Three chromatographically individual fractions, each containing tigogenin glycosides and diosgenin glycosides have been isolated by chromatography on a silica gel column from a methanolic extract of eggplant seeds. To separate the mixture of two difficultly separable glycosides into individual components, each fraction was acetylated and epoxidated, and the derivatives obtained were separated chromatographically. The tigogenin glycoside peracetates isolated were saponified, and the diosgenin epoxide glycoside acetates were de-epoxidated and saponified, to give the individual glycosides, melongosides A, B, E, F, and H. The complete chemical structure of each melongoside has been shown with the aid of acid hydrolysis, methylation, and periodate oxidation followed by a study of the products obtained.
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Kintya, P.K., Shvets, S.A. Steroid glycosides of the seeds ofSolanum melongena. Structures of melongosides A, B, E, F, and H. Chem Nat Compd 20, 575–578 (1984). https://doi.org/10.1007/BF00580069
- Acid Hydrolysis
- Methanolic Extract