1. Impact of light irradiation on black tea quality during withering
- Author
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Dejiang Ni, Yuqiong Chen, Beibei Zhang, H.D. Chen, Zeyi Ai, and Yu Zhi
- Subjects
0301 basic medicine ,Astringent ,biology ,Chemistry ,Cyan ,food and beverages ,04 agricultural and veterinary sciences ,Orange (colour) ,biology.organism_classification ,040401 food science ,03 medical and health sciences ,030104 developmental biology ,0404 agricultural biotechnology ,Ultraviolet light ,Original Article ,Fermentation ,Food science ,Sugar ,Flavor ,Aroma ,Food Science - Abstract
Black tea manufacture usually involves the processes of withering, cutting, fermentation and drying. The aim of present study was to evaluate the effect of the relationship between the quality and withering with different light sources (ultraviolet, yellow, blue, purple, orange, red, cyan, green and white) an quality attribute of tea. The results indicated that the yellow, orange and red light withering significantly improved the aroma and taste, imparting the tea a sweet flavor and a fresh and mellow taste. Tea treated with yellow light was scored highest the sensory scores and showed the highest content in catechins, theaflavins, amino acids and aroma components, followed by the orange and red light treatments. The black tea withered with ultraviolet light showed a strong astringency, probably resulting from low contents of theaflavins, amino acids and soluble sugar. The green light irradiation remarkably damaged the aroma and taste of the tea, leading to a strong greenish flavor and an astringent taste, probably owing to the lowest contents of chemical compositions. No significant cumulative effect was found in the hybrid light withering treatments. Therefore, monochromatic yellow, orange and red lights were suggested for withering the black tea to improve its overall quality.
- Published
- 2017
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