Blood pressure effects and chemistry of black and white tea from Vietnam [P215]

Noon, Lucy, Davies, Ceri L. ORCID: https://orcid.org/0000-0003-3484-2866 and Bystrom, Laura M. (2019) Blood pressure effects and chemistry of black and white tea from Vietnam [P215]. In: The American Society of Pharmacognosy Annual Meeting 2019, 13-17 July 2019, Madison, Wisconsin.

Text (Published version) P-214 - Noon et al ASP2019-Electronic-Program-and-Abstract-Book-Final.pdf - Published Version Restricted to Repository staff only Download (8MB)

Abstract

Tea (Camellia sinensis) is one of the most widely consumed beverages in the world. Increasing evidence suggests that drinking tea can protect against cardiovascular disease. Such health effects have been attributed to the theanine, caffeine and polyphenol content of tea, all of which can affect blood pressure. This study aimed to evaluate the blood pressure effects, as well as the theanine, caffeine, and total phenolic content of black and white tea obtained from a traditional community in Vietnam. Theanine and caffeine content were measured using high-performance liquid chromatography (HPLC), and total phenolics were assessed by the Folin-Ciocalteu assay. Twenty four healthy subjects were provided with one cup of black or white tea for fourteen days. Blood pressure measurements were taken before the intervention and on day 14. Black tea was found to contain significantly higher theanine and caffeine concentrations than white tea (p=0.001). Black tea also showed a trend towards higher total phenolic content. Neither tea had significant effects on blood pressure. However, a small non-significant reduction in systolic and diastolic blood pressure was found in both experimental groups.

Item Type:	Conference or Workshop Item (Poster)
Additional Information:	Full text is abstract of poster presentation.
Subjects:	Q Science > QH Natural history > QH301 Biology R Medicine > RV Botanic, Thomsonian, and eclectic medicine
Divisions:	Schools and Research Institutes > School of Arts, Culture and Environment
Depositing User:	Ceri Davies
Date Deposited:	06 Jan 2026 13:22
Last Modified:	06 Jan 2026 13:30
URI:	https://eprints.glos.ac.uk/id/eprint/15716

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