52 results about "Candida antarctica" patented technology

The invention provides a biologic deodorant as well as a preparation method and an application thereof. The biologic deodorant is a biologic fermentation liquid of which a microorganism strain is combined with one or more of yeast strains or one or two of bacteria into a mixed bacterium, wherein the yeast strains comprise candida Antarctica lipase and candida rugosa; the bacteria comprise bacillus licheniformis and bacillus subtilis; after microorganism strains are subjected to strain domesticating by using tea seed cake dregs as a sole nitrogen source, a two-stage fermentation process is adopted for fermentation, finally the microorganism strains in a fermentation bacterial liquid are in the dormant state, and the final biologic deodorant is obtained; when the biologic deodorant is used, after water is added and the biologic deodorant is in contact with air, the microorganism strains can continuously grow and generate more enzymes. By adopting the biologic deodorant provided by the invention, organic matters which can generate odor can be fundamentally removed, the degree that a pipeline is blocked by organic matters is reduced or eliminated, and the biologic deodorant can be also used for washing oil-containing or/and protein-containing or/and starch-containing dirt, does not damage any pipeline in a sewer, and is environmental-friendly.

The present invention relates to a biocatalytic method of preparing a mono-acylated polyol catalyzed by triacyl-glycerol lipase mutants, as for example derived from Candida antarctica lipase B (CALB); a biocatalytic method of enantioselectively preparing an asymmetric mono-acylated polyol, catalyzed by the same enzyme mutants; as well as the use of a mutated triacylglycerol lipase in a method of preparing mono-acylated polyols. The invention also provides novel mutants, coding sequences thereof, and recombinant microorganisms carrying said coding sequences.

Shown and described is a composition and a method to prepare a dopant-free photoluminescent hydrogel with synthetic polymers are disclosed. The hydrogel can be synthesized in one embodiment by incorporating an amino acid to a citric acid based polyester oligomer followed by multiple cros slinking group functionalization through a transesterification reaction using an enzyme such as Candida Antarctica Lipase B (CALB) as a catalyst. The hydrogels are injectable, degradable, and their mechanical and photoluminescent properties are tunable. An in vivo study shows that the hydrogel emits strong fluorescence under visible light excitation and can completely degrade over time.

The invention discloses chiral polyester compounds and a preparation method thereof. The chiral polyester compounds have structural units of N-substituted-L-aspartic acid and long-chain fatty diol, and have a structural general formula represented by a formula (I) shown in the description, wherein in the formula (I), a substituent R is benzyloxycarbonyl, t-butyloxycarboryl or benzyl; m = 2, 4, 6or 10; and n represents an integer of 30 to 105; and a substituent of the N-substituted-L-aspartic acid is the same as the substituent R in the formula (I). The method provided by the invention adoptsa diester containing a chiral carbon atom and a diol without a chiral carbon atom as raw materials for the first time, and the novel chiral polyester compounds are synthesized under the action of a candida antarctica lipase B catalyst; and the compounds have the advantage of single configuration, are environmentally-friendly biodegradable materials, and have broad application prospects.

The invention discloses a method for preparing chiral isoquinoline carboxylic acid (I). The method comprises following steps: racemate of a compound I is subjected to a reaction to produce the compound shown as (I) in an aqueous phase buffer solution and under the catalysis of candida antarctica lipase B, the reaction is required to be always carried out at a preset pH value, and the preset pH value is 7.8-8.2. The method has the characteristics that the reaction condition is mild, stereoselectivity is high, reaction efficiency is high, and the technology is relatively simple and the like andhas industrial application prospects.

The invention relates to a method for preparing (S)-1-(1-naphthyl)ethylamine by an enzyme method. According to the method, Candida antarctica lipase B is adsorbed by macroporous resin, and cross-linking is carried out by using glutaraldehyde so as to obtain immobilized Candida antarctica lipase B. The immobilized lipase serves as a catalyst, toluene serves as a solvent, ethyl acetate serves as an acyl donor, (S)-1-(1-naphthyl)ethylketoxime is selectively esterified, (R)-1-(1-naphthyl)ethylamine is not esterified, and a racemation reaction is carried out in the presence of a racemation catalyst and hydrogen gas. According to the method, the immobilized Candida antarctica lipase B can be used for completely converting 1-(1-naphthyl)ethylketoxime into (S)-1-(1-naphthyl)ethylamine ethyl ester at a relatively high temperature, and the reaction has the characteristics of short reaction time, high product optical purity, and the like.

The invention relates to a method for producing biodiesel by utilizing immobilized lipase and adopting a static emulsion method. The method for producing biodiesel by utilizing immobilized lipase and adopting the static emulsion method comprises the following steps: (1) adding polydimethylsiloxane, lipase solution and a platinum catalyst into a reactor, carrying out vacuum magnetic stirring for 0.5-2 hours to obtain emulsion, then adding a dispersing agent into the emulsion to form composite emulsion, under the condition of mechanical stirring, solidifying for forming enzyme-loaded static emulsion silica gel microspheres, and filtering, so that immobilized lipase is obtained; and (2) adding vegetable fat and short chain alcohol into the reactor, then adding normal hexane with the volume 1-4 times that of the vegetable fat and immobilized lipase with the mass 20-30% that of the vegetable fat, and reacting at constant temperature of 20-600 DEG C, so that the biodiesel is obtained, wherein the lipase is candida antarctica lipase B, candida rogusa lipase or burkholderia cepacia lipase. The method for producing biodiesel by utilizing immobilized lipase and adopting the static emulsion method has the advantages of simple preparation technology, mild reaction conditions, no environmental pollution and high catalyst repeated utilization factor and is beneficial to industrial application of production of biodiesel.

The invention introduces a novel chiral separation method for acquiring a carprofen single enantiomer, namely a method for synthesizing the carprofen single enantiomer by stereoselectively hydrolyzing a carprofen enantiomer through biological enzyme catalysis. According to the method, candida Antarctica lipase A is utilized for hydrolyzing the carprofen enantiomer and cyclodextrin in a high selectivity and high catalytic efficiency manner so as to solubilize the carprofen enantiomer, so that the hydrolysis reaction of the carprofen enantiomer in a phosphate buffer solution is accelerated; the conversion rate of a substrate and the optical purity of a product can respectively reach 48.00% and 96.24%, and the stereoselectivity E is more than 145; the problems of low optical purity and yield, environmental pollution and the like in a common separation technique are overcome, and the high conversion rate and the high selectivity of the hydrolysis of the carprofen enantiomer can be realized, so that the purposes that non-toxic, harmless and environment-friendly separation of a chiral compound, reaction conditions are mild, the operation is simple and convenient, the cost is low and the like are achieved.

The invention belongs to the technical field of polylactic acid production, particularly discloses chemically modified lipase for synthesizing L-lactide, and further discloses a preparation method of the lipase. According to the preparation method, epoxy isopropyl oleate is adopted for chemically modifying the lipase B derived from Candida antarctica, such that chemically modified lipase is obtained. The chemically modified lipase is high in enzyme activity, and the yield is remarkably improved when the chemically modified lipase is used for catalyzing to generate L-lactide.

The invention discloses a double-lipase cell surface co-display engineering bacterium, and a construction method and application thereof. The engineering bacterium is co-displayed on the Pichia pastoris cell surface by using Saccharomyces cerevisiae cell wall protein Sed1p as ankyrin and Rhizopus oryzae lipase and Candida antarctica lipase B as double-lipase target proteins, thereby constructing the double-lipase cell surface co-display recombinant yeast engineering bacterium. The Rhizopus oryzae lipase and Candida antarctica lipase B are co-displayed on the Pichia pastoris cell wall surface to prepare the Rhizopus oryzae lipase/Candida antarctica lipase B cell surface co-display complete cell catalyst. The maximum enzyme activity of the surface co-display complete cell catalyst is 686U/g-cell dry weight, which is respectively 3 times or 2 times of the enzyme activity of the independently displayed Rhizopus oryzae lipase or Candida antarctica lipase B; and the methyl ester yield of the catalytic grease esterification reaction is up to 96%.

The invention relates to a genetically engineered bacterium for producing lipase by using a methanol and xylose co-substrate and application of the genetically engineered bacterium. A methanol oxidasegene aox1, a dihydroxyacetone synthase gene das, a catalase gene cta and a dihydroxyacetone kinase gene dak are introduced into host bacteria; and the host bacteria are Candida antarctica capable ofproducing the lipase by utilizing xylose. According to the invention, a methanol metabolic pathway is introduced into the Candida antarctica by utilizing a synthetic biology way, so that the Candida antarctica can produce the lipase by taking non-food-grade raw materials, namely the methanol and the xylose, as a co-substrate, the production cost is reduced to a certain extent, and the applicationhas great significance and economic value.

The invention relates to a method for preparing DAG by enzymolysis of TAG, and belongs to the technical field of preparation of DAG. The method comprises the step of adding ethanol or/and metal ions into TAG, water and candida Antarctica lipase A to form a hydrolyzed system. According to the method, through the added metal ions, the activity of the candida Antarctica lipase A can be remarkably improved, and the hydrolysis rate of TAG is increased; ethanol and the metal ions are added at the same time, the 2-site selection tendency of the candida Antarctica lipase A for TAG can be improved, reaction time can be shortened, the hydrolysis rate is increased, and amplitude is further increased; therefore, ethanol plays the effect of promoting the metal ions to increase the hydrolysis rate.

The invention relates to a method for preparing 1,3-diglyceride through enzymolysis, and belongs to the technical field of 1,3-diglyceride. The method comprises the step of adding ethanol or/and chelating agent in TAG, water and Candida antarctica lipase A to form a hydrolysis system. According to the method, the chelating agent is added in the TAG hydrolysis system to remove metal ion (mainly from the TAG), thereby reducing the inhibiting effect of the metal ion to the enzyme activity and improving the hydrolysis rate; after ethanol and the chelating agent are simultaneously added, not only is the selection tendency of the Candida antarctica lipase A to 2 position of the TAG improved and the reaction time shortened, but also the improvement range of the hydrolysis speed is further increased; therefore, ethanol plays the effect of promoting the chelating agent to improve the hydrolysis speed.

The invention relates to a preparation method of an enzyme-loaded xerogel monolithic column catalytic filler. The method comprises the following steps of embedding Candida antarctica lipase B through a sol-gel method, taking organosilicon as a precursor, carrying out hydrolysis and condensation polymerization, and carrying out normal-pressure drying by using a cylindrical mold to prepare the cylindrical enzyme-loaded xerogel monolithic column catalytic filler. In the obtained enzyme-loaded xerogel monolithic column catalytic filler, xerogel has a silicon network structure, enzyme is embedded in the xerogel, and the enzyme-loaded xerogel monolithic column catalytic filler has the advantages of complete catalysis, no surface crack, high mechanical strength and the like.

The invention discloses a method for producing candida antarctica lipase B and a specific DNA molecule used by the method. The nucleotide sequence of the specific DNA molecule is shown as SEQ ID NO: 3. Experiments prove that the recombinant plasmid pET30a-CALB is used for prokaryotic expression of the CALB inclusion body, and then renaturation is performed to obtain the CALB protein with high purity (more than 95%) and high activity; the enzyme activity of CALB protein obtained from 1L culture solution is about 21252U, and the specific activity is about 253U/mg, which is far higher than that of the CALB protein prepared by the existing literature. Therefore, the method provided by the invention can improve the yield of the CALB remarkably, the production process is simple, and the method can be applied to actual production The invention has important application value.

The present invention relates a hybrid material comprising: a protein matrix comprising the lipase B from Candida antarctica and nanoparticles of copper species selected from: Cu (0), Cu₂O Cu₃(PO₄)₂ or any combination thereof, having their larger dimension between 3 and 15 nm. The material was prepared by the use of an enzyme in a buffer solution and a copper salt at room temperature. The material shows excellent catalase-like activity, excellent catalytic capacity in the degradation of organic pollutants, like Bisphenol A, and in the reduction of 4-nitrophenol to 4-aminophenol.

The invention discloses a method for preparing methylbutylamine p-benzoquinone through lipase catalysis. The method is characterized by comprising a step of catalyzing butyl amine to react with methylp-benzoquinone by using immobilized candida antarctica lipase, thereby obtaining 2-methyl-5-methylbutylamine p-benzoquinone. The 2-methyl-5-methylbutylamine p-benzoquinone is prepared by using an enzyme catalysis method, because of high spatial selectivity of an enzyme, difficulties that a chemical synthesis process is poor in selectivity and hard in product separation can be avoided, and the method is an environmental-friendly efficient synthesis method.

The invention belongs to the technical field of sunflower seed oil processing, and particularly relates to a method for obtaining 1, 3-diglyceride from high oleic acid sunflower seed oil. The method for obtaining the 1, 3-diglyceride from the high-oleic-acid sunflower seed oil comprises the following steps: weighing the sunflower seed oil, adding candida antarctica lipase A and deionized water, carrying out enzymolysis, constant-temperature oscillation, centrifugation and secondary molecular distillation to finally obtain a product containing the 1, 3-diglyceride, and according to the weight of the high-oleic-acid sunflower seed oil, adding the 1, 3-diglyceride into the sunflower seed oil to obtain the 1, 3-diglyceride. The dosage of the candida antarctica lipase A is 2500-3500 u/g. According to the method, sunflower seed oil is used as a main raw material, the process operation is simple, and the product is rich in nutrition and high in economic value and has wide application prospects in the industries of food, medicine, chemical engineering and the like.