Summary
A sample of the flower-petals ofThespasia populnea is found to contain populnin (0·33%), populnetin (0·07%) and herbacetin (mostly as its glucoside, 0·03%). The proportions vary with different samples depending on seasonal and other factors. Besides these three yellow pigments, a colourless phenolic compound called populneol is also present (0·16%).
Populnetin seems to be a new tetrahydroxy flavone and populnin is its monoglucoside.
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References
Neelakantam and SeshadriCurr. Sci., 1938,7, 16.
Rao and ReddiProc. Ind. Acad. Sci. (A), 1940,12, 372.
Rangaswami and SeshadriIbid., 1940,16, 129.
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Neelakantam, K., Rao, P.S. & Seshadri, T.R. Chemical components of indian tulip (Thespasia populnea) flowers. Proc. Indian Acad. Sci. (Math. Sci.) 17, 26–31 (1943). https://doi.org/10.1007/BF03048848
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DOI: https://doi.org/10.1007/BF03048848