+ Main Category
Research: 36,903,181
+ Most Shared Content's Most Shared Content

+ Follow Us

EurekaMag.comon Google+

+ Latest Full Text Content PDF full text articles

Chemical study of bark from Commiphora angolensis Engl

, : Chemical study of bark from Commiphora angolensis Engl. Bol Escola Farm Univ Coimbra Edicao Cient: 3-128

Two types of principles were identified: tannins and anthocyanin pigments. Condensed tannins were revealed by the usual color and precipitation reactions and by quantitative determination by the methods of Lowenthol-Procter and of Deijs. The results obtained for the powder of the bark were 32.76% and 33.28% and for the alcoholic extract, 75.25% and 76.36%. The anthocyanin pigments were detected by their color reactions and by their partition between solvents. Petunidin-3-rhamnoglucoside was identified in a fraction purified by chromatogra-phy in thick paper and by elution by hydrochloric methanol, using ascending paper chromatography with the following mixture of solvents: butanol-acetic acid-water; butanol-hydrochloric acid; 1% hydrochloric acid. The presence of this pigment was confirmed through the identifi-cation of its products of hydrolysis. The petunidin was identified by some characteristic reactions and by ascending chromatography with the following mixtures of solvents: butanol-acetic acid-water; acetic acid-hydrochloric acid-water; formic acid-hydrochloric acid-water. Rhamnose in a fraction purified by solution in pyridine, using ascending paper chromatography was also identified.

Accession: 024318594 PDF Full Text: Upload

Submit PDF Full Text of Accession 024318594

No spam - Every submission is manually reviewed

Select a file (≤5MB):

Close Close

Related Research

Ultra-violet microscopy and its application for the study of the chemical composition of tissue

Ultrastructural and chemical study of modern and fossil sporoderms by Scanning Transmission X-ray Microscopy (STXM)

Utilisation of front face fluorescence spectroscopy as a tool for the prediction of some chemical parameters and the melting point of semi-hard and hard cheeses: a preliminary study

When emulsions meet saliva: a physical-chemical, biochemical and sensory study

A biological and chemical study of several anaerobic digesters: Biological and chemical analyses were carried out on several digesters operated on laboratory, pilot and full-scAlc. These digesters received a var...

A biological-chemical study of soil organic-matter fractionation

A chemical and physiological study of traumatin, a plant wound hormone: The authors have worked out a quantitative biol. assay for wound hormone activity, the method being based upon the size of intumescence formed by d...

A chemical approach to the study of arthritis

A chemical study of Bocconia latisepala Wats: The Bacconia latisepala Wats., has been chemically studied. Each part was extracted separately with petroleum ether and with ethanol. The extracts...

A chemical study of a soil under long-continued field experiment: Over a 27-yr. period the application of superphosphate, rock phosphate, and slag phosphate to a Cisne silt loam created a large residual supply of...

A chemical study of ensiling soybeans: Normal changes in composition, and losses of nutrients due to the ensiling of soybeans (Soja max), based on weights and analyses of 15 sample bags...

A chemical study of mixtures of lime sulfur and lead arsenate: Laboratory studies of the chemical composition of lime sulfur spray solutions and those to which lead arsenate, lime and dried skim milk had been a...

A chemical study of the Molinillo plant , with special reference to its seed: A chemical study was made on the molinillo, an annual shrub-like plant of the mint family, because it had a reputation as an antimalarial in the lo...

A chemical study of the flavonoid of the five-lobed motherwort: Three flavonoid substances were isolated from the plant. One of them was characterized as rutin on the basis of physicochemical studies. Paper chro...

A chemical study of the fruits of northern Indochina: Generally the introduced orange vars. are superior to local types. The only exceptions are the native vars. Bo-Ha and Xa-Doai which are comparable....