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Chromatographic resolution of glucosidic compounds, ginsenosides on polyethersulphone membrane, and its application to the quantitative immunoassay for ginseng saponins.

Morinaga O, Fukuda N, Tanaka H, Shoyama Y

Innovation Plaza Fukuoka, Japan Science and Technology Agency, 3-8-34 Momochihama, Fukuoka 814-0001, Japan.

A method has been devised for the chromatographic resolution of glucosidic compounds, ginseng saponins, on polyethersulphone (PES) membrane. The method results in good resolution and quantitative immunoassay for ginsenoside Rb1 (G-Rb1), G-Rc, and G-Rd in crude extracts of various ginsengs. The newly established method is simpler and applies for quantitative analysis. Ginsenosides developed by acetonitrile-water-acetic acid solvent system on a PES membrane were directly treated with a NaIO4 solution followed by bovine serum albumin (BSA), resulting in a ginsenoside-BSA conjugate on a PES membrane. Anti-G-Rb1 monoclonal antibody (MAb) was bound, and then a second antibody labeled with peroxidase directed against the first antibody. Finally a substrate reacted to the enzyme and gave staining. The stained membrane was scanned, and spots were analyzed quantitatively using NIH Image software. At least 62.5 ng of G-Rb1, G-Rc, and G-Rd were clearly detectable individually. Three ginsenosides can be analyzed quantitatively between 0.125 and 2.0 microg.

Published 21 September 2005 in Glycobiology, 15(10): 1061-6.
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