Twenty-three phenolics including six new compounds were isolated from a commercial liquorice from North-eastern China. Structures 2-7 were assigned for the new compounds, designated as tetrahydroxy-methoxychalcone, isolicopyranocoumarin, glycyrrhiza-flavonol A, and glycyrrhiza-isoflavones A, B and C, respectively. Compound 2 showed the most potent scavenging effect on 1, 1-diphenyl-2-picrylhydrazyl radical among the tested polyphenols isolated from liquorice. Air-oxidation of 2 in alkaline dimethylsulfoxide solution gave strong ESR signals, indicating the stability of the radical species formed from 2.
从东北地区的商业甘草中分离出23种
酚类化合物,包括6种新化合物。新化合物的结构分别为2-7,分别命名为四羟基甲氧基
查尔酮、异
吡喃
香豆素、
甘草黄酮醇A、甘草
异黄酮A、B和C。在从甘草中分离出的多
酚类化合物中,化合物2对1,1
-二苯基-2-苦基
肼自由基的清除效果最强。在碱性
二甲基亚砜溶液中,化合物2的空气氧化作用产生了强烈的ESR信号,表明由化合物2形成的自由基物种具有稳定性。