67 results about "Acid deposition" patented technology

The invention discloses a method for extracting and separating curcumin. The method comprises the following steps: (1) extraction: crushing curcuma longa, adding 2-10% alkaline water to extract to obtain an alkaline water extracting solution; (2) degreasing: adding an organic solvent petroleum ether, 6# solvent oil, cyclohexane, benzene, methylbenzene or ethyl acetate into the alkaline water extracting solution, stirring and extracting for 1-2h, and then, standing for 1-2h to separate out an organic layer; (3) acid deposition: regulating the pH value of the extracting solution to 1-2 by using hydrochloric acid to separate out the curcumin, filtering, and drying to constant weight to obtain a crude product of the curcumin; and (4) dissolving the crude product of the curcumin by using an organic solvent methanol, ethanol, acetone, n-butanol or isopropanol, filtering, adding distilled water into the filtrate, carrying out freezing crystallization at the temperature of 0-5 DEG C for 2-8h, filtering, and drying to obtain a curcumin product. The method is low in production cost; the prepared curcumin product is high in purity up to over 98.5%.

The invention discloses a method for extracting nickel and molybdenum by a nickel-molybdenum ore all-wet method, relating to the smelting of nonferrous metals by a wet method, in particular to a all-wet method for extracting nickel and molybdenum from nickel-molybdenum ores of black rock series. The method is characterized in that during extraction process, pressure oxidation leaching is carried out to the nickel-molybdenum ores milled, thus obtaining a nickel leaching solution containing nickel and molybdenum and leaching slag containing molybdenum oxides; the leaching solution undergoes extraction for separating nickel and molybdenum, thus producing nickel salt and ammonium molybdate or molybdenum trioxide; alkali steeping in a normal pressure, purification and ammonium molybdate acid deposition are carried out to molybdenum contained in the leaching slag for recycling. The method of the invention has high nickel and molybdenum recycling rate, low production cost and environmentally friendly production process.

The invention relates to a preparation method of square tungsten oxide nano powder, belonging to the field of inorganic non-metallic materials. The content thereof is as follows: tungstenic acid deposition obtained by the reaction of sodium tungstate and hydrochloric acid is used as a precursor, citric acid is used as an auxiliary reagent, hydrochloric acid is used to adjust pH value and nano tungsten oxide is grown in a high-pressure autoclave by heating. Heating mode can be microwave heating and resistance wire heating, and the nanocrystalline grown is square. The characteristic of the square tungsten oxide powder material is that: the size of the square tungsten oxide is between 80 and 150nm. The advantages of the method are that: the process is simple, the cost is low and the shape and size of the tungsten oxide crystal are hydrothermally controlled by the citric acid auxiliary.

The invention discloses a method for simultaneously extracting soybean peptide and soybean oligosaccharide from an aqueous phase produced through the aqueous enzymatic method and belongs to the technology of gain and oil bioprocessing. The method comprises the following steps: (1) soybeans are extruded and puffed, and then mixed with water for enzymolysis, and centrifugal separation is performed after enzymolysis, so that free oil, an emulsion, a hydrolysate and residues are obtained; (2) the emulsion, the hydrolysate and the residues are subjected to ultrasonic treatment to obtain a mixed liquor, two types of alkaline protease are added into the mixed liquor for step-by-step enzymolysis, centrifugal separation is performed after enzymolysis, so that free oil, an aqueous phase waste liquor and residues are obtained; (3) the acid deposition is performed on the aqueous phase waste liquor and then centrifugal separation is performed on the aqueous phase waste liquor to obtain sediment and aqueous phase mixture, and the sediment is subjected to vacuum concentration and spray drying to obtain soybean peptide; nanofiltration and ethanol precipitation are performed on the aqueous phase mixture to obtain sediment, and the sediment is subjected to decolorization and desalination treatment, and then subjected to vacuum concentration and spray drying to obtain the soybean oligosaccharide. According to the method, the aqueous phase mixed system formed during oil production through the aqueous enzymatic method is fully utilized, so that the waste is reduced, and the soybean peptide and the soybean oligosaccharide can be simultaneously obtained; the method has an excellent application prospect.

The invention provides a preparation method of stable water-soluble niobium and tantalum precursor, which comprises using pentoxide of tantalum or niobium as raw material, mixing columbium pentachloride or ttantalum pentachloride with potassium hydroxide or sodium hydroxide, grinding homogeneously, carrying out incandesce reacting 2-4 hours at 400-550 deg. C, obtaining fusing agent of potassium (sodium) niobate or potassium (sodium) tantalite, dissolving the fluxing agent into deionized water, filtering the solution till the solution shows strong acidity (pH<2), so that the niobium or tantalum in the solution can be fully precipitated in the form of niobic acid or tantalic acid. Finally charging right amount of citric acid water solution into columbic acid or charging right amount of oxalic acid into tantalic acid deposition, thus obtaining water-soluble niobium precursor or oxalate aqueous solution of tantalum.

The invention relates to a method for comprehensively extracting effective ingredients in tea. The method comprises the following steps of: with a faintly acidic water solution as a main extraction solvent and a certain amount of organic solvent as an auxiliary extraction solvent, carrying out step-by-step extraction on water extracts to obtain four effective ingredients, namely tea polyphenol, caffeine, tea polysaccharide and theanine; and meanwhile, extracting tea protein from tea residues by using an alkali dissolution and acid deposition method. According to the method, as water is used as the main solvent, the cost is low, the reactions are mild and active ingredients are favorably preserved; as a certain amount of organic solvent is used as the auxiliary extraction solvent, the problems of overhigh cost and product pollution caused by use of a large amount of organic solvents are solved; meanwhile, five effective ingredients, namely the tea polyphenol, the tea polysaccharide, the caffeine, the theanine and the tea protein are extracted, and therefore high extraction rate, high purity and high utilization rate of tea are achieved; the solvents are recycled in the extraction process, so that the preparation cost is reduced; and no alkali and acid waste liquor is discharged in the overall process, and therefore the method is environment-friendly. The overall preparation flow is high in efficiency and low in cost, and therefore the method has a favorable application value.

The invention provides a method for preparing a gardenia red pigment by using an immobilized enzyme, which comprises the following steps of: using geniposide as a raw material; performing alkaline hydrolysis and acidification on the raw material, and adding the immobilized enzyme into the raw material to perform enzymolysis; filtering the mixture to obtain enzymolysis solution; adding a primary amino compound into the enzymolysis into to perform a reaction; filtering the mixture to obtain solution of the gardenia red pigment; and performing acid deposition, deposition washing neutralization, dehydration and drying on the solution of the gardenia red pigment to obtain the gardenia red pigment. The method has the advantages that: an enzyme preparation can be recycled, the reaction condition is mild, an acid deposition method is adopted to perform enrichment, the process is simple, the energy consumption is low, and a product can be separated easily. The gardenia red pigment prepared by the method can obviously reduce the production cost. The product has the maximum absorption of 530 nm, has high water-solubility and high light, heat, acid, alkali and metal ion stability, and is favorable for widening the application range of the gardenia red pigment.

The invention relates to the field of selenium-rich rice byproducts, and in particular relates to a preparation method of rice bran selenoprotein powder. The method comprises the following steps of: grinding, screening and degreasing byproduct rice bran obtained after rice processing to prepare rough rice bran into degreased rice bran, mixing 60%-70% alcohol with the degreased rice bran in the material-liquid ratio of (1:3)-(1:5), stirring on a magnetic force mixing machine for a certain period of time, and centrifuging, wherein the processes are repeated for three times; and carrying out alkaline extraction with 0.02-0.1mol / L NaOH solution for 1-3 hours in the material-liquid ratio of (1:10)-(1:20) at the temperature of 30-40 DEG C, taking supernate after centrifuging, decolorizing with active carbon, adjusting an isoelectric point by utilizing a acetic acid-natrium aceticum buffer solution for acid deposition, then centrifuging, and freezing to dry after washing, thereby obtaining the rice bran selenoprotein powder with the protein extraction ratio of 60-80%, and the selenium content of 0.2-0.3mg / kg finally. The selenoprotein powder provided by the invention is natural in nutritional ingredient, is rich in trace element selenium, keeps the original nutrition ingredients in the rice bran selenoprotein powder effectively, and is suitably used as a food auxiliary material or a nutrition enhancer.

The invention belongs to the technical field of natural medicine extraction and particularly relates to a method for obtaining hesperidin. According to the method, the rutaceous plant fructus aurantii immaturus serves as the raw material, impurities are removed with a cold-maceration method, coarse crystals are separated out with an alkali dissolution and acid deposition method, secondary crystallization is carried out with alkali sodium alkoxide, and hesperidin is obtained. By means of the method, waste of the raw material can be fully reduced, environment pollution is reduced, hesperidin in fructus aurantii immaturus can be efficiently extracted and separated, and a very good technical effect is achieved.

A soybean protein in the form of gel is prepared from the low-temp deoiled soybean dregs through heating for deactivating lipoxidase to obtain a suspension, regulating temp and pH value, alkali dissolving, acid deposition and separating gel from liquid.

The invention relates to a production method for extracting and separating protein from rice bran, and effectively solves extraction and separation of protein from the rice bran so as to meet healthy diet requirements from people. The technical proposal is that the method comprises the following procedures: (1) bran and crushed rice separation, (2) granulation, (3) drying, (4) leaching, (5) low-temperature precipitation, (6) primary extraction of defatted cake, (7) primary separation, (8) secondary extraction, (9) secondary separation, (10) acid deposition, (11) curd separation, (12) neutralization, (13) sterilization, (14) pressurization, spray drying and (15) packaging. The method has the advantages of realizing integrated scale production from rice bran to protein extraction from the rice bran, providing good technology and new method for deep-processing of the rice bran, effectively solving technical problem of industrialized protein separation from the rice bran, meeting human protein requirements in diet, and has great economic and social benefits.

The invention relates to a sanitarian edible protein and a processing process thereof, belonging to the technical field of edible proteins and extraction processes thereof. The process comprises the steps of extraction of pea vermicelli wastewater, centrifugal separation, extraction of pea slag for the second and third time, enzymolysis, acid deposition, centrifugation, washing, centrifugation and syrup mixing for neutralization. By using the processing process for extracting the edible protein from vermicelli wastewater, the original method for producing proteins by boiling the vermicelli wastewater through a big pan is changed and the recovery rate of proteins is increased. The invention has the advantages of changing original feed proteins into edible proteins with high added values, increasing enterprise revenue, improving comprehensive utilization of resources and reducing COD (Chemical Oxygen Demand) content in wastewater to better treat the wastewater so as to reduce the difficulty of wastewater treatment. Edible pea proteins obtained through the process have the functions of gel property of protein, water absorbability, oil absorbency, and the like and can be added into a plurality of kinds of foods to increase the protein content of the foods and change the property of the foods.

The invention discloses a method for separating and purifying phellodendrine monomer, which comprises the following steps of: extracting total alkaloid; removing berberine by means of acid deposition; filtering and further removing; separating phellodendrine monomer through a preparative high-efficiency liquid chromatogram; extracting dichloromethane; and drying to prepare the phellodendrine monomer. The method has simple operation, short preparation period, high separation efficiency, stable technology and low cost, and can separate the large number of phellodendrine monomer with high purity to obtain the phellodendrine monomer, the purity of which is more than 98%.

The invention discloses a micro-wave extraction process of lotus seed protein. High purified lotus seed protein powder is obtained through salt extraction, acid deposition, centrifugation and spray-drying under the radiation of microwave. The invention transfers energy which is directly reacted on lotus powder through utilize microwave radiation, and lotus powder is fiercely moved, which can significantly increases extraction speed ratio, shortens extraction time, reduces energy consumption, CO2 and water can form carbonic acid with 1-6atm acid deposition pressure, lotus seed protein is deposited by carbonic acid, thereby no generating waste water, gas and residual. The obtaining rate of protein powder is 26.1 % through the combination of microwave salt extraction and acid deposition, and protein purity in the lotus seed protein powder is high, which can reach 86.2%, and color and taste are excellent.

The invention discloses a method for separating beta-lactoglobulin from raw milk. The method comprises the following steps: with fresh cow's milk as a processing object, carrying out centrifugation and degreasing so as to obtain skim milk; adding an acid to adjust the pH value of the skim milk, standing the skim milk for a certain period of time and then removing casein through centrifugation; adjusting the pH value of a solution so as to allow the solution to be acidic, adding a salt, standing the solution for a certain period of time, then carrying out centrifugation and collecting supernatant; adjusting the pH value of the supernatant, adding a sodium salt, carrying out centrifugation after standing and collecting precipitate; flushing the precipitate and then dissolving the precipitate in a PBS buffer solution; carrying out ultrafiltration on the solution to remove salt and carrying out freeze-drying; and identifying beta-lactoglobulin by using sodium dodecanesulphonate-polyacrylamide gel electrophoresis and quantifying purity by using reverse-phase chromatography. According to the method provided in the invention, beta-lactoglobulin can be separated from fresh cow's milk through acid deposition and salt precipitation, and desalting through ultrafiltration is combinedly used so as to obtain high purity beta-lactoglobulin. The method improves separation efficiency of beta-lactoglobulin and provides a high-quality raw material for research on other aspects of and application of beta-lactoglobulin.

The invention relates to a preparation method for alkaline phosphatase, which mainly comprises the following steps: rubbing and centrifuging the abandoned visceral organs after an animal is slaughtered, thereby obtaining coarse alkaline phosphatase liquid, and then performing the processes of acid deposition, salting-out, column chromatography, dialysis and vacuum freeze drying, thereby finally obtaining the alkaline phosphatase, wherein the specific enzymic activity of the alkaline phosphatase is above 402U / mg. The recovery rate of the alkaline phosphatase prepared according to the preparation method is above 10%; the purifying times is above 1297 times; the whole process has the advantages of short period, typical production equipment, simple operation process, low cost, high efficiency, high product purity, and the like; and the preparation method is suitable for popularization.

The invention provides a bioactive peptide derived from rice bran glutelin, wherein the sequence of the bioactive peptide is shown as KHNRGDEF. The active peptide provided by the invention, which has an antioxidant activity, can be used for preparing foods and health care products capable of enhancing antioxidant efficacy. A polypeptide, which has an antioxidant activity in vitro, is separated from an enzymatic hydrolysate of the rice bran glutelin; an antioxidant active peptide product is prepared by extracting crude glutelin by virtue of a method of alkaline extraction and acid deposition, then conducting sequential extraction, separating and purifying the rice bran glutelin by virtue of ion-exchange chromatography and gel chromatography technologies, hydrolyzing obtained rice bran glutelin by virtue of alkaline protease, and conducting centrifuging, vacuum concentration and freeze-drying, wherein the rice bran glutelin is enzymatically hydrolyzed under the following conditions: an [E] / [S] ratio is 1.5% 1.8%, a pH value is 10.0, a temperature is at 50 DEG C and a duration is 4.2h; and a required antioxidant active peptide pure product is prepared by conducting ion-exchange chromatography and gel chromatography, preparing RP HPLC and analytical RP HPLC, and conducting separating and purifying. A separation and preparation method provided by the invention is low in production cost, simple and convenient in process and is green and environmentally friendly; the prepared rice bran active peptide has the characteristics of being reasonable in amino acid composition, low in allergy, safe and reliable, and the like; and the rice bran active peptide is relatively good in free radical scavenging capacity and excellent in antioxidant efficacy.

The invention provides a process for preparing concentration type Shuanghuanglian oral liquid preparation, wherein the preparation comprises flower of honeysuckle, baikal skullcap root and capsule of weeping forsythia. The preparing process comprises acid deposition, alcohol deposition, pH adjustment, extraction, and high speed centrifuging.

The invention belongs to the technical field of cosmetics, and specifically relates to a firming and revitalizing night cream containing pumpkin seed polypeptide, an anti-aging emulsion and a leave-in conditioner, and also relates to a preparation method of the pumpkin seed polypeptide and the above cosmetics. Pumpkin seed polypeptide includes pumpkin seed crude polypeptide and pumpkin seed purified polypeptide. The polypeptide is prepared by desalting with DA-201C macroporous adsorption resin, eluting with 75% ethanol-water solution, and freeze-drying. The amino acids in pumpkin seed peptides are rich in types and have antioxidant activity. The firming and revitalizing night cream contains 0.2-3% of pumpkin seed purified polypeptide, the anti-aging lotion contains 0.5-5% of pumpkin seed purified polypeptide, and the leave-in conditioner contains 1-5% of pumpkin seed crude polypeptide. The invention provides the application of high economic added value for the pumpkin seed meal, and the sensory evaluation results of the prepared cream, lotion and hair conditioner show that the skin care and hair care effects are remarkable.

The invention relates to keratin solid and a preparation method thereof. The preparation method of the keratin solid comprises first washing hair and removing impurities; placing the purified hair in alkaline liquid to dissolve to obtain hair protein solution; slowly adding diluted hydrochloric acid with the concentration of 15-20% into the well dissolved hair protein solution with stirring, and performing neutralization to enable the pH to be 8 to 10; removing solid impurities which are over 5 mu m by centrifugal separation, obtaining the pure hair protein solution, and cooling; slowing adding diluted hydrochloric acid with the concentration of 7-10% with stirring after filtrate is cooled to be below 35 DEG C, adjusting the pH to be 4.0 to 4.5, and enabling the hair protein to be full precipitated until light yellow clear liquid occurs on the upper portion of the solution; and separating the protein, and obtaining the hair keratin solid. The preparation method of the keratin solid is simple and practical, the low-cost method for preparing the keratin solid by alkali dissolving and acid deposition separation is adopted, the prepared keratin solid can be directly used for spinning keratin composite fiber without drying, or keratin solid powder is obtained by drying and smashing to be used for other industrial purposes.

The invention discloses a method for preparing a high-temperature-resistant nanocrystalline nickel-cobalt coating on the surface of a copper alloy. The method comprises is characterized in that high-temperature-resistant nanocrystalline nickel-cobalt coating is prepared by adopting a free particle-assisted friction electrodeposition technology; the free particle-assisted friction electrodepositiontechnology is characterized in that ZrO2 ceramic particles are added into a deposition tank filled with an acid deposition solution, and then the copper alloy serving as the cathode is placed in thedeposition tank for reciprocating movement, so that the nickel-cobalt coating is deposited on the surface of the copper alloy; the formula of the acid deposition solution is characterize in that nickel sulfate is 220-250g / L, cobalt sulfate is 30-50g / L, nickel chloride is 45-60g / L, boric acid is 40-60g / L, and the pH value is equal to 4.0-5.0. According to the method for preparing the high-temperature-resistant nanocrystalline nickel-cobalt coating on the surface of the copper alloy, the acid deposition solution is selected for use, the ZrO2 ceramic particles are added into the acid deposition solution, by using relative movement formed by the ceramic particles and the copper alloy, the hydrogen evolution phenomenon can be greatly reduced, and the problems of pinholes, hard spots, nodulationand the like existing in the electrodeposition process are solve, so that the crystal grains are effectively refined, and the quality of the nickel-cobalt coating is finally improved.

The invention discloses separation of sihydroartemisinic acid from artemisinin production waste by means of alkali dissolution and acid deposition. The method comprises the following steps of: concentrating in vacuum to volatilize residual solvents in production waste liquid or waste paste by using the artemisinin production waste liquid or the waste paste as raw materials; ultrasonically extracting by using alkali solution; mixing extracting solution with one another and removing sediments to obtain supernate; adding acid solution into the supernate; collecting sediments; washing the sediments by using clean distilled water; freeze-drying to obtain a dry sihydroartemisinic product. A method for separating sihydroartemisinic from the artemisinin production waste is established at first, and then an ultrasonic-assisted extracting method is adopted, so that the extraction efficiency and the recovery rate are effectively improved; by utilizing a freeze-drying method, the problem of degradation of the sihydroartemisinic acid product caused in the traditional drying method is effectively solved; the purity of the product is more than 72 percent, and the recovery rate is more than 90 percent; moreover, the production capacity is high, and the industrialized production is easily realized.

The invention discloses a process for extracting and purifying the total organic acid of aralia cordata, which belongs to the technical field of pharmacy, and solves the technical problems of low extraction rate and low purity of the total organic acid of the aralia cordata. The process sequentially comprises the following steps: performing reflux extraction through ethyl alcohol; adding NaCl for salting-out; adding a low-valence / polarity organic solvent for extraction; adding KOH for alkaline treatment; adding concentrated hydrochloric acid for acid deposition; adding NaCl for salting-out; adding the low-valence organic solvent for extraction; performing concentration and drying under reduced pressure to obtain an extract of the total organic acid of the aralia cordata. An optimum aralia cordata organic acid extraction and purification scheme is adopted, so that the total organic acid in the edible aralia cordata can be extracted to the greatest extent, the usage rate of medicinal materials is increased, and the cost is saved; an extraction requirement does not need to be specifically required, and the extraction and purification process is stable, and easy to operate and the total organic acid is suitable for large-scale industrial production.

The invention relates to a method for preparing a monascus pigment, in particular to a method for preparing a monascus red pigment by utilizing immobilized enzymes. The method comprises the steps as follows: taking a monascus liquid fermentation solution as a raw material, homogenizing, enzymatically hydrolyzing the immobilized enzymes, alkalifying and filtering to obtain a monascus red pigment solution; and carrying out acid deposition on the monascus red pigment solution, washing and neutralizing the deposits, dehydrating and drying to obtain the monascus red pigment. The method has the advantages as follows: on one hand, the fermentation solution is effectively dispersed, broken, emulsified and mixed by utilizing a colloid mill, so that the subsequent enzymatic hydrolysis efficiency is improved and the monascus red pigment in monascus is fully released; and on the other hand, an enzyme preparation can be recycled, the reaction conditions are moderate, the monascus red pigment is concentrated through the acid deposition method, the process is simple, the energy consumption is low, and the product is easy to separate. The production cost can be remarkably reduced through the monascus red pigment prepared with the method. The monascus red pigment has the maximum absorption wavelength of 499 nm, is good in water solubility and light, heat, acid, alkali and metal stabilities, and is favorable for the monascus pigment industry development.

The invention discloses a preparation method of naringin. An alkali extraction and acid deposition method is adopted, young grapefruits are selected as a raw material, lime and NaOH are added in a certain solid-liquid ratio, stirring and extraction are performed at the normal temperature, the pH value of an extraction solution is adjusted with HCl acid, filtration is performed after flocculation treatment with CaCl2, filtrate obtained after filtration passes through a ceramic membrane system, an obtained dialysate is subjected to acid adjustment, crystals can be quickly separated under the stirring condition and dried, and the product naringin is obtained; naringin is recovered from a nanofiltration concentrated solution obtained after an acid dialysate is subjected to nanofiltration membrane treatment, and the nanofiltration dialysate is recycled for continuous raw material extraction. Macroporous resin adsorption and recrystallization are not required, the purity of naringin can reach 98% or above, the extraction rate is high, the yield of naringin is high, the product purity is high, steps of macroporous resin adsorption separation and recrystallization in traditional technologies are omitted, the process is simplified, the production cycle is shortened, besides, the amount of wastewater is greatly reduced, and the method is suitable for large-scale industrial production.

The invention discloses a method of separating and purifying capsaicin and dihydrocapsaicin from pepper fruits. The method comprises the following steps: performing supercritical carbon dioxide extraction of pepper fruits; performing reduced-pressure concentration to obtain capsicum oleoresin; performing methanol solution extraction and alkali extraction and acid deposition of the capsicum oleoresin to obtain a capsaicin substance crystal rich in capsaicin and dihydrocapsaicin; with n-hexane-ethyl acetate-methanol-water as a solvent system and high-speed counter-current chromatography (HSCCC)for preparation, monitoring the purity by high performance liquid chromatography; according to the HSCCC as well as the eluent with relatively high purity, performing reduced-pressure concentration and vacuum drying to obtain capsaicin with purity higher than 97.0% and dihydrocapsaicin with purity higher than 96.0%, wherein the extraction efficiencies of the capsaicin and the dihydrocapsaicin areboth higher than 93%, and the recovery rates are both higher than 70%. The method disclosed by the invention makes full use of the pepper seeds, has the advantages of easiness in operation, low cost,high repeatability, high efficiency and high product purity, and can be applied to large-scale production.

The invention discloses a method for preparing a debittered soybean sirup, which comprises the following steps: performing acid deposition by adding an acid for mixing so that the pH is between 3.5 and 5.0, preferably between 3.8 and 4.3; performing flocculation by adding a flocculating agent; and performing separation by separating solid matters and the liquid part, and connecting the solid matters and the liquid respectively, wherein the liquid part is the debittered soybean sirup. The invention also discloses the debittered soybean sirup prepared by the method and application thereof.

The invention discloses a preparation method for a flaxseed cake polypeptide beverage. The method employs flaxseed cake as a raw material and includes the following steps: adding cellulase for pre-treatment to release protein constrained by cellulose, and adding protease to prepare flaxseed cake polypeptide, and carrying out composition and sterilization to prepare the flaxseed cake polypeptide beverage. The flaxseed cake polypeptide is prepared through the enzymatic method to overcome the defects that an alkali extraction and acid deposition method is intensive in reaction conditions and is liable to cause environment pollution and an organic solvent method is complex in processes and high in cost. The enzymatic method for hydrolyzing the flaxseed cake polypeptide has mild reaction conditions, short reaction time and low energy consumption, and is easy to control in hydrolysis degree. The flaxseed cake polypeptide beverage has excellent color and flavor, is rich in nutrition, is easy to prepare and is reasonable in cost. The method is suitable for amplification, develops a new approach for deep-processing of flaxseed cake protein and provides a new product for beverage industry.

The invention provides lotus seed protein powder and a production method thereof. The production method comprises the following steps: 1. carrying out acceptance inspection on lotus seeds: picking fresh lotus seeds with shells, wherein 70%-80% of parts of the picked lotus seeds are matured; 2. crushing; 3. carrying out salt extraction, acid deposition and centrifugation: regulating the pH value of the extracted mixture to be 4.2 by using hydrochloric acid and sodium hydroxide; 4. performing stirring and centrifugal filtration; 5. carrying out ultrafiltration: carrying out ultrafiltration concentration on filtrate to obtain high-concentration protein; 6. drying the protein by a spray dryer to obtain finished protein powder product; and 7. packaging under a vacuum condition. Compared with the prior art, the lotus seed protein powder and the production method of the lotus seed protein powder have the beneficial effects that firstly, the lotus seed protein powder fully keeps the fresh scent, the color is changed from white to pale yellow, the lotus seed protein powder can be prepared into even paste by hot water and has fine and smooth mouthfeel; secondly, the production process of the lotus seed protein powder is simple and facilitates scale production, package, transportation and sale; thirdly, the lotus seed protein powder is convenient to store, and has shelf life up to 12 months at normal temperature.

The invention relates to a preparation method of flax protein powder. The method comprises the following steps: crushing defatted linseed meal, filtering by a 100-180-mesh sieve, taking siftage, and adding water which is over 10 times of the weight of the siftage to completely dissolve, so as to obtain a flax protein water liquid; adding an animal protein hydrolytic compound enzyme to the flax protein water liquid; oscillating in a water bath at 40-60 DEG C for 120 minutes; determining that the component of which the molecular weight is smaller than 2,000 accounts for 80-83% in flax protein hydrolysate by high performance liquid chromatography, wherein the main component is oligopeptides; filtering, and carrying out alkali dissolution and acid deposition on a filtered product; and freezing and drying the sediment to obtain the flax protein powder. The flax protein is extracted by adopting a method of combining an animal protein hydrolytic compound enzyme technology with an alkali dissolution and acid deposition method, so that the flax protein is separated out to the maximal extent, the extraction rate is 55.67%, and the protein content in the extracted flax protein is 93.77%.