期刊
JOURNAL OF LIQUID CHROMATOGRAPHY & RELATED TECHNOLOGIES
卷 28, 期 12-13, 页码 2017-2028出版社
TAYLOR & FRANCIS INC
DOI: 10.1081/JLC-200063660
关键词
HSCCC; ethnobotanicals; bioactivity; bioassay-directed fractionation; bioassay-guided fractionation; natural products; drug discovery
Current paradigmatic approaches towards the identification of bioactive principles are built on a cyclic process known as bioassay-guided fractionation (BAGF). In our efforts to evaluate anti mycobacterial leads from the ethnobotanical fundus of Alaska (Oplopanax horridus) and the Central-South Asian International Conservation and Biodiversity Group (ICBG) project (Litsea mollifolia, Dubanga grandiflora), a strategy involving countercurrent chromatography (CCC) of crude extracts improves the significance and prioritization power of early BAGF steps. One major factor is the high individual resolution of CCC having a small polarity window of separation, and leading to sharp individual resolution between constituents. The proposed strategy involves the CCC-based primary fractionation of extracts for two principal cases. Firstly, when working with unknown active constituents, the crude extract is divided into three main groups A (K < 0.5), B (0.5 < K < 2), and C (K > 2). As a result, the bioactivity pattern is restricted to 8 possibilities due to the nature of the separation, with a bioactive mass reduction of ca. 50-70%, depending on the extract and choice of solvent system. Secondly, when working with bioactivity targets, the polarity window can be specifically chosen around the lead constituent, resulting in significant enrichment of activity of 90% (w/w) or better.
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