Chemical transformation of oolongtheanin 3′-O-gallate in aqueous solution under heating conditions

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Abstract To understand the stability of oolongtheanin 3′-O-gallate (1), present in oolong tea leaves, its chemical transformation in aqueous solution was investigated under heating conditions. Four compounds were obtained from 1, which were isolated and their chemical structures were confirmed by NMR and MS. The results showed that 1 exists as an equilibrium mixture in water. Only one product was produced from the equilibrium form of 1, while the rest were produced from the other forms of 1.

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