ABSTRACT
Objective To explore the influence of montelukast on plasma nitric oxide in preschool children with asthma.Methods Forty-four preschool children with asthma aged 2-5 years who firstly met a criterion of asthma and treated 4 weeks with montelukast were investigated;and nitric oxide levels of plasma were inspected respectively before treatment and after treatment 1 week,4 weeks.Results The level of nitric oxide in the plasma of asthmatic children was obviously higher than that in normal control group(P
ABSTRACT
A novel reaction-enzymatic ammonolysis discovered in the mid of 1990s has been demonstrated to be a very promising alternative in the preparation of optically pure compounds. The effects of organic solvent, initial water activity, temperature and additives on lipase Novozym435-catalyzed enantioselective ammonolysis of racemic phenylglycine methyl ester were investigated systematically in this paper. Enzymatic reaction of ammonolysis showed higher activity and enantioselectivity than the corresponding reaction of hydrolysis and alcoholysis.
Subject(s)
Alcohols , Ammonia , Catalysis , Dimethylformamide , Pharmacology , Esters , Glycine , Metabolism , Hexoses , Pharmacology , Hydrolysis , Lipase , Metabolism , Organic Chemicals , Solvents , Surface-Active Agents , Pharmacology , Temperature , WaterABSTRACT
Enzymatic hydrolysis of nitrile was performed under mild conditions and afford high efficiency and selectivity,thus being highly potential for the synthesis of optically active carboxylic acids and their derivatives.The type of nitrile-hydrolyzing enzymes and hydrolysis reactions,reaction characteristics,factors influencing the hydrolysis and the prospect for its application to industrial production were reviewed in this paper.