Total polyphenol content and antioxidant capacity of commercially available tea (Camellia sinensis) in Argentina

被引:285
作者
Anesini, Claudia [1 ]
Ferraro, Graciela E. [1 ]
Filip, Rosana [1 ]
机构
[1] Univ Buenos Aires, Fac Pharm & Biochem, IQUIMEFA UBA CONICET, Chair Pharmacognosy Plant Physiol, RA-1113 Buenos Aires, DF, Argentina
关键词
Camellia sinensis; tea; polyphenols; antioxidant; FTC; DPPH; Argentina;
D O I
10.1021/jf8022782
中图分类号
S [农业科学];
学科分类号
09 ;
摘要
Tea, Camellia sinensis (L.) O. Kuntze (Theaceae) is cultivated in Argentina in the northeastern region (provinces of Misiones and Corrientes), between 26 degrees and 28 degrees south latitude, the southernmost area of the world where tea is cultivated. The objective of this work was to determine the total polyphenol content and the in vitro antioxidant capacity of green and black tea cultivated and industrialized in Argentina. Twelve samples of eight brands were analyzed. The total polyphenol content was determined according to the International Organization for Standardization method (ISO) 14502-1 for the determination of substances characteristic of green and black tea. The antioxidant capacity was determined by the ferric thiocyanate method (FTC) and the 1,1-diphenyl-2-picrylhydrazyl (DPPH) free-radical scavenging assay. Green tea showed a higher polyphenol content than black tea. The total polyphenol concentration in green tea was found to vary from 21.02 +/- 1.54 to 14.32 +/- 0.45% of gallic acid equivalents (GAE), whereas in black tea, the polyphenol content ranged from 17.62 +/- 0.42 to 8.42 +/- 0,55% of GAE (P < 0.05). A similar profile was observed for the antioxidant capacity determined by both methods. The antioxidant activities were well correlated with the total polyphenol content (r(2) = 0.9935 for the ferric thiocyanate method and r(2) = 0.9141 for the 1,1-diphenyl-2-picrylhydrazyl free-radical scavenging assay). This is the first systematic screening for the quantification of polyphenols and antioxidant activity in tea commercialized in Argentine markets. The results obtained herein allow one to conclude that Argentine tea is of very good quality when compared to teas from other sources.
引用
收藏
页码:9225 / 9229
页数:5
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