An interesting trend was observed regarding GA concentration—in teas the most rich in catechins (Korean and Japanese samples) the content of gallic acid was much lower compared to other samples (e.g., Chinese, Indian or products from Sri Lanka).
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Green Tea Quality Evaluation Based on Its Catechins and Metals Composition in Combination with Chemometric Analysis.
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Regarding Ni, green tea may be significant route of exposure to this heavy metal as for some samples (green tea from South Korea) dietary intake contributed to 6% of TDI value, which is high taking into account the consumption of only one cup per day (200 mL).