New Screw Lactam and Two New Carbohydrate Derivatives from the Methanol Extract of Rice Bran

被引：9

作者：

Wang, Wei ^{[1
]}

Guo, Jia ^{[1
]}

Zhang, Junnan ^{[1
]}

Liu, Tianxing ^{[1
]}

Xin, Zhihong ^{[1
]}

机构：

[1] Nanjing Agr Univ, Coll Food Sci & Technol, Key Lab Food Proc & Qual Control, Nanjing 210095, Jiangsu, Peoples R China

来源：

JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY | 2014年 / 62卷 / 44期

关键词：

rice bran; structural identification; screw lactam; oligosaccharide derivatives; antioxidant and antimicrobial activities; GAMMA-ORYZANOL COMPONENTS; ANTIOXIDANT ACTIVITY; MOMILACTONE-B; DIETARY FIBER; HEALTH; OIL; PHYTOCHEMICALS; FRACTIONS;

D O I：

10.1021/jf5037273

中图分类号：

S [农业科学];

学科分类号：

09 ;

摘要：

A new screw lactam and two new carbohydrate derivatives, oryzalactam (1), oryzasaccharide A (2), and oryzasaccharide B (3), have been isolated from the methanol extract of rice bran together with four other known compounds, including momilactone A (4), butyl beta-d-xylopyranose (5), ethyl beta-d-xylopyranose (6), and methyl beta-d-xylopyranose (7). The structures of these compounds were determined using a combination of spectroscopic methods and chemical analysis. This work represents the first recorded example of the isolation of compounds 1, 2, 3, 5, 6, and 7 from rice bran. The antioxidant experiments revealed that compound 1 possessed strong ABTS(+) (ABTS = 2,2'-azinobis(3-ethylbenzthiazoline-6-sulfonic acid)) and DPPH (DPPH = diphenyl(2,4,6-trinitrophenyl) iminoazanium) radical scavenging with IC50 values of 33.38 +/- 1.58 and 40.20 +/- 1.34 mu M, respectively. Antimicrobial assays revealed that compound 4 showed high levels of selectivity toward Escherichia coli with a minimal inhibitory concentration value of 5 mu M.

引用

页码：10744 / 10751

页数：8

共 24 条

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