Isomaltitol granules and preparation method thereof

Abstract

The invention provides an isomaltitol particle and a preparation method thereof, and belongs to the technical field of functional sugar. The preparation method comprises the following steps: spraying isomaltitol powder through a powder spray head; spraying out the isomaltitol concentrated solution through a liquid spray head for 10-20 seconds after the powder spray head sprays out the isomaltitol concentrated solution, and carrying out spray cooling collision granulation to obtain a granular material; and sieving the obtained particle material to obtain the isomaltitol particles. The isomaltitol particles obtained by the method are white solid spheres, are regular and have high stacking density, and the method provided by the invention can be used for forming at one time and controlling the size of the isomaltitol particles.

Description

Technical Field

[0001] The invention belongs to the technical field of functional sugars, and particularly relates to isomalt granules and a preparation method thereof. Background Art

[0002] Isomalt is a functional sugar alcohol composed of α-D-furanosyl-1,6-sorbitol and α-D-pyranosyl-1,1-mannitol. Its sweetness and calories are about half of sucrose, it is non-hygroscopic, and its melting point ranges from 145 to 150°C. It is a non-cariogenic sugar. In addition, isomalt does not cause an increase in blood sugar and is an ideal sweetener for diabetics. Isomalt is highly safe and is certified as a GRAS food by the US FDA. In my country, as a new resource food, its usage is limited to ≤100 grams / day. Isomalt is mainly used in candies and chocolates.

[0003] Chinese patent CN104028167A discloses a granulation process of isomalt, comprising the following steps: (1) adding activated carbon according to 2-5% of the mass of the dry matter of isomalt to an isomalt solution with a mass concentration of 30-50%, heating to 50-80°C, keeping the temperature for 30 minutes, filtering, and performing ion exchange with D301 anion resin and 001*7 cation resin to obtain a refined isomalt solution, wherein the dry matter of isomalt accounts for 1% of the dry matter of the solution. The mass of the isomalt is 95-100%, and the light transmittance of the solution is 95-100%; (2) the refined isomalt solution is concentrated to a mass concentration of 40-70% by a rotary evaporator; then the isomalt solution with a mass concentration of 40-70% is granulated by a spray drying tower, and the inlet air temperature is controlled at 120-170°C and the feed rate is 0.5L-2L / min during the spray drying process; (3) the isomalt obtained above is sieved to obtain powdered isomalt. In this method of spray granulation, the spray concentration of isomalt is low, and most of the products obtained are powders.

[0004] Chinese patent CN109608509A discloses a continuous preparation method of granular isomalt, comprising the following steps: using isomalt refined liquid as raw material, evaporating and concentrating to obtain isomalt concentrated liquid, transferring to a buffer for buffering, using a twin-screw extruder for extrusion granulation, first adding powdered isomalt as a seed to the extruder, then adding concentrated isomalt refined liquid, extruding and mixing the isomalt concentrated liquid and the isomalt powdered seed to discharge, drying the discharge by vacuum drying, and then crushing and sieving the dried discharge to obtain a granular isomalt finished product. This method prepares isomalt particles by extrusion granulation, which are large particles or small blocks after extrusion, and need to be crushed again; the crushed particles are irregular in shape, affecting the appearance quality of the product. Summary of the invention

[0005] In view of this, the present invention provides an isomalt granule and a preparation method thereof. The isomalt granules provided by the present invention are all white solid spheres, with regular particles and high packing density. The method provided by the present invention can form the granules in one step and can control the size of the isomalt granules.

[0006] The invention provides an isomalt granule. The isomalt granule is in the shape of a solid sphere, has a whiteness of ≥94, a moisture content of ≤3.0%, a bulk density of ≥0.75 g / mL, and an isomalt purity of ≥99%.

[0007] The present invention also provides a method for preparing isomalt granules, comprising the following steps:

[0008] 1) Spray the isomalt powder through the powder nozzle;

[0009] 2) 10 to 20 seconds after the powder nozzle is sprayed out in step 1), the isomalt concentrated solution is sprayed out through the liquid nozzle, and spray cooling collision granulation is performed to obtain a granular material; the mass concentration of the isomalt concentrated solution is 90 to 95%; the temperature of the isomalt concentrated solution is 115 to 125° C.;

[0010] 3) Screening the granular material obtained in step 2) to obtain isomalt granules.

[0011] Preferably, the particle size of the powder in step 1) is less than 100 mesh.

[0012] Preferably, in step 1), the number of powder spray heads is 4, and the direction is vertically downward.

[0013] Preferably, in step 2), the number of the liquid spray heads is 8, and the angle between the pipe connected to the liquid spray head and the vertical pipe is 150-170°.

[0014] Preferably, in step 1), the total mass of the powder sprayed out is 20-30% of the total mass of the liquid sprayed out.

[0015] Preferably, the cooling and drying temperature in step 2) is 35-45°C.

[0016] Preferably, the screening in step 3) is performed using a vibrating screen, and the mesh size of the vibrating screen is 100 meshes.

[0017] Preferably, the undersize obtained by screening in step 3) can be recycled to step 1) through a vacuum feeder.

[0018] Beneficial technical effects: The present invention sprays isomalt powder through a powder nozzle; after the powder nozzle sprays for 10 to 20 seconds, the isomalt concentrated liquid is sprayed through a liquid nozzle, spray-cooled and collided to obtain a granular material; the obtained granular material is sieved to obtain isomalt particles. The isomalt particles obtained by the present invention are all white solid spheres, with regular particles and high bulk density, and the method provided by the present invention can be formed in one step and can control the size of the isomalt particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a bird's-eye view of the nozzle location;

[0020] Figure 2 This is a front view of the nozzle direction. DETAILED DESCRIPTION

[0021] The invention provides an isomalt granule. The isomalt granule is in the shape of a solid sphere, has a whiteness of ≥94, a moisture content of ≤3.0%, a bulk density of ≥0.75 g / mL, and an isomalt purity of ≥99%.

[0022] The present invention also provides a method for preparing isomalt granules, comprising the following steps:

[0023] 1) Spray the isomalt powder through the powder nozzle;

[0024] 2) 10 to 20 seconds after the powder nozzle is sprayed out in step 1), the isomalt concentrated solution is sprayed out through the liquid nozzle, and spray cooling collision granulation is performed to obtain a granular material; the mass concentration of the isomalt concentrated solution is 90 to 95%; the temperature of the isomalt concentrated solution is 115 to 125° C.;

[0025] 3) Screening the granular material obtained in step 2) to obtain isomalt granules.

[0026] The invention sprays the isomalt powder through a powder spray head.

[0027] In the present invention, the particle size of the isomalt powder is less than 100 meshes, the purity is ≥ 99%, and it is a commercially available product well known to those skilled in the art; the number of the powder spray heads is preferably 4, and the direction is vertically downward. The isomalt powder of the present invention is sprayed from the powder spray head by a vacuum feeder.

[0028] After the powder spray head of the present invention sprays out for 10 to 20 seconds, the isomalt concentrated liquid is sprayed out through the liquid spray head, and spray cooling collision granulation is performed to obtain granular materials.

[0029] In the present invention, the time for the powder nozzle to first spray is preferably 15-18s; the pressure of the liquid nozzle is preferably 10-15Mpa; the mass concentration of the isomalt concentrate is preferably 90-95%, more preferably 93%; the temperature of the isomalt concentrate is preferably 115-125°C, more preferably 120°C. The pipeline for conveying the isomalt concentrate to the nozzle of the present invention is preferably insulated with a jacket.

[0030] The preparation method of the isomalt concentrated solution of the present invention is preferably to dissolve commercially available isomalt powder in water to obtain a maltose solution, heat and concentrate the solution to a desired concentration, and keep the solution warm. In the present invention, the mass concentration of the isomalt solution is preferably 50-70%, more preferably 55-60%.

[0031] In the present invention, the number of the liquid spray heads is preferably 8, and the angle between the pipe connected to the liquid spray head and the vertical pipe is preferably 150-170°. The present invention can achieve controllable liquid size by adjusting the spray head angle.

[0032] In the present invention, the temperature of the cooling collision granulation is preferably 35-45° C., more preferably 40-42° C. The present invention introduces cold air through an air induced system to make the temperature reach the cooling collision granulation temperature, and dries and hardens the obtained granular material.

[0033] In the present invention, the total mass of the powder sprayed out is 20-30% of the total mass of the liquid sprayed out.

[0034] The invention adopts a double spraying method, firstly spraying powder to fill the space with crystal seeds, and then spraying the isomalt concentrated liquid, the liquid contacts the powder crystal seeds in the process of falling, introducing cold wind, lowering the temperature to perform cooling collision granulation, and drying the obtained particles, so that the obtained isomalt particles are all white entities rather than transparent glass.

[0035] The liquid nozzles of the present invention are at the periphery, and all nozzles spray liquid inwardly; the powder nozzles are at the inner circle, and the powder is sprayed downwardly; most of the materials gather in the middle and collide with each other to shape the particles, so that the obtained isomalt particles are more regular.

[0036] The present invention sieves the obtained granular material to obtain isomalt granules.

[0037] In the present invention, the sieving is performed by using a vibrating screen, and the mesh number of the vibrating screen is preferably 100 meshes. The sieved material is isomalt granules, and the sieve-less material is isomalt powder. The isomalt granules enter the next process; the isomalt powder is returned to the nozzle by the vacuum feeder to achieve the reuse of the powder; the powder recovery rate is 90-95%.

[0038] The invention obtains isomalt products with different particle sizes and round and full particle shapes through a vibrating screen.

[0039] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0040] Unless otherwise defined, technical or scientific terms used in the present invention shall have the common meanings understood by one having ordinary skills in the field to which the present invention belongs.

[0041] Example 1

[0042] 1) Spray the isomalt powder through the powder nozzle;

[0043] 2) Add water to commercially available isomalt powder to dissolve into an isomalt solution with a mass concentration of 55%, heat the solution to concentrate it to a mass concentration of 90%, and keep it at 115°C to obtain an isomalt concentrate; spray the powder for 10 seconds, then use 8 liquid nozzles with an angle of 170° to spray the isomalt concentrate inward through a 10Mpa high-pressure nozzle, introduce cold air, and perform spray cooling and collision granulation at 35°C to obtain a granular material;

[0044] 3) The obtained granular material is passed through a 100-mesh vibrating screen, the sieve-surface material is isomalt granules, and the sieve-surface material is isomalt powder. The obtained powder is returned to the nozzle by a vacuum feeder to achieve the reuse of the powder; the powder recovery rate is 90.05%;

[0045] 4) The isomalt particles are white solid spheres with a whiteness of 95, a hardness of 5976 gf, a moisture content of 2.8%, a bulk density of 0.78 g / mL, and an isomalt purity of 99.7%.

[0046] Example 2

[0047] 1) Spray the isomalt powder through the powder nozzle;

[0048] 2) Add water to commercially available isomalt powder to dissolve into an isomalt solution with a mass concentration of 58%, heat and concentrate the solution to a mass concentration of 93%, and keep it at 120°C to obtain an isomalt concentrate; spray the powder for 15 seconds, then use 8 liquid nozzles with an angle of 160° to spray the isomalt concentrate inward through a 13MPa high-pressure nozzle, introduce cold air, and perform spray cooling and collision granulation at 40°C to obtain a granular material;

[0049] 3) The obtained granular material is passed through a 100-mesh vibrating screen, the sieve-surface material is isomalt granules, and the sieve-surface material is isomalt powder. The obtained powder is returned to the nozzle by a vacuum feeder to achieve the reuse of the powder; the powder recovery rate is 91.3%;

[0050] 4) The isomalt particles are white solid spheres with a whiteness of 96, a hardness of 6147 gf, a moisture content of 2.7%, a bulk density of 0.77 g / mL, and an isomalt purity of 99.4%.

[0051] Example 3

[0052] 1) Spray the isomalt powder through the powder nozzle;

[0053] 2) Add water to the isomalt powder to dissolve it into an isomalt solution with a mass concentration of 60%, heat the solution to concentrate it to a mass concentration of 95%, and keep it at 125°C to obtain an isomalt concentrated liquid; after the powder nozzle sprays the powder for 15 seconds, use 8 liquid nozzles with an angle of 150° to spray the isomalt concentrated liquid inward through a 15MPa high-pressure nozzle, introduce cold air, and perform spray cooling collision granulation at 45°C to obtain a granular material;

[0054] 3) The obtained granular material is passed through a 100-mesh vibrating screen, the sieve-surface material is isomalt granules, and the sieve-surface material is isomalt powder. The obtained powder is returned to the nozzle by a vacuum feeder to achieve the reuse of the powder; the powder recovery rate is 93.3%;

[0055] 4) The isomalt particles are white solid spheres with a whiteness of 96, a hardness of 6214 gf, a moisture content of 2.5%, a bulk density of 0.78 g / mL, and an isomalt purity of 99.6%.

[0056] Comparative Example 1:

[0057] Compared with Example 1, the isomalt liquid is concentrated to a mass concentration of 88%, the insulation temperature is 110° C., and the other conditions are exactly the same as those in Example 1; at this time, because the liquid mass concentration is too low, the sprayed liquid is a fluid, does not form drops, and cannot form particles.

[0058] Comparative Example 2:

[0059] Compared with Example 3, the isomalt liquid is concentrated to a mass concentration of 96%, and other conditions remain unchanged; at this time, the liquid falls quickly, and very little powder is combined with the droplets to form transparent or translucent particles.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. An isomalt granule, characterized in that: The isomalt particles are solid spherical, with whiteness ≥94, moisture content ≤3.0%, bulk density ≥0.75 g / mL, and the purity of isomalt ≥99%.

2. A method for preparing the isomalt granules according to claim 1, characterized in that: The following steps are involved: 1) Spray the isomalt powder through the powder nozzle; 2) 10 to 20 seconds after the powder nozzle is sprayed out in step 1), the isomalt concentrated solution is sprayed out through the liquid nozzle, and spray cooling collision granulation is performed to obtain a granular material; the mass concentration of the isomalt concentrated solution is 90 to 95%; the temperature of the isomalt concentrated solution is 115 to 125° C.; 3) Screening the granular material obtained in step 2) to obtain isomalt granules.

3. The preparation method according to claim 2, characterized in that The particle size of the powder in step 1) is less than 100 mesh.

4. The preparation method according to claim 2, characterized in that In the step 1), there are four powder spray nozzles, which are directed vertically downward.

5. The preparation method according to claim 2, characterized in that: In the step 2), the number of liquid spray heads is 8, and the angle between the pipe connected to the liquid spray head and the vertical pipe is 150-170°.

6. The preparation method according to claim 2, characterized in that: In the step 1), the total mass of the powder sprayed out is 20-30% of the total mass of the liquid sprayed out.

7. The preparation method according to claim 2, characterized in that: The temperature of the cooling collision granulation in step 2) is 35-45°C.

8. The preparation method according to claim 2, characterized in that: The sieving in step 3) is performed by using a vibrating screen, and the mesh number of the vibrating screen is 100 meshes.

9. The preparation method according to claim 2 or 8, characterized in that: The undersize obtained by sieving in step 3) can be recycled to step 1) through a vacuum feeder.

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