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Antioxidant Capacity and Phenolic Contents of Three Quercus Species
Ist Teil von
International Letters of Natural Sciences, 2016-05, Vol.54, p.85-99
Erscheinungsjahr
2016
Quelle
EZB Electronic Journals Library
Beschreibungen/Notizen
The antioxidant capability and phenolic contents of ethanol extracts (free phenolics) and ethyl acetate extracts (bound phenolics) of three
Quercus
species were estimated in this work. The antioxidant activities were examined by 1,1-diphenyl-2-picrylhydrazyl (DPPH), 2,2′-azinobis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS) free radical, reducing power and
b
-carotene bleaching methods. HPLC was employed to detect major phenolic acids. The leaf extract of
Q. salicina
contained maximum total phenolics while the highest total flavonoid content was found in the leaf extract of
Q. serrata
. The antioxidant activities varied among three species. Bark extract of
Q. salicina
was the most potential and it was closed to levels of the standard antioxidative dibutyl hydroxytoluene (BHT). The bark extract of
Q. serrata
also showed promising antioxidant activities despite their eminence was negligibly lower than
Q. salicina
. Stronger antioxidant activities of free phenolics than those of the bound phenolics may be attributed to higher quantities of free phenolics in the barks of
Quercus
species, however total flavonoids may not contribute a critical role. By HPLC analysis, thirteen phenolic acids were detected in the leaf and bark extracts. Of them,
Q. salicina
showed maximum in number (ten compounds) and quantities of detected phenolic acids. Ellagic, chlorogenic and benzoic acids were dominant in
Quercus
species. Findings of this study revealed that leaves and barks of three
Quercus
species are rich source of antioxidants, and
Q.
salicina
is the most promising and should be elaborated to exploit its pharmaceutical properties.
Sprache
Englisch
Identifikatoren
ISSN: 2300-9675
eISSN: 2300-9675
DOI: 10.56431/p-u66fhw
Titel-ID: cdi_crossref_primary_10_56431_p_u66fhw
Format
–
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