• K S Pankajamani

      Articles written in Proceedings – Section A

    • Survey of anthoxanthins—Part I

      K S Pankajamani T R Seshadri

      More Details Abstract Fulltext PDF

      Circular Rf values of important synthetic flavonols have been determined using phenol saturated with water. The results have been used for analysing the flavonol composition of plant extracts, three typical examples being taken;Moringa pterygosperma flowers, Neem flowers and Indian Podophyllum (Podophyllum emodi) resin. The results have been verified by applying regular methods of fractionation involving lead salt precipitation, fractional crystallisation of the acetates and adsorption chromatography of the methyl ethers. These materials could therefore be used as standards of comparison where synthetic flavonols are not readily available. Some information about the nature of the glycosides have been provided by colour reactions.

    • Survey of anthoxanthins—Part II

      K S Pankajamani T R Seshadri

      More Details Abstract Fulltext PDF

      Fresh flowers are found to be much more satisfactory for getting a true picture of the flavonoid composition than dried ones. The following fresh flowers have now been examined. (1)T. neriifolia.—The flowers contain a mixture of quercetin (5 parts) and kæmpferol (1 part) present mainly as their glycosides. (2)Cambodia cotton flowers.—These contain almost entirely quercetin most of which is present as quercimeritrin and a very small amount is possibly as isoquercitrin. (3)T. erecta.—This contains only quercetagetin in the form of its glycoside. (4)H. vitifolius.—These contain mainly gossypetin as the 8-glucoside, gossypin, along with free quercetin in minor quantities. (5)H. esculentus.—This is similar toH. vitifolius except for the presence of large amount of impurities and seems to contain more of quercetin in the form of glycoside. (6)Yellow roses: (a) Marechel Neil and (b) Lady Hellingden (T.) are good sources of kæmpferol and contain quercetin as a very minor component. These are present as their glycosides.

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