CN113057225A - Processing method of broken walnut particles in granular walnut milk beverage - Google Patents
Processing method of broken walnut particles in granular walnut milk beverage Download PDFInfo
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23C—DAIRY PRODUCTS, e.g. MILK, BUTTER OR CHEESE; MILK OR CHEESE SUBSTITUTES; MAKING THEREOF
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- A23C11/02—Milk substitutes, e.g. coffee whitener compositions containing at least one non-milk component as source of fats or proteins
- A23C11/10—Milk substitutes, e.g. coffee whitener compositions containing at least one non-milk component as source of fats or proteins containing or not lactose but no other milk components as source of fats, carbohydrates or proteins
- A23C11/103—Milk substitutes, e.g. coffee whitener compositions containing at least one non-milk component as source of fats or proteins containing or not lactose but no other milk components as source of fats, carbohydrates or proteins containing only proteins from pulses, oilseeds or nuts, e.g. nut milk
Abstract
In order to solve the problems of nutrient component loss and taste improvement caused by the existing walnut milk processing technology, the invention discloses a processing method of walnut granules in a granular walnut milk beverage, which sequentially comprises the following steps: (1) drying at low temperature; (2) crushing (3) removing kernel skin by an electrostatic method (4) and freeze-drying; (5) crushing; 6) preparing; (7) and (6) packaging. The processing method of the walnut granules in the granular walnut milk beverage disclosed by the invention removes the walnut kernel peel by adopting a method combining low-temperature drying and crushing with electrostatic adsorption, can ensure the peeling effect, also protects the antioxidant components in the walnut kernel from being damaged, simultaneously does not need to rinse after peeling to remove residual alkali liquor, saves water and wastewater treatment, enables the walnut milk granules to be smaller than 300 meshes, can improve the absorption rate of protein and amino acid, and adds the walnut granules crushed to a certain particle size in the walnut milk, so that the taste of the walnut milk beverage is improved on the basis of ensuring the quality of the walnut milk, and the method has popularization value.
Description
Technical Field
The invention relates to a deep processing technology of walnuts, in particular to a processing method of broken walnut grains in a granular walnut milk beverage.
Background
Walnut, also called walnut and walnut, belongs to the family of juglandaceae, the genus walnut, and is listed as four dry fruits in the world together with almond, cashew nut and hazelnut. Also contains abundant essential amino acids, linolenic acid, oleic acid and various trace elements, and has effects of invigorating stomach, replenishing blood, moistening lung, and tranquilizing. The walnut kernel is mainly developed in China at present, and products of the walnut kernel comprise walnut powder, walnut milk, walnut cakes, collagen walnuts, walnut oil series products and the like. The walnut kernel mainly contains trace elements such as manganese, chromium, selenium and zinc and trace functional ingredients such as nervonic acid, gadoleic acid, EPA, DHA, squalene, melatonin, flavone and carotene, and also contains more antioxidant active ingredients such as juglone, hyperoside, avicularin, juglanin, kaempferol, quercetin, isoquercitin and gallic acid.
The walnut beverages of the prior art have certain limitations. Firstly, most walnut beverages on the market have relatively single mouthfeel, and are mostly pure liquid emulsions. Secondly, manufacturers can pursue composite and nutrition-enhanced beverages, but only other nutritional agents or ingredients are added, so that the retention and protection of the nutritional ingredients of the walnuts are less, and in addition, some flavoring agents are added for adjusting the taste of the walnut beverages, so that audiences have certain limitation. Therefore, the improvement of the processing technology of the walnut beverage is of great importance to the nutritional ingredients and stability of the walnut.
Patent application CN104738185B discloses a novel walnut milk beverage and a preparation method thereof, which comprises the following ingredients in percentage by weight: 3.9 to 6.2 percent of white granulated sugar, 3.0 to 4.8 percent of walnut kernel, 0.10 to 0.15 percent of sucrose fatty acid ester, 0.087 to 0.137 percent of glycerin monostearate, 0.072 to 0.114 percent of flavoring essence, 0.052 to 0.082 percent of sodium caseinate, 0.043 to 0.068 percent of sodium bicarbonate, 0.03 to 0.048 percent of xanthan gum, 0.017 to 0.027 percent of D-sodium erythorbate, 0.013 to 0.021 percent of potassium sulfacetamide, 0.013 to 0.021 percent of sodium hexametaphosphate, 0.004 to 0.007 percent of sodium tripolyphosphate and the balance of RO water. The preparation method of the novel walnut milk beverage comprises the following steps: 1) weighing all the ingredients; 2) pre-treating walnut kernels: peeling semen Juglandis, grinding into slurry, and pre-homogenizing or emulsifying and shearing to obtain processed semen Juglandis as semen Juglandis slurry; 3) blending: blending the walnut milk and other ingredients to obtain a walnut milk semi-finished product; 4) first homogenizing: homogenizing the semi-finished product of walnut milk for the first time at 75-80 deg.C and 35-40MPa to obtain homogenized walnut milk for the first time; 5) and (3) second homogenization: carrying out secondary homogenization on the primary homogenized walnut milk at the temperature of 75-80 ℃ and the pressure of 35-40MPa to obtain secondary homogenized walnut milk; 6) filling, sealing and sterilizing the secondary homogenized walnut milk to obtain a novel walnut milk beverage; in step 2): boiling walnut kernel with NaHCO3 solution, peeling, grinding into slurry in NaHCO3 solution, pre-homogenizing or emulsifying and shearing to obtain treated walnut kernel; in the step 2), during grinding, the grinding temperature is 80-85 ℃, and the grinding is carried out until the fineness is 13-17 mu m; in the step 2), the pre-homogenization is carried out at the temperature of 75-80 ℃ and the pressure of 35-40 MPa. In the application, the walnut kernels and the obtained walnut milk are treated by using high temperature for many times, and the antioxidant active ingredients in the walnut kernels are sensitive to temperature and easy to oxidize, so that the taste and the nutritional value of the walnut milk are adversely affected by long-time high-temperature treatment.
Therefore, the processing method of walnut granules in the granular walnut milk beverage is needed to be provided, the granular walnut milk beverage is added with the walnut granules, the material composition is simple, the proportion is reasonable, the taste and the nutritional value of the walnut milk can be improved, and the granular walnut milk beverage is not added with a flavoring agent and other additives and can be suitable for wider consumer groups; the preparation method is scientific in process, and the antioxidant ingredients in the walnut milk are protected.
Disclosure of Invention
Aiming at the problem that the taste and the nutritive value of walnut milk in the prior art need to be improved, in order to solve the technical problems, the invention adopts the following technical scheme:
a processing method of walnut granules in a granular walnut milk beverage comprises the following steps in sequence:
(1) and (3) low-temperature drying: drying the walnut kernels with the shells removed at the temperature of not higher than 60 ℃ for 4-6 hours;
(2) crushing: crushing the dried walnut kernels to obtain coarse walnut kernel particles;
(3) removing kernels and peels by an electrostatic method: adding the coarse walnut particles obtained in the step (2) into a static torch for peeling, and sucking the kernel skin with poor conductivity by using a roller until the kernel skin is brushed off by a brush; the kernels with good conductivity fall in advance due to the charge transferred to the roller, and the peeled coarse walnut kernel particles are collected;
(4) and (3) freeze drying: pre-freezing in a refrigerator at the temperature of minus 80 ℃, and then carrying out vacuum freeze drying until the water content is lower than 8%;
(5) crushing: crushing the freeze-dried walnut kernels in a crusher, putting the coarse powder in an ultra-micro crushing vibration mill, crushing for 1min at low temperature and under the nitrogen condition to obtain walnut particles, taking out 5% of the walnut particles for feeding in the next step, and continuously crushing the rest of the walnut particles for 5min to obtain walnut micro powder for preparing walnut milk;
(6) preparation: adding 1.5 times of water into the walnut micro powder obtained in the step (5), and grinding the walnut micro powder into pulp by using a colloid mill; stirring and pulping at 40-70 ℃ for 0.5-2 hours, adding 1.5-4 times of water, and performing colloid mill pulping; stirring and pulping at the temperature of 40-70 ℃ for 0.5-2 h to obtain walnut pulp; adding a proper amount of tragacanth into the mixture, continuing to grind the mixture into thick liquid for 0.5 to 2 hours by using a colloid mill, adding a proper amount of sodium carboxymethylcellulose and sodium chloride, fully stirring, adding 3 to 8 times of purified water for complementing, and adjusting the pH to 7 to 7.5; continuing the colloid mill grinding treatment to ensure that the particle size of the walnut milk primary pulp is less than 300 meshes; adding the walnut granules into the peach milk raw pulp according to the material-liquid ratio, and introducing into a homogenizer for homogenizing treatment to obtain walnut milk added with the walnut granules;
(7) packaging: filling the walnut milk added with the walnut granules, sterilizing in a sterilization kettle at the temperature of 121-.
Preferably, the drying temperature in the processing step (1) is 40-50 ℃.
Preferably, the water content in the processing step (4) is 5%.
Preferably, the ratio of the materials to the liquid in the processing step (6) is 1:20 to 1-50.
Preferably, the additive in the processing step (6) is: the dosage of sodium chloride is 0.05 percent, the dosage of tragacanth is 0.5 to 1 percent, and the dosage of sodium carboxymethylcellulose is 0.1 to 1 percent.
Preferably, the particle size of the walnut particles in the processing step (5) is not less than 60 meshes.
The invention has the following beneficial effects: firstly, the invention does not add a flavoring agent and adds walnut kernel particles, does not contain easily-allergic components such as peanut, milk and the like, can be suitable for most consumers to drink, ensures the original taste and flavor of the walnut to the maximum extent, and provides a good choice for different consumer groups to use the walnut beverage. Secondly, the invention adopts a method of combining low-temperature drying and crushing with electrostatic adsorption to remove the walnut kernel skin, which can ensure the peeling effect and can not cause the protein, grease and other nutrient components in the walnut to generate chemical reaction to influence the nutrient value of the walnut, meanwhile, the invention does not need to rinse after peeling to remove the residual alkali liquor, thereby saving the rinsing water and reducing the wastewater treatment burden, and moreover, the invention protects the antioxidant components in the walnut by low temperature and nitrogen filling during the ultramicro crushing, and keeps the nutrient components in the walnut as much as possible.
Detailed Description
As mentioned above, the present invention is directed to a method for processing walnut granules in a granular walnut milk beverage, which will be described in detail with reference to the following examples.
It is specifically noted that similar alternatives and modifications will be apparent to those skilled in the art, which are also intended to be included within the present invention. It will be apparent to those skilled in the art that the techniques of the present invention may be implemented and applied by modifying or appropriately combining the methods and applications described herein without departing from the spirit, scope, and content of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. The percentages of the invention are mass percentages.
If the specific conditions are not indicated, the method is carried out according to the conventional conditions or the conditions suggested by manufacturers, and the used raw material medicines or auxiliary materials and the used reagents or instruments are the conventional products which can be obtained commercially.
Example 1:
walnut granules were prepared according to the following method:
(1) and (3) low-temperature drying: drying the walnut kernels with the shells removed, wherein the drying temperature is 40 ℃ for 6 hours;
(2) crushing: crushing the dried walnut kernels to obtain coarse walnut kernel particles;
(3) removing kernels and peels by an electrostatic method: adding the coarse walnut particles obtained in the step (2) into a static torch for peeling, and sucking the kernel skin with poor conductivity by using a roller until the kernel skin is brushed off by a brush; the kernels with good conductivity fall in advance due to the charge transferred to the roller, and the peeled crushed particles of the coarse walnut kernels are collected.
(4) And (3) freeze drying: pre-freezing in a refrigerator at the temperature of minus 80 ℃, and then carrying out vacuum freeze drying until the water content is 6%;
(5) crushing: pulverizing the freeze-dried walnut kernel in a pulverizer, placing the coarse powder in an ultramicro pulverizing vibration mill, pulverizing for 1min at low temperature and under nitrogen to obtain 60-mesh walnut granules, taking out 5% for feeding in the next step, and pulverizing the rest for 5min to obtain walnut micropowder for preparing walnut milk.
(6) Preparation: adding 1.5 times of water into the walnut micro powder obtained in the step (5), and grinding the walnut micro powder into pulp by using a colloid mill; stirring and grinding the mixture at the temperature of 40 ℃ for 2 hours, adding 1.5 times of water, and grinding the mixture by a colloid mill; stirring and grinding the walnut pulp at the temperature of 40 ℃ for 2 hours to obtain walnut pulp; adding 0.5% of tragacanth, grinding with colloid mill for 2 hr, adding 1% of sodium carboxymethylcellulose and 0.05% of sodium chloride, stirring, adding 8 times of purified water, and adjusting pH to 7; continuing the colloid mill grinding treatment to ensure that the particle size of the walnut milk primary pulp is less than 300 meshes; adding 2% of walnut granules into the peach milk raw pulp, and introducing into a homogenizer for homogenization treatment to obtain walnut milk added with the walnut granules;
(7) packaging: filling the walnut milk added with the walnut granules, sterilizing in a sterilization kettle at 123 ℃ for 20 minutes, cooling, spraying the code, and packaging.
Example 2
The walnut milk is prepared by the following method:
(1) drying: drying the walnut kernels with the shells removed at the temperature of 50 ℃ for 4 hours;
(2) crushing: crushing the dried walnut kernels to obtain coarse walnut kernel particles;
(3) peeling walnut kernels: adding the coarse walnut particles obtained in the step (2) into a static torch for peeling, and sucking the kernel skin with poor conductivity by using a roller until the kernel skin is brushed off by a brush; the kernels with good conductivity fall in advance due to the charge transferred to the roller, and the peeled crushed particles of the coarse walnut kernels are collected.
(4) And (3) freeze drying: pre-freezing in a refrigerator at the temperature of minus 80 ℃, and then carrying out vacuum freeze drying until the water content is 5%;
(5) crushing: pulverizing the freeze-dried walnut kernel in a pulverizer, placing the coarse powder in an ultramicro pulverizing vibration mill, pulverizing for 1min at low temperature and under nitrogen to obtain 80-mesh walnut granules, taking out 5% for feeding in the next step, and pulverizing the rest for 5min to obtain walnut micropowder for preparing walnut milk.
(6) Preparation: adding 1.5 times of water into the walnut micro powder obtained in the step (5), and grinding the walnut micro powder into pulp by using a colloid mill; stirring and grinding at 70 deg.C for 0.5h, adding 4 times of water, and grinding with colloid mill; stirring and grinding the walnut pulp at the temperature of 70 ℃ for 0.5h to obtain walnut pulp; adding 1% of tragacanth, grinding with colloid mill for 0.5 hr, adding 0.1% of sodium carboxymethylcellulose and sodium chloride, stirring, adding 3 times of purified water, and adjusting pH to 7.5; continuing the colloid mill grinding treatment to ensure that the particle size of the walnut milk primary pulp is less than 300 meshes; adding 5% of walnut granules into the peach milk raw pulp, and introducing into a homogenizer for homogenizing treatment to obtain walnut milk added with the walnut granules;
(7) packaging: filling the walnut milk added with the walnut granules, sterilizing at 121 ℃ for 25 minutes in a sterilization kettle, cooling accurately, spraying codes, and packaging.
Example 3
Walnut granules were prepared according to the following method:
(1) drying: drying the walnut kernels with the shells removed at the temperature of 50 ℃ for 4 hours;
(2) crushing: crushing the dried walnut kernels to obtain coarse walnut kernel particles;
(3) peeling walnut kernels: adding the coarse walnut particles obtained in the step (2) into a static torch for peeling, and sucking the kernel skin with poor conductivity by using a roller until the kernel skin is brushed off by a brush; the kernels with good conductivity fall in advance due to the charge transferred to the roller, and the peeled crushed particles of the coarse walnut kernels are collected.
(4) And (3) freeze drying: pre-freezing in a refrigerator at the temperature of minus 80 ℃, and then carrying out vacuum freeze drying until the water content is 5%;
(5) crushing: pulverizing the freeze-dried semen Juglandis in a pulverizer, pulverizing the coarse powder in an ultramicro pulverizing vibration mill at low temperature and nitrogen for 1min to obtain 80 mesh semen Juglandis granules, taking out 5% for feeding in the next step, and pulverizing the rest for 5min to obtain semen Juglandis micropowder.
Example 4
Walnut granules were prepared according to the following method:
(1) drying: drying the walnut kernels with the shells removed at the temperature of 70 ℃ for 4 hours;
(2) crushing: crushing the dried walnut kernels to obtain coarse walnut kernel particles;
(3) peeling walnut kernels: adding the coarse walnut particles obtained in the step (2) into a static torch for peeling, and sucking the kernel skin with poor conductivity by using a roller until the kernel skin is brushed off by a brush; the kernels with good conductivity fall in advance due to the charge transferred to the roller, and the peeled crushed particles of the coarse walnut kernels are collected.
(4) And (3) freeze drying: pre-freezing in a refrigerator at the temperature of minus 80 ℃, and then carrying out vacuum freeze drying until the water content is 5%;
(5) crushing: pulverizing the freeze-dried semen Juglandis in a pulverizer, pulverizing the coarse powder in an ultramicro pulverizing vibration mill at low temperature and nitrogen for 1min to obtain 80 mesh semen Juglandis granules, taking out 5% for feeding in the next step, and pulverizing the rest for 5min to obtain semen Juglandis micropowder.
Example 5
Walnut granules were prepared according to the following method:
(1) and (3) low-temperature drying: drying the walnut kernels with the shells removed, wherein the drying temperature is 60 ℃ for 4 hours;
(2) crushing: crushing the dried walnut kernels to obtain coarse walnut kernel particles;
(3) removing kernels and peels by an electrostatic method: adding the coarse walnut particles obtained in the step (2) into a static torch for peeling, and sucking the kernel skin with poor conductivity by using a roller until the kernel skin is brushed off by a brush; the kernels with good conductivity fall in advance due to the charge transferred to the roller, and the peeled crushed particles of the coarse walnut kernels are collected.
(4) And (3) drying under reduced pressure: vacuum drying at 80 deg.C to water content of 6%;
(5) crushing: and (2) putting the freeze-dried walnut kernels into a grinder to be ground, putting the coarse powder into an ultra-micro grinding vibration mill, grinding for 1min at normal temperature to obtain 60-mesh walnut particles, taking out 5% of the walnut particles for feeding in the next step, and continuously grinding the rest walnut particles for 5min to obtain walnut micro powder for preparing walnut milk.
Example 6
The walnut milk is prepared according to the following method:
(1) drying: drying the walnut kernels with the shells removed at the temperature of 50 ℃ for 4 hours;
(2) crushing: crushing the dried walnut kernels to obtain coarse walnut kernel particles;
(3) peeling walnut kernels: adding the coarse walnut particles obtained in the step (2) into a static torch for peeling, and sucking the kernel skin with poor conductivity by using a roller until the kernel skin is brushed off by a brush; the kernels with good conductivity fall in advance due to the charge transferred to the roller, and the peeled crushed particles of the coarse walnut kernels are collected.
(4) And (3) freeze drying: pre-freezing in a refrigerator at the temperature of minus 80 ℃, and then carrying out vacuum freeze drying until the water content is 5%;
(5) crushing: pulverizing the lyophilized semen Juglandis in a pulverizer, placing the coarse powder in a micronizing vibration mill, pulverizing at low temperature and under nitrogen for 3min to obtain semen Juglandis micropowder for preparing semen Juglandis milk;
(6) preparation: adding 1.5 times of water into the walnut micro powder obtained in the step (5), and grinding the walnut micro powder into pulp by using a colloid mill; stirring and grinding the mixture at the temperature of 40 ℃ for 2 hours, adding 1.5 times of water, and grinding the mixture by a colloid mill; stirring and grinding the walnut pulp at the temperature of 40 ℃ for 2 hours to obtain walnut pulp; adding appropriate amount of tragacanth, continuing to grind into slurry for 2h with colloid mill, adding appropriate amount of sodium carboxymethylcellulose and sodium chloride, stirring, adding 8 times of purified water to complement, and adjusting pH to 7.5; continuing the colloid mill grinding treatment to ensure that the particle size of the walnut milk primary pulp is between 300 and 350 meshes; and (5) obtaining the product.
(7) Packaging: filling the obtained walnut milk raw stock, sterilizing at 121 ℃ for 25 minutes in a sterilization kettle, cooling, spraying codes, and packaging.
Example 7
The walnut milk is prepared according to the following method:
(1) drying: drying the walnut kernels with the shells removed at the temperature of 50 ℃ for 4 hours;
(2) crushing: crushing the dried walnut kernels to obtain coarse walnut kernel particles;
(3) peeling walnut kernels: adding the coarse walnut particles obtained in the step (2) into a static torch for peeling, and sucking the kernel skin with poor conductivity by using a roller until the kernel skin is brushed off by a brush; the kernels with good conductivity fall in advance due to the charge transferred to the roller, and the peeled crushed particles of the coarse walnut kernels are collected.
(4) And (3) freeze drying: pre-freezing in a refrigerator at the temperature of minus 80 ℃, and then carrying out vacuum freeze drying until the water content is 5%;
(5) crushing: pulverizing the lyophilized semen Juglandis in a pulverizer, placing the coarse powder in a micronizing vibration mill, pulverizing at low temperature and under nitrogen for 3min to obtain semen Juglandis micropowder for preparing semen Juglandis milk;
(6) preparation: adding 1.5 times of water into the walnut micro powder obtained in the step (5), and grinding the walnut micro powder into pulp by using a colloid mill; stirring and grinding the mixture at the temperature of 40 ℃ for 2 hours, adding 1.5 times of water, and grinding the mixture by a colloid mill; stirring and grinding the walnut pulp at the temperature of 40 ℃ for 2 hours to obtain walnut pulp; adding appropriate amount of tragacanth, continuing to grind into slurry for 2h with colloid mill, adding appropriate amount of sodium carboxymethylcellulose and sodium chloride, stirring, adding 8 times of purified water to complement, and adjusting pH to 7.5; continuing the colloid mill grinding treatment to ensure that the particle size of the walnut milk primary pulp is between 160 and 200 meshes; and (5) obtaining the product.
(7) Packaging: filling the obtained walnut milk raw stock, sterilizing at 121 ℃ for 25 minutes in a sterilization kettle, cooling, spraying codes, and packaging.
Example 8
And (3) measuring the oxidation resistance of the walnut granules prepared by different processes: DPPH is dissolved in ethyl acetate and appears purple, has a maximum absorption value at the wavelength of 517nm, and the concentration and the absorbance are in a linear relationship, so that the antioxidant capacity of the substance can be represented by the DPPH scavenging capacity of the substance, can be measured by ultraviolet spectrophotometry, mixing 2mL Trolox standard solution (0, 20, 40, 60, 80, 100 μmol/L) with 4mL DPPH 100 μmol/L, standing in dark for 30min, measuring absorbance at 517nm, taking an ethyl acetate solution as a blank, drawing a standard curve, adding each obtained sample to be diluted to the concentration of 0.05g/mL and 0.5g/mL, respectively adding 4mL of 100 mu mol/L DPPH, recording the absorbance, the DPPH radical scavenging capacity of the samples was calculated from a standard curve, expressed as Trolox equivalents per gram of sample (μmol Trolox/g).
TABLE 1 determination of antioxidant Capacity of walnut granules prepared by different processes
Experimental data show that the antioxidant capacity of a sample is gradually reduced along with the increase of the drying temperature and the drying temperature, particularly the antioxidant capacity of the sample which is dried under reduced pressure at 80 ℃ and crushed at normal temperature is obviously reduced, and the process combining freeze drying and low-temperature nitrogen-filling crushing can effectively protect antioxidant components in walnut kernels which are beneficial to human bodies.
Example 9
The walnut milk obtained in the example 6 and the walnut milk obtained in the example 7, which have the same preparation process and are different in particle size, are selected as objects to be investigated and subjected to an in vitro intestinal absorption experiment.
(1) Protein absorption experiments:
healthy ICR mice were taken, fasted for 24h before the experiment, sacrificed, the abdominal cavity was immediately opened, the ileum section of the small intestine was separated, placed in Krebs-Ringer's solution at 4 ℃ previously charged with a mixed gas of 95% oxygen and 5% carbon dioxide, and washed with Krebs-Ringer's solution until no contents flowed out of the intestine.
Turning over the intestinal sac, fastening one end with cotton thread, sucking Krebs-Ringer's solution with a syringe, injecting into the intestinal segment to fill the intestinal sac with liquid to form small sac shape, placing in a tube of Krebs-Ringer's solution, maintaining at 37 deg.C, and continuously introducing mixed gas of 95% oxygen and 5% carbon dioxide. And balancing for 5min, adding walnut milk samples (diluted by 100 times) prepared in different examples into the tube, sampling from the intestinal sac for 1 time at 15min, 30min, 60min and 120min, and immediately injecting Krebs-Ringer's solution with the same volume into the intestinal sac to complement the volume. And (3) measuring the protein content in the sample by adopting a Coomassie brilliant blue method, and inspecting the intestinal absorption condition of the protein in the sample.
TABLE 2 protein content in samples after intestinal absorption
(2) Amino acid absorption test
Weighing 1mL of sample absorbed by intestines, putting the sample into a proteolysis tube, adding a proper amount of 6mol/L hydrochloric acid, dripping a few drops of phenol, sealing the tube after nitrogen filling, placing the tube into a 110 ℃ oven for keeping for 24 hours, filtering the tube into a 20mL volumetric flask through filter paper after cooling, repeatedly flushing the proteolysis tube and the filter paper by ultrapure water, and finally fixing the volume to the scale. Evaporating 1mL of sample solution in evaporating dish on steam bath, adding ultrapure water, repeating for 3 times, diluting the residue with 0.02mol/L HCl to 10mL, filtering with 0.45 μm filter membrane, detecting amino acid content in the sample after intestinal absorption with amino acid analyzer,
TABLE 3 Total amino acid content in samples after intestinal absorption
Experiments show that the absorption rates of protein and amino acid of the raw walnut pulp obtained from the same batch of walnut kernels under different particle sizes are remarkably different, and the finer the particles, the higher the absorption rate is, so that the superfine grinding process selected by the invention has a promoting effect on the absorption of protein and amino acid in the walnut milk, and the absorption rate of the effect are better than 200 meshes at 300 meshes.
The processing method of the walnut granules in the granular walnut milk beverage disclosed by the invention removes the walnut kernel peel by adopting a method combining low-temperature drying and crushing with electrostatic adsorption, can ensure the peeling effect, also protects the antioxidant components in the walnut kernel from being damaged, simultaneously does not need to rinse after peeling to remove residual alkali liquor, saves water and wastewater treatment, adopts an ultramicro crushing process to ensure that the walnut milk granules are smaller than 300 meshes, can improve the absorption rate of protein and amino acid, and adds the walnut granules crushed to a certain particle size in the walnut milk, so that the taste of the walnut milk beverage is improved on the basis of ensuring the quality of the walnut milk, and the method has popularization value.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.
Claims (6)
1. A processing method of walnut granules in a granular walnut milk beverage comprises the following steps in sequence:
(1) and (3) low-temperature drying: drying the walnut kernels with the shells removed at the temperature of not higher than 60 ℃ for 4-6 hours;
(2) crushing: crushing the dried walnut kernels to obtain coarse walnut kernel particles;
(3) removing kernels and peels by an electrostatic method: adding the coarse walnut particles obtained in the step (2) into a static torch for peeling, and sucking the kernel skin with poor conductivity by using a roller until the kernel skin is brushed off by a brush; the kernels with good conductivity fall in advance due to the charge transferred to the roller, and the peeled coarse walnut kernel particles are collected;
(4) and (3) freeze drying: pre-freezing in a refrigerator at the temperature of minus 80 ℃, and then carrying out vacuum freeze drying until the water content is lower than 8%;
(5) crushing: crushing the freeze-dried walnut kernels in a crusher, putting the coarse powder in an ultra-micro crushing vibration mill, crushing for 1min at low temperature and under the nitrogen condition to obtain walnut particles, taking out 5% of the walnut particles for feeding in the next step, and continuously crushing the rest of the walnut particles for 5min to obtain walnut micro powder for preparing walnut milk;
(6) preparation: adding 1.5 times of water into the walnut micro powder obtained in the step (5), and grinding the walnut micro powder into pulp by using a colloid mill; stirring and pulping at 40-70 ℃ for 0.5-2 hours, adding 1.5-4 times of water, and performing colloid mill pulping; stirring and pulping at the temperature of 40-70 ℃ for 0.5-2 h to obtain walnut pulp; adding a proper amount of tragacanth into the mixture, continuing to grind the mixture into thick liquid for 0.5 to 2 hours by using a colloid mill, adding a proper amount of sodium carboxymethylcellulose and sodium chloride, fully stirring, adding 3 to 8 times of purified water for complementing, and adjusting the pH to 7 to 7.5; continuing the colloid mill grinding treatment to ensure that the particle size of the walnut milk primary pulp is less than 300 meshes; adding the walnut granules into the peach milk raw pulp according to the material-liquid ratio, and introducing into a homogenizer for homogenizing treatment to obtain walnut milk added with the walnut granules;
(7) packaging: filling the walnut milk added with the walnut granules, sterilizing in a sterilization kettle at the temperature of 121-.
2. The method for processing walnut granules according to claim 1, wherein the drying temperature in the processing step (1) is 40 to 50 ℃.
3. The method for processing walnut granules according to claim 1, wherein the water content in the processing step (4) is 5%.
4. The method for processing walnut granules according to claim 1, wherein the ratio of the material to the liquid in the processing step (6) is 1:20 to 1: 50.
5. The method for processing walnut granules according to claim 1, wherein the additive in the processing step (6) is: the dosage of sodium chloride is 0.05 percent, the dosage of tragacanth is 0.5 to 1 percent, and the dosage of sodium carboxymethylcellulose is 0.1 to 1 percent.
6. The method for processing walnut granules according to claim 1, wherein the particle size of the walnut granules in the processing step (5) is not less than 60 mesh.
Priority Applications (1)
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