Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2022, Vol. 38 ›› Issue (19): 159-164.doi: 10.11924/j.issn.1000-6850.casb2022-0065

Special Issue: 生物技术 园艺

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Effects of Temperature-changing Withering Technology on the Quality of Gongmei White Tea

HUANG Fan(), WANG Yingchun(), YE Yulong, GONG Xuejiao, HUANG Yingbo, XIONG Yuanyuan   

  1. Tea Research Institute, Sichuan Academy of Agricultural Sciences, Chengdu 610011
  • Received:2022-02-11 Revised:2022-02-17 Online:2022-07-05 Published:2022-07-13
  • Contact: WANG Yingchun E-mail:474844276@qq.com;273996890@qq.com

Abstract:

In order to explore the effects of temperature-changing withering on the sensory quality of white tea, Gongmei white tea of different seasons were taken as the research object. Compared with the traditional withering process, short-term hot air (45℃) of 10, 30 and 50 s were added to the withering process. The results showed that: compared with traditional withering process, the temperature-changing withering of 30 s enabled the sensory quality of Gongmei white tea to have grassy aroma reducing, honey aroma, orange-red tea soup and sweet taste, showing the characteristics of aged white tea;but after the temperature-changing withering of 10 s, there was still grassy aroma and astringent taste of fresh white tea; and the temperature-changing withering of 50 s had obvious effects on white tea, showing red color of dry tea, infused leaf and soup, and the sweetness of the taste and aroma had the characteristics of black tea. The three kinds of temperature-changing withering treatments could all reduce the content of water extracts, amino acids, soluble sugars, tea polyphenols, EGCG, ECG, non-ester catechins, ester catechins, total catechins and other substances in Gongmei white tea, and increase the content of flavonoids, thearubigin, theaflavin, and theabrownin. In terms of the Gongmei white tea of different seasons, after 30 s temperature-changing withering, the content decrease of caffeine, tea polyphenols, EGCG, ECG, CG, ester catechins and total catechins of Gongmei white tea in summer were greater than those in spring and autumn; while the flavonoids, GC and EC contents of non-ester catechins of Gongmei white tea in summer had the largest increase and the highest sensory quality score. To sum up, temperature-changing withering at different time has a significant impact on the quality of white tea of different seasons. The temperature-changing withering treatment at 45°C of 30 s can be used as a technological means to accelerate the aging of white tea and improve the utilization value of summer tea.

Key words: Gongmei white teas, temperature-changing withering, sensory quality, biochemical components

CLC Number: