Mapping the hydrolytic and synthetic selectivity of a type C feruloyl esterase (StFaeC) from Sporotrichum thermophile using alkyl ferulates
摘要:
The active site of Sporotrichum thermophile type C feruloyl esterase (StFaeC) was probed using a series Of C-1-C-4 alkyl ferulates. The affinities for straight and branched alkyl ferulates were demonstrated by the K-m values of 1.64-0.51 and 0.19-0.1, respectively. Comparison of k(cat), and k(cat)/K-m values shows that the enzyme hydrolyzed n-propyl ferulate faster and iso-propyl ferulate more efficiently. Alkyl ferulates were applied also for substrate selectivity mapping of feruloyl esterase to catalyze feruloyl group transfer to L-arabinose, using as a reaction system a ternary water-organic mixture consisting of n-hexane, t-butanol and water. Lengthening the aliphatic side chain was the most significant factor causing lower synthetic activity of the enzyme. The reaction parameters affecting the feruloylation rate and the conversion of the enzymatic process, such as the temperature and substrate concentration have been investigated. Under identical reaction conditions, the enzyme feruloylated other monosaccharides such as D-arabinose, D-glucose, D-xylose, D-Mannose, D-fructose, D-galactose, D-ribose and model substrates such as 4-nitrophenyl alpha-L-arabinofuranoside and 4-nitrophenyl alpha-L-arabinopyranoside. (C) 2004 Elsevier Ltd. All rights reserved.
Mapping the hydrolytic and synthetic selectivity of a type C feruloyl esterase (StFaeC) from Sporotrichum thermophile using alkyl ferulates
摘要:
The active site of Sporotrichum thermophile type C feruloyl esterase (StFaeC) was probed using a series Of C-1-C-4 alkyl ferulates. The affinities for straight and branched alkyl ferulates were demonstrated by the K-m values of 1.64-0.51 and 0.19-0.1, respectively. Comparison of k(cat), and k(cat)/K-m values shows that the enzyme hydrolyzed n-propyl ferulate faster and iso-propyl ferulate more efficiently. Alkyl ferulates were applied also for substrate selectivity mapping of feruloyl esterase to catalyze feruloyl group transfer to L-arabinose, using as a reaction system a ternary water-organic mixture consisting of n-hexane, t-butanol and water. Lengthening the aliphatic side chain was the most significant factor causing lower synthetic activity of the enzyme. The reaction parameters affecting the feruloylation rate and the conversion of the enzymatic process, such as the temperature and substrate concentration have been investigated. Under identical reaction conditions, the enzyme feruloylated other monosaccharides such as D-arabinose, D-glucose, D-xylose, D-Mannose, D-fructose, D-galactose, D-ribose and model substrates such as 4-nitrophenyl alpha-L-arabinofuranoside and 4-nitrophenyl alpha-L-arabinopyranoside. (C) 2004 Elsevier Ltd. All rights reserved.
In order to discover new compounds with antiplatelet aggregation activities, some ferulic acid (FA) derivatives were designed and synthesized. The in vitro antiplatelet aggregation activities of these compounds were assessed by turbidimetric test. The results showed that the target compound 7f had potent antiplatelet aggregation activity with its IC50 27.6 μmol/L, and 7f can be regarded as a novel potent
A highly efficient synthesis of alkyl ferulates under microwave irradiation is described. The time of these reactions ranged from 3 to 5 minutes, which was much shorter than the traditional synthetic methods, and the alkyl ferulates were obtained in higher yields.
An object of the present invention is to provide a liquid-crystal display element using a liquid-crystal composition having negative dielectric anisotropy, capable of realizing excellent display characteristics by being used in a liquid-crystal display element provided with a photo-alignment film, without deteriorating various characteristics as a liquid-crystal display element such as dielectric anisotropy, viscosity, a nematic phase upper limit temperature, nematic phase stability at low temperatures, and γ1, and burn-in characteristics of a display element. A liquid-crystal display element using a liquid-crystal composition containing at least one compound selected from the group consisting of compounds represented by the following General Formula (I) is provided.
Pharmaceutical composition for enhancing cognition
申请人:National Science Council
公开号:US20010053781A1
公开(公告)日:2001-12-20
The invention discloses a pharmaceutical composition for enhancing cognition, preventing and/or treating cognition disorders, including 50-100 mg/kg ferulic acid or a pharmaceutically acceptable salt or derivative thereof, and a pharmaceutically acceptable carrier or excipient. The pharmaceutical composition is useful in the treatment of disorders of learning acquisition, memory consolidation, and retrieval.