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J Agric Food Chem

Title:		"Antioxidant activities of extracts from teas prepared from medicinal plants, Morus alba L., Camellia sinensis L., and Cudrania tricuspidata , and their volatile components"
Author(s):		Nam S; Jang HW; Shibamoto T;
Address:		"Department of Food Science, Gyeongnam National University of Science & Technology , 33 Dongjinro, Jinju, Gyeongsangnamdo, 660-758, Republic of Korea"
Journal Title:		J Agric Food Chem
Year:		2012
Volume:		20120828
Issue:		36
Page Number:		9097 - 9105
DOI:		10.1021/jf301800x
ISSN/ISBN:		1520-5118 (Electronic) 0021-8561 (Linking)
Abstract:		"The antioxidant activity of essences of teas prepared from mulberry ( Morus alba L.), Camellia sinensis L., and Cudrania tricuspidata (Carr.) Burea plant was examined using two antioxidant assays. Selected volatile chemicals identified in these plants were also tested for antioxidant activity. All extracts exhibited antioxidant activity with a clear dose response in the aldehyde/carboxylic acid and the malonaldehyde/gas chromatography (MA/GC) assays. Antioxidant activity of extracts at the level of 500 mug/mL ranged from 77.02 +/- 0.51% (stems of Burea plant) to 52.57 +/- 0.92% (fermented tea of Camellia and stems of Mulberry tea) in the aldehydes/carboxylic acid assay. Their antioxidant activity at the level of 160 mug/mL ranged from 76.17 +/- 0.27% (roots of Burea plant) to 59.32 +/- 0.27% (stems of Mulberry tea) in the MA/GC assay. Among the positively identified compounds (11 terpenes and terpenoids, 15 alkyl compounds, 26 nitrogen containing heterocyclic compounds, 9 oxygen containing heterocyclic compounds, 18 aromatic compounds, 7 lactones, 6 acids, and 4 miscellaneous compounds), eugenol, 2,5-dihydroxyl acetophenone, and isoeugenol exhibited antioxidant activity comparable to that of BHT in both assays. Vanillin and 2-acetylpyrrole showed potent antioxidant activity in the aldehydes/carboxylic acid assay but only moderate activity in the MA/GC assay. These results suggest that consumption of antioxidant-rich beverages prepared from these plants may be beneficial to human health"
Keywords:		"Antioxidants/*analysis Beverages/*analysis Camellia sinensis/*chemistry Moraceae/*chemistry Morus/*chemistry Plant Extracts/*analysis Plant Leaves/chemistry Plants, Medicinal/*chemistry Volatile Organic Compounds/*analysis;"
Notes:		"MedlineNam, Sanghae Jang, Hae Won Shibamoto, Takayuki eng 2012/08/09 J Agric Food Chem. 2012 Sep 12; 60(36):9097-105. doi: 10.1021/jf301800x. Epub 2012 Aug 28"