Papers by Author: Xin Yang

Abstract: AIM：To investigate the chemical constituents of Illicium dunnianum. METHODS: A series of flavonoids were isolated and purified by various chromatographic techniques and their structures were elucidated by physicochemical and spectral data. RESULTS: Ten known flavonoids were isolated and identified as isoliquiritigenin (1), 7, 4′-Dihydroxy-5-methoxy flavanone (2), 3-(2, 4-dihydroxybenzyl)-5,7-dihydroxychroman-4-one (3), (3R)-5, 7-dihydroxy- 3-(4-hydroxybenzyl)- 6-methyl-chroman-4-one (4), 2, 5-dihydroxy-7-hydroxymethyl isoflavone (5), galangin (6), pinocembrin (7), kaempferol (8), 5,7,3′,4′-tetramethoxy catechin (9) and isorhamnetin (10). All of the compounds were isolated from this species for the first time.

Abstract: In this study, we report one-pot biological fabrication of gold nanoparticles by a facile procedure using lixivium of Syzygium samarangense leaf without extra surfactant, capping agent, and/or template. The resulting gold nanoparticles showed good performance in the catalytic reduction of 4-nitrophenol.

Abstract: An anaerobic solid state fermentation (ASSF) of porcine blood by two ferment agents was investigated. The free amino acids (FAA) content was applied as reference indicator, response surface design of Box-Behnken (BBD) was used to select the optimum conditions of ASSF of porcine blood. The optimum conditions were determined as porcine blood moisture of 76.0%, fermentation time of 7d, fermentation temperature of 39.0±0.5 oC, addition of the components of the mixture as follows: wheat bran 10.8 g , corn flour 1.2 g, Active 99 ferment agent I 0.768 g, Active 99 ferment agent II 0.19 g, porcine blood 86.0 g, resulting in FAA content of 23.8 mg/g. Evaluation experiments revealed that FAA content of 22.9 mg/g, which was 96.2% of the predicted value using Eq.2, and achieved a 14-fold increase comparing with the 1.5 mg/g which is the FAA content of unfermented mixture. It was confirmed that the protein of porcine blood was degraded into small peptides by Sodium dodecyl sulfate - polyacrylamide gel electrophoresis (SDS-PAGE).