Presence of gallic acid, ellagic acid, corilagin and related ellagitannins, 3,6hexahydroxydiphenoyl-glucose and its isomer, 4,6-hexahydroxydiphenoyl glzrcose, 1-galloyl glucose, 3-galloyl glucose and qtlercetin is reported in the alcoholic extraxt of Jambul seeds. Acetone extract of the bark and seeds contain partially methylated derivatives of ellagic acid i.e. 3,3'-di-0-methyl ellagic acid and 3,3', 4-tri-0-methyl ellagic acid. Alcoholic extraction of tannins results into their extensive degradation into simple phenolic compounds. Jambul (Syzygium cumini SKEELS, Myrtaceae) seeds are known for their medicinal characters to cure diabetes, diarrhoea, dysentry and blood pressure [I]. JAGODZINSKI et al. [2] isolated a principle from Jambul seeds which abolished the glycosurea, hyperglycemia and reduced the polydepsia which occurred in diabetic rats. LAL and CHAUDHURI [3] have reported that the Ja~nbul seeds extracts are capable of lowering blood pressure to the extent of 34.6%. Recent studies with ellagic acid (a phenolic acid) by BHARGAVA et al. [4] have shown that it markedly lowers the blood pressure. In order to ascertain which particular phenolic compounds in Jambul seeds are responsible for their medicinal character, a series of investigations has been started. In the present paper, a detailed account of the polyphenols, present in the seeds, and bark is being reported. Experimental Melting points are uncorrected, U.V. spectra are recorded in ethanol by Hilger and Watts Spectrophotometer and log E values are given in parenthesis. I.R. spectra are recorded in nujol by Perkin-Elmer infracord; only main peaks are cited. Alcoholic extraction The dried seeds (100 g) were extracted with 70% ethanol (500 ml), the extract was concentrated
A method is described for the estimation of individual polyphenols of tea leaf. Polyphenols separated by two‐way paper chromatography of a methanolic extract of the material were located under ultra‐violet light. The excised spots were eluted with water and estimated from extinctions at 275 nm. Three of the polyphenols, (−)‐epigallocatechin gallate, (−)‐epigallocatechin and (−)‐epicatechin gallate, which comprise 10‐19% of the dry matter of tea shoots from Assam, are partly consumed during the manufacture of black tea. Seasonal variation in the polyphenolic content of some jats and clones grown in North East India are described. The phenolic content of the tea shoots was higher during rains. Changes in the phenolic pattern during the growth and development of tea flower, fruit and seed are described. Organs of tea, such as sepals, petals and pericarp with closer morphological affinities to the leaf, showed a greater degree of similarity in their phenolic pattern compared with other organs such as stigma, style, carpel, anther and testa. The gallates were mostly confined to the chlorophyll‐bearing organs.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.