Table 1.

HPLC-ESI/MS data and identities of compounds associated with peaks detected in the HPLC chromatograms of samples of Polygonum multiflorum.

Peaka	Retention time (min)	Identification	[M+H]+ (m/z)	[M−H]+ (m/z)	[M+Na]+ (m/z)	Λmax   (nm)
1	17.625	Rhein	—	283	307	256, 430
2	19.642	Emodin	271	—	293	288, 438
3	21.745	Chrysophanol	255	—	277	256, 428
4	22.501	Physcion	285	—	307	286, 436
5	12.149	2,3,5,4′-Tetrahydroxystilbene-2-O-β-D-glucoside	407	—	429	214, 320
6	12.156	2,3,5,4′-Tetrahydroxystilbene-2-O-β-D-glucoside	407	—	429	214, 320
7	19.658	Emodin	271	—	293	288, 438
8	22.512	Physcion	285	—	307	286, 436

^aPeak shown in the chromatograms presented in Figure 1.