Cotton-seed polypeptide dry powder production method with antioxidation
Technical field
The present invention relates to the processing method of cottonseed protein, specifically relate to utilize cottonseed protein to prepare and have the method for the polypeptide dry powder of antioxidation, polypeptide dry powder belongs to functional, nourishment food.
Background technology
Cotton Gossypii is one of important crops in the world, and Semen Gossypii is rich in albumen more than 30%, and its aminoacid is formed complete, and ratio is reasonable, and nutritive value is a kind of crucial plant protein resource near bean protein.Biologically active peptide is the polypeptide with amino acid sequence, and the vital movement of living organism is had special physiologically active.Some low peptide can not only provide the human body growth promoter required nutrient substance, and has the effect of preventing and curing diseases, regulating human physiological functions simultaneously, such as blood pressure lowering, cholesterol reducing, promote immunity and promote digesting and assimilating of nutrient substance that some is the physiological function of former food protein or the unexistent uniqueness of its composition aminoacid.The research and development of bioactive peptide provide possibility for utilizing the not high protein resource of biological value to produce human health food base material.At present, many regional foods of China and albumen are under-supply, become the serious problems that can't avoid, so the proteic development and use of secondary quality plant seem particularly important, are raw material with the Semen Gossypii, and the preparation and the meaning of carrying out Functional Polypeptides are fairly obvious.Enzyme hydrolysis method is mainly adopted in the production of biologically active peptide at present.Enzymatic hydrolysis can improve proteinic physics and chemistry and functional character under the prerequisite that does not reduce nutritive value, expansion is in the Application in Food Processing scope, and the bioactive peptide safety of enzymatic isolation method production high, cheap, be easy to promote.Technology with zymyhydrolyzed protein is existing multiple, the enzyme hydrolysis of the employing single variety that has, and the time is long, and during consumption energy consumption, along with the prolongation of hydrolysis time, the hydrolyzate activity is forfeiture gradually also; The hydrolysis simultaneously of the enzyme of a plurality of kinds of employing that have, but select the enzyme of different cultivars and assembly thereof, the different hydrolysising condition of employing, the hydrolyzate that is obtained is different, the characteristic that hydrolyzate has is also different; In addition, the protein polypeptide of Production by Enzymes is often with bitterness, and this also is the principal element of restriction enzyme process suitability for industrialized production polypeptide.For the Production by Enzymes cotton-seed polypeptide, domestic and international rarely seen bibliographical information, wherein the inventive method utilization complex enzyme hydrolysis technology hydrolysis Semen Gossypii protein isolate makes the cotton-seed polypeptide with antioxidant activity and yet there are no report.
Summary of the invention
The objective of the invention is to remedy the deficiencies in the prior art part, and provide a kind of technology simple, hydrolyzate is well active and be easy to control, the effective and stable performance of gained finished product antioxidation, and the enzyme process that is suitable for suitability for industrialized production is produced the production method of cotton-seed polypeptide dry powder.
The objective of the invention is to realize by following measure: the inventive method comprises the steps: successively
1) gets the Semen Gossypii protein isolate of a weight, add the distilled water of 3~6 times of weight, grind to form uniform Semen Gossypii protein isolate grinding slurry;
2) by the weight of prepared Semen Gossypii protein isolate grinding slurry, add the distilled water of 3~7 times of weight again, put in the retort, with alkaline solution adjust pH to 7.8~8.2;
3) with step 2) gained solution is in continuous stirring and gets under the state, and set by step 1) 4~5% of the Semen Gossypii protein isolate weight of getting, add alkaline microbial protease, and be heated to 50~55 ℃ and be hydrolyzed;
4) constantly regulating and keep the pH value of hydrolyzed solution with alkaline solution in hydrolytic process is 7.9~8.1, continues hydrolysis 1~1.5 hour;
5) hydrolyzed solution that first hydrolysis in the step 4) is finished is adjusted pH value to 6.8~7.2 with acid solution, and temperature keeps 48~52 ℃;
6) step 5) gained hydrolyzed solution is being continued under the state that stirs, set by step 1) 4~6% of the Semen Gossypii protein isolate weight of getting add flavor proteases, and to keep its pH value with alkaline solution be 6.9~7.1, and keeping temperature is 48~52 ℃, continues hydrolysis 2~3 hours;
7) the hydrolyzed solution heated and boiled that hydrolysis for the second time in the step 6) is finished is 15~20 minutes, makes enzyme-deactivating;
8) hydrolyzed solution in the step 7) is cooled to 70~80 ℃, to the filter pocket filtration, gained filtrate vacuum concentration to 40~45Brix (Baume degrees) will promptly get the cotton-seed polypeptide dry powder with antioxidation after the concentrated solution spray drying.
The total protein content of above-mentioned used Semen Gossypii protein isolate is generally 60-99%, gossypol content≤0.06%; Above-mentioned used alkaline solution is that molar concentration is the sodium hydroxide solution of 1mol/L, and used acid solution is that molar concentration is the hydrochloric acid solution of 1mol/L, adopts these two kinds of solution to regulate simple, the economy, effective of pH value of hydrolyzed solution; The label of above-mentioned used alkaline microbial protease is Alcalase, and enzyme activity is 2.4Au/g, and the label of used flavor protease is Flavourzyme
TM, enzyme activity is 500LAPU/g, this kind of enzyme specificity height, stable performance.
The present invention compared with prior art has following advantage:
Adopted the multistage directionally hydrolyzing Semen Gossypii of compound enzyme protein isolate, be hydrolyzed with the enzyme of different performance stage by stage at high molecular weight protein of different nature, the special finger degree of hydrolysis strengthens, greatly improved the utilization rate of enzyme, hydrolysis time shortens, energy consumption descends, effectively raise the activity of hydrolyzate, hydrolyzate does not have obvious bitterness, and production cost is relatively low, invests less, products made thereby not only can be directly as the high protein supplementary, also can be used as acidic vegetable protein drink, motion food, infant food, the additive of military supplies food etc. is a kind of stronger natural health nutriment of non-oxidizability of like product in the past that is better than, and has purposes widely.
The specific embodiment
Embodiment 1, has the production of the cotton-seed polypeptide dry powder of antioxidation
Get 20 kilograms of the Semen Gossypii protein isolates of protein content 60%, add 60 kilograms of distilled water, grind to form fine and smooth Semen Gossypii protein isolate grinding slurry uniformly with colloid mill, add 320 kilograms of distilled water again, drop in the reaction filling, with molar concentration is that to regulate its pH value be 7.9 for the sodium hydroxide solution of 1mol/L, under the state of continuous stirring, add label and be Alcalase alkaline protease 1kg (, and be heated to 54 ℃ and be hydrolyzed, constantly sodium hydroxide solution adjustment and the maintenance pH value with 1mol/L is 8.0 in hydrolytic process, keeping temperature is 54 ℃, continues hydrolysis 1 hour.After hydrolysis for the first time finishes, with molar concentration be the hydrochloric acid solution of 1mol/L to adjust its pH value be 7.0, thermoregulation is 50 ℃, the adding label is Flavourzyme under the state that constantly stirs
TMFlavor protease 1.2kg, constantly sodium hydroxide solution adjustment and the maintenance pH value with 1mol/L is 7.0 in hydrolytic process, keeping temperature is 50 ℃, continue hydrolysis 2.5 hours, after hydrolysis finishes, the heated and boiled hydrolyzed solution made enzyme-deactivating in 15 minutes, open reaction then and irritate outer condensed water, make hydrolyzed solution be cooled to 75 ℃, emitting hydrolyzed solution to filter pocket filters, gained filtrate vacuum concentration is spray dried to 100 purpose fine powders to 45Brix with concentrated solution, promptly gets the cotton-seed polypeptide dry powder with antioxidation.
Embodiment 2, has the production of the cotton-seed polypeptide dry powder of antioxidation
Get 18 kilograms of the Semen Gossypii protein isolates of protein content 70%, add 72 kilograms of distilled water, grind to form fine and smooth Semen Gossypii protein isolate grinding slurry uniformly with colloid mill, add 280 kilograms of distilled water again, drop in the reaction filling, with molar concentration is that to regulate its pH value be 8.0 for the sodium hydroxide solution of 1mol/L, adding label under the state of continuous stirring is the alkaline protease 0.8kg of Alcalase, and be heated to 55 ℃ and be hydrolyzed, constantly sodium hydroxide solution adjustment and the maintenance pH value with 1mol/L is 7.9 in hydrolytic process, keeping temperature is 55 ℃, continues hydrolysis 1.5 hours.After hydrolysis for the first time finishes, with molar concentration be the hydrochloric acid solution of 1mol/L to adjust its pH value be 7.1, thermoregulation is 49 ℃, the adding label is Flavourzyme under the state that constantly stirs
TMFlavor protease 0.8kg, constantly sodium hydroxide solution adjustment and the maintenance pH value with 1mol/L is 7.1 in hydrolytic process, and keeping temperature is 49 ℃, continues hydrolysis 3 hours, after hydrolysis finishes, the heated and boiled hydrolyzed solution made enzyme-deactivating in 20 minutes, opened reaction then and irritated outer condensed water, made hydrolyzed solution be cooled to 70 ℃, emitting hydrolyzed solution to filter pocket filters, gained filtrate vacuum concentration is spray dried to 100 purpose fine powders to 43Brix with concentrated solution, promptly gets the cotton-seed polypeptide dry powder with antioxidation.