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The content of (a) essential amino acids and (b) L‐theanine in green tea, tea extract, and SGTP. L‐theanine was analyzed by HPLC with Agilent ZORBAX SB‐C18 (5 μm, 4.6 × 250 mm). The essential amino acid composition was identified and quantified by an amino acid analyzer L‐8900 (Hitachi, Tokyo, Japan)
