Chemical Composition Analysis of Unique &#x02018;Rattan Tea&#x02019; in Yunnan

FANG Chenggang; YANG Gaozhong; YANG Yingbiao; ZHANG Liqiu; CHEN Xia; LI Lianchao; L&#x000dc; Haipeng; LIN Zhi

doi:10.13305/j.cnki.jts.2024.02.009

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Journal of Tea Science ›› 2024, Vol. 44 ›› Issue (2) : 299-315. DOI: 10.13305/j.cnki.jts.2024.02.009

Research Paper

Chemical Composition Analysis of Unique ‘Rattan Tea’ in Yunnan

FANG Chenggang¹, YANG Gaozhong^2,3, YANG Yingbiao⁴, ZHANG Liqiu⁵, CHEN Xia¹, LI Lianchao⁶, LÜ Haipeng^2,*, LIN Zhi^2,*

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Abstract

‘Rattan tea’ is a unique tea in Yunnan, named after the distinctive cultivation method developed by local tea farmers over generations which prompts tea tree trunks to resemble rattan in appearance. To investigate the impact of the ‘rattan tea’ pluck management system on tea quality, the one bud and two leaves from rattan tea plantation were collected to produce sun-dried tea, black tea and white tea, and the samples of the same kind of fresh leaves of the modern tea plantation were used as the control. These samples were used for the sensory evaluation and chemical composition analysis. The study shows that the sun-dried tea made from fresh rattan tea leaves exhibits a higher refreshing aroma and stronger taste, while the white tea has a stronger aroma and sweeter taste. In contrast, the black tea from modern tea gardens is characterized by a higher level of sweet aroma and a refreshing taste. The total catechin content in rattan tea was significantly lower than that in modern tea plantations, particularly in rattan white tea (67.11 mg·g^-1), which was significantly lower than that of modern tea plantation white tea (84.19 mg·g^-1). The content of theanine in rattan sun-dried tea (16.79 mg·g^-1) was significantly higher than that in modern tea plantation sun-dried tea (14.69 mg·g^-1). Both rattan sun-dried tea and rattan white tea exhibited lower phenol-to-amino acid ratios. A total of 205 primary metabolites were identified, with rattan white tea accumulated a richer profile of sugars. In addition, a total of 127 volatile compounds were detected in all tea samples. Alcohols and esters were the predominant volatile components in different tea types, with rattan white tea exhibiting significantly higher total volatile compound content than modern tea plantation white tea. Rattan black tea contained a higher content of geraniol, while modern tea plantation black tea had higher levels of linalool. In summary, the processing methods of sun-dried tea and white tea were found to be more conducive to obtain high-quality rattan tea products, and the overall chemical quality of tea samples made from rattan tea plantation were better than that of tea samples from modern tea plantation.

Key words

chemical composition / rattan tea / sensory evaluation / volatile components

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FANG Chenggang, YANG Gaozhong, YANG Yingbiao, ZHANG Liqiu, CHEN Xia, LI Lianchao, LÜ Haipeng, LIN Zhi. Chemical Composition Analysis of Unique ‘Rattan Tea’ in Yunnan[J]. Journal of Tea Science. 2024, 44(2): 299-315 https://doi.org/10.13305/j.cnki.jts.2024.02.009

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