 180 m / s, the crushing time is 5 h, and after crushing, the particle size of the material is tested through multiple sieves, and the particle size is 90 - 96 μm, and other settings are the same as those in Example 2.

[0157] Comparative Example 11

[0158] This comparative example provides a method for preparing composite fiber microsphere powder, which is only different from Example 2 in that in S2: the rotation speed is 5000 r / min, and the homogenization time is 5 min, and other settings are the same as those in Example 2.

[0159] Comparative Example 12

[0160] This comparative example provides a method for preparing composite fiber microsphere powder. The difference from Example 2 is only that in S2: the rotation speed is 13,000 r / min, the homogenization time is 30 s, and other settings are the same as those in Example 2.

[0161] Comparative Example 13

[0162] This comparative example provides a method for preparing composite fiber microsphere powder. The difference from Example 2 is only that in S3: the pulse frequency is 0.5 kHz, the pulse width is 5 μs, the flow rate is 30 L / h, the electric field strength is 5 kV / cm, the pulse treatment time is 600 μs, and other settings are the same as those in Example 2.

[0163] Comparative Example 14

[0164] This comparative example provides a method for preparing composite fiber microsphere powder. The difference from Example 2 is only that in S3: the pulse frequency is 3 kHz, the pulse width is 60 μs, the flow rate is 5 L / h, the electric field strength is 60 kV / cm, the pulse treatment time is 60 μs, and other settings are the same as those in Example 2.

[0165] Comparative Example 15

[0166] This comparative example provides a method for preparing composite fiber microsphere powder. The difference from Example 2 is only that in S4: the inlet air temperature is 120°C, the material temperature is 80 ± 5°C, the fan frequency is 10 Hz, the atomization pressure is 0.05 Mpa, the flow rate of the suspension liquid inlet is 90 g / min, and other settings are the same as those in Example 2.

[0167] Comparative Example 16

[0168] This comparative example provides a method for preparing composite fiber microsphere powder. The difference from Example 2 is only that in S4: the inlet air temperature is 70°C, the material temperature is 50 ± 5°C, the fan frequency is 60 Hz, the atomization pressure is 0.5 Mpa, the flow rate of the suspension liquid inlet is 10 g / min, and other settings are the same as those in Example 1.

[0169] Test Example 1

[0170] Solubility Test

[0171] Test samples: the composite fiber microsphere powders provided in Examples 1 - 6 and the composite fiber microsphere powders provided in Comparative Examples 1 - 16.

[0172] Testing method: Take 1 g of the sample and add it to a beaker containing 200 mL of purified water at 60 °C. Place the beaker on a thermostatic magnetic stirrer, set the heating temperature to 60 °C, and the rotation speed to 300 r / min. Observe the dissolution situation and record the complete dissolution time.

[0173] The specific test results are shown in Table 1:

[0174] Table 1

[0175]

[0176] It can be seen from the test data in Table 1 that the pectin composite fiber microsphere powder prepared by the process of the present invention based on high-voltage pulse combined with fluidized bed shows no caking at all during dissolution, and the dissolution time is within 170 s; in Comparative Example 8, the fluidized bed process was not used, and caking occurred during dissolution, resulting in a longer dissolution time. This fully shows that the pectin composite fiber microsphere powder prepared by the present invention through fluidized bed spray drying can effectively reduce the caking phenomenon during pectin dissolution and has better solubility.

[0177] Test Example 2

[0178] In vitro simulated gastric gel test

[0179] Test samples: The composite fiber microsphere powders provided in Examples 1 to 6 and the composite fiber microsphere powders provided in Comparative Examples 1 to 16.

[0180] Testing method:

[0181] (a) Weigh 1 g of the sample and add it to a beaker containing 150 mL of purified water, and quickly stir until completely dissolved;

[0182] (b) Add 50 mL of pharmacopoeia gastric juice to the beaker, then add 150 mL of the dissolved sample, quickly stir for 5 - 10 s, then place it in a water bath at 37 ± 1 °C for 30 min, and then pour it through an 80-mesh sieve and drain for 10 min. Weigh the weight of the gel and the sieve, denoted as M2; the weight of the 80-mesh sieve, denoted as M1;

[0183] (c) Gel multiple calculation formula:

[0184] X = (M2 - M1) / 1;

[0185] Among them, X represents the gel multiple, dimensionless; M1 represents the weight of the dried sieve, in g; M2 represents the total weight of the gel and the sieve, in g;

[0186] Among them, the artificial gastric juice is prepared according to the Chinese Pharmacopoeia 2010 edition, and the method is as follows: For the artificial gastric juice, take 16.4 mL of dilute hydrochloric acid, add about 800 mL of water and 10 g of pepsin, shake well, and then dilute with water to 1000 mL.

[0187] The specific test results are shown in Table 2 as follows:

[0188] Table 2

[0189]

[0190] It can be seen from the test data in Table 2 that the gel multiple of the pectin composite fiber gel prepared by the present invention based on the high-voltage pulse combined with the fluidized bed process is ≥65 times; among them, Examples 1 to 3 are preferred solutions, and the gel multiple of the gel is ≥125 times. The gel multiples of Examples 1 to 3 are relatively high, indicating that the molecular chains of the composite fibers therein are opened to varying degrees, and self-assemble and wind to form a network gel through the action of positive and negative electric groups in gastric acid. The higher the gel multiple, the higher the degree of opening of the molecular chain. The gel multiple of Example 6 still remains at a relatively high level, indicating that maltodextrin and resistant dextrin have little influence on its gel performance as carriers. For Comparative Examples 1 to 4 and Comparative Examples 9 to 16, due to the use of process parameters outside the range, some molecular chains are opened, and partial gel is formed under the action of gastric acid, resulting in a lower gel multiple. The gel multiples of Comparative Examples 5 and 6 are the lowest because the high-voltage pulse electric field action is missing, the molecular chains are hardly opened, and a small amount of gel is formed under the action of gastric acid. No gel is formed in Comparative Example 7 because high-methoxyl pectin is used, which cannot form a gel with acid in a sugar-free environment, so no gel is formed.

[0191] This fully shows that the high-voltage pulse current formed by using pulsed electric fields in the present invention can pierce the molecular chains of pectin and composite fibers, promote the opening of their branched chains, and facilitate increasing the contact probability between molecular chains. After being dissolved in water again, it can quickly form a gel through self-assembly under gastric acid conditions.

[0192] Test Example 3

[0193] Postprandial blood glucose level test

[0194] Test samples: the composite fiber microsphere powders provided by Examples 1 to 6, and the composite fiber microsphere powders provided by Comparative Examples 1 to 16.

[0195] Test method:

[0196] For each group, 20 healthy adults are selected, 10 men and 10 women, aged 25 to 40 years old, with a BMI of 18.8 to 23.9 kg / m 2 , without a history of diabetes (or impaired glucose tolerance), without other metabolic diseases, digestive system diseases, endocrine system diseases, mental diseases, etc.; without a history of food allergy and intolerance to the test food, with a normal oral glucose tolerance test, regular diet, no gastrointestinal diseases and taking any medications recently, and passing the physical examination. The subjects are trained before the test and sign an informed consent form. After 22:00 on the night before the experiment starts, stop eating and drinking, and detect the blood glucose fluctuation after breakfast.

[0197] Control group: Consume 202 mL of water 15 minutes before breakfast, and then normally consume the reference food, white bread; Experimental group: Consume 2 g of the samples of each example and comparative example (2 g of the sample is dissolved in 200 mL of water) within 15 minutes before breakfast, and then normally consume the reference food, white bread; Using time as the abscissa and the blood glucose value at each time point - fasting blood glucose value as the ordinate, make a blood glucose response curve, calculate the area under the curve (IAUC) above the fasting blood glucose level, and the inhibition rate (%) = (IAUC of reference food - IAUC of example) / IAUC of reference food × 100%.

[0198] Among them, a Roche blood glucose meter is used for blood glucose testing, and the specific operation of measuring fingertip blood glucose is as follows:

[0199] (1) Collect fingertip blood, discard the first drop, and continuously measure fasting blood glucose twice at an interval of 5 minutes and record; (2) The control group consumes 202 mL of water; The experimental group consumes the samples of the examples and comparative examples (2 g of the sample is dissolved in 200 mL of water) (3) After 15 minutes, the control group and the experimental group consume white bread (calculated based on 50 g of carbohydrate intake) and complete the consumption within 5 minutes); Collect fingertip blood to detect blood glucose and record (15 minutes, 30 minutes, 45 minutes, 60 minutes, 90 minutes, 120 minutes after meals).

[0200] The specific test results are shown in Table 3 as follows:

[0201] Table 3

[0202]

[0203] It can be seen from the test data in Table 3 that after consuming the pectin composite fiber microsphere powder prepared by the high-pressure pulse combined fluidized bed process of the present invention, the blood glucose inhibition rate is more than 33%; Among them, Examples 1 to 3 are preferred solutions. After consuming the pectin composite fiber microsphere powder prepared in Practical Examples 1 to 3, the blood glucose inhibition rate can reach more than 62%.

[0204] The blood glucose inhibition rates of Examples 1 to 3 are relatively high. The reason is that while the pectin composite fiber solution forms a gel in the gastric juice, it wraps most of the chyme, delaying the absorption and conversion of carbohydrates in the gastrointestinal tract. Although the gel multiple of Example 6 is relatively high, the blood glucose inhibition rate is low. The reason is that maltodextrin belongs to carbohydrates and can cause blood glucose to rise, while resistant dextrin belongs to dietary fiber and does not cause blood glucose to rise in the body. Therefore, using resistant dextrin as a carrier can more effectively inhibit the rise of postprandial blood glucose. The blood glucose inhibition rates of Comparative Examples 1 to 16 are relatively low. The reason is that the gel multiple of their fiber solutions in gastric acid is relatively low, the amount of chyme wrapped is less, and the absorption degree of carbohydrates in the gastrointestinal tract is relatively high. The data of Comparative Examples 1 to 16 show that the higher the gel multiple, the more chyme is wrapped, and the higher the blood glucose inhibition rate.

[0205] This shows that the pectin composite fiber microsphere powder in the present invention dissolves in water, rapidly forms a gel when encountering gastric acid in the stomach, simultaneously wraps carbohydrates such as starch, and delays the absorption of the latter, playing a role in reducing the rapid rise of postprandial blood glucose.

[0206] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing pectin composite fiber microsphere powder based on high-voltage pulse combined with fluidized bed process, characterized in that: The method comprises the following steps: The composite fiber is ultrafinely ground to obtain composite fiber powder; wherein the composite fiber comprises pectin, oat fiber, flax seed fiber and guar fiber; the pressure of the ultrafine grinding is 2-6 MPa, and the air flow velocity is 200-285 m / s; the composite fiber comprises the following components by mass percentage: 50-70% pectin, 5-20% oat fiber, 5-20% flax seed fiber and 5-20% guar fiber; the esterification degree of the pectin is 20-40%; The composite fiber powder and water are dispersed and homogenized at high speed to obtain a suspension; wherein the speed of the high-speed dispersion and homogenization is 15000-25000 r / min; The suspension is subjected to high-voltage pulse treatment, and then the treated suspension is sprayed on the surface of the carrier through a fluidized bed spray drying process to obtain pectin composite fiber microsphere powder; wherein the process parameters of the high-voltage pulse treatment include: a pulse frequency of 1-2 kHz, a pulse width of 10-50 μs, a flow rate of 10-20 L / h, an electric field strength of 10-50 kV / cm, and a pulse treatment time of 100-500 μs; the process parameters of the fluidized bed spray drying process include: a spray mode of top spraying, an air inlet temperature of 80-100°C, a material temperature of 55-75°C, a fan frequency of 20-50 Hz, an atomization pressure of 0.1-0.3 Mpa, and a liquid feed flow rate of the suspension of 20-80 g / min; and the carrier is resistant dextrin or maltodextrin.

2. The method for preparing pectin composite fiber microsphere powder based on high pressure pulse combined with fluidized bed process according to claim 1, characterized in that: The molecular weight of the pectin is 10000-20000 g / mol.

3. The method for preparing pectin composite fiber microsphere powder based on high-voltage pulse combined with fluidized bed process according to claim 1, characterized in that: The ultrafine grinding is carried out in an airflow ultrafine grinding machine; And / or, the ultrafine grinding time is 1 to 3 hours; And / or, the particle size of the pulverized composite fiber powder is 10-50 μm.

4. The method for preparing pectin composite fiber microsphere powder based on high-voltage pulse combined with fluidized bed process according to claim 1, characterized in that: The mass ratio of the composite fiber powder to water is 1:(10-20); And / or, the process parameters of the high-speed dispersion and homogenization include: a single homogenization time of 30 s to 2 min, a homogenization number of 1 to 5 times, and an interval time of 10 to 40 s.

5. The method for preparing pectin composite fiber microsphere powder based on high-voltage pulse combined with fluidized bed process according to claim 1, characterized in that: The mass ratio of the carrier to the suspension is (3~4):

1.

6. A pectin composite fiber microsphere powder, characterized in that: The pectin composite fiber microsphere powder is prepared by the method for preparing pectin composite fiber microsphere powder based on high-voltage pulse combined with fluidized bed process according to any one of claims 1 to 5.

7. A pectin composite fiber gel, characterized in that: The pectin composite fiber gel is prepared by combining the pectin composite fiber microsphere powder according to claim 6 and simulated gastric fluid.

8. A method for preparing the pectin composite fiber gel according to claim 7, characterized in that: The preparation method comprises: Dissolving the pectin composite fiber microsphere powder in water to obtain a microsphere powder solution; The microsphere powder solution and simulated gastric fluid are mixed to form the composite fiber gel.

9. The method for preparing pectin composite fiber gel according to claim 8, characterized in that: The mass ratio of the pectin composite fiber microsphere powder to water is 1:(100-200); And / or, the mass ratio of the pectin composite fiber microsphere powder to the simulated gastric fluid is 1:(40-60); and / or, the time for forming the composite fiber gel is ≤ 60 s; And / or, the multiple of forming the composite fiber gel is ≥90 times.

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