56 results about "Alpha-oxoglutarate" patented technology

The invention discloses L-d-glutamic oxidase with substrate specificity and alpha-oxoglutarate produced by catalysis of the same, and belongs to the field of enzyme-method catalytic production of fine chemicals. The invention has the advantages that the L-d-glutamic oxidase which only has the substrate specificity to L-glutamic acid, L-sodium glutamate and glutamine is utilized, 20g/L L-sodium glutamate solution is added in fermented liquid which is fermented for 60 hours and contains the L-d-glutamic oxidase, carrying out conversion for 12 hours under the ventilating condition and the conditions that the temperature is 30 DEG C, the pH is 8.5 and the 5% (v/v) isopropyl alcohol, and measured by a high-performance liquid chromatography, the content of alpha-oxoglutarate reaches 14.5g/L.

The invention discloses an identification method of aliphatic chain isomer alpha-oxoglutarate and 1,3-acetone dicarboxylic acid. The identification method is characterized by comprising the following steps that with an H<2>SO<4>-KIO<3>-[NiL](ClO<4>)<2>-MA-H<2>O<2> nonlinear chemical oscillation system as an identification solution, differential identification of the aliphatic chain isomer is realized according to an oscillation response of the system generated by the aliphatic chain isomer; L in [NiL](ClO<4>)<2> is 5, 7, 7, 12, 14, 14-hexamethyl-1, 4, 8, 11-tetraaza tetradecyl-4, 11-diene. An oscillation map provided by the identification method is relatively high in intuition; moreover, the aliphatic chain isomer alpha-oxoglutarate and 1,3-acetone dicarboxylic acid can be conveniently and quickly identified, and the method can also be widely used in other isomers; in addition, identification equipment is simple, high in accuracy and easy to operate and observe.

The invention discloses a method for producing a phenyllactic acid through whole-cell transformation of phenylalanine, and belongs to the technical field of enzyme engineering. The method successfullyconstructs an L-amino acid deaminase, L-lactic dehydrogenase and formate dehydrogenase co-expressed strain. Phenyllactic acid of 30 g/L is produced through the whole-cell transformation of phenylalanine, and the transformation rate is 100%. The establishment of a whole-cell transformation system solves the problems of complicated steps, low yield and environment pollution in the chemical synthesis of the phenyllactic acid as well as the problem of low transformation rate in the production of the alpha-oxoglutarate through the enzymatic conversion, the phenyllactic acid is produced through a one-step method at high yield without pollution, and a certain theoretical foundation is laid for the subsequent industrial production.

The invention discloses recombinant Escherichia coli and application of the recombinant Escherichia coli in synthesizing 3-hydroxypropionic acid. The recombinant Escherichia coli is formed by glycerol dehydratase genes dhaB123, glycerol dehydratase reactivating factor genes gdrA, alpha-oxoglutarate semialdehyde dehydrogenase mutant coding genes TUkgsadh and glycerol-3-phosphate dehydrogenase coding genes gpdl which are guided into host bacteria. By means of the gene knockout technique, the yield of byproduct 1,3-propylene glycol is reduced, and meanwhile, cofactors NAD+ of aldehyde dehydrogenase are regenerated. Thus, the yield of the 3-hydroxypropionic acid is improved by 1.5 times.

The invention relates to an aspartate amino transferase (AST) detection kit and belongs to the technical field of clinic in vitro diagnostic reagents. The invention aims to provide the aspartate amino transferase detection kit with capability of effectively eliminating endogenous alpha-oxoglutarate interference and high stability in order to achieve more accurate and reliable determination results of aspartate amino transferase. The kit provided by the invention comprises a reagent 1 and a reagent 2, wherein the reagent 1 comprises the following components: Tris-HCl buffer solution, L-asparaginic acid, reduction coenzyme (NADH), malic dehydrogenase (MDH), enzyme protective agent, stabilizer and preservative, and the reagent 2 comprises the following components: Tris-HCl buffer solution, alpha-oxoglutarate, a stabilizer and a preservative. The enzyme protective agent and the stabilizer are added into the AST detection kit provided by the invention so that the stability of the aspartate amino transferase detection kit is promoted; the aspartate amino transferase detection kit is suitable for various full-automatic biochemical analyzers; the operation is simple and safe; the aspartate amino transferase detection kit has convenience in clinical application and popularization.

The invention discloses a textile chitosan coating additive with color gradual changeability along with time passing and a preparation method thereof. The composition comprises, by weight, 140-180 parts of high-molecular chitosan, 140-180 parts of chitosan fibers, 3-5 parts of sodium alginate, 4-5 parts of ethylene diamine tetra(methylene phosphonic acid), 4-5 parts of hyaluronic acid, 5-6 parts of a pigment 1, 5-6 parts of a pigment 2, 0.1-0.3 parts of nanometer TiO2, 3-5 parts of a TPP ion cross-linking agent, 2-3 parts of a hydrophobic essence material, 1-2 parts of alpha-oxoglutarate and a proper amount of water. Different chitosans coat different pigments and the coated product is used as a textile dye additive. Chitosan is degraded along with time passing and the textile color is gradually changed so that the dual purposes are realized and textile color diversity and durability are realized.

The invention discloses a feed additive for improving growth properties of weaned piggies and improving functions of intestinal tracts as well as a preparation method and application of the feed additive, and relates to the field of pig feeds. The feed additive provided by the invention comprises the following components in parts by weight: 5-10 parts of sodium glutamate, 5-8 parts of arginine, 5-10 parts of tributyrin, 5-8 parts of glutamine, 10-20 parts of glucose, 5-10 parts of alpha-oxoglutarate, 20-30 parts of calcium formate and 4-45 parts of zeolite powder. After the feed additive provided by the invention is fed to the weaned piggies, the height of villi of the weaned piggies can be increased, the depth of crypts is increased, the atrophy of intestinal villi is alleviated, the functions of the intestinal tracts are improved, reduction or avoidance of diarrhoea of the weaned piggies is facilitated, the growth and the development of the weaned piggies are promoted, and the growth properties of the weaned piggies are improved.

The invention relates to a natural and safe growth-type feed additive which contains L-arginine-alpha-oxoglutarate, wherein the L-arginine and alpha-oxoglutarate are salified in the mole ratio of 1:2-5:1 and the weight ratio of the L-arginine-alpha-oxoglutarate added to the feed and the daily ration for animals to the feed and the daily ration for animals is 1:50-200. The weight ratio of the additive to the feed is 1:50-100 for livestock animals, 1:100-200 for poultry animals and 1:50-100 for aquatic animals.

The invention discloses a method for promoting fermentation of microorganism to produce 1, 3-propylene glycol. The method comprises a seed liquid cultivation process and a fermentation process, wherein fermentation cultivation medium used in the fermentation process contains pyroracemic acid of which the concentration is 0.1-0.4g/L and/or alpha-oxoglutarate; the fermentation process orderly comprises micro-oxygen fermentation and anaerobic fermentation, and the micro-oxygen fermentation is converted into the anaerobic fermentation when an OD value is greater than 7. According to the method, conversion of glycerol can be effectively promoted, and the concentration of the 1, 3-propylene glycol in a final product is greatly improved.

The invention relates to an artificial feed capable of meeting the requirement of growth and development of a natural enemy of longicorn beetle pest, namely dastarcus longulus sharp larva with the age of two years or more than two years, which is prepared from materials of amino acids of alanine, arginine, aspartic acid and the like, glucose, sucrose, biotin, choline chloride, vitamin, riboflavin, sodium chloride, malic acid, alpha-oxoglutarate, fumaric acid, a longicorn beetle larva extract, a yeast powder solution, a malt extract, fresh milk, peptone, egg yolk, new-born calf serum, chloromycetin and the like. Indoor feed experiments prove that dastarcus longulus sharp fed by the feed has an average growth period of 9.500+/-0.548 days, and a mature larva has a body length of 9.642+/-0.732 mm, and can normally spin cocoons and pupate with an eclosion rate of 95 to 100 percent.

The invention discloses a detection kit for measuring the content of urea without the interference of endogenous ammonia in serum. The detection kit comprises a reagent R1 and a reagent R2, wherein the reagent R1 contains 1-500mmol/L buffer solution with the pH value of 3.0-8.0, 1-80KU/L glutamate dehydrogenase, 0.5-2KU/L NADH, 1-100mmol/L alpha-oxoglutarate, 0.1-0.5% of a surface active agent and 0.1-1g/L of preservative; the reagent R2 contains 1-500mmol/L buffer solution with the pH value of 3.0-8.0, 1-60KU/L urease, 0.5-2KU/L NADH, 1-100mmol/L alpha-oxoglutarate, 10-500mmol/L sodium chloride, 1-50mmol/L enzyme protective agent, and 0.1-1g/L preservative. The kit can eliminate the interference of the endogenous ammonia and has the characteristics of excellent stability and strong anti-interference ability.

The invention provides construction of high-yield trans-4-hydroxyproline sucA gene knockout bacteria and discloses a biosynthesis method of trans-4-hydroxy-L-proline through gene knockout. According to the method, the gene suc A is knocked out on the basis of escherichia coli BL21(DE3) delta put A, the process that alpha-oxoglutarate generates succinic acid or an alpha-oxoglutarate dehydrogenase complex is utilized for catalyzing in the TCA circulation process is disturbed, meanwhile, the trans-4-hydroxy-L-proline hydroxylase gene (hyp) is inserted, and then plasmid pUC19-Ptrp2-hyp-vgb is converted; hydroxylase replaces functions of alpha-ketoglutaricdehydrogenase, 'anaplerosis' is conducted on the TCA circulation process, and it is guaranteed that hydroxyproline is generated while the TCA circulation is conducted. The invention further discloses application of recombinant escherichia coli to production of trans-4- hydroxyproline, it is indicated by the flask shaking fermentation result that the yield of hydroxyproline obtained after mediumoptimization is 1344.1 mg/L and is about 5.53 times that before optimization; compared with original bacteria which are converted into the plasmid pUC19-Ptrp2-hyp-vgb in the same mode, advantages are achieved on the aspect of production of hydroxyproline.

The invention discloses Yarrowia lipolytica capable of reinforcing precursor supply to enhance synthesis of alpha-oxoglutarate, belonging to the technical field of metabolic engineering. According to the invention, catalytic activity of a pyruvate dehydrogenase E1 component in a cell is improved through overexpression of PDA1, so the accumulation of an intermediate metabolite pyruvic acid is decreased, and supply of intracellular acetyl-CoA is reinforced; moreover, supply of intracellular acetyl-CoA is increased for accumulation of alpha-oxoglutarate for cells, which enables extracellular accumulation of alpha-oxoglutarate to be obviously increased. Thus, overexpression of PDA1 enables the content of the intermediate metabolite pyruvic acid to be decreased and accumulation of alpha-oxoglutarate to be reinforced and provides novel thinking for accumulation of organic acid in TCA cycle for cells.

The invention relates to the technical field of in-vitro diagnostic reagents, in particular to a stabilizing agent for a uric-acid detection reagent. The stabilizing agent is characterized by being prepared from the following components in parts by weight: 0.1-5g/L of MgSO4, 1-5ml/L of glycerinum, 0.1-20g/L of trehalose, 0.1-10ml/L of PEG (Polyethylene Glycol) 4000, 0.1-5g/L of adenosine diphosphate, 1-4g/L of alpha-oxoglutarate, 0.5-2g/L of polyvinylpyrrolidone and 0.5-2.0g/L of polyethyleneimine. The stabilizing agent for the uric-acid detection reagent has the advantages that the effective period of the uric-acid detection reagent can be obviously prolonged to 2 years, the stability after opening lasts for 3 months, a blank absorbency value is obviously reduced, single-reagent operation is simple, the result is accurate, and the stability is good.

The invention discloses a liquid monomer reagent for determining the content of ammonia in blood serum, a preparation method and an application thereof. The liquid monomer reagent comprises the following components: buffering solution, glutamate dehydrogenase, alpha-oxoglutarate, reduction type nicotinamide adenine dinucleotide, glucose, glucose dehydrogenase and a stabilizing agent, wherein the enzyme activity ratio of the glutamate dehydrogenase and the glucose dehydrogenase is (3-3000):1. Shown by accelerating destruction test at the temperature of 37 DEG C and 42 DEG C, the blood-ammonia liquid monomer reagent is good in stability, solves the fussy problem that a lyophilized agent needs to be lyophilized and redissolved, can be prepared and used at any time, and can be stable for 18 mouths at the temperature of 2-8 DEG C; and shown by clinic correlation test, the liquid monomer reagent is stable in blood-ammonia determination, is high in determined-value accuracy, is applicable to manual, semi-automatic and automatic detection system and is easily promoted and used in all hospitals.

The invention relates to a strain MQO-160 for generating L-glutamate oxidase and application of the strain. The strain MQO-160 has the preservation number of CGMCC No.12892, the preservation organization of the China General Microbiological Culture Collection Center, the preservation date of August 22nd, 2016 and the preservation address of the apartment No.3 of the yard No.1 in the Beichen West Road in Chaoyang District of Beijing. The invention further comprises the application of the strain MQO-160 to preparation of L-glutamate oxidase. The bottleneck defect of generating alpha-oxoglutarate through an L-glutamate oxidase conversion method is overcome, and the strain MQO-160 is low in price, easy to obtain, simple in process and high in product purity.

The invention discloses a biosynthesis method for increasing the yield of trans-4-hydroxyproline by knocking out other metabolic pathways. A system for producing hydroxyl-L-proline by using the biosynthesis method refers to a production method that free L-proline is converted into trans-4-hydroxyl-L-proline from a living body by virtue of proline hydroxylase in biological cells in the presence of alpha-oxoglutarate and ferrous ions. The method for increasing the yield of hydroxyproline comprises a step of cutting off other metabolic pathways of a precursor substrate glutamic acid which competes with L-proline in biological cells, wherein other metabolic pathways refer to an arginine metabolic pathway. By using the method, the yield of the trans-4-hydroxyl-L-proline can be up to 921 mg/L.

The invention discloses markers, a reagent and a reagent box for indicating the directional differentiation potential of mesenchymal stem cells (MSCs), in particular to markers, a reagent and a reagent box for indicating the potential that bone mesenchymal stem cells (BMSCs) directionally differentiate into cardiomyocyte-like cells. The makers are composed of alpha-oxoglutarate, dihydroxyacetone phosphate, asparagines and arachidonic acid. Results prove that the alpha-oxoglutarate, the dihydroxyacetone phosphate, the asparagines and the arachidonic acid are quite high in united indicating value, can be used as the markers for indicating the potential that the BMSCs differentiate into cardiomyocytes, and are high in efficiency when used for high throughput screening of inducers capable of inducing the BMSCs to differentiate into the cardiomyocytes, and people do not need to wait for several weeks to know an induction result.

Under participation of ATP, HCO3 and Mg, urea is hydrolyzed by urea amidolyase (UAL; EC 3.5.1.45) to generate NH4, HCO3, ADP and Pi. K is activator of UAL enzyme, and activation speed of the UAL enzyme is proportional to concentration of the K. A auxiliary reaction is coupled, NH4 generated by the UAL enzyme reacts with alpha-oxoglutarate, NAD and Glutamate dehydrogenase (GLDH) to generate glutamate and NAD, and under 340 nm wavelength, descent rate of the NADH is proportional to concentration of the K. Concentration of the K is calculate by the descent rate of the NADH. The invention applies the reaction to clinic in vitro determination potassium reagent, and provides optimum double-reagent composition to make stability, accuracy and precision of the agent to optimal state.