99 results about "Phospholipase A1" patented technology

The present invention relates to a simple and economically attractive process for the pretreatment of vegetable oils which involves (a) enzymatic degumming with commercially available phospholipase A1 from the sources like Aspergillus oryzae microorganism, (b) bleaching of the enzymatically degummed oil using bleaching earth and activated carbon, and (c) dewaxing (in case of rice bran oil) of degummed and bleached oil at lower temperature to obtain oil with less than 5 ppm of residual phosphorus which is amenable for physical refining.

The invention discloses a method for degumming soybean oil by phospholipase catalysis, which belongs to the field of vegetable oil degumming and includes the steps of preheating, adjusting pH, adding enzyme prior to mixing, allowing for enzymolysis, deactivating the enzyme and separating. The method is technically characterized by including: using phospholipase C as the phospholipase for catalysis, and preheating crude soybean oil prior to acid treatment; cooling oil-water mixture subjected to acid treatment to 37-60 DEG C, adding NaOH solution to adjust pH to 3-8, adding distilled water accounting for 1%-5% of the weight of the oil, adding the phospholipase C according to an oil proportion of 100-2000U/g, and mixing well; setting the mixing speed at 100-600r/min, and allowing for enzyme reaction for 0.5-2 hours; and deactivating the enzyme at high temperature for a reaction system, and performing high-speed centrifugal separation to complete degumming. The degumming time of the method is shortened by 1-2 times as compared with that of using phospholipase A1, phosphorus content is reduced, diglyceride content of the oil is increased slightly, and economic benefit is increased for oil production industries.

The invention provides a method for refining rape seed crude oil by immobilized phosphatidase A1, and relates to the method for refining the rape seed crude oil. The problems of inactivation of enzyme caused by an uneasily controlled enzyme reaction condition during production and high cost of phosphatidase in enzyme process degumming can be solved by selecting the immobilized phosphatidase A1 for degumming. The method for refining the rape seed crude oil by the immobilized phosphatidase A1 is realized by the following steps: 1, preparing a reaction solution; 2, preparing a mixed solution; 3, preparing granulated immobilized enzyme; 4, pretreating the rape seed crude oil; 5, adding the immobilized enzyme into the oil; and 6, stirring and centrifugating to realize the refined rape seed crude oil by the immobilized phosphatidase A1. The rape seed crude oil is subjected to the degumming treatment by the method to improve degumming efficiency. Compared with the prior method, the method improves the degumming efficiency by 5 to 30 percent and the economic benefit by 1 to 3 percent.

Disclosed is a method for preparing L-α-Glycerylphosphorylcholine with high yields and purity. The method uses phospholipase A₁-based enzymatic hydrolysis, ion-exchange resin purification and silica gel column chromatography to prepare L-α-glycerylphosphorylcholin with purity up to 99.8% and a final yield up to 78.4%. The method disclosed is simple, cost-effective, environmentally friendly, and adaptable to industrial applications.

The invention discloses a preparation method suitable for industrialized continuous production of enzyme modified concentrated phospholipids. The preparation method comprises the following steps: a, adding phospholipase A1, phospholipase A2, and a 1, 3-lipase aqueous solution into concentrated phospholipids for enzymatic modification reaction; b, pumping the concentrated soybean phospholipids after enzymatic modification into a fixed scraper film evaporator for dehydration by continuous evaporation and enzyme inactivation through a screw pump, so as to enable the moisture to be decreased to 1% or below; c, concentrating, dewatering, cooling the inactivated enzyme modified phospholipids with a cooler, and introducing the cooled enzyme modified phospholipids into a vacuum stirring tank for removing oxygen in the modified phospholipids, so as to obtain the enzyme modified soybean phospholipids with good storage stability. The preparation method is suitable for continuous industrial production, the processing technology is easy and convenient, the production efficiency is remarkably improved, and the produced enzyme modified soybean phospholipids are good in dispersity, hydrophilia and heat resistance in water, quite good in emulsion stability in a low pH value range and hyper-salt concentration, and widely applicable to the industries, such as, food, medicine, daily-use chemicals, pesticides, paint coatings, leather and textile, petrochemical industry and fodder.

This invention open a cold tolerance of Serratia sand Habitat-chuen (Serratia fonticola) xjF1 CGMCC No.1971, through the strain characteristics, enzyme production conditions and the nature of enzyme research, proved a new phospholipase A1 gene consists of two open plA and plS reading frame, was certified plA gene coding phospholipase A1, plS gene coding phospholipase A1 auxiliary protein. This invention relates to the gene containing the recombinant plasmid and reorganization cell, the gene expression products phospholipase A1 in the show activity under low-temperature conditions, can be used in industries such as oil refining process can be simplified production process, lowering energy consumption, improve product quality , protecting the environment, reduce production costs, have important practical significance.

The invention relates to a method for preparing magnetic immobilized phospholipase A1 and a method for refining crude oil by using the magnetic immobilized phospholipase A1. The invention aims to solve the problems of complicated separation and recycling of immobilized enzyme and low activity recovery of the conventional method for preparing the immobilized phospholipase A1, and the problem that the magnetic immobilized enzyme is not used for refining the crude oil at present. The method for preparing and refining the crude oil comprises the following steps of: 1, preparing the magnetic immobilized phospholipase A1; 2, heating the crude oil, and adding citric acid solution; and 3, cooling, regulating the pH value, adding the magnetic immobilized phospholipase A1, stirring, and separating the magnetic immobilized phospholipase A1. The recovery rate of the prepared magnetic immobilized phospholipase A1 is over 85 percent, and the phosphorus content of the crude oil is reduced to 7-10mg/kg. The invention is applied to the field of oil degumming.

The invention relates to a method for refining camellia seed crude oil, in particular to a method for refining the camellia seed crude oil by using immobilized phospholipase A1. The technical scheme of refining the camellia seed crude oil by using the immobilized phospholipase A1provided by the invention is realized by the following steps of: a, immobilizing phospholipase; b, carrying out pre-treatment on the camellia seed crude oil; c, adding the immobilized phospholipase into the camellia seed crude oil; and d, agitating and then centrifuging, namely realizing that the camellia seed crude oil is refined by using the immobilized phospholipase. The method for refining the camellia seed crude oil provided by the invention has the beneficial effects that unsaturated fatty acid is lost for 1-3% and is reduced by 15-20% compared with the loss of the unsaturated fatty acid in chemically-refined camellia seed oil; the immobilized phospholipase A1 is degummed to reduce phosphorus content in the oil to be lower than 5 mg/kg; the heat resistance of the immobilized phospholipase A1 is improved; the immobilized phospholipase A1 can keep a higher activity in a wider pH value range and the sensitivity of the immobilized phospholipase A1 to a reaction environment is reduced, so that the operation conditions are easier to control and implement.

The invention provides a method for degumming soybean crude oil by virtue of combined application of immobilized phospholipase A1 and immobilized phospholipase C. The method comprises the following steps: developing an immobilized phospholipase A1-immobilized phospholipase C two-enzyme degumming technology according to respective characateristics of the phospholipase A1 and phospholipase C, namely, performing conventional enzymic method degumming by adopting a small amount of immobilized phospholipase A1, forming an emulsifying system favorable for the subsequent immobilized phospholipase C effects by utilizing lysophosphatide, and adding a proper amount of the immobilized phospholipase C so as to realize degumming. The lowest obtained degummed phosphorus content is 2.8mg/kg, and after the phospholipase C is continuously used in six batches, the relative activity of the immobilized enzyme is still maintained to be about 80 percent. Therefore, a combined degumming method is adopted, so that the refining rate can be improved, the production cost can be reduced, the degumming reaction time can be reduced by 2 hours, and the oil yield is improved by 1.3 times.

The invention discloses a recombinant escherichia coli for producing phospholipase D and an application thereof, which belongs to the technical field of bioengineering. A phospholipase D gene is obtained through clone in Streptomyces ambofaciens by means of molecular biology measures, constructed expression plasmid is guided into E. coli BL21(DE3), and phosphatase-containing engineering bacteria formed by highly copying and recombining an expression carrier are obtained through kanamycin resistant plate screening. The recombinant phospholipase D is used for converting phosphatidylcholine and serine to generate phosphatidylserine, and efficient production of vitamin C-2-phosphate is achieved. By carrying out reaction for 2 h at the temperature of 40 DEG C with the pH value of 4.5, the yield of phosphatidylserine can reach 15.8 g/L, the conversion rate is 63.9%, and the space time yield is 7.9 g/L/h.

The invention provides a method for immobilizing phosphatidase A1. The method is improved on the technical basis of cross-linked enzyme aggregates and comprises the steps of: preparing free phosphatidase A1 into cross-linked phosphatidase aggregates; and then entrapping the obtained cross-linked phosphatidase aggregates to obtain immobilized phosphatidase A1. The influences of concentration of a phosphatidase liquid, saturation degree of a precipitating agent, precipitation Ph value, precipitation time, concentration of a cross-linking agent, cross-linking time, concentration of sodium alginate, concentration of calcium ions and other different immobilizing conditions on the immobilizing efficiency and the catalytic effect of the phosphatidase are researched, and the enzymology nature of an immobilized phosphatidase membrane is discussed. The advantage of immobilizing the phosphatidase by adopting the method for entrapping and cross-linking aggregates is further explained through an SEM (Scanning Electron Microscope) image of the immobilized phosphatidase membrane. The phosphatidase is immobilized by utilizing the excellent chemical stability, mechanical property and other properties of the entrapped and cross-linked phosphatidase aggregates, the activity and the stability of the phosphatidase in a reaction system are improved, the activity and the selectivity of the phosphatidase are adjusted and controlled, so as to be favorable for the recovery of the phosphatidase and the maintenance of higher activity recovery rate of the phosphatidase; and the activity recovery rate of the finally obtained immobilized phosphatidase is 80.2 percent, and the relative activity of the phosphatidase after being repeatedly used for seven times is kept at 65 percent above.

The invention relates to a non-bitter fishy smell, instant whole egg powder and a preparation method thereof. The method comprises: (a) adopting two-stage dynamic high-pressure micro-jet treatment; (b) sequentially adding compound protease and phospholipid to the whole egg liquid Enzyme A1; wherein the composite protease is papain and flavor protease, the dosage ratio of the two is 2:1, the amount of composite protease added in the whole egg liquid is whole egg liquid: composite protease=100:0.8-1.2, add The amount is calculated by mass ratio; phospholipase A1 is enzymatically hydrolyzed at room temperature, and the added amount in the whole egg liquid is whole egg liquid: phospholipase A1=100:0.01‑0.05, and the added amount is calculated by kg/L; (c) After spray drying, whole egg powder is fluidized bed granulated with a binder. The invention cooperates with dynamic high-pressure micro-jet homogenization, enzymatic hydrolysis and fluidized bed technology to obtain whole egg powder with good instant solubility, and no stratification is found within 10 hours after brewing.

The invention relates to a phosphatidase A1 immobilization method. The method comprises the following steps: 1, allowing a carrier selected from macroporous adsorption resin or ion exchange resin to contact with phospholipase A1 in order to immobilize the phospholipase A1 on the carrier; and 2, drying the phospholipase A1 immobilized carrier obtained in step 1 in order to obtain immobilized phospholipase A1. The invention also provides immobilized phospholipase A1 prepared through the method, and an application of the immobilized phospholipase A1. The immobilized phospholipase A1 has the functions of esterification and acid hydrolysis, can be repeatedly used in the oil industry, and has the advantages of high reaction efficiency low cost and potential industrial application.

Compounds for determining the activity of phospholipase A₂, are described herein, and include embodiments having formula (1)

The invention discloses a vegetable oil degumming method. The method comprises the following steps: (1) simultaneously carrying out degumming reaction on vegetable oil with phospholipase and partial glyceride lipase, wherein the phospholipase at least contains one of phospholipase A1, phospholipase A2 and phospholipase B; (2) heating the degummed vegetable oil to 80-90 DEG C and carrying out heat preservation for 30-45 minutes; and (3) separating a reaction product and recovering an oil phase to obtain the degummed vegetable oil. The degumming treatment is carried out by phospholipase under the assistance of the partial glyceride lipase, so that a reaction product is easy to separate, and the degummed oil is high in yield, and has the advantages of continuous operation and good degumming effect.

The invention provides a recombinant Escherichia coli, and a method for preparing phospholipase A1 through using the recombinant Escherichia coli. A gene-recombinant Escherichia coli BL21(DE3)/pET-pla CCTCC M 2012423 with the phospholipase A1 from liquefied Serratia liquefaciens CICC No.21538 is successfully constructed in the invention, and undergoes liquid fermentation to prepare hemolytic phospholipase A1, and the preparation method of the hemolytic phospholipase A1 comprises the steps of inclined plane culture, seed culture, autonomous induction culture (comprising permeable substance addition), and crude enzyme liquid extraction. The method for preparing the phospholipase A1 through the recombinant Escherichia coli has the advantages of high enzyme yield, high enzyme activity, simple production technology, short production period, low cost, easy technological amplification and the like, and can be widely applied to the grease refining field, the phosphatide modification field and the like.

The invention discloses a method for preparing diglyceride from phosphatidase A1 (Lecitase Ultra) through catalytic esterification, which comprises the following steps: (1) obtaining substrates after mixing fatty acid and glycerin according to a mol ratio of 0.5/1 to 2.5/1; and sequentially adding phosphatidase A1 and de-ionized water into the substrates to obtain reactant, wherein the addition of the phosphatidase A1 meets the requirement of adding 50 to 120 U phosphatidase A1 into each gram of the substrates, and the addition of the de-ionized water accounts for 4.0 to 12.0 wt percent of the mass of the substrates; (2) controlling the temperature between 30 and 55 DEG C under the condition that the reactant is in the vacuum, stirring the materials for reaction for 4 to 16h to obtain reaction liquid; and carrying out centrifugation delamination on the reaction liquid to obtain coarse diglyceride at the upper layer; and (3) carrying out molecular distillation on the coarse diglyceride under the conditions of the temperature between 160 and 165 DEG C and the pressure between 0.3 and 1.0 Pa to remove unreacted fatty acid and obtain the diglyceride.

The invention provides a phospholipase D acquired based on a gene mining method, as well as a gene coding sequence and application method thereof. A phospholipase D gene has a full length of 1,614bp, encodes 538 amino acids, uses plasmid pET28a (+) as an expression vector, and uses E. coli BL21 (DE3) as an expression host, to realize efficient expression of phospholipase D. The phospholipase D gene is simple and convenient in gene mining method; a recombinant strain constructed by the mined target gene can be fermented and induced to excrete the phospholipase D. For the phospholipase D, an optimum reaction temperature is 60 DEG C; an optimum reaction pH is 7.5; and Ca<2+> has good activating and promoting effects on enzyme activity of the phospholipase D; the phospholipase D can modify phospholipids, and can catalyze substrates phosphatidylcholine and L-serine to synthesize phosphatidylserine, thereby having good application prospects in food, medicine and healthcare industries.