4.4 Article

Structure elucidation of sweet-tasting cycloartane-type saponins from ginseng oolong tea and Abrus precatorius L. leaves

Journal

NATURAL PRODUCT RESEARCH
Volume 32, Issue 20, Pages 2490-2493

Publisher

TAYLOR & FRANCIS LTD
DOI: 10.1080/14786419.2017.1416383

Keywords

Saponins; HPLC-MS/MS; NMR; ginseng oolong; Abrus precatorius

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The composition of ginseng oolong a widely used tea product was investigated. A new sweet-tasting cycloartane-type saponin 3 beta-O-[beta-D-glucuronopyranosyl(1 -> 2)]-beta-D-6-acetylglucopyranosyl)-(20S, 22S)3 beta, 22-dihydroxy-9,19-cyclolanost-24-en-26,29-oic acid (9), along with five new compounds, was identified in the methanolic extract of the ginseng oolong tea. Structural elucidation was conducted by spectroscopic methods, including 1D- and 2D-NMR, HR-MS, HPLC-LITMS/ MS. It was shown that these compounds have different sugar chains connected to the abrusogenin molecule. Then saponin profiles of four commercially available ginseng oolong samples and Abrus precatorius L. leaves were compared and the presence of three known abrusosides and six new acetyl and malonyl abrusogenin derivatives was proved. The original ginsenosides were not detected in the extract, therefore, abrusosides could serve as a replacement responsible for the sweet taste of the tea. [GRAPHICS] .

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