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J.Health Sci.,45(5), 293-296,1999
Rapid Analysis of Sennoside A and B in Health Teas by Capillary Electrophoresis [in Japanese]
Akiko Sugiyama, Masanori Nakashima, and Seiji Nishida
The Fukuoka City Institute of Public Health and Environment, 34 -1 Jigyouhama 2-chome, Chuou-ku, Fukuoka 810 -0065, Japan
A method for determinations of sennoside A (SA) and sennoside B (SB) included in “health tea" by capillary electrophoresis (CE) was developed. A 0.02 M sodium borate solution adjusted to pH 10.8 was used for the running buffer. SA and SB were detected at UV 260 nm. C.V. (%) of migration times for SA and SB were 0.07 and 0.06%, and that of the peak area was 1.3%. The detection limits of SA and SB were 2 ppm. As CE has high theoretical plates, the refinement of sample was simplified and the time for analyzing extracts was shortened to about 1/3 of that by HPLC. Six samples of “health tea," advertised with a likely effect of losing weight, were examined and SA and SB were detected from three of the samples. The total concentrations of SA and SB were 0.11 -0.28%.
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