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Sulfonated and sulfated lignans/neolignans from an aqueous extract of Isatis indigotica roots
Jia-Yi Feng1, Yu-Feng Liu1, Xiao-Qiang Lei1
1State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China.
Abstract:
Five sulfonated and sulfated lignans/neolignans (1-5), together with a neolignan analogue (6), were isolated from an aqueous extract of the Isatis indigotica roots (ban lan gen). Their structures were determined by spectral data analysis in combination with electronic circular dichroism (ECD) and NMR calculations. Among the isolates, 1 and 2 are sulfonated 7,9'-epoxylignans, while 3-5 are either sulfated or sulfonated 4',7-epoxy-8,3'-neolignans. In the preliminary bioassay, 2 and 3 exhibited moderate inhibitory activities against TGF-β induced HSC-T6 cell activation.
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