Table 1. Concentration of five polyphenols in TPQE by HPLC-DAD analysis (n = 3).

Peak number	Compound name	Concentration (mg/g)
1	Gallic acid	27.66 ± 0.99
2	1,2,3-tri-O-galloyl-β-D-glucopyranose	19.89 ± 0.07
6	1,2,3-tetra-O-galloyl-4,6-O-hexahydroxydiphenoyl-β-D-glucopyranoside	182.12 ± 2.38
7	1,2,3,6-tetra-O-galloyl-β-D-glucopyranose	461.91 ± 7.28
8	1,2,3,4,6-penta-O-hexahydroxydiphenoyl-β-D-glucopyranoside	4.04 ± 0.09