303 results about "Keratinase" patented technology

The invention relates to a method for preparing a microbial feed additive. Feather meal, mannitol, glucose, sodium citrate, sodium chloride and the like are taken as raw materials, and inoculated with Bacullus subtilis YYW-1 with the number of CGMCC NO.2396 to prepare the microbial feed additive by submerged fermentation and spin flash drying technology. The active ingredients of the microbial feed additive are the Bacullus subtilis and cultures thereof, and the cultures contain metabolites such as keratinase capable of efficiently degrading feather. The product can be used in the breeding industry and the feed industry, and has the advantages of improving intestinal flora, improving digestion and absorption capacity of animals and the feed conversion and utilization rate, particularly promoting the digestion, absorption and utilization of protein materials such as the feather meal, and reducing cost.

The invention discloses an antibacterial and anti-felting wool fabric finishing method, and belongs to the technical field of spinning. The method includes the steps of firstly, adding hydrogen peroxide and sodium hydroxide to preprocess wool fabric so that scale cells and cortex cells of surfaces of wool fibers can be broken; secondly, conducting enzyme treatment, wherein keratinase and alkaline protease are added for concerted reaction enzymolysis, and after keratin enzymolysis is conducted on the outer layers of scales through keratinase, enzymolysis is conducted on cystine of keratin protein of parts such as inner stratum corneum and cortical layers of wool through alkaline protease; thirdly, conducting chemical finishing, wherein twice soaking and twice rolling are conducted on the wool fabric through a glycerol citric acid ester solution. By means of the method, the effect of increasing wool anti-felting and antibacterial capacity is remarkable, reaction time is short, subsequent processing is simple, the influences on breaking force and whiteness of the processed wool fabric are small, dyeing performance is greatly improved, the directional friction effect is greatly reduced, high economic benefits are achieved, and industrial popularization is facilitated.

The invention discloses keratinase with improved thermal stability and application thereof, and belongs to the field of genetic engineering. The keratinase (ker) gene of bacillus licheniformis BBE11-1 is subjected to site-directed mutation by using a site-directed mutation technology and is cloned and linked to a bacillus subtilis expression vector pMA 0911; and bacillus subtilis WB600 is transformed, and a bacillus subtilis WB600-pMA 0911-kerTB capable of producing the keratinase with better thermal stability can be obtained through purification tests. The keratinase expressed by a strain at T1/2 at 60 DEG C lasts for 78min, which is improved nearby 9 folds compared with wild type keratinase at T1/2. The keratinase with improved thermal stability lays an excellent foundation for the application of keratinase.

The invention relates to a strain for generating keratinase and an application thereof. The strain is Stenotrophomonas maltophilia) DHHJ CGMCC No.2231 applied to the degradation of soft keratin, such as chicken feathers, pigeon feathers, cow hair, wool, hair and hard keratin, such as ox horns, goat horns, sheep hoofs and nail waste. Compared with other strains for degrading the keratin, the strain has mild fermentation conditions, is convenient to apply and can generate the keratinase with higher enzymatic activity and stability.

The invention belongs to the field of microorganism, particularly relates to ((i) bacillus cereus (/i)) Y-15 for efficiently degrading feather keratin, and further relates to application of the ((i) bacillus cereus (/i)) Y-15. The ((i) bacillus cereus (/i)) Y-15 is preserved in China General Microbiological Culture Collection Center in June 6, 2017, with the culture preservation number being CGMCCNO. 14221; the colonial morphology on a milk screening plate is as follows: bacterial colony is white and circular, the waxiness on the surface is non-transparent, and the edge is wavelike; gram staining shows a positive result, and the thallus is bacilliform. The ((i) bacillus cereus (/i)) Y-15 screened and cultured has excellent degradation effect on keratin.

The present invention discloses a bio-organic fertilizer of a poultry feather amino acid and a preparation method of the same. According to the present invention, bacillus amyloliquefaciens, moist cellulomonas cartae and trichoderma viride that can efficiently secrete keratinase are used to perform fermentation and enzymatic hydrolysis on a mixture of poultry feathers and edible fungi residues; then anti-disease bacteria and solubilizing and potassium bacteria are added in an aging phase to perform secondary fermentation; mature materials are milled and sieved; and the bio-organic fertilizer of the poultry feather amino acid is prepared and obtained. The bio-organic fertilizer not only has a high content of organic matter and a high content of humic acid that are capable of soil amelioration, but also has a high content and various types of amino acids that are capable of crop production increasing and quality improving; the added functional microorganisms are capable of disease resisting, and further capable of releasing poorly soluble potassium and phosphorus in the soil to an absorbable and usable form; and applying the bio-organic fertilizer to the production can reduce the quantity of applied pesticides and fertilizers and produce safe and healthy agricultural products, and has a very wide application prospect.

The invention discloses a higher-substrate-specificity keratinase mutant and a preparation method thereof, belonging to the field of enzyme engineering. Analysis is performed to obtain the optimal mutant site to perform site-directed mutagenesis, thereby obtaining the excellent mutant with higher keratinase enzyme activity and substrate specificity. The keratinase and mutant thereof can effectively hydrolyze feather, wool and other non-water-soluble keratin substrates, and can be used for leather textile industry and feed industry.

The invention discloses stenotrophomonas maltophilia for generating keratinase and an application of stenotrophomonas maltophilia. A strain for generating keratinase can efficiently degrade feathers within 24 hours, the activity of the keratinase subjected to fermentation and primary optimization can reach 150U/mL. Multiple kinds of amino acids can be produced after the degraded feathers are subjected to amino acid analysis, and the degraded feathers can replace grain crops such as soybeans and the like to be used as a main nitrogen source of feeds. Meanwhile, a fermenting enzyme solution of the stenotrophomonas maltophilia has a better treatment effect on wool. The stenotrophomonas maltophilia for generating the keratinase, screened in the invention, has better application prospects in the industries of feeds and textiles.

The invention discloses a method for producing peptone by taking poultry feather as a raw material. The method comprises the following steps: performing pretreatment on the poultry feather raw material, and then sending into a microwave puffing machine for treatment; adding keratinase for performing enzymolysis reaction and heating for enzyme deactivation; adding activated carbon to perform deodorization, peculiar smell removal, decolorization and other treatment, and filtering; and performing evaporation concentration and high-speed centrifugal spray-drying, and getting the peptone after drying. According to the method disclosed by the invention, the combination of microwave puffing and keratinase enzymolysis technologies is adopted for producing the peptone by taking the poultry feather as the raw material, a new way is opened for resource utilization and development of the waste feather, and the resource utilization is performed on the poultry feather produced during cultivation, so that environmental pollution and the waste of resources are reduced, social benefits are increased, the cost of the raw material is low, process equipment is simple, the process flow is simple and strong in operability, and the industrial production can be realized; the peptone produced by the method disclosed by the invention has good quality and high yield; and the method disclosed by the invention can fill in the technical blank in preparation of the peptone by taking the feather as the raw material.

The invention discloses a signal peptide for optimizing high-level secretory expression of keratinase Ker and application of the signal peptide and belongs to the fields of genetic engineering and enzyme engineering. The signal peptide is characterized in that 46 secretory signal peptides from bacillus subtilis are preliminarily screened and 6 secretory signal peptides capable of obviously improving the secretion volume of the keratinase in the 46 secretory signal peptides are directionally transformed, so the signal peptide for optimizing the high-level secretory expression of keratinase is obtained. An N terminal of the signal peptide is provided with first nine amino acid residues of a signal peptide AbnA; an H terminal of the signal peptide is provided with a hydrophobic sequence of a signal peptide YfkN, and a C terminal of the signal peptide is provided with last four amino acid residues of a signal peptide PhoB. The signal peptide disclosed by the invention is fused at the N terminal of the keratinase Ker, so the secretion efficiency of the keratinase of recombinant bacillus subtilis is remarkably improved, and the enzyme activity of extracellular keratinase of the bacillus subtilis is improved by 3.39 times. The extracellular keratinase producing capability of a transformed strain is remarkably improved, the industrial application is better facilitated, the production cost can be reduced, and the production efficiency is improved.

The invention provides a wool-fabric biological anti-felting method based on cutinase, keratinase and protease treatment, which belongs to the technical field of application of dyeing and finishing of wool fabric in the wool-spinning industry. The method aims to overcome the defects that the chlorination-process for wool-felting prevention seriously pollutes the environment and the single protease-method treatment is poor in fabric wettability and high in felting rate in order to achieve the aim of optimizing the protease treatment effect of the wool fabric. After all-wool grey fabric is extracted to remove free oily impurities, the all-wool grey fabric is sequentially pretreated with cutinase and keratinase solutions so as to improve the surface hydrophilicity of fiber scales and the accessibility of protease molecules, and then the wool fabric is subjected to reduction processing in a protease solution, thus biological processing combined with wool enzyme reduction is realized. The method makes the prior chlorination-process felting prevention replaced with a biological-method wool-felting prevention process, and the method not only effectively improve the reduction rate and anti-felting effect of the wool fabric, and promote the improvement of fabric wettability, but also can effectively increase the dyeing depth of fabric, and reduce fiber damage in reduction processing, and is favorable for protecting ecological environment.

The invention discloses a preparation method of a keratin. The preparation method comprises the following steps: I, adding a raw material comprising keratin to a first aqueous solution for alkaline hydrolysis, and carrying out solid-liquid separation to obtain a first keratin solid; II, adding the first keratin solid into a second aqueous solution, adding a proper amount of compound protease for enzymolysis for 4-5 hours under the conditions that the temperature is 48-52 DEG C and the pH is 8.0-9.0; then, inactivating the compound protease; then, adding a proper amount of keratinase for enzymolysis for 2.5-3.5 hours at 35-40 DEG C; and finally, carrying out solid-liquid separation to obtain a second keratin solid; III, first, shading and oxidizing the second keratin solid for 3.5-4.5 hours by using an oxidizing agent, and then, carrying out solid-liquid separation to obtain a third keratin solid; and IV, drying the third keratin solid till the water content is below 5-8%, wherein the dried third keratin solid is the target keratin.

The invention provides a treating agent for treating pigs died from diseases, a preparation method and a treating method for the pigs died from diseases, and relates to the technical field of treatment for animals died from diseases. The treating agent mainly comprises raw materials such as bacillus subtilis, saccharomycetes, alkaline protease, keratinase, lipase, aspergillus niger, actinomycetesand bacillus licheniformis. The treating agent has good decomposition processing capacity for the pigs died from diseases and can completely degrade dead pig carcasses by utilizing the organic matterdegrading capacity of microorganisms, combing the synergistic characteristic between specific biological strains, and scientifically and reasonably matching the raw materials of the strains, thereby realizing innocent treatment of the dead pig carcasses; in addition, the dead pig carcasses treated by the treating agent can be finally converted into high-quality organic fertilizer raw materials, thereby turning waste into wealth and realizing resource reutilization. The invention further provides the treating method for the pigs died from diseases, and improves the defects that the treating method in the prior art is long in treating time, large in occupied area, harmful in treatment, and high in stealing possibility.

The invention provides an encoding gene of keratinase and recombination expression and application thereof. A keratinase encoding gene kerbp is obtained from extracting total DNA PCR from brevibacillus parabrevis CGMCC 10798, the total length of the gen is 1152 nucleotides, and 383 amino acids are encoded. The nucleotide sequence is shown in SEQ ID NO:1, and the amino acid sequence is shown in SEQ ID NO:2. The invention further discloses a recombination expression and separation purification method of the keratinase. E.coli is adopted as an example, E.coli BL21(DE3) is adopted as an expression host, and heterologous expression of the keratinase gene is achieved. The most proper acting PH of the recombination keratinase is 8.0, and the most proper temperature of the recombination keratinase is 60 DEG C; Tween 40 and Triton X-100 have the effect of promoting activity of the keratinase. The keratinase can effectively remove hair on goatskin, and has the good application prospects in the industries such as tanning, washing, spinning and egg white waste disposal.

The invention discloses a keratinase mutant with improved catalytic performance and an application, belongs to the technical field of genetic engineering and provides recombinant keratinase constructed on the basis of leading peptide engineering and multi-site saturated mutation and a leading peptide engineering method. A recombination strain M7 shows high keratinase catalytic potential, enzyme activity is remarkably improved from 179 U/mL to 1114 U/mL, the optimal reaction temperature is 40 DEG C, the optimal reaction pH is 10.0, over 80% enzyme activity is retained after water bath processing is performed for 90 min at 40 DEG C, heat stability is better, and the keratinase mutant is suitable for industrial large-scale production. Besides, the method for modifying protease with the leading peptide engineering can be a universal way for modifying industrial enzyme with the self-shearing characteristic.

The invention provides a keratinase and its coding gene. It has advantages of high activity, good heat stability, wide PH range and efficient degradation of alpha & beta-keratinase. It has also the character of common protease and can degrade many kinds of protein derived from plants and animals. It can be widely used in the trades such as feed, foods, washing, wool spinning and pharmacy.