Table 1.

HPLC-DAD and ESI-MS data for quercetin derivatives from the leaves of B . longifolia

		t R	[M-H]	λ max
Compound	Name	(min)	( m/z )	(nm)
1	Guaijaverin	12.7	433	255, 354
2	Quercetin	22.1	301	255, 368
3	Quercitrin	14.4	447	256, 352
4a	Isoquercitrin	9.3	463	256, 356
4b	Hyperin	10.2	463	255, 356

^tR – retention time (in min).

^[M-H]- – pseudo molecular ion observed on the ESI-MS spectra at the negative mode.

^{λ max} – maximum absorption bands in the UV spectra.