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Studies on the constituents of swertia japonica: Isolation and structure of new flavonoids, swertisin and swertiajaponin.

✍ Scribed by M. Komatsu; T. Tomimori

Book ID
104250218
Publisher
Elsevier Science
Year
1966
Tongue
French
Weight
303 KB
Volume
7
Category
Article
ISSN
0040-4039

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✦ Synopsis

Swertisin was first isolated from the whole herb of Swertla japonica (Fam: Gentianaceae) by Nakaolti (l), who proposed the empirical formula Cl3HlGO G H20. Subsequently, Asahlna et al. revised the formula for swertisin to C23H24Oll(2). No further investigations, however, have been made. We now found that crude swertisin, obtained from this plant by Nakaoki's procedure, consisted of swertisln and a small amount of two other flavonoid compounds, which were isolated in pure state on polyamide chromatography i. e. compound (I), m. p. 243" (decomp. ) : compound (II), m. p. 265" (decomp. ) and compound (III), m. p. 237" (decomp. ). Compound (II) was a new flavonoid, which would be named swertiajaponin hereafter, and compound (III) was identical with home-orientin (m.p. and mined m.p. 237") I.R., and U.V. spectra identical with an authentic sample). The present paper deals with the elucidation of the structures of swertisin (I) and swertiajaponin (II), which have now been established as I and II respectively.

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