Welcome to Chinese Journal of Tropical Crops,

Chinese Journal of Tropical Crops ›› 2020, Vol. 41 ›› Issue (9): 1897-1904.DOI: 10.3969/j.issn.1000-2561.2020.09.025

• Post-harvest Treatment & Quality Safety • Previous Articles     Next Articles

Comparison of Biochemical Components and Antioxidant Activities among Sun-dried Green Tea Produced by Fresh Leaves of Bush and Arbor Tree

JIAO Wenwen1,NIAN Bo1,CHEN Lijiao1,LIU Qianting1,JIANG Bin1,ZHANG Zhengyan1,LIU Mingli1,Ma Yan1,ZHAO Ming1,2,*()   

  1. 1. College of Longrun Pu-erh Tea, Yunnan Agricultural University, Kunming, Yunnan 650201, China
    2. National & Local Joint Engineering Research Center on Gemplasm Innovation & Utilization of Chinese Medicinal Materials in Southwest China, Yunnan Agricultural University, Kunming, Yunnan 650201, China
  • Received:2019-09-09 Revised:2019-12-04 Online:2020-09-25 Published:2020-10-16
  • Contact: ZHAO Ming

Abstract:

Bush, transforming and transformed arbor tea trees would be formed during the transformation of tea plantation from bush to arbor trees. In this study, the biochemical components and antioxidant activities of sun-dried green tea processed by the above three kinds of tea plants were compared. The contents of various components were determined by spectrophotometry and high performance liquid chromatography methods. The content of theanine, glutamic acid and other 15 amino acids in arbor tea were higher than those in bush tea, exception threonine, arginine and gamma-aminobutyric acid (P<0.05), while the content of tea polyphenols, gallic acid, 1,4,6-O-gallic acyl-beta- D-glucose and epigallocatechin gallate (EGCG) in arbor tea were significantly lower than those in bush tea (P<0.05). Sensory evaluation showed that the taste of bush tea was bitterer than that of arbor tea. Arbor and bush tea grouped into different clusters in orthogonal partial least squares analysis of the content of the compounds, which confirmed the difference of the biochemical components between these two teas. The activities of spring arbor tea including the total antioxidant capacity, DPPH free radical and superoxide anion scavenging capacity were higher than those of bush tea (P<0.05), while hydroxyl radical scavenging abilities between these two types of teas were not different. In autumn tea, the total antioxidant capacity of arbor tea was higher than that of bush tea (P<0.05), while the scavenging capacity of superoxide anion were lower than bush tea (P<0.05), while the scavenging capacities of hydroxyl free radical and DPPH were not different (P>0.05). In summary, comparison to bush sun-dried green tea, the content of amino acid in arbor tea was increased, and the level of polyphenol and bitterness were reduced. Partial antioxidant activities were also increased. Thus, the transformation of tea plantation from bush to arbor tree can improve the quality of sun-dried green tea.

Key words: arbor tea, bush tea, biochemical composition, antioxidant activity

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