CN103300293A - Processing method of wheat seedings as well as instant wheat seeding powder and wheat seeding fiber powder prepared from same - Google Patents

Abstract

The invention discloses a processing method of wheat seedlings and instant wheat seedling powder and wheat seedling fiber powder prepared therefrom, aiming at solving the outstanding problems in processing wheat seedlings by adopting the existing preparation technology of wheat seedling juice powder, for example, some methods adopt hot air at 145-165°C Drying, the processing time is a little longer, which seriously affects the product quality; when the wheat seedlings are processed by the controlled anti-sticking spray drying method, the blanching temperature is as high as 95°C-98°C, which will greatly destroy the enzymes and functional components. The processing method comprises the following steps: pretreatment, color protection, beating, filtering, homogenization and spray drying. The invention can effectively reduce the blanching temperature, so that the functional components can be kept to the greatest extent, and at the same time, the wheat seedling juice can be directly sprayed, and by controlling the spray process parameters, a better spray effect can be obtained, the process is simple, the operation method is short, the spray time is short, and the product is not dry. Caking.

Description

A kind of wheatgrass processing method and instant wheatgrass powder and wheatgrass fiber powder prepared therefrom

The invention relates to the field of food processing, in particular to a processing method of wheat grass and instant wheat grass powder and wheat grass fiber powder prepared therefrom.

Background technique

Wheat seedling (Wheat seedling), also known as wheat grass, is the tender stems and leaves of the grass family, Tritium (Tritium) plant wheat. my country is a major producer of wheat, mainly winter wheat, with an annual output of more than 100 million tons. Most of the tillers of winter wheat are ineffective tillers before winter and early spring, so the available wheat seedling resources are very abundant. The comprehensive utilization of wheat seedling resources and the development of industrialized processed products are particularly important and urgent, and need to attract the attention of food workers.

Modern medical research has found that wheat seedlings contain chlorophyll, natural vitamins, 25% protein, more than 20 kinds of amino acids, hundreds of different active enzymes and a variety of minerals. And other unique nutrition and health effects, the development value is huge. Qiao Wenjing's (2009) research shows that the protein content of wheat seedlings is much higher than that of common fruits and vegetables, even equivalent to that of beef, and 2.6 times that of rice; the content of dietary fiber in wheat seedlings is also very high, as 5.0 times that of shiitake mushrooms; the content of vitamins in wheat seedlings is also quite rich, of which the content of _VA is 6.5 times that of eggs, 3.0 times that of spinach, and _VC is also richer than that in common vegetables. At the same time, the content of _VE in wheat seedlings is particularly high, which is 5.8 times that of eggs. The mineral content it contains is also very rich. The potassium content is 7.4 times that of spinach and 6.1 times that of fresh jujube; the magnesium content is 4.3 times that of spinach; the calcium content is 2.8 times that of spinach and 1.8 times that of milk; the iron content is 6.5 times that of spinach and 5.7 times that of beef; the zinc content is 2.8 times that of beef and 15.9 times that of spinach. Research by Wang Yonghui et al. (2011) shows that wheat seedlings are rich in 18 kinds of amino acids, especially the ratio of essential amino acids to total amino acids is 39%, and the ratio of essential amino acids to non-essential amino acids reaches 63%, which is in line with the ideal model of FAO/WHO. The proportion is balanced, it is a kind of complete nutrition food. In addition, wheat seedlings also contain a large number of other bioactive components, such as antioxidant enzymes, chlorophyll, polyphenols and active polysaccharides. Zhao Chungui et al. (2005) measured that the SOD activity of wheat seedling juice was 354.49 U/mg·Pr, 7 times that of grapes, and the activity of glutathione peroxidase was 83.63 U/mg·Pr; the total antioxidant activities were respectively It is 4.9 times and 7.2 times that of BHT and α-tocopherol, and the content of flavonoids is 283 mg/kg.

With the progress of society, people's eating habits have undergone great changes, and various diseases of affluence have been caused due to unbalanced nutrition. As a kind of pure natural, green and pollution-free food raw material, wheatgrass can be made into food, which is beneficial to adjust the nutritional balance in the human body and treat the diseases of affluence caused by eating habits. However, wheatgrass itself has disadvantages such as easy browning, poor taste, strong grassy smell, and easy loss of nutrients, which discourages people who desire health, and has been ignored for a long time.

Chinese patent CN00119778.9 discloses a preparation process of barley juice powder, which first selects tender barley shoots, successively washes, crushes, squeezes juice, filters, concentrates, adds dextrin aqueous solution, homogenizes, and dries to obtain barley juice powder. This method uses hot air at 145-165°C for drying, and the processing time is slightly longer. Since the wheat seedlings contain high levels of oxidase, this method easily leads to oxidative browning and loss of nutrients, which seriously affects the quality of the product.

Chinese patent CN200710134404.X discloses a preparation method of spray-drying instant composite solid fruit and vegetable beverage with controlled anti-sticking wall. In this method, after the fruits and vegetables are washed, cut, blanched, beaten, homogenized and concentrated in sequence, different proportions need to be added Drying aids and anti-caking agents are used to solve the problem of wall sticking of fruit and vegetable juices during spraying, and finally stabilizers are used to granulate and shape. The solid fruit and vegetable beverage produced by this method has good stability and is not easy to bond, but its production process is cumbersome, mainly for fruits and vegetables with high sugar content; and its blanching temperature is as high as 95°C-98°C, which greatly damages the fruit and vegetable Various enzymes and functional ingredients of various enzymes and functional ingredients. At the same time, ingredients such as drying aids, anticaking agents, and stabilizers need to be added in this method, and the ratio of these ingredients is relatively fixed, and these ingredients are likely to affect the taste of the final product. It is not conducive to the deployment of products according to different flavor requirements in the later stage, which limits the types of final products and narrows the way of product utilization.

Contents of the invention

The purpose of the present invention is to solve the outstanding problems in the processing of wheat seedlings by using the existing wheat seedling juice powder preparation process, such as using hot air at 145-165°C for drying in some methods, which takes a long time to process and seriously affects product quality; When the wall spray drying method is used to process wheat seedlings, the blanching temperature is as high as 95°C-98°C, which will greatly destroy the enzymes and functional components; adding drying aids, anti-caking agents, stabilizers and other ingredients will affect the final product The taste of the wheat grass restricts the types of products; aiming at these problems, a processing method of wheat grass and instant wheat grass powder and wheat grass fiber powder prepared therefrom are provided. The invention can effectively reduce the blanching temperature, so that the functional components in the wheat seedlings can be preserved to the greatest extent, and at the same time, the wheat seedling juice can be directly sprayed, and by controlling the spraying process parameters, a good spraying effect can be achieved, and the process is simple, the operation is convenient, and the spraying time is short. Short, the product does not clump. The present invention can effectively retain the original nutritional components, color and flavor of the wheatgrass product, can be seasoned according to the needs of consumers, and makes up for various shortcomings of the wheatgrass juice drink. At the same time, the filter residue after extraction of wheatgrass juice can be prepared into wheatgrass fiber powder after freeze-drying, which can be added to various flour products as natural pigment and increase its dietary fiber content. The invention can make full use of the wheat seedling resources and improve the economic value.

In order to achieve the above object, the present invention adopts the following technical solutions:

A processing method for wheat seedlings, comprising the steps of:

(1) Pretreatment: Take wheat seedlings as raw materials, clean them, and set aside;

(2) Color protection: immerse the wheat seedlings cleaned in step (1) into the composite color protection solution at 70°C-85°C and blanch for 2-8 minutes, after blanching, filter the wheat seedlings with a sieve and cool to room temperature;

(3) Beating: move the wheat seedlings cooled to room temperature in step (2) into a crusher, add water for crushing and beating, and obtain beating wheat seedling juice, wherein the mass ratio of wheat seedlings to water is 1:4-8;

(4) Filtration: filtering the beating barley juice to obtain the first filtrate and the first filter residue;

(5) Homogenization: Pour the first filtrate into a tempering homogenizer, and perform high-pressure homogenization twice at a temperature of 60~70°C. The first pressure is 20~25MPa, and the time is 3-10min. The pressure for the second time is 20~25MPa, and the time is 3-10min to obtain homogeneous barley juice;

(6) Spray drying: Spray-dry the homogeneous wheat grass juice to obtain instant wheat grass powder. The air inlet temperature of spray drying is 170°C-190°C, the feed flow rate is 250mL/h-265mL/h, and the outlet air temperature 55°C-75°C, spray pressure 0.15MPa-0.5MPa;

In the step (2), every 100mL of the compound color protection solution contains 0.01-0.05g of citric acid, 0.02-0.08g of ascorbic acid, and 0.5-2.5g of sodium chloride.

In the step (1), wheat seedlings with a growth time of 30-60 days and a length of 25-30 cm are selected as raw materials, cleaned, cut into small sections of 1-2 cm, and set aside.

In the step (2), the wheat seedlings cleaned in the step (1) are immersed in the composite color protection solution at 75° C. and blanched for 6 minutes. After blanching, the wheat seedlings are filtered through a sieve and cooled to room temperature.

In the step (2), every 100mL of the compound color protection solution contains 0.03g of citric acid, 0.07g of ascorbic acid, and 1.5g of sodium chloride.

In the step (2), the wheat seedlings cleaned in the step (1) are immersed in the composite color protection solution at 75° C. and blanched for 6 minutes. After blanching, the wheat seedlings are filtered with a sieve, rinsed with water, and cooled to room temperature.

In the step (3), the wheat seedlings cooled to room temperature in the step (2) are moved into a crusher, and water is added for crushing and beating to obtain beaten wheat seedling juice, wherein the mass ratio of wheat seedlings to water is 1:6.

In the step (4), the beating barley juice is filtered to obtain the primary filter filtrate and the primary filter residue, and the primary filter residue is sieved after pressure filtration to obtain the secondary filtrate and the first filter residue, and the primary filter filtrate and the secondary filtrate combined to obtain the first filtrate.

In the step (4), a 50-300 mesh screen is used to beat the pulp and filter the barley juice.

In the step (6), the homogeneous barley juice is spray-dried to obtain instant barley powder, wherein the air inlet temperature of the spray drying is 180°C, the feed flow rate is 260mL/h, the air outlet temperature is 65°C, and the spray drying The pressure is 0.3 MPa.

In the step (6), the homogeneous wheat grass juice is spray-dried to obtain instant wheat grass powder, and the instant wheat grass powder is sealed and packaged with vacuum aluminum foil.

Freeze the first filter residue obtained in step (4) at -50°C for 6-10 hours, then sublimate and dry at -20°C and 2-10Pa for 24 hours, and then pulverize to obtain wheat seedling fiber powder.

Freeze the first filter residue obtained in step (4) at -50°C for 6-10 hours, then dry it at -20°C and 2-10Pa for 24 hours, and then pulverize it to obtain wheat seedling fiber powder. It is packaged in vacuum aluminum foil sealed package.

Freeze the first filter residue obtained in step (4) at -50°C for 6-10 hours, then sublimate and dry at -20°C and 2-10Pa for 24 hours, then pulverize and pass through a 50-300 mesh sieve to obtain wheat seedlings fiber powder.

The instant wheatgrass powder prepared by the aforementioned wheatgrass processing method.

The wheat grass fiber powder prepared by the aforementioned wheat grass processing method.

The processing method of wheat seedling provided by the invention comprises the following steps: pretreatment, color protection, beating, filtering, homogenization and spray drying. After the wheat seedlings in the present invention go through the color protection step, the grassy smell of the wheat seedlings can be significantly reduced or even disappeared, and the grassy smell of the wheat seedlings will not appear in the prepared instant wheat grass powder; at the same time, the original smell of the wheat seedlings can be better protected The color is stable, and it will not fade after spray drying and storage at room temperature in the later period.

At the same time, on the basis of spray drying, the present invention adds hot blanching composite color protection operation, and by using composite color protection solution combined with low temperature blanching, the blanching temperature can be effectively reduced, and the damage of functional components in wheat seedlings can be minimized; through The combination of compound color protection solution and low-temperature hot blanching is more beneficial to remove the original grassy smell in the wheat seedlings. On the premise of keeping the original color of the wheat seedlings in the prepared products, the products have a slight fragrance and significantly improve the product quality. Compared with the Chinese patent CN00119778.9 (a preparation process of barley juice powder) which adopts hot air drying at 145~165°C, which will easily lead to oxidative browning and loss of nutrients, which will seriously affect the quality of the product, the present invention combines the color protection liquid with heat The combination of hot and color protection can effectively reduce the hot temperature and time. Wheat seedlings contain a high content of oxidase, and the reduction of blanching temperature and time can maximize the retention of functional components in wheat seedlings.

In the Chinese patent CN200710134404.X (a preparation method of spray-drying instant composite solid fruit and vegetable beverages with controlled anti-sticking wall), it is necessary to add different proportions of drying aids and anti-caking agents to solve the problem of wall sticking of fruit and vegetable juices during spraying. It affects the taste of the final product and limits the types of the final product, and its blanching temperature is as high as 95°C-98°C, which greatly destroys various enzymes and functional components in fruits and vegetables; compared with this patent, the present invention It adopts spray drying, and the homogeneous wheat seedling juice only contains water, so it is easy to spray, not easy to agglomerate and stick to the wall, and the spray effect is good. At the same time, it does not contain substances such as drying aids and anti-caking agents, and the final product is safer. , green, and easy to use as food ingredients later. At the same time, the spray-drying method of the present invention is also different from the technology of blending first and then spraying in the processing of fixed beverages (or medicine granules), but directly uses homogeneous wheatgrass juice to spray-dry, and the spraying effect is better.

The present invention can be directly prepared into instant wheatgrass powder, which can be made into different wheatgrass products after later deployment, which makes up for various shortcomings of wheatgrass products, retains the most original nutritional components, color and flavor of wheatgrass, and allows consumers to quickly , In a convenient situation, you can drink a nutritious and delicious pure natural green drink. At the same time, it can be used as an auxiliary material and added to various foods to make the food have a light wheat green color and improve the nutrition of the food at the same time.

The present invention also makes full use of wheat seedling resources, not only prepares instant wheat seedling powder, but also prepares wheat seedling fiber powder by using freeze-drying technology from the wheat seedling filter residue, on the one hand retains the green color of wheat seedling fiber, and is insoluble in The functional components of water are also preserved. At the same time, the functional components combined in the wheatgrass cellulose can also retain their functional activity by adopting freeze-drying technology. The wheatgrass fiber powder is rich in insoluble dietary fiber, which has the functions of increasing the peristalsis of the intestinal tract and adjusting the microbial flora. content while improving color.

The invention adopts homogeneous wheat seedling juice to spray directly, and its spray effect is better than that of the traditional blended spray, and the powder does not stick to the wall and disperses. Simultaneously, the present invention directly prepares instant wheatgrass powder, which can be matched with other components, and after non-homogeneous wheatgrass juice is blended with other components, it is then spray-dried; the applicant also tested the spray after blending and found that the spray The effect is relatively poor, and it is easy to block the nozzle, which may be related to the fact that there are more water-soluble components in the wheat seedlings, and precipitation and flocculation are easy to occur after the deployment of sucrose. Spray after drinking. The instant wheatgrass powder prepared by the present invention is a brand-new solid beverage similar to "instant coffee". Substances, vitamins, etc., and other ingredients that are beneficial to human health, such as total phenols, flavonoids, ferulic acid, superoxide dismutase (SOD) and other substances, the final product has antioxidant, hypoglycemic, hypolipidemic, anti Aging, anti-cancer and other aspects of the effect.

In summary, the present invention can balance the dietary structure, balance the nutrition of the human body, comprehensively provide the daily nutrition required by the human body, and play an important role in the prevention and treatment of human health and modern civilization diseases. The product prepared by the invention can remove the original grassy smell in the wheat seedlings to make the product slightly fragrant, and at the same time fully retain the original nutritional components in the wheat seedlings, and the obtained product has anti-oxidation, hypoglycemic, hypolipidemic, anti-aging, anti-cancer, etc. In addition, it is convenient for later deployment into products with different flavors. At the same time, the resulting filter residue can also be used as food accessories to increase its dietary fiber content and adjust food color. The invention has important reference value for the intensive processing and utilization of wheat seedlings, and the product has broad market potential.

Detailed ways

All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and/or steps.

Any feature disclosed in this specification, unless specifically stated, can be replaced by other alternative features that are equivalent or have similar purposes. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.

Example 1

(1) Pretreatment: Choose fresh tender wheat seedlings with a length of 25-30cm that have grown for about 45 days as raw materials, without rot, yellowing, moths, etc. Use a shearing machine to cut it from about 3cm above the ground, remove impurities and sand, soak it in clean water, rinse it with water, drain the water and cut it into 2cm sections for later use. The time of each link in the whole operation process should be shortened as much as possible. In order to avoid browning before color protection and affect subsequent processing.

(2) Color protection: quickly immerse the pretreated wheat seedlings in the compound color protection solution at 75°C and blanch for 6 minutes to inactivate the activity of oxidase and remove the grassy smell, and at the same time, prevent the enzymatic browning caused by heat during processing. change, affecting product quality. Among them, every 100mL of compound color protection liquid contains 0.03g of citric acid, 0.07g of ascorbic acid, and 1.5g of sodium chloride. After blanching and color protection, the wheat seedlings are filtered with a sieve, rinsed with water and cooled to room temperature.

(3) Beating: Move the wheat seedlings cooled to room temperature into a high-speed tissue masher, add water for crushing and beating, and obtain beaten wheat seedling juice. Among them, the mass ratio of wheat seedlings cooled to room temperature to water is 1:6, that is, the ratio of material to liquid is 1:6.

(4) Filtration: filter the beating barley juice with a 150-mesh sieve to obtain the primary filtrate and the primary filter residue. The primary filter residue is filtered through a 150-mesh sieve to obtain the secondary filtrate and the first filter residue. Combined with the second filtrate to obtain the first filtrate.

(5) Homogenization: Pour the first filtrate into a tempering homogenizer, perform high-pressure homogenization twice at a temperature of 60~70°C, the first pressure is 20MPa, the second pressure is 25MPa, and the second time is 25MPa. The homogenization time is 5 min each. The purpose of homogenization is to prevent product stratification and precipitation, make the barley juice more delicate, and help to stabilize the quality and flavor of the finished product.

(6) Spray drying: Spray-dry the homogeneous barley juice to obtain instant barley powder, wherein the air inlet temperature of the spray drying is 180°C, the feed flow rate of the homogeneous barley juice is 260mL/h, and the solid-liquid ratio is 1 :6, the air outlet temperature is 65°C, and the spray pressure is 0.3MPa. The instant wheatgrass powder is vacuum pumped with oxygen and nitrogen in an aluminized film bag, protected from light, and packed.

Weigh 6.5 grams (dry basis) of the instant barley grass powder in this example, take it as an independent package, add 100 mL of warm boiled water at 60 to 70 ° C, brew it, and then drink it.

The first filter residue was frozen at -50°C for 10 hours, and then dried under vacuum sublimation at -20°C and 10 Pa for 24 hours to complete freeze-drying. After being freeze-dried, it is pulverized, and then sealed and packaged with vacuum aluminum foil to obtain the wheat seedling fiber powder.

The main functional components contained in the instant wheatgrass powder prepared in Example 1 are determined

1) Determination of total phenols

Wheatgrass juice instant solid beverage powder is extracted with ethanol ultrasonically to obtain alcohol extract, most of which are highly polar substances. In this experiment, gallic acid was used as a standard substance to determine the total phenolic content in wheatgrass juice instant solid beverage.

The results of determination of total phenol content in instant wheatgrass powder were as follows: the absorbance was 0.054, the mass concentration of total phenol was 0.00048 mg/mL, and the content of total phenol was 0.24%.

2) Determination of total flavonoids

Phenolic compounds mainly include flavonoids and other substances, and rutin was used as a standard to determine the total flavonoid content in wheatgrass juice instant solid beverage.

The determination results of total flavonoids in instant wheatgrass powder were as follows: the absorbance was 0.012, the mass concentration of total phenols was 0.00057 mg/mL, and the content of total phenols was 0.036%.

3) Determination of ferulic acid

The content of ferulic acid in instant wheatgrass powder was measured three times and the average value was taken. The results showed that the average content was 0.24 μg/mL.

4) The scavenging ability of instant wheatgrass powder on diphenylpichydrazine free radicals (DPPH·)

The scavenging ability of DPPH reflects the antioxidant activity of the tested substance, and the operation is simple, fast and sensitive.

At present, there is no report on the ability of barley juice instant solid beverage to scavenge DPPH free radicals in China, but studies have shown that barley juice has high antioxidant capacity, and its total antioxidant capacity is 4.9 times that of BHT and α-tocopherol and 7.2 times, the inhibition rate of DPPH·free radicals is 36.74%. The experimental results show that the instant barley grass powder prepared in Example 1 has a scavenging rate of 52.1% for DPPH free radicals.

5) Determination of other free radical scavenging abilities

The scavenging abilities of instant wheatgrass powder on hydroxyl radicals (·OH) and superoxide anion radicals (O ₂ ^- ·) were 30% and 75.25%, respectively.

The color protection effect of the instant barley grass powder prepared in this example is the best. The test results show that the wheatgrass juice instant solid beverage has strong antioxidant capacity in vitro and has broad development prospects.

Example 2

(1) Pretreatment: Choose fresh tender wheat seedlings with a length of 25-30cm for about 60 days as raw materials, without rot, yellowing, moths and other phenomena. Use a shearing machine to cut it from about 3cm above the ground, remove impurities and sand, wash it in clean water, rinse it with water, drain the water and cut it into 1.5cm sections for later use. The time of each link in the whole operation process should be shortened as much as possible , so as to avoid browning before color protection and affect subsequent processing.

(2) Color protection: quickly immerse the pretreated wheat seedlings in a compound color protection solution at 85°C for 3 minutes to blanch the oxidase activity and remove the grassy smell, and at the same time prevent enzymatic browning caused by heat during processing. change, affecting product quality. Among them, every 100mL of compound color protection liquid contains 0.01g of citric acid, 0.03g of ascorbic acid, and 0.5g of sodium chloride. After blanching and color protection, the wheat seedlings are filtered with a sieve, rinsed with water and cooled to room temperature.

(3) Beating: Move the wheat seedlings cooled to room temperature into a high-speed tissue masher, add water for crushing and beating, and obtain beaten wheat seedling juice. Among them, the mass ratio of wheat seedlings cooled to room temperature to water is 1:7, that is, the ratio of solid to liquid is 1:7.

(4) Filtration: filtering the beating barley juice with a 150-mesh screen to obtain the first filtrate and the first filter residue.

(5) Homogenization: Pour the first filtrate into a tempering homogenizer, perform high-pressure homogenization twice at a temperature of 70°C, the first pressure is 25MPa, the homogenization time is 3min, and the second pressure is 22MPa, homogenization time is 8min. The purpose of homogenization is to prevent product stratification and precipitation, make the barley juice more delicate, and help to stabilize the quality and flavor of the finished product.

(6) Spray drying: Spray-dry the homogeneous barley juice to obtain instant barley powder, wherein the air inlet temperature of the spray drying is 185°C, the feed flow rate of the homogeneous barley juice is 250mL/h, and the solid-liquid ratio is 1 :7, the outlet air temperature is 75°C, and the spray pressure is 0.45MPa. The instant wheatgrass powder is vacuum pumped with oxygen and nitrogen in an aluminized film bag, protected from light, and packed.

Weigh 6.5 grams (dry basis) of the instant barley grass powder in this example, take it as an independent package, add 100 mL of warm boiled water at 60 to 70 ° C, brew it, and then drink it.

After the first filter residue was frozen at -50°C for 6 hours, it was vacuum sublimated and dried at -20°C and 5 Pa for 24 hours to complete freeze-drying. After being freeze-dried, it is pulverized, and then sealed and packaged with vacuum aluminum foil to obtain the wheat seedling fiber powder. The color protection effect of the instant wheatgrass powder and wheatgrass fiber powder prepared in this embodiment is better.

Example 3

(1) Pretreatment: Choose fresh tender wheat seedlings that have grown for about 40 days and are 25-30 cm long as raw materials, without rot, yellowing, and moths. Use a shearing machine to cut it from about 3cm above the ground, remove impurities and sand, soak it in clean water, rinse it with water, drain the water and cut it into 2cm sections for later use. The time of each link in the whole operation process should be shortened as much as possible. In order to avoid browning before color protection and affect subsequent processing.

(2) Color protection: quickly immerse the pretreated wheat seedlings in a compound color protection solution at 70°C and blanch for 8 minutes to inactivate the activity of oxidase and remove the grassy smell, and at the same time, prevent the enzymatic browning caused by heat during processing. change, affecting product quality. Among them, every 100mL of compound color protection solution contains 0.05g of citric acid, 0.07g of ascorbic acid, and 2.2g of sodium chloride. After blanching and color protection, the wheat seedlings are filtered with a sieve, rinsed with water and cooled to room temperature.

(3) Beating: Move the wheat seedlings cooled to room temperature into a high-speed tissue masher, add water for crushing and beating, and obtain beaten wheat seedling juice. Among them, the mass ratio of wheat seedlings cooled to room temperature to water is 1:4, that is, the ratio of solid to liquid is 1:4.

(4) Filtration: filtering the beating barley juice with a 300-mesh screen to obtain the first filtrate and the first filter residue.

(5) Homogenization: Pour the first filtrate into a tempering homogenizer, perform high-pressure homogenization twice at a temperature of 60°C, the first pressure is 20MPa, the homogenization time is 10min, and the second pressure is 22MPa, homogenization time is 6min. The purpose of homogenization is to prevent product stratification and precipitation, make the barley juice more delicate, and help to stabilize the quality and flavor of the finished product.

(6) Spray drying: Spray-dry the homogeneous barley juice to obtain instant barley powder, wherein the air inlet temperature of the spray drying is 170°C, the feed flow rate of the homogeneous barley juice is 265mL/h, and the solid-liquid ratio is 1 :4, the air outlet temperature is 55°C, and the spray pressure is 0.20MPa. The instant wheatgrass powder is vacuum pumped with oxygen and nitrogen in an aluminized film bag, protected from light, and packed.

Weigh 6.5 grams (dry basis) of the instant barley grass powder in this example, take it as an independent package, add 100 mL of warm boiled water at 60 to 70 ° C, brew it, and then drink it.

The first filter residue was frozen at -50°C for 8 hours, and then dried under vacuum sublimation at -20°C and 8 Pa for 24 hours to complete freeze-drying. After being freeze-dried, it is pulverized, and then sealed and packaged with vacuum aluminum foil to obtain the wheat seedling fiber powder. The color protection effect of the instant wheatgrass powder and wheatgrass fiber powder prepared in this embodiment is better.

The present invention is not limited to the foregoing specific embodiments. The present invention extends to any new feature or any new combination disclosed in this specification, and any new method or process step or any new combination disclosed.

Claims (10)

1. a processing method of barley, is characterized in that, comprises the steps: (1) Pretreatment: Take wheat seedlings as raw materials, clean them, and set aside; (2) Color protection: immerse the wheat seedlings cleaned in step (1) into the composite color protection solution at 70°C-85°C and blanch for 2-8 minutes, after blanching, filter the wheat seedlings with a sieve and cool to room temperature; (3) Beating: move the wheat seedlings cooled to room temperature in step (2) into a crusher, add water for crushing and beating, and obtain beating wheat seedling juice, wherein the mass ratio of wheat seedlings to water is 1:4-8; (4) Filtration: filtering the beating barley juice to obtain the first filtrate and the first filter residue; (5) Homogenization: Pour the first filtrate into a tempering homogenizer, and perform high-pressure homogenization twice at a temperature of 60~70°C. The first pressure is 20~25MPa, and the time is 3-10min. The pressure for the second time is 20~25MPa, and the time is 3-10min to obtain homogeneous barley juice; (6) Spray-drying: Spray-dry the homogeneous barley juice to obtain instant barley powder. The air inlet temperature of the spray-drying is 170°C-190°C, the feed flow rate is 250mL/h-265mL/h, and the solid-liquid ratio 1:4-1:8, the air outlet temperature is 55°C-75°C, and the spray pressure is 0.15MPa-0.5MPa; In the step (2), every 100mL of the compound color protection solution contains 0.01-0.05g of citric acid, 0.02-0.08g of ascorbic acid, and 0.5-2.5g of sodium chloride. 2. The processing method of wheat seedlings according to claim 1, characterized in that, in the step (1), the wheat seedlings with a growth time of 30-60 days and a length of 25-30 cm are selected as raw materials, cleaned and cut into 1 A small section of -2cm is reserved. 3. The processing method of wheat seedlings according to claim 1, characterized in that in the step (2), the wheat seedlings cleaned in step (1) are immersed in a composite color-protecting solution at 75°C and blanched for 6 minutes, and after blanching Filter the wheat seedlings with a sieve and cool to room temperature. 4 . The processing method of wheat seedlings according to claim 1 , characterized in that, in the step (2), every 100 mL of the compound color protection solution contains 0.03 g of citric acid, 0.07 g of ascorbic acid, and 1.5 g of sodium chloride. 5. The processing method of wheat seedlings according to claim 1, characterized in that in the step (3), the wheat seedlings cooled to room temperature in step (2) are moved into a crusher, and water is added for crushing and beating to obtain beating barley seedling juice, Among them, the mass ratio of wheat seedlings to water is 1:6. 6. The processing method according to any one of claims 1-5, characterized in that, in the step (4), filtering the beaten wheat seedling juice to obtain the primary filtrate and the primary filter residue, the primary filter residue After pressure filtration and sieving, the secondary filtrate and the first filter residue are obtained, and the primary filtrate and the secondary filtrate are combined to obtain the first filtrate. 7. The processing method of wheat grass according to any one of claims 1-5, characterized in that in the step (6), the homogeneous wheat grass juice is spray-dried to obtain instant wheat grass powder, wherein the spray-dried The air temperature is 180°C, the feed flow rate is 260mL/h, the outlet air temperature is 65°C, and the spray pressure is 0.3MPa. 8. The processing method of wheat seedlings according to any one of claims 1-7, characterized in that the first filter residue obtained in step (4) is frozen at -50°C for 6-10h, and then frozen at -20°C, 2- Under a vacuum condition of 10 Pa, sublimation and drying were carried out for 24 hours, and the samples were dried and then pulverized to obtain wheat seedling fiber powder. 9. The instant wheat grass powder prepared by the processing method of the wheat grass according to claims 1-8. 10. the wheat grass fiber powder that the processing method of wheat grass according to claim 8 prepares.