Yellowtops (Flaveria haumanii) LC

File:.jpg

/ picture from Denver Botanic Gardens

Analytical instrumentation and procedures

HPLC-DAD-MS analysis was performed with an Agilent 1100 liquid chromatography system consisting of an automatic injector, a gradient pump, a HP series 1100 DAD, and an Agilent series 1100 VL on-line atmospheric pressure ionization electrospray ionization mass spectrometer. Separations were done on a Vydac 214TP52 analytical column (2.1 mm diameterX250 mm; 5-ím particle size). The column was eluted at a flow rate of 0.2 mL/min with a tertiary gradient of water (A),acetonitrile (B), and 1% (v/v) aqueous formic acid (C) with the following elution program: 0 min, 90% A, 5% B, 5% C; 0-55 min, a linear gradient to 35% A, 60% B, 5% C; 55-60 min, a linear gradient elution to 15% A, 80% B, 5% C; 60-62 min, isocratic elution at 15% A, 80% B, 5% C; 62-70 min gradient elution to 90% A, 5% B, 5% C; and reequilibration with the latter solvent for 15 min. The mass spectrometer was run both in the negative and positive ion mode.

Chromatograms

Absorbance at 350nm (mAU)

Sample Information

sample information by R. A. Laursen, Boston Univesity

Identified compounds

quercetin 3-O-sulfate UV-Vis

Isorhamnetin 3-O-sulfate UV-Vis

Compound	RT (min.)	MW	UV/vis	Other
quercetin 3-O-sulfate	24.4	382	278,348	Comments here
isorhamnetin 3-O-sulfate	27.1	394	280,350
kaempferol	39.0	286	280,395,368
isorhamnetin	39.0	316	280,395,368

References

[1] [2] [3]