L-Theanine was the most abundant non-protein amino acid in purple-colored leaf tea, and its content showed a trend of firstly increasing and then decreasing during the anaerobic treatment, which is consistent with the previous study ( Dai et al., 2020 ).
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Effects of anaerobic treatment on the non-volatile components and angiotensin-converting enzyme (ACE) inhibitory activity of purple-colored leaf tea.
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