Method for preparing dietary fibers by taking sweet corn bracts as raw materials and anthocyanin dietary fiber solid beverage

Abstract

The invention provides a method for preparing dietary fibers by taking sweet corn bracts as raw materials and an anthocyanin dietary fiber solid beverage, and belongs to the technical field of deep processing of plants. The method specifically comprises the following steps: 1) pretreating sweet corn bracts; (2) preparing insoluble dietary fiber powder; 3) pre-activating at low temperature; 4) modifying by a microwave enzyme method; (5) performing steady-state embedding; 6) spray drying; and 7) compounding. The preparation method is simple, low in cost and easy to realize industrial production. Insoluble dietary fibers in sweet corn bracts are subjected to low-temperature pre-activation and microwave synergistic enzyme method modification, and the conversion rate of soluble and nanoscale high-activity dietary fibers is remarkably increased. The prepared anthocyanin dietary fiber solid beverage has the characteristics of high stability and high bioavailability of the proanthocyanidins, and meanwhile, the interaction of the modified dietary fibers and the proanthocyanidins is beneficial to synergic regulation of intestinal flora. According to the method, the economic value of the sweet corn bracts is improved, and high-value utilization of sweet corn resources is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of plant deep processing, and in particular to a method for preparing dietary fiber by taking sweet corn husks as raw materials and anthocyanin dietary fiber solid beverage. Background Art

[0002] In the process of fruit and vegetable processing, fruit and vegetable powder is an important processing form. Compared with the traditional "fruit crystals" blended with various flavors, fruit and vegetable powder has higher nutritional value and is more reasonable in supplementing various nutrients. Nowadays, with the continuous development and improvement of modern processing technology, in addition to traditional fruit pulp, the roots, stems, leaves, skins, cores and other parts of fruits and vegetables can also be recycled through the above means. In addition to increasing the utilization of raw materials, the use of traditional inedible parts can realize the high-value application of other effective ingredients in fruits and vegetables. Since fruit and vegetable powder solid beverages have many advantages such as easy to carry, convenient to drink and long shelf life, the market prospects are very broad.

[0003] At present, the production of solid beverages has been transformed and upgraded, from the traditional preparation of soy powder and malted milk to the preparation and production of solid beverage products with different flavors and functions that can meet the nutritional and health needs of different groups of people. Such as maca powder, red bean soup solid beverage, solid honey beverage, sweet potato powder, pomegranate peel ultrafine powder, bamboo leaf solid beverage, pomegranate fruit powder, etc. As we all know, in addition to traditional grains, fruits and vegetables also contain a lot of dietary fiber. The public's understanding of dietary fiber is mostly focused on insoluble dietary fiber, which is believed to occupy intestinal space and make people feel full, thereby reducing the total calorie intake. Soluble dietary fiber can reduce the cholesterol level in the blood and regulate postprandial blood sugar concentration. Dietary fiber can control the body's weight and prevent the occurrence of obesity. Today's intestinal bacteria research has also found that through the intake of dietary fiber, the body's various physiological functions can be regulated, the occurrence of intestinal diseases can be prevented and treated, and some tumor diseases can also be significantly improved. In order to continue to protect the intestines, solid beverage products containing dietary fiber continue to emerge on the market. Among the existing patent technologies, the Chinese patent (application number: 202110820550.8) discloses a dietary fiber probiotic solid beverage, which is composed of the following raw materials: compound probiotics, maltodextrin powder, dietary fiber, fruit and vegetable enzymes, whole milk powder and food additives; by adding a variety of probiotics to the solid beverage, a beneficial interaction occurs between the multiple probiotics, effectively increasing the diversity of the intestinal flora; by adding dietary fiber to the solid beverage, it is beneficial to play a good regulatory role on the probiotics in the human body; by adding fruit and vegetable enzymes to the solid beverage, it has the effects of regulating the human intestinal microecology, laxative, and weight loss; by adding whole milk powder and food additives to the solid beverage, not only the nutritional value of the solid beverage can be improved, but also the taste of the solid beverage can be effectively improved. A Chinese patent (application number: 201310575773.8) discloses a Eucheuma dietary fiber solid beverage and a preparation method thereof, comprising 40%-60% Eucheuma soluble dietary fiber, 10%-14% xylitol, 0.3%-0.7% citric acid, 0.1%-0.2% VC, 0.2%-0.5% calcium lactate, 0.01%-0.15% ferrous gluconate, 0.05%-0.15% CMC-Na, and the balance is maltodextrin. The prepared Eucheuma dietary fiber solid beverage is milky white in color, uniform in granular or powdery form, loose, without agglomeration, good in fluidity, sweet and slightly sour in taste, and free of unpleasant odor; it dissolves quickly after mixing, and there is no obvious stratification and sediment after standing for 2 minutes, and it has good sensory quality. A Chinese patent (application number: 201510501940.3) discloses a daily dietary fiber solid beverage and a preparation method thereof. Insoluble fiber powder, orange peel pectin, konjac flour, resistant dextrin and auxiliary materials are stirred and mixed, and then sterilized to obtain a daily dietary fiber solid beverage which has the beneficial effects of promoting intestinal peristalsis, facilitating the discharge of harmful substances in the digestive tract, and preventing constipation and colon cancer.Through analysis, it can be seen that the above-mentioned existing technologies still have problems such as unclear dietary fiber efficacy, high cost and unstable product quality.

[0004] Sweet corn husks, a waste resource after sweet corn processing, are rich in dietary fiber, starch, protein, polysaccharides, as well as amino acids, peptides, tannins, organic acids, alkaloids, glycosides, flavonoids, phenols, phytosterols, triterpenes, volatile oils, fats, saponins and other chemical components. However, they have not been effectively developed and utilized, resulting in a waste of biological resources. Summary of the invention

[0005] The purpose of the present invention is to provide a method for preparing dietary fiber using sweet corn husks as raw materials and anthocyanin dietary fiber solid beverage in view of the deficiencies in the prior art, so as to solve the problems of poor functional and structural characteristics of dietary fiber, unclear efficacy, high cost and unstable product quality in the prior art.

[0006] In order to solve the above technical problems, the technical solution proposed in the present invention is a method for preparing dietary fiber using sweet corn husks as raw materials and anthocyanin dietary fiber solid beverage, comprising the following process steps:

[0007] (1) Pretreatment of sweet corn husks: Recovering the sweet corn husks, washing, drying, crushing, and passing through an 80-100 mesh sieve to obtain sweet corn husk powder, the moisture content of which is less than 8%;

[0008] (2) Preparation of insoluble dietary fiber powder: The sweet corn husk powder obtained in step (1) is mixed with distilled water at a solid-liquid ratio of 1:30, and placed in a 60° C. constant temperature water bath, the pH of the mixture is adjusted to 6, medium temperature α-amylase is added, and the mixture is stirred at a constant temperature for 30-60 minutes, and then papain is added and stirred at a constant temperature for 30-60 minutes, and then the mixture is centrifuged to separate the solid and liquid, and the obtained precipitate is washed 1-3 times with a 75% ethanol solution and an aqueous solution to obtain sweet corn husk insoluble dietary fiber;

[0009] (3) low-temperature pre-activation: pre-freezing the insoluble dietary fiber of sweet corn husk obtained in step (2) at -20°C for 6-8h, and then ultra-low temperature freezing and crushing to obtain activated sweet corn husk insoluble dietary fiber powder;

[0010] (4) Microwave enzyme modification: the sweet corn husk insoluble dietary fiber activated powder obtained in step (3) is added to distilled water at a solid-liquid ratio of 1:15-1:30, mixed evenly, and then subjected to 800-1000W microwave treatment for 30-50 minutes, and then 0.5%-0.8% by weight of cellulase is added and treated at 60°C for 30-60 minutes, the mixture is centrifuged to collect the upper aqueous phase, and 4 times the volume of 95% ethanol is added to the aqueous phase while stirring, and then allowed to stand and centrifuged to collect the modified sweet corn husk dietary fiber;

[0011] (5) Stabilization embedding: dissolving the modified sweet corn husk dietary fiber obtained in step (4) in an appropriate amount of distilled water to obtain a sweet corn husk dietary fiber solution with a mass concentration of 10-20 mg / mL, and then adding a grape seed proanthocyanidin solution with a mass concentration of 20 mg / mL at a volume ratio of 5:1-10:1, stirring at 4°C in the dark for 30-60 minutes to obtain a sweet corn husk dietary fiber solution containing stable proanthocyanidins;

[0012] (6) spray drying: the sweet corn husk dietary fiber solution containing stable proanthocyanidins obtained in step (5) is vacuum concentrated and then spray dried, and the spray drying parameters are set as follows: feed mass concentration 20%, feed flow rate 20 mL / min, inlet temperature 150° C., to obtain proanthocyanidin dietary fiber spray-dried powder with a moisture content of less than 5.0%;

[0013] (7) Compounding: adding a certain amount of auxiliary materials to the proanthocyanidin dietary fiber spray-dried powder obtained in step (6) to make the mass percentage of the proanthocyanidin dietary fiber spray-dried powder 40%-60%, the mass percentage of sweet corn instant powder 30%-40%, the mass percentage of xanthan gum 1.0%-8.0%, the mass percentage of sodium carboxymethyl cellulose 0%-5%, the mass percentage of stevioside 1%-5%, the mass percentage of xylitol 0%-3%, the mass percentage of VC 0.1%-0.5% and the mass percentage of citric acid 0.2%-0.6%, stirring the compounded powder evenly, spray granulating and vacuum packaging to obtain a proanthocyanidin dietary fiber solid beverage.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The low-temperature pre-activation and microwave-assisted enzymatic modification technology was introduced, which can significantly improve the conversion of insoluble dietary fiber components in sweet corn husks into soluble and nano-scale highly active dietary fiber, giving the modified dietary fiber new physical and chemical properties such as large specific surface area, high porosity and chemical activity, which can fully release the nutrients carried into human digestion and absorption, and improve the bioavailability and bioactivity of nutrients. Compared with chickpea, soybean, corn, wheat bran and grape pomace dietary fiber, the water holding capacity, oil holding capacity and swelling capacity of the modified and activated sweet corn husk dietary fiber are significantly different, and are associated with particle size, porosity, charge density, specific surface area and spatial structure.

[0016] The results showed that the content of soluble dietary fiber and nano-level dietary fiber in sweet corn husks was greatly increased after ultra-low temperature freezing activation and microwave-assisted enzymatic modification. See Table 1 for details. Compared with the cellulase method and microwave-assisted enzymatic method, the combined treatment of ultra-low temperature freezing pre-activation and microwave-assisted enzymatic modification significantly improved the conversion rate of insoluble dietary fiber in sweet corn husks.

[0017] Table 1 The proportion of soluble and nano dietary fiber in the insoluble dietary fiber of sweet corn husk before and after activation modification

[0018] Components Initial content ratio After ultra-low temperature freezing activation After microwave-assisted enzymatic modification Sweet corn husk insoluble dietary fiber 100％ 60％-78％ 20％-35％ Sweet corn husk soluble dietary fiber 0 15％-25％ 60％-70％ Sweet corn husk nano dietary fiber 0 7％-15％ 5％-10％

[0019] 2. The modified dietary fiber is used to spray-dry the grape seed proanthocyanidins with a microencapsulation process to isolate them from the external environment and maximize the protection of their biological activity. The solid beverage is prepared for consumption. Since the activated sweet corn husk dietary fiber active polysaccharides form the best network space structure and form a synergistic effect with the proanthocyanidins through coupling reaction, the stability and bioavailability of anthocyanidins are improved, and the dietary fiber can also play a better role in the rehabilitation of patients with intestinal disorders, hyperlipidemia, and diabetes.

[0020] After testing, the modified dietary fiber and grape seed proanthocyanidin stabilization system was optimized by single factor test and orthogonal test. When the mass concentration of the modified dietary fiber from sweet corn husk was 12 mg / mL, it had the best stabilization effect on grape seed proanthocyanidin. The absorbance value at the maximum absorption wavelength was 0.76, and the auxiliary color rate was 28%; the absorbance value of the unstabilized anthocyanidin was 0.48, indicating that the modified dietary fiber and anthocyanidin had a good auxiliary color effect and a significant stabilization effect. After 30 days of sunlight treatment, the color preservation rate was 70.8%, which was 14.5% higher than that of the untreated grape seed proanthocyanidin solution; after heating at 100°C for 90 minutes, the color preservation rate was 68.2%, which was 17.1% higher than that of the untreated grape seed proanthocyanidin solution (Table 2).

[0021] Table 2 Stability of the modified sweet corn husk dietary fiber and grape seed proanthocyanidins stabilized system

[0022]

[0023] 3. The process of the present invention is simple, the cost is low, and it is easy to realize industrial production: the product has a good taste and a pure flavor, is rich in highly active dietary fiber, and has obvious efficacy.

[0024] 4. The process of the present invention can reduce the amount of waste resources in the sweet corn processing process, greatly improve the recycling rate of sweet corn husk resources, and has significant economic and environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A method for preparing dietary fiber using sweet corn husks as raw materials and a process flow chart of anthocyanin dietary fiber solid beverage DETAILED DESCRIPTION

[0026] The technical solution of the present invention is further described below in conjunction with specific embodiments.

[0027] Embodiment 1:

[0028] The sweet corn husks are recovered, washed, dried, crushed, and passed through a 100-mesh sieve to obtain sweet corn husk powder with a moisture content of about 7.5%; the sweet corn husk powder is mixed with distilled water at a solid-liquid ratio of 1:30, and placed in a 60°C constant temperature water bath, the pH of the mixture is adjusted to 6, a medium-temperature α-amylase with an enzyme activity of 1000 U / g is added, and the mixture is stirred at a constant temperature for 60 minutes, and then papain with an enzyme activity of 200,000 U / g is added and stirred at a constant temperature for 45 minutes, and then centrifuged to separate the solid and liquid of the mixture, and the obtained precipitate is washed twice with a 75% ethanol solution and an aqueous solution to obtain insoluble dietary fiber from sweet corn husks, which is pre-frozen at -20°C for 6 hours, and then ultra-low temperature frozen and crushed to obtain insoluble dietary fiber activated powder from sweet corn husks; the powder is added with distilled water at a solid-liquid ratio of 1:30, mixed evenly, and then subjected to a 1000W microwave treatment for 30 minutes, and then heated to room temperature. A 0.5% by mass percentage of cellulase was added and the mixture was treated at a constant temperature of 60°C for 30 minutes. The upper aqueous phase was collected by centrifugation, and 4 times the volume of 95% ethanol was added to the aqueous phase while stirring. After standing for 24 hours, the modified sweet corn husk dietary fiber was collected by centrifugation and dissolved in an appropriate amount of distilled water to obtain a sweet corn husk dietary fiber solution with a mass concentration of 15 mg / mL. A grape seed proanthocyanidin solution with a mass concentration of 20 mg / mL was added according to a volume ratio of 10:1, and the mixture was stirred at a low temperature of 4°C and away from light for 30 minutes to obtain a sweet corn husk dietary fiber solution containing stable proanthocyanidins. After vacuum concentration, the mixture was spray-dried, and the spray-drying parameters were set as follows: feed mass concentration of 20%, feed flow rate of 20 mL / min, and inlet temperature of 150°C to obtain proanthocyanidin dietary fiber spray-dried powder, so that the moisture content was less than 5.0%.

[0029] A certain amount of auxiliary materials are added to the obtained proanthocyanidin dietary fiber spray-dried powder so that the mass percentage of the proanthocyanidin dietary fiber spray-dried powder is 48%, the mass percentage of sweet corn instant powder is 40%, the mass percentage of xanthan gum is 5%, the mass percentage of sodium carboxymethyl cellulose is 2.5%, the mass percentage of stevioside is 3%, the mass percentage of xylitol is 1%, the mass percentage of VC is 0.2% and the mass percentage of citric acid is 0.3%, the composite powder is stirred evenly, and the proanthocyanidin dietary fiber solid beverage is prepared through spray granulation and vacuum packaging.

[0030] Embodiment 2:

[0031] The sweet corn husks are recovered, washed, dried, crushed, and passed through an 80-mesh sieve to obtain sweet corn husk powder with a moisture content of about 6.8%; the sweet corn husk powder is mixed with distilled water at a solid-liquid ratio of 1:30, and placed in a 60°C constant temperature water bath, the pH of the mixture is adjusted to 6, a medium-temperature α-amylase with an enzyme activity of 1000 U / g is added, and the mixture is stirred at a constant temperature for 30 minutes, and then papain with an enzyme activity of 400,000 U / g is added and stirred at a constant temperature for 30 minutes, and then centrifuged to separate the solid and liquid of the mixture, and the obtained precipitate is washed 3 times with a 75% ethanol solution and an aqueous solution to obtain insoluble dietary fiber of sweet corn husks, which is pre-frozen at -20°C for 8 hours, and then ultra-low temperature frozen and crushed to obtain insoluble dietary fiber activated powder of sweet corn husks; the powder is added with distilled water at a solid-liquid ratio of 1:15, mixed evenly, and then subjected to 800W microwave treatment for 50 minutes, and then added The method comprises the following steps: treating the mixture with a cellulase having a mass percentage of 0.6% at a constant temperature of 60°C for 60 minutes, collecting the upper aqueous phase of the mixture by centrifugation, adding 4 times the volume of 95% ethanol to the aqueous phase while stirring, and standing the mixture for 24 hours. The modified sweet corn husk dietary fiber is collected by centrifugation and dissolved in an appropriate amount of distilled water to obtain a sweet corn husk dietary fiber solution with a mass concentration of 20 mg / mL, adding a grape seed proanthocyanidin solution with a mass concentration of 20 mg / mL according to a volume ratio of 8:1, stirring the mixture at a low temperature of 4°C and away from light for 60 minutes to obtain a sweet corn husk dietary fiber solution containing stable proanthocyanidins, and spray drying the mixture after vacuum concentration. The spray drying parameters are set as follows: a feed mass concentration of 20%, a feed flow rate of 20 mL / min, and an inlet temperature of 150°C to obtain a proanthocyanidin dietary fiber spray-dried powder with a moisture content of less than 5.0%.

[0032] A certain amount of auxiliary materials is added to the obtained proanthocyanidin dietary fiber spray-dried powder so that the mass percentage of the proanthocyanidin dietary fiber spray-dried powder is 55%, the mass percentage of sweet corn instant powder is 35%, the mass percentage of xanthan gum is 4%, the mass percentage of sodium carboxymethyl cellulose is 2%, the mass percentage of stevioside is 2.5%, the mass percentage of xylitol is 1%, the mass percentage of VC is 0.3% and the mass percentage of citric acid is 0.2%, the composite powder is stirred evenly, and the proanthocyanidin dietary fiber solid beverage is prepared through spray granulation and vacuum packaging.

[0033] Embodiment 3:

[0034] The sweet corn husks are recovered, washed, dried, crushed, and passed through a 100-mesh sieve to obtain sweet corn husk powder with a moisture content of about 7.1%; the sweet corn husk powder is mixed with distilled water at a solid-liquid ratio of 1:30, and placed in a 60°C constant temperature water bath, the pH of the mixture is adjusted to 6, a medium-temperature α-amylase with an enzyme activity of 1000 U / g is added, and the mixture is stirred at a constant temperature for 45 minutes, and then papain with an enzyme activity of 400,000 U / g is added and stirred at a constant temperature for 45 minutes, and then centrifuged to separate the solid and liquid of the mixture, and the obtained precipitate is washed once with a 75% ethanol solution and an aqueous solution to obtain insoluble dietary fiber from sweet corn husks, which is pre-frozen at -20°C for 8 hours, and then ultra-low temperature frozen and crushed to obtain insoluble dietary fiber activated powder from sweet corn husks; the powder is added with distilled water at a solid-liquid ratio of 1:20, mixed evenly, and then subjected to a 900W microwave treatment for 40 minutes, and then heated to room temperature. A 0.8% by mass percentage of cellulase was added and the mixture was treated at a constant temperature of 60°C for 45 minutes. The upper aqueous phase was collected by centrifugation, and 4 times the volume of 95% ethanol was added to the aqueous phase while stirring. After standing for 24 hours, the modified sweet corn husk dietary fiber was collected by centrifugation and dissolved in an appropriate amount of distilled water to obtain a sweet corn husk dietary fiber solution with a mass concentration of 10 mg / mL. A grape seed proanthocyanidin solution with a mass concentration of 20 mg / mL was added according to a volume ratio of 5:1, and the mixture was stirred at a low temperature of 4°C and away from light for 45 minutes to obtain a sweet corn husk dietary fiber solution containing stable proanthocyanidins. After vacuum concentration, the mixture was spray-dried, and the spray-drying parameters were set as follows: feed mass concentration of 20%, feed flow rate of 20 mL / min, inlet temperature of 150°C, to obtain proanthocyanidin dietary fiber spray-dried powder, and the moisture content was less than 5.0%.

[0035] A certain amount of auxiliary materials is added to the obtained proanthocyanidin dietary fiber spray-dried powder so that the mass percentage of the proanthocyanidin dietary fiber spray-dried powder is 55%, the mass percentage of sweet corn instant powder is 30%, the mass percentage of xanthan gum is 4%, the mass percentage of sodium carboxymethyl cellulose is 4%, the mass percentage of stevioside is 5%, the mass percentage of xylitol is 1.2%, the mass percentage of VC is 0.5% and the mass percentage of citric acid is 0.3%, the composite powder is stirred evenly, and the proanthocyanidin dietary fiber solid beverage is prepared through spray granulation and vacuum packaging.

Claims

1. A method for preparing dietary fiber using sweet corn husks as raw materials and anthocyanin dietary fiber solid beverage, characterized in that The process steps include: (1) Pretreatment of sweet corn husks: Recovering the sweet corn husks, washing, drying, crushing, and passing through an 80-100 mesh sieve to obtain sweet corn husk powder, the moisture content of which is less than 8%; (2) Preparation of insoluble dietary fiber powder: The sweet corn husk powder obtained in step (1) is mixed with distilled water at a solid-liquid ratio of 1:30, and placed in a 60° C. constant temperature water bath, the pH of the mixture is adjusted to 6, medium temperature α-amylase is added, and the mixture is stirred at a constant temperature for 30-60 minutes, and then papain is added and stirred at a constant temperature for 30-60 minutes, and then the mixture is centrifuged to separate the solid and liquid, and the obtained precipitate is washed 1-3 times with a 75% ethanol solution and an aqueous solution to obtain sweet corn husk insoluble dietary fiber; (3) low-temperature pre-activation: pre-freezing the insoluble dietary fiber of sweet corn husk obtained in step (2) at -20°C for 6-8h, and then ultra-low temperature freezing and crushing to obtain activated sweet corn husk insoluble dietary fiber powder; (4) Microwave enzyme modification: the sweet corn husk insoluble dietary fiber activated powder obtained in step (3) is added to distilled water at a solid-liquid ratio of 1:15-1:30, mixed evenly, and then subjected to 800-1000W microwave treatment for 30-50 minutes, and then 0.5%-0.8% by weight of cellulase is added and treated at 60°C for 30-60 minutes, the mixture is centrifuged to collect the upper aqueous phase, and 4 times the volume of 95% ethanol is added to the aqueous phase while stirring, and then allowed to stand and centrifuged to collect the modified sweet corn husk dietary fiber; (5) Stabilization embedding: dissolving the modified sweet corn husk dietary fiber obtained in step (4) in an appropriate amount of distilled water to obtain a sweet corn husk dietary fiber solution with a mass concentration of 10-20 mg / mL, and then adding a grape seed proanthocyanidin solution with a mass concentration of 20 mg / mL at a volume ratio of 5:1-10:1, stirring at 4°C in the dark for 30-60 minutes to obtain a sweet corn husk dietary fiber solution containing stable proanthocyanidins; (6) spray drying: the sweet corn husk dietary fiber solution containing stable proanthocyanidins obtained in step (5) is vacuum concentrated and then spray dried, and the spray drying parameters are set as follows: feed mass concentration 20%, feed flow rate 20 mL / min, inlet temperature 150° C., to obtain proanthocyanidin dietary fiber spray-dried powder with a moisture content of less than 5.0%; (7) Compounding: adding a certain amount of auxiliary materials to the proanthocyanidin dietary fiber spray-dried powder obtained in step (6) to make the mass percentage of the proanthocyanidin dietary fiber spray-dried powder 40%-60%, the mass percentage of sweet corn instant powder 30%-40%, the mass percentage of xanthan gum 1.0%-8.0%, the mass percentage of sodium carboxymethyl cellulose 0%-5%, the mass percentage of stevioside 1%-5%, the mass percentage of xylitol 0%-3%, the mass percentage of VC 0.1%-0.5% and the mass percentage of citric acid 0.2%-0.6%, stirring the compounded powder evenly, spray granulating and vacuum packaging to obtain a proanthocyanidin dietary fiber solid beverage.

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