Effects of Light Waves on the Aroma Substances of Fresh Tea Leaves in Summer and Autumn During Spreading and the Quality of Final Green Tea

LIU Jianjun; ZHANG Jinyu; PENG Ye; LIU Xiaobo; YANG Yun; HUANG Tao; WEN Beibei; LI Meifeng

doi:10.13305/j.cnki.jts.20220520.001

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Journal of Tea Science ›› 2022, Vol. 42 ›› Issue (4) : 500-514. DOI: 10.13305/j.cnki.jts.20220520.001

Effects of Light Waves on the Aroma Substances of Fresh Tea Leaves in Summer and Autumn During Spreading and the Quality of Final Green Tea

LIU Jianjun, ZHANG Jinyu, PENG Ye, LIU Xiaobo, YANG Yun, HUANG Tao, WEN Beibei^*, LI Meifeng^*

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Abstract

The rough aroma is an important factor affecting the quality of summer and autumn green tea. In order to improve the quality of summer and autumn green tea, this experiment took Fuding Dabai tea as the research object, and irradiated fresh leaves in vitro with red light, yellow light, blue light and purple light, and the nature light was used as the control. Headspace solid-phase microextraction-gas chromatography-mass spectrometry (HS-SPME-GC-MS) was used to qualitatively and quantitatively detect the volatile components of the fresh leaves. Supplemented by Hierarchical Cluster Analysis (HCA), Principal Component Analysis (PCA) and Partial least squares discriminant analysis (PLS-DA), the optimal light wave and key substances that promote the formation of tea's floral and fruity aroma were identified. The results show that different light qualities had significant effects on the types and contents of aroma substances. A total of 36 aroma substances were identified from 5 samples, of which alcohols and terpenes were the most numerous, and the average content of esters was the highest, followed by alcohols. Red light was the best light to promote the accumulation of tea aroma components. 3-Carene, β-Myrcene and phenylethyl alcohol were the key substances for improving the aroma in tea leaves. All light treatments could promote the free amino acids and caffeine in fresh leaves, and reduce the ratio of phenol to ammonia. After light treatment, the fresh and floral flavor of green tea was more obvious, and the taste was fresh. The comprehensive score of the tea samples treated with red light was the best. The research has shown that red light irradiation of fresh tea leaves in summer and autumn could increase the types and contents of tea aroma substances, significantly improve the key substances in the formation of flower and fruit aroma, and increase the freshness of tea soup.

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fresh tea leaves / light spreading / quality components / volatile components

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LIU Jianjun, ZHANG Jinyu, PENG Ye, LIU Xiaobo, YANG Yun, HUANG Tao, WEN Beibei, LI Meifeng. Effects of Light Waves on the Aroma Substances of Fresh Tea Leaves in Summer and Autumn During Spreading and the Quality of Final Green Tea[J]. Journal of Tea Science. 2022, 42(4): 500-514 https://doi.org/10.13305/j.cnki.jts.20220520.001

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