Biomedical subjects

Ping-Kai Ouyang

Publications and source records attributed to Ping-Kai Ouyang.

4 recordsLinked to original sources

PubMed2006

Enzymatic synthesis of (R)-cyanohydrins by a novel (R)-oxynitrilase from Vicia sativa L.

The defatted seed meal of common vetch (Vicia sativa L.) served as a source of (R)-oxynitrilase which catalyzed the enantioselective addition of HCN to aromatic, heteroaromatic, fluoro-substituted aromatic aldehydes to produce the corresponding enantiomeric pure cyanohydrins in yields of 52-100% and 88-99% ee at 12 degrees C under micro-aqueous medium (diisopropyl ether) without addition of buffer solution.

Aldehyde-Lyases↗

PubMed2006

[Determination of fatty acids and organic acids in Ranunculus ternatus Thunb using GC-MS].

The determination of fatty acids and organic acids in Chinese medicinal plant Ranunculus ternatus Thunb using GC-MS was studied. The Ranunculus ternatus Thunb from Henan province was cut into less than 20 mesh pieces, then extracted by petroleum ether or ether in refluxing and esteried, and finally was determined using GC-MS. The results show that there are 23 kinds of organic compounds in the Chinese medicinal plant Ranunculus ternatus Thunb from Henan, among which 15 kinds of fatty acids were identified, including myristic acid, palmitic acid, stearic acid, oleic acid, linolenic acid, eicosanoic acid, docosanoic acid etc. The unsaturated fatty acids and oleic acid account for 58.19% and 35.68% of the total organic compounds respectively. The kinds of fatty acid in petroleum ether extract and ether extract are the same.

Alkanes↗

PubMed2006

[Study on steroidal compounds from Dioscorea zingiberensis].

OBJECTIVE: To study the chemical constituents of Dioscorea zingiberensis. METHOD: Manifold chromatography methods were used to separate the chemical constituents, and the chemical stuctures were determined by spectral analyses. RESULT: 6 compounds were isolated from Dioscorea zingiberensis and identified as deltonin, protodeltonin, zingiberensis newsaponin, dioscin, 3-O-[beta-D-glucopyranosyl(1 --> 4)]-beta-D-glucopyranosyl-diosgenin, diosgenin. CONCLUSION: Deltonin and protodeltonin were isolated from this plant for the first time.

Dioscorea↗

PubMed2002

[Study on the kinetics of immobilized cells of Brevibacterium ammoniagenes MA-2 and Brevibacterium flavum MA-3].

The kinetics of immobilized cells of Brevibacterium ammoniagenes MA-2 and Brevibacterium flavum MA-3 cells were studied. By means of both a theoretical analysis of diffusion in the gel particles and an experimental determination of apparent kinetic parameters, the intrinsic kinetic parameters of immobilized cells of B. ammoniagenes MA-2 and B. flavum MA-3 cells were obtained.

Brevibacterium↗