A Triterpene and A Phytosterol from Rhynchosia Minima



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Submitted Sep 19, 2020
Published Sep 29, 2020
10.24018/ejbio.2020.1.5.90

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The Chemical examination of the n-hexane extract of Rhynchosia minima results the separation of two compounds. To separate these compounds, the dried powder of Rhynchosia minima was succumbed to hot extraction with n-hexane and submitted to chromatography.

Mass spectra for the separated compounds appeared their molecular formula which was C30H50O for compound 1 and C29H48O for compound 2. In the 1H-NMR range of compound 1, H-3 proton revealed as a triplet of a double doublet (tdd) at δ 3.13, H-29 protons give two multiplets at δ 4.50 and δ 4.62 and seven methyl protons showed up at δ 27.46, 15.34, 16.09, 15.99, 14.55, 18 and 19.31. In the 1H-NMR range of compound 2, H-3 proton revealed as a triplet of a double doublet (tdd) at δ 3.45, olefinic proton H-6 revealed as a multiplet at δ 5.28 and six methyl protons showed up at δ 12.18, 19.3, 18.97, 21.02, 21.09 and 12.04. From the physical, chemical and spectral characteristics, compound 1 and 2 were distinguished as Lupeol and Stigmasterol.

Keywords: Rhynchosia minima, triterpene, sterol, Structure elucidation

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