Summary
This study examined per- and polyfluoroalkyl substance (PFAS) contamination in fresh tea leaves from Hangzhou, China, identifying trifluoroacetic acid as the dominant contaminant and revealing significant seasonal and spatial variation. Through mediation analysis, the authors established that PFAS contamination reduces tea functional quality primarily by diminishing key catechins (epicatechin and epigallocatechin gallate), thereby compromising antioxidant activity. Whilst direct dietary exposure risks were deemed low, the findings demonstrate that PFAS burden substantially undermines the nutritional and functional value of tea.
UK applicability
The findings have potential relevance to UK tea imports and domestic tea cultivation, as PFAS contamination in agricultural soils is a recognised environmental concern in temperate regions. UK tea producers and importers may need to monitor for PFAS presence and consider mitigation strategies, particularly if sourcing tea from contaminated areas or utilising affected water supplies.
Key measures
PFAS concentrations (41 compounds including trifluoroacetic acid); catechin levels (epicatechin, epigallocatechin gallate); antioxidant activity; spatial distribution (hillslope vs. other locations); seasonal variation (spring vs. autumn)
Outcomes reported
The study measured concentrations of 41 per- and polyfluoroalkyl substances (PFAS) in 54 tea samples from Hangzhou, China, and analysed correlations between PFAS burden and functional quality markers including catechin composition and antioxidant activity.
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