阅读说明：本技术 一种纤维复合用藜麦蛋白液及藜麦蛋白纤维的制备方法 (Quinoa protein liquid for fiber compounding and preparation method of quinoa protein fiber ) 是由 赵志远 黄金洪 张静 于 2020-12-17 设计创作，主要内容包括：本发明公开了一种纤维复合用藜麦蛋白液及藜麦蛋白纤维的制备方法,解决了现有的藜麦蛋白的提取和改性方法并不适用于与再生纤维素纤维结合,且无藜麦蛋白纤维复合材料的技术问题。本发明包括先后采用十六烷基磺酸钠和三羟甲基丙烷三甲基丙烯酸酯对藜麦蛋白液进行改性处理得到改性藜麦蛋白液。本发明提取的藜麦蛋白的含量和纯度适用于与纤维素纤维复合,且得到的藜麦蛋白复合纤维的蛋白含量高,断裂强度高等优点。(The invention discloses quinoa protein liquid for fiber compounding and a preparation method of quinoa protein fibers, and solves the technical problems that the existing extraction and modification method of quinoa protein is not suitable for being combined with regenerated cellulose fibers and does not have quinoa protein fiber composite material. The invention comprises the step of modifying the quinoa protein liquid by sequentially adopting sodium hexadecyl sulfonate and trimethylolpropane trimethacrylate to obtain the modified quinoa protein liquid. The content and purity of the quinoa protein extracted by the method are suitable for being compounded with cellulose fibers, and the obtained quinoa protein composite fiber has the advantages of high protein content, high breaking strength and the like.)

1. A preparation method of a quinoa protein liquid for fiber compounding is characterized in that the quinoa protein liquid is modified by sequentially adopting sodium hexadecyl sulfonate and trimethylolpropane trimethacrylate to obtain the modified quinoa protein liquid.

2. The method for preparing a quinoa protein solution for fiber compounding as claimed in claim 1, wherein the amount of said sodium hexadecyl sulfonate added is 3-10% of said quinoa protein solution, and the amount of said trimethylolpropane trimethacrylate added is 2-10% of said quinoa protein solution.

3. The method for preparing quinoa protein according to claim 1, wherein the reaction temperature of said quinoa protein solution with sodium hexadecyl sulfonate is 50-60 ℃ and the reaction time is at least 1h, and the reaction temperature of said quinoa protein solution with trimethylolpropane trimethacrylate is 70-80 ℃ and the reaction time is at least 1 h.

4. The method for preparing quinoa protein according to claim 1 or 2, wherein the method for preparing quinoa protein solution comprises the following steps: the method comprises the steps of firstly carrying out primary enzymolysis on quinoa dispersed pulp by adopting alkaline protease, then carrying out secondary enzymolysis on the quinoa by adopting amylase and digestive enzyme to obtain quinoa protein pulp, and drying the quinoa protein pulp to obtain the quinoa protein powder.

5. The method for preparing quinoa protein according to claim 4, wherein the quinoa is pretreated before enzymolysis, and the pretreatment method comprises the following steps: swelling with hot water, removing water, and mixing and grinding with volatile alcohol to obtain the quinoa dispersed slurry.

6. The method of claim 5, wherein the pH of the quinoa protein slurry is adjusted to alkaline with an alkaline solution, alkaline protease is added for hydrolysis to obtain a quinoa protein slurry, the pH of the quinoa protein slurry is adjusted to neutral with an acid, and amylase and digestive enzyme are added to obtain the quinoa protein slurry.

7. The method for preparing quinoa protein according to claim 4, wherein said quinoa protein powder is dissolved in a solvent and an alkali solution and subjected to multiple purifications to obtain said quinoa protein solution, said purifications including centrifugation and pressure filtration.

8. The method for preparing quinoa protein according to claim 7, wherein said purification comprises the following steps: mixing quinoa protein powder and ethanol at a ratio of 1:2-8, dissolving in 50-85 deg.C alkali solution, centrifuging, and filtering with plate-and-frame filter to obtain quinoa protein solution.

9. A method for preparing quinoa protein fiber, characterized in that the modified quinoa protein liquid of any one of claims 1 to 8 is subjected to cross-linking reaction with sodium carboxymethylcellulose to obtain quinoa protein cross-linking liquid.

10. The method of claim 9, wherein the quinoa protein cross-linking solution and the viscose spinning solution are subjected to primary defoaming, and the quinoa protein cross-linking solution and the viscose spinning solution after the primary defoaming are mixed and then subjected to secondary defoaming.

Technical Field

The invention relates to the technical field of functional cellulose fibers, and particularly relates to a quinoa protein liquid and a preparation method of quinoa protein fibers thereof.

Background

Chenopodium quinoa is a plant of the genus Chenopodium of the family Chenopodiaceae. The ear part can be red, purple or yellow, the shape of the plant is similar to that of the grey lima vegetable, and the ear part is similar to that of the sorghum after the plant is mature. Is native to high-altitude mountain areas such as Columbia, Ecuador, Peru, etc. of Andes mountain in south America. Has certain drought resistance, cold resistance and salt tolerance. The quinoa is rich in vitamins, polyphenols, flavonoids, saponins and phytosterols, and has various health effects. Quinoa has high protein, the main components of quinoa protein are albumin and globulin, and the molecular structures of quinoa protein and globulin are more stable due to the action of disulfide bonds. Quinoa protein is a whole-protein food, contains almost all natural amino acids, especially contains 8 amino acids essential to human body and histidine essential to infants, and has balanced proportion.

The regenerated cellulose fiber is produced by using natural cellulose (cotton, hemp, bamboo, tree, shrub) as a raw material, and only changing the physical structure of the natural cellulose without changing the chemical structure of the natural cellulose. Active hydroxyl exists on cellulose molecules, so that each link in the production of the regenerated cellulose fiber can be grafted and copolymerized with other molecules for combined modification.

The quinoa protein and the regenerated cellulose fiber are compounded to obtain a spinning product beneficial to human health, but no related technology exists at present, and no extraction and modification method of quinoa protein liquid capable of being well combined with the regenerated cellulose fiber exists.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the existing extraction and modification method of quinoa protein is not suitable for being combined with regenerated cellulose fiber.

The invention is realized by the following technical scheme:

a preparation method of quinoa protein liquid for fiber compounding comprises modifying quinoa protein liquid with sodium hexadecyl sulfonate and trimethylolpropane trimethacrylate successively to obtain modified quinoa protein liquid.

In the invention, the quinoa protein and the regenerated cellulose fiber are compounded, and the requirements on the dispersibility of the quinoa protein liquid and the crosslinking property of the quinoa protein liquid and the regenerated cellulose fiber are high, so that the quinoa protein liquid is dispersed by using sodium hexadecyl sulfonate to prevent the quinoa protein liquid from agglomerating and coagulating, and then the quinoa protein liquid is modified by using trimethylolpropane trimethacrylate, and the trimethylolpropane trimethacrylate has thickening and crosslinking effects, so that the quinoa protein liquid is ensured to have certain viscosity, and the crosslinking effect is provided for the subsequent reaction with the regenerated cellulose.

The invention preferably discloses a preparation method of quinoa protein liquid for fiber compounding, wherein the addition amount of sodium hexadecyl sulfonate is 3-10% of the quinoa protein liquid, and the addition amount of trimethylolpropane trimethacrylate is 2-10% of the quinoa protein liquid.

The invention preferably discloses a preparation method of quinoa protein liquid for fiber compounding, wherein the reaction temperature of the quinoa protein liquid and sodium hexadecyl sulfonate is 50-60 ℃, the reaction time is at least 1h, the reaction temperature of the quinoa protein liquid and trimethylolpropane trimethacrylate is 70-80 ℃, and the reaction time is at least 1 h.

In the invention, the dispersion effect of the sodium hexadecylsulfonate is better under the thermal environment, so that 50-60 ℃ is selected and maintained for a period of time to keep the quinoa protein liquid uniform and stable, then the temperature is raised to 70-80 ℃ on the basis of 50-60 ℃, and trimethylolpropane trimethacrylate is added for crosslinking reaction.

The invention preferably discloses a preparation method of quinoa protein liquid for fiber compounding, which comprises the following steps: the method comprises the steps of firstly carrying out primary enzymolysis on quinoa dispersed pulp by adopting alkaline protease, then carrying out secondary enzymolysis on the quinoa by adopting amylase and digestive enzyme to obtain quinoa protein pulp, and drying the quinoa protein pulp to obtain the quinoa protein powder.

The invention preferably discloses a preparation method of quinoa protein liquid for fiber compounding, wherein quinoa is pretreated before enzymolysis, and the pretreatment method comprises the following steps: swelling with hot water, removing water, and mixing and grinding with volatile alcohol to obtain the quinoa dispersed slurry.

The invention preferably discloses a preparation method of a quinoa protein liquid for fiber compounding, wherein the pH of quinoa is adjusted to 9-11 by adopting alkali liquor, alkaline protease is added for hydrolysis to obtain quinoa protein primary slurry, the pH of the quinoa protein primary slurry is adjusted to be neutral by adopting acid, and amylase and digestive enzyme are added to obtain the quinoa protein slurry.

The invention adopts an environment-friendly and harmless enzymolysis method, and in order to ensure that the protein in the quinoa can be fully hydrolyzed and released, hot water is firstly used for swelling, and then the quinoa is adopted: grinding the chenopodium quinoa protein solution according to the proportion of 1:2-8, then carrying out enzymolysis, and carrying out secondary enzymolysis by using amylase and digestive enzyme after carrying out primary enzymolysis treatment by using alkaline protease and then adjusting the pH to be neutral along with the gradual hydrolysis of the chenopodium quinoa protein, so that the protein in the chenopodium quinoa can be fully hydrolyzed, and carrying out spray drying to obtain the chenopodium quinoa protein powder after the hydrolysis is finished.

The invention preferably discloses a preparation method of quinoa protein liquid for fiber compounding, which is characterized in that quinoa protein powder is dissolved in a solvent and alkali liquor and is subjected to multiple purification to obtain the quinoa protein liquid, wherein the purification comprises centrifugation and filter pressing.

The invention preferably discloses a preparation method of quinoa protein liquid for fiber compounding, which comprises the following specific steps of: mixing quinoa protein powder and ethanol at a ratio of 1:2-8, dissolving in 50-85 deg.C alkali solution, centrifuging, and filtering with plate-and-frame filter to obtain quinoa protein solution.

The temperature profile of dissolution was: raising the temperature to 60 ℃ at the room temperature at the speed of 2 ℃/min, preserving the heat for 0.5 to 2 hours, and raising the temperature to 80 to 85 ℃ at the speed of 5 ℃/min.

In order to obtain purer quinoa protein liquid, the quinoa protein powder obtained after enzymolysis drying is dissolved and purified again, the quinoa protein powder is mixed with ethanol and dissolved by sodium hydroxide solution under a reasonable temperature condition, the obtained quinoa protein dissolved solution is purified twice to finally obtain the purified quinoa protein liquid, at the moment, the purified quinoa protein liquid is dispersed by sodium hexadecylsulfonate and is subjected to cross-linking modification by trimethylolpropane trimethacrylate, and the quinoa protein liquid with the quinoa protein content of 10-50% and suitable for being compounded with regenerated cellulose fibers is finally obtained.

A method for preparing quinoa protein fiber comprises cross-linking modified quinoa protein solution and sodium carboxymethylcellulose to obtain quinoa protein cross-linked solution.

In order to improve the binding property of the quinoa protein and the regenerated cellulose fiber, the invention carries out cross-linking modification once again before the viscose is compounded, and particularly adopts sodium carboxymethyl cellulose for treatment, thereby further ensuring the stability of the solution, ensuring the viscosity of a protein liquid system, increasing the reaction of cellulose and protein, leading the protein to be utilized as much as possible and reducing the loss.

Further, the sodium carboxymethylcellulose is added in a mode of adopting a 1-3% sodium carboxymethylcellulose solution, wherein the sodium carboxymethylcellulose solution accounts for 2-8% of the quinoa protein solution by mass.

The preparation method of the quinoa protein fiber, which is preferred by the invention, is characterized in that the quinoa protein cross-linking solution and the viscose spinning solution are subjected to primary defoaming respectively, and the quinoa protein cross-linking solution subjected to primary defoaming and the viscose spinning solution are mixed and then subjected to secondary defoaming.

In order to reduce bubbles and improve the strength of fibers, the invention adopts a twice defoaming process, wherein once, the quinoa protein crosslinking solution and the viscose spinning solution are respectively defoamed, and then the quinoa protein crosslinking solution and the viscose spinning solution are mixed for twice defoaming, and the quinoa protein solution: the volume ratio of the viscose is 15-40%.

The quinoa protein liquid and the viscose adopt a two-bath wet spinning method, the defoamed viscose liquid containing the quinoa protein is fed into a spinning machine through a glue supply pipeline, is quantitatively fed by a metering pump, is filtered out again by a candle filter to remove particle impurities, and is fed into a spinneret assembly through a bent pipe. The adhesive is passed under pressure through a plurality of orifices to form a plurality of adhesive streamlets.

Solidifying and solidifying the viscose filaments: after the viscose flows out, the viscose enters a coagulating bath and is coagulated and formed into primary filaments by the coagulating bath which contains 360g/L of sodium sulfate-containing 250-one, 80-130g/L of sulfuric acid, 10-50g/L of zinc sulfate, 8-25g/L of auxiliary agent, 1.25-1.32 of specific gravity and 40-60 ℃ of temperature. The primary silk thread is sent by a silk guide disc to be bundled and drawn, in a curing bath, the primary silk thread is drawn and simultaneously finally finishes the decomposition and regeneration process, the structure and the performance of the fiber are basically shaped, and simultaneously, the silkworm pupa protein is fixed on the surface of the cellulose to form a stable skin-core structure.

And (3) carrying out post-treatment on the solidified spinning:

and cutting the fiber bundles according to a certain specification, and then carrying out acid washing, desulfurization, water washing, acid washing, water washing, oiling, dehydration and drying to obtain the quinoa protein viscose fiber.

The invention has the following advantages and beneficial effects:

1. the quinoa protein liquid is dispersed by using the sodium hexadecyl sulfonate to prevent the quinoa protein liquid from agglomerating and coagulating, and then is modified by using the trimethylolpropane trimethacrylate, wherein the trimethylolpropane trimethacrylate plays roles in thickening and crosslinking, so that the quinoa protein liquid is ensured to have certain viscosity, and a crosslinking effect is provided for the subsequent reaction with regenerated cellulose.

2. The invention adopts an environment-friendly and harmless enzymolysis method, and in order to fully hydrolyze and release the protein in the chenopodium quinoa willd, hot water is firstly used for swelling, then the chenopodium quinoa willd is ground, and then the enzymolysis is carried out for two times, so that the protein in the chenopodium quinoa willd can be fully hydrolyzed.

3. The quinoa protein liquid extracted by the method has high content and purity, is matched with dispersion and crosslinking reaction, has good binding property with cellulose fibers, and has high protein content and breaking strength.

4. According to the invention, the quinoa protein liquid is subjected to primary cross-linking modification by adopting sodium carboxymethylcellulose before spinning, and the quinoa protein fiber with higher protein content and fiber breaking strength is obtained through secondary defoaming.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not used as limitations of the present invention.

Example 1

A preparation method of quinoa protein comprises the following steps:

step 1: quinoa pretreatment

Continuously stirring and rinsing quinoa with pure water, draining, soaking in hot water for 5h, drying in an oven, adding ethanol, stirring, and grinding in a grinder at a ratio of 1: 5;

step 2: enzymolysis

Adjusting the pH value to 9.5-10.5 by using sodium hydroxide, adding 8% of alkaline protease into the quinoa protein slurry for hydrolysis, keeping the temperature at 30-35 ℃ for 2 hours to obtain a quinoa protein primary slurry preliminarily, adjusting the pH value to 6.5-7.5 by using dilute acetic acid, adding 8% of amylase and digestive enzyme, wherein the mass ratio of the amylase to the digestive enzyme is 1:1, keeping the temperature at 30-35 ℃, fully reacting for 2 hours, and performing spray drying on the obtained protein solution to obtain the high-purity quinoa protein powder.

And step 3: modification of crosslinking

Mixing quinoa protein powder and ethanol according to a ratio of 1:5, and fully dissolving in a 3% sodium hydroxide solution, wherein a specific dissolving temperature curve is as follows: raising the temperature to 60 ℃ at the room temperature at the speed of 2 ℃/min, preserving heat for 2h, in order to ensure that the quinoa protein powder is fully swelled and dissolved, facilitating the subsequent rapid dissolution, raising the temperature to 80-85 ℃ at the speed of 5 ℃/min, preserving heat for 1h, destroying the molecular chain structure to ensure that the protein is fully dissolved rapidly, filtering the dissolved protein liquid by using a centrifugal machine at the rotating speed of 6000 r/min, filtering for 6 min, and performing secondary filtration by using a plate-and-frame filter, wherein the aperture of filter cloth for plate-and-frame filter pressing is 600 meshes and 1300 meshes.

Heating the filtered filtrate, namely quinoa protein liquid, to 50-60 ℃, adding 6% sodium hexadecyl sulfonate, uniformly stirring, and reacting for 2 hours; and then raising the temperature to 70-80 ℃, adding 6% trimethylolpropane trimethacrylate, uniformly stirring, reacting for 2 hours, and uniformly stirring to obtain the quinoa protein liquid with the protein content of 25%.

A preparation method of quinoa protein fiber comprises the following steps:

step S1: secondary crosslinking modification of quinoa protein liquid

Slowly adding a 2% sodium carboxymethylcellulose solution into the quinoa protein solution by a meter, wherein the mass ratio of the sodium carboxymethylcellulose solution to the quinoa protein solution is respectively 0.06: 1, uniformly mixing by using a stirrer. Carrying out primary defoaming on the mixed quinoa protein liquid and the viscose spinning solution respectively, then conveying the quinoa protein liquid and the viscose spinning solution to a pre-spinning process respectively by a metering pump and a supply system in proportion for static mixing, and carrying out secondary defoaming again, wherein the mixing ratio of the quinoa protein liquid to the viscose spinning solution is as follows: the volume ratio of the viscose is 25%.

Step S2: spinning

The method adopts a two-bath wet spinning method, the defoamed viscose containing the quinoa protein is fed into a spinning machine through a viscose supply pipeline, is quantitatively fed through a metering pump, is filtered out again for particle impurities through a candle filter, is fed into a spinneret assembly through a bent pipe, and the viscose passes through a plurality of spinneret holes under pressure to form a plurality of viscose trickles.

Step S3: solidification and solidification

After the viscose flows out, the viscose enters a coagulating bath, and is coagulated and formed into primary filaments by the coagulating bath with 300g/L of sodium sulfate, 100g/L of sulfuric acid, 30g/L of zinc sulfate, 18g/L of auxiliary agent, 1.31 of specific gravity and 50 ℃. The primary silk thread is sent by a silk guide disc to be bundled and drawn, in a curing bath, the primary silk thread is drawn and simultaneously finally finishes the decomposition and regeneration process, the structure and the performance of the fiber are basically shaped, and simultaneously, the silkworm pupa protein is fixed on the surface of the cellulose to form a stable skin-core structure.

Step S4: post-treatment

And cutting the fiber bundles according to a certain specification, and then carrying out acid washing, desulfurization, water washing, acid washing, water washing, oiling, dehydration and drying to obtain the quinoa protein viscose fiber.

Example 2

A preparation method of quinoa protein comprises the following steps:

step 1: quinoa pretreatment

Continuously stirring and rinsing quinoa with pure water, draining, soaking in hot water for 3h, drying in an oven, adding ethanol, stirring, and grinding in a grinder at a ratio of 1: 5;

step 2: enzymolysis

Adjusting pH to 9.5 with sodium hydroxide, adding alkaline protease of quinoa protein slurry 0.05, hydrolyzing, maintaining the temperature at 30-35 deg.C to obtain quinoa protein primary slurry, adjusting pH to 6.5-7.5 with dilute acetic acid, adding amylase and digestive enzyme, maintaining the temperature at 30-35 deg.C, reacting for 3 hr, and spray drying the obtained protein solution to obtain high-purity quinoa protein powder.

And step 3: modification of crosslinking

Mixing quinoa protein powder and ethanol according to a ratio of 1:5, and fully dissolving by adopting a 0.8% sodium hydroxide solution, wherein a specific dissolving temperature curve is as follows: raising the temperature to 60 ℃ at the room temperature at the speed of 2 ℃/min, preserving the heat for 0.5h, raising the temperature to 80-85 ℃ at the speed of 5 ℃/min, filtering the dissolved protein solution by using a centrifugal machine at the rotating speed of 3000 rpm for 3 min, and performing secondary filtration by using a plate and frame filter.

Heating the filtered filtrate, namely quinoa protein liquid, to 50-60 ℃, adding 3% sodium hexadecyl sulfonate, uniformly stirring, and reacting for 1 h; and then raising the temperature to 70-80 ℃, adding 2% trimethylolpropane trimethacrylate, uniformly stirring, reacting for 1h, and uniformly stirring to obtain the quinoa protein liquid with the protein content of 15%.

A preparation method of quinoa protein fiber comprises the following steps:

step S1: secondary crosslinking modification of quinoa protein liquid

Slowly adding 1% sodium carboxymethylcellulose solution into the quinoa protein solution by a meter, wherein the mass ratio of the sodium carboxymethylcellulose solution to the quinoa protein solution is respectively 0.02: 1, uniformly mixing by using a stirrer. Carrying out primary defoaming on the mixed quinoa protein liquid and the viscose spinning solution respectively, then conveying the quinoa protein liquid and the viscose spinning solution to a pre-spinning process respectively by a metering pump and a supply system in proportion for static mixing, and carrying out secondary defoaming again, wherein the mixing ratio of the quinoa protein liquid to the viscose spinning solution is as follows: the volume ratio of the viscose is 15%.

Step S2: spinning

The method adopts a two-bath wet spinning method, the defoamed viscose containing the quinoa protein is fed into a spinning machine through a viscose supply pipeline, is quantitatively fed through a metering pump, is filtered out again for particle impurities through a candle filter, is fed into a spinneret assembly through a bent pipe, and the viscose passes through a plurality of spinneret holes under pressure to form a plurality of viscose trickles.

Step S3: solidification and solidification

After the viscose flows out, the viscose enters a coagulating bath, and is coagulated and formed into primary filaments by the coagulating bath which contains 250g/L of sodium sulfate, 80g/L of sulfuric acid, 10g/L of zinc sulfate and 8g/L of auxiliary agent, has the specific gravity of 1.25 and the temperature of 40 ℃. The primary silk thread is sent by a silk guide disc to be bundled and drawn, in a curing bath, the primary silk thread is drawn and simultaneously finally finishes the decomposition and regeneration process, the structure and the performance of the fiber are basically shaped, and simultaneously, the silkworm pupa protein is fixed on the surface of the cellulose to form a stable skin-core structure.

Step S4: post-treatment

And cutting the fiber bundles according to a certain specification, and then carrying out acid washing, desulfurization, water washing, acid washing, water washing, oiling, dehydration and drying to obtain the quinoa protein viscose fiber.

Comparative example 1

The difference between the embodiment and the embodiment 1 is that the addition amount of the sodium hexadecyl sulfonate is 3 percent of the quinoa protein liquid, and the addition amount of the trimethylolpropane trimethacrylate is 2 percent of the quinoa protein liquid.

Comparative example 2

The difference between the embodiment and the embodiment 1 is that the addition amount of the sodium hexadecyl sulfonate is 10 percent of the quinoa protein liquid, and the addition amount of the trimethylolpropane trimethacrylate is 10 percent of the quinoa protein liquid.

Comparative example 3

This example differs from example 1 in that the 2% sodium carboxymethylcellulose solution was added in an amount of 4% of the quinoa protein solution.

Comparative example 4

This example differs from example 1 in that the 2% sodium carboxymethylcellulose solution was added in an amount of 8% of the quinoa protein solution.

Comparative example 5

The difference between the present example and example 1 is that the quinoa protein solution after enzymolysis is modified without adding sodium hexadecyl sulfonate and trimethylolpropane trimethacrylate.

Comparative example 6

The difference between the present example and example 1 is that the quinoa protein solution after primary modification is subjected to secondary crosslinking modification without adding a sodium carboxymethyl cellulose solution.

Comparative example 7

The difference between this example and example 1 is that only after the quinoa protein and the viscose spinning solution are mixed, primary defoaming is performed, and the quinoa protein crosslinking solution and the viscose spinning solution are not defoamed separately.

The protein content and the fiber breaking strength of the above examples and comparative examples were measured, and the results are shown in table 1 below:

TABLE 1 table of the performance test of samples obtained in different examples

As can be seen from the above table:

(1) after the quinoa protein liquid is subjected to primary modification and secondary modification, the protein content and the fiber breaking strength are high.

(2) The fiber breaking strength of the quinoa protein liquid after only one-time defoaming is lower than that of the fiber after two-time defoaming, which is mainly caused by unclean bubble in the fiber.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.