Antioxidant activity of Indian propolis and its chemical constituents

Autor:	Nayan Roy, Naznin Ara Begum, Rajibul A. Laskar, Ismail Sk
Rok vydání:	2010
Předmět:	chemistry.chemical_classification Pinocembrin Antioxidant DPPH medicine.medical_treatment Radical Flavonoid General Medicine Propolis Analytical Chemistry Galangin chemistry.chemical_compound chemistry Polyphenol medicine Organic chemistry Food science Food Science
Zdroj:	Food Chemistry. 122:233-237
ISSN:	0308-8146
DOI:	10.1016/j.foodchem.2010.02.068
Popis:	We report for the first time the antioxidant activity of the aqueous and ethanol extracts of Indian propolis (AEP and EEP, respectively). The antioxidant activity was measured by chemical and electrochemical assays. Reducing power and 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity were the chemical assays, whereas, cyclic voltammetry was used as the electrochemical assay. In all these assays, AEP showed significantly greater activity over EEP; which is in contradiction with the previous reports of propolis from other countries. This may be due to its higher polyphenol content. Hence aqueous extract may well be a substitute of organic solvent extracts of propolis. Moreover, two flavonoids, pinocembrin (1) and galangin (2) were isolated from EEP; among which (2) showed high DPPH radical scavenging activity. Thus Indian propolis, being a rich source of natural antioxidants, may be used in the prevention of various free radicals related diseases.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4bdef6e874d8ffb6425672958e36c424 https://doi.org/10.1016/j.foodchem.2010.02.068 Zobrazit plný text záznamu Full Text from ScienceDirect