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Chinese Agricultural Science Bulletin ›› 2024, Vol. 40 ›› Issue (31): 139-145.doi: 10.11924/j.issn.1000-6850.casb2023-0799

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Analysis of Sensory Quality and Biochemical Components of Jingshan Black Tea

LU Jian1(), DONG Junjie2(), LIU Yu3, LIAO Weiliang4, SHU Zaifa5, TONG Yan6, CHEN Hongbing7, ZHANG Fengdi8()   

  1. 1 Agricultural Technology Promotion Center of Yuhang District, Hangzhou 311121
    2 Zhejiang Camel Transworld Organic Food Co., Ltd., Hangzhou 311100
    3 Ningbo Agricultural and Rural Big Data Development Center, Ningbo, Zhejiang 315000
    4 Jingshan Tea Industry Association of Yuhang District, Hangzhou 311100
    5 Lishui Academy of Agricultural and Forestry Sciences, Lishui, Zhejiang 323000
    6 Hangzhou Yuhang Chekengwu Tea Factory, Hangzhou 311116
    7 Yunding Farm, Huanghu Town of Yuhang District, Hangzhou 311100
    8 Agriculture and Rural Bureau of Yuhang District, Hangzhou 311121
  • Received:2023-11-21 Revised:2024-08-08 Online:2024-11-05 Published:2024-11-04

Abstract:

In order to provide a theoretical foundation for the production of high-quality Jingshan black tea, this study clarified the quality characteristics of Jingshan black tea and selected suitable cultivars for its production. Tea leaves of 9 representative cultivars were used to make tea, including ‘Zuijinhong’, ‘Huaxiangchun’, ‘Yujinxiang’, ‘Jiukeng Population’, ‘Maolv’, ‘Zhenong 113’, ‘Baiye No.1’, ‘Zijuan’ and ‘Jiaming No.1’. By sensory quality evaluation and chemical analysis, the quality characteristics and the main biochemical components of Jingshan black tea of different cultivars were obtained. The results showed that the appearance of Jingshan black tea was wiry and tight (heavy), slightly tippy, black bloom, the liquor color was bright and red, the aroma was pure and flowery, the taste was mellow and refreshing, the infused leaves were red even bright. It was found that the quality of black tea made by ‘Huaxiangchun’ and ‘Maolv’ was the best. There were significant differences in the biochemical components contents of the 9 kinds of Jingshan black tea, where the catechins, theaflavins, thearubigins, theabrownins, water extract, tea polyphenols, caffeine and Tp/Aa (the ratio of tea polyphenols to amino acids) ranged from 3.71%-6.63%, 0.07%-0.84%, 1.82%-8.20%, 0.65%-7.39%, 44.23%-49.06%, 8.73%-13.55%, 2.46%-3.92% and 5.06-10.97, respectively. Based on bivariate correlation analysis, it was indicated that the total sensory evaluation score of Jingshan black tea was significantly (P<0.05) or extremely significantly (P<0.01) positively correlated with the content of EGC, ECG, total catechins, amino acids and tea polyphenols. Also, it was significantly (P<0.05) negatively correlated with theaflavins content and Tp/Aa. In comparison, the cultivars of ‘Jiukeng Population’, ‘Maolv’, ‘Baiye No.1’, ‘Jiaming No.1’, ‘Huaxiangchun’, ‘Yujinxiang’ and ‘Zuijinhong’ are more suitable for making Jingshan black tea than ‘Zhenong 113’ and ‘Zijuan’.

Key words: tea cultivars, Jingshan black tea, sensory quality, biochemical components, correlation analysis, variety screening