作者:Hye Sook Kang、Hae Young Chung、Jee Hyung Jung、Byeng Wha Son、Jae Sue Choi
DOI:10.1248/cpb.51.1012
日期:——
A new phlorotannin, named eckstolonol (1), was isolated from the EtOAc soluble fraction of the methanolic extract of the brown alga, Ecklonia stolonifera OKAMURA, along with three known phlorotannins, eckol (2), phlorofucofuroeckol A (3), and dieckol (4). The structure of eckstolonol was identified as 5,8,13,14-tetraoxa-pentaphene-1,3,6,9,11-pentaol on the basis of spectroscopic evidence. The new compound was found to be a radical scavenger on the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical.
从棕色藻类 Ecklonia stolonifera OKAMURA 的甲醇提取物的乙醇可溶部分中分离出了一种新的绿单宁,命名为 eckstolonol (1),同时分离出的还有三种已知的绿单宁,即 eckol (2)、phlorofucofuroeckol A (3) 和 dieckol (4)。根据光谱证据,确定了 eckstolonol 的结构为 5,8,13,14-四氧杂-1,3,6,9,11-五酚。研究发现,这种新化合物是 1,1-二苯基-2-苦基肼(DPPH)自由基的清除剂。