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HPLC–DAD analysis of six constituents in GRE and AGRE. (A) Chemical structures of six constituents: 1, gallic acid; 2, methyl gallate; 3, digallic acid; 4, syringic acid; 5, ellagic acid; and 6, PGG. (B) HPLC–DAD analyses of the six components in GRE and AGRE at 270 nm: (a) mixed standards, (b) GRE, and (c) AGRE. (C) Contents of six components in GRE and AGRE: 1, gallic acid; 2, methyl gallate; 3, digallic acid; 4, syringic acid; 5, ellagic acid; and 6, PGG.
