10 results about "Saccharic acid" patented technology

The application discloses genetically engineered bacteria for synthesizing L-tryptophan and application thereof. The application realizes the following through two key gene regulation strategies (serA down-regulation and serB up-regulation): the accumulation amount of glutamic acid by-products is significantly reduced from 8-20 g / L to below 1.14 g / L, and the reduction ranges are 87.74% and 90.3% respectively; the sugar acid conversion rate (glucose / L-tryptophan) of L-tryptophan is increased from 19.2% to 20.9% and 21.3% respectively; without additional addition of expensive cofactors or inducers, the cost-effectiveness is significant.

The application discloses a preparation method and application of chitooligosaccharide alduronic acid and belongs to the technical field of marine bioengineering. The preparation method comprises the following steps: after beta-chitin and a cleaving polysaccharide monooxygenase SmLPMO10 are dissolved in a Tris-hydrochloric acid buffer solution, a reducing agent is added, and an enzymatic reaction is carried out; after the reaction is carried out for 24 hours, the reducing agent is supplemented, the reaction is continuously carried out, the reducing agent is supplemented once every 24 hours, after the reaction is carried out for 96 hours, supernatant is obtained by filtration, and the chitooligosaccharide alduronic acid is obtained after inactivation, centrifugal removal of supernatant, desalination and freeze-drying. The chitin can be cleaved by using a single cleaving polysaccharide monooxygenase, without additional addition of chitinase, and the reaction condition is mild, so that the generation of by-products and environmental pollution are avoided. The application provides an environment-friendly preparation method of chitooligosaccharide alduronic acid, and the research and development of a green conversion technology of chitin and chitin-like biomass resources are greatly promoted.

This invention discloses a method for the biosynthesis of high-purity L-threonate magnesium, belonging to the field of food fortification agents and biochemical synthesis technology. The invention uses L-xylorate calcium solution as a substrate, and obtains a purified L-threose solution through oxidative cleavage. Then, a complex dehydrogenase system composed of arabinose dehydrogenase, xylose dehydrogenase, and aldose dehydrogenase synergistically catalyzes the oxidation of L-threose to L-threonate. Finally, L-threonate magnesium is prepared by salt formation with magnesium hydroxide, crystallization, and drying. The purity of the obtained product is greater than 99.0%, the oxalic acid residue is less than 0.01%, the process is safe and environmentally friendly, and suitable for industrial production.

This invention belongs to the field of biodegradable material modification, specifically relating to a basic magnesium sulfate whisker-reinforced polylactide composite, its preparation method, and its applications. The basic magnesium sulfate whisker-reinforced polylactide composite of this invention comprises the following components by mass fraction: 80-97.5% gluconolactone-modified polylactide and 2.5-20% basic magnesium sulfate whiskers. The basic magnesium sulfate whisker-reinforced polylactide composite provided by this invention possesses high modulus and rigidity, exhibiting early defect support and ligation fixation functions. It gradually degrades and is absorbed and replaced by tissue. The degradation components provide various organic components that promote tissue regeneration, enhancing tissue regeneration and reconstruction. Its degradation rate can be controlled according to the composition to match tissue regeneration and reconstruction. During use, it reduces surgical infections caused by bacterial infection and inflammation, such as redness and swelling, and exudation. It has wide applications in surgical ligation fixation, defect repair, short-term fixation, and isolation.

The application relates to the field of biomass conversion, and discloses a noble metal catalyst, a preparation method and application thereof, and a preparation method of a biomass-based carboxylic acid polymer monomer. The catalyst comprises a carrier and an active component loaded on the carrier, the active component comprises noble metal and rhenium, and the carrier is a carbon nanotube; wherein the dispersion degree of the noble metal is 40-60%. The noble metal catalyst has the advantages that the dispersion degree of the noble metal is high, the hydrogen reduction condition is mild, the catalyst is used for preparing adipic acid from saccharic acid under a water system, the saccharic acid conversion rate is high, the selectivity of the adipic acid is high, and the reaction is green and environment-friendly.

Methods and consumer products for detecting a metabolite, the method comprising: testing a urine sample from a subject for a metabolite selected from the group consisting of ascorbate, dehydroascorbate, CEHC-sulfate, CEHC-taurine, CEHC-glucronide, pantoate, 5-amino valerate, galactonate, phenylacetylalanine, methylcatecholsulfate, phenylacetylglutamine, carboxysuccinate, carboxyethylvaline, arabinose, threonate, methylcrotonylglycine, glucuronate, carboxyethylisoleucine, glycoursodeoxycholate, leucylalanine, lithocholatesulfate, alio-threonine, cholic, glucuronide and combinations thereof; and producing a metabolic profile for the metabolite.

This invention belongs to the field of bio-fermentation technology and discloses a method for improving glutamic acid fermentation using nutrients, which includes the following steps: adding nutrients containing vitamin V during the fermentation process. A1 Nutrients containing valine. This invention combines vitamin A and valine in glutamic acid fermentation, which can improve strain activity and yield, and further enhance the fermentation efficiency and sugar-acid conversion rate of glutamic acid.

The object of the present invention concerns a hair restructuring association comprising or alternatively consisting of: (a) a quaternary ammonium salt of formula (I) and (b) at least one sulpho-derivative of vegetable fatty acids, wherein R5, R6 are independently chosen between hydrogen and a radical R0, R0 consists of the following structure of formula (II), R1 is chosen from the group consisting of: hydrogen, methyl, isopropyl, sec-butyl, isobutyl, ethylenemethylthio, benzyl, para-hydroxybenzyl and 3-methylene-1H-indole, R2, R3, R4 are independently chosen from the group consisting of: methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl and tert-butyl, mX− is chosen from the group consisting of: formic acid, acetic acid, unsaturated monocarboxylic acids, adipic acid, aldaric acid, oxalic acid, phthalic acid, azelaic acid, sebacic acid, malonic acid, succinic acid, tartaric acid, glutaric acid, pimelic acid, maleic acid, malic acid, fumaric acid and suberic acid, isocitric acid, citric acid, fatty acids, acidic amino acids, keto acids and aromatic carboxylic acids, m is an integer number comprised between 1 and 22, n is comprised between 2 and 20.