4 results about "Cyclohexylacetic acid" patented technology

This invention discloses a method for preparing and analyzing trans-4-aminocyclohexylacetic acid. The preparation method is as follows: 4-nitrophenylacetic acid undergoes catalytic hydrogenation in a solvent, followed by filtration. The filtrate is then treated with acid to obtain a 4-aminophenylacetic acid salt solution. The collected catalyst is activated. The 4-aminophenylacetic acid salt solution is mixed with isopropanol, barium hydroxide, tetrabutylammonium bromide, 18-crown ether-6, and dibutyl phthalate. The activated catalyst is then added to initiate a catalytic hydrogenation reaction. After the reaction, the reaction solution is cooled and filtered. The resulting solid is mixed with a preheated dilute sulfuric acid solution and stirred to form a slurry. The mixture is then filtered, and the filtrate is neutralized and filtered again. The collected filtrate is concentrated and crystallized. The crystallized precipitate is washed and dried to obtain trans-4-aminocyclohexylacetic acid. The method provided by this invention has high reaction efficiency, mild conditions, and is suitable for industrial production. It yields high product purity and reliability. Furthermore, the analytical method provided by this invention is accurate and reliable.

The invention relates to the field of auxiliary frame connecting bushings, in particular to a high-wear-resistance anti-aging new energy auxiliary frame connecting bush and a preparation method thereof, and aims at solving the problems that an auxiliary frame connecting bush is insufficient in wear resistance, poor in anti-aging performance and the like. The preparation method comprises the following steps: by taking a modified polyurethane solution as a matrix, sequentially adding modified nano silicon dioxide, modified multi-walled carbon nanotubes and polytetrafluoroethylene micro powder, uniformly mixing through ultrasonic dispersion and mechanical stirring, adding an anti-aging agent and polypropylene glycol dicyclohexyl acetate step by step, and sequentially stirring and uniformly mixing, so as to obtain a finished product. And adding dicumyl peroxide as a cross-linking agent, stirring until the system is uniform, injecting into a mold, carrying out thermal insulation cross-linking and vacuum drying, and demolding to obtain the high-wear-resistance anti-aging new energy auxiliary frame connecting bushing. The high-wear-resistance anti-aging new energy auxiliary frame connecting bush has the characteristics of high wear resistance and aging resistance and excellent mechanical strength and use stability.

The invention belongs to the technical field of microorganisms, and particularly relates to a method for increasing the yield of monascus protein by using cyclohexyl acetic acid. Aiming at the problem that the protein production capacity of the monascus is still to be improved, the invention firstly discovers that the cyclohexyl acetic acid can improve the protein synthesis and accumulation capacity of the monascus and can improve the protein yield of the monascus by about 50%. The method provided by the invention has the advantages of simplicity and convenience in operation, low cost and the like, and provides a theoretical basis and practical guidance for optimization of monascus fermentation protein production.

The invention discloses a preparation method and application of a surface charge modified enzyme mutant and an adaptive immobilized enzyme. The enzyme is subjected to surface charge modification mutation and then is combined with MOFs to form the immobilized enzyme, so that the immobilized enzyme has better enzyme activity recovery rate, stability and reusability, and efficient synthesis of medicine or chemical intermediates can be realized; the intermediate can be used as a gabapentin intermediate, such as 1-cyanocyclohexyl acetic acid (nitrilase), a clopidogrel key intermediate (S)-chlorophenylglycine (esterase, acylase), a chemical intermediate (S)-1-methoxy-2-propylamine (transaminase) and the like; or efficient degradation of toxic substances, such as ricinine in castor bean meal, is realized.