Antioxidant capacity and phenolic contents of three Quercus species

• Autorzy: Thi Tuyen P. , Tan Khang D. , Thu Ha P.T. , Ngoc Hai T. , Elzaawely A.A. , Dang Xuan T.
• Języki publikacji: EN

Abstrakty

EN

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 β-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.

Słowa kluczowe

EN

Quercus; Quercus crispula; Quercus salicina; Quercus serrata; antioxidant activity; phenolic compound; total phenolics content; antioxidant; antioxidant capacity; antioxidant potential

• Wydawca: -
• Czasopismo: International Letters of Natural Sciences
• Rocznik: 2016
• Tom: 54
• Opis fizyczny: p.85-99,fig.,ref.

Twórcy

autor

Thi Tuyen P.

• Graduate School for International Development and Cooperation, Hiroshima University, 739-8529, Hiroshima, Japan
• Forest Plant Department, Faculty of Forest Resources and Environmental Management, Vietnam National Forestry University, Xuan Mai, Chuong My, Hanoi, Vietnam

autor

Tan Khang D.

• Graduate School for International Development and Cooperation, Hiroshima University, 739-8529, Hiroshima, Japan

autor

Thu Ha P.T.

autor

Ngoc Hai T.

• Forest Plant Department, Faculty of Forest Resources and Environmental Management, Vietnam National Forestry University, Xuan Mai, Chuong My, Hanoi, Vietnam

autor

Elzaawely A.A.

• Department of Botany, Faculty of Agriculture, Tanta University, Tanta 31527, Egypt

autor

Dang Xuan T.

• Graduate School for International Development and Cooperation, Hiroshima University, 739-8529, Hiroshima, Japan

Bibliografia

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Identyfikatory

DOI

10.18052/www.scipress.com/ILNS.54.85