5 results about "Cysteic acid" patented technology

The invention relates to bio-based taurine and a preparation method thereof, and the preparation method of the bio-based taurine comprises the following steps: mixing sulfoalanine with a ketone catalyst to carry out a decarboxylation reaction, and after the reaction is finished, carrying out separation and crystallization to obtain the bio-based taurine. According to the preparation method disclosed by the invention, the sulfoalanine is used as a raw material, the ketone catalyst is adopted for decarboxylation reaction, impurities are not easy to generate, the taurine can be obtained only through crystallization and purification, the operation is simple, the yield is relatively high, and industrial production is facilitated.

The presently claimed invention relates to dielectric polishing composition comprising (A) surface - modified colloidal silica particles comprising a negatively - charged group on the surface of the particles, wherein the surface-modified colloidal silica particles have a negative charge, a particle size of from 5 nm to 200 nm, and a zeta potential < -35 mV at a pH in the range of from ≥ 2.0 to ≤ 4.5; (B) at least one buffering agent selected from L-arginine, lysine, or histidine; (C) at least one iron (III) oxidizer; (D) at least one pH adjusting agent selected from 2-amino-2-methyl- propan-1-ol or phosphoric acid and salts thereof; (E) at least one stabilizer; (F) at least one corrosion inhibitor selected from formamidine sulfinic acid, L- cysteine, ethylene thiourea, thiourea, N-(4-pyridyl)thiourea), N-(n-propyl)thiourea, cysteine sulfinic acid, 4-aminobenzene-1- sulfinic acid, N-(2-mercaptopropionyl)glycine, 2-oxooxane-4-sulfonic acid, L-cysteic acid, 2- amino-thiobiuret, L-methionine, or homocysteine; and (G) an aqueous medium, wherein the pH of the composition is in the range of from ≥ 2.0 to ≤ 5.0.

The application discloses a dynamic supporting insole material based on a deformation response material and a manufacturing process thereof, and belongs to the technical field of high polymer materials. The application is used for solving the technical problem that the fatigue resistance, resilience and antibacterial performance of the dynamic supporting insole material in the prior art need to be further improved. The dynamic supporting insole material based on the deformation response material comprises a basic layer and a plurality of response units, and the plurality of response units are all embedded in the bottom of the basic layer in a gluing mode. The plurality of response units comprise the following components in weight parts: 90-94 parts of polyurethane, 4-6 parts of cysteic acid ester, 2-3 parts of functionalized microcrystalline cellulose, 1-2 parts of modified montmorillonite and 0.5-1.5 parts of auxiliary additives. The synergistic effect among the composite alcohol, the polyurethane, the cysteic acid ester, the functionalized microcrystalline cellulose and the modified montmorillonite prepared by the application further improves the fatigue resistance, resilience and antibacterial performance of the dynamic supporting insole material.

Processes for producing L-cysteic acid along with uses for the same. The process includes providing a reaction of O-phospho-L-serine (OPS) with a salt of sulfurous acid (sulfite) and a cysteate synthase (CS enzyme) belonging to enzyme class EC 2.5.1.76 in a biotransformation. Where a concentration of OPS in a batch is at least 1 g / L and the CS enzyme is produced in an enzymatically active form by growth of the microorganism strain E. coli K12 JM105. The biotransformation is carried out under active pH control and the CS enzyme has an amino acid sequence specified in SEQ ID NO: 4 or an amino acid sequence homologous thereto. Where an amino acid sequence homologous to SEQ ID NO: 4 has a sequence identity of at least 50% in relation to SEQ ID NO: 4 and, at the same time, cysteate synthase enzyme activity.

The invention relates to an improved process for the preparation of an N-retinoyl-L-cysteic acid methyl ester, or a pharmaceutically acceptable salt thereof. The improvements relate to the order in which the reagents are added during the reaction, the size of subsequent additions, and the choice of the solvent, allowing the product to be obtained in higher yields and at lower costs. The improved process also significantly simplifies the workup of the reaction product.