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Journal of Agriculture ›› 2023, Vol. 13 ›› Issue (12): 53-59.doi: 10.11923/j.issn.2095-4050.cjas2023-0029

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Quality Analysis and Optimization of Key Processing Technology to Reduce Bitterness of Flat Green Tea

HUANG Fan1(), ZHANG Xiang1, WANG Yingchun1, LUO Fan1(), XU Yaqiong1, WANG Gaoxi2   

  1. 1 Tea Research Institute, Sichuan Academy of Agricultural Sciences, Chengdu 610011, Sichuan, China
    2 Sichuan Impression Chuanzhiwei Tea Limited Liability Company, Guangyuan 628105, Sichuan, China
  • Received:2023-02-21 Revised:2023-05-24 Online:2023-12-20 Published:2023-12-19

Abstract:

In order to optimize the process of pan-fire and second-drying of single-bud flat green tea and reduce its bitterness of taste, a single factor test was carried out with the taste score of sensory quality, bitter taste of tea soup and dry tea color as evaluation indexes. On this basis, orthogonal experiments were carried out with the taste score of sensory evaluation, phenol-ammonia ratio, soluble sugar content, catechin total and catechin astringency index as evaluation indexes. The results showed that the optimum pan-fire conditions were the water content of 74%, pan-fire temperature of 320℃, pan-fire time of 8 min; and the optimum second-drying conditions were the water content of 15%, second-drying temperature of 80℃, second-drying time of 40 min. Compared with single-bud flat green tea processed by traditional technology, the taste score of sensory evaluation of single-bud flat green tea processed by optimized technology increased by 4 points, the phenol-ammonia ratio decreased by 0.222, the soluble sugar content increased by 1.376%, the total catechin increased by 5.7%, and the bitterness index decreased by 1.12. The result provides theoretical support for the formulation of standard technology of flat green tea.

Key words: flat green tea, bitterness, pan-fire, second-drying, orthogonal test