HPLC Analysis of Withania Compounds on Ascentis^® Express Phenyl-Hexyl

column

Ascentis Express Phenyl-Hexyl, 10 cm x 2.1 mm I.D., 2.7 μm particles (53336-U)

mobile phase

[A] water; [B] acetonitrile

gradient

20 to 100% B in 10 min; held at 100% B for 0.5 min

flow rate

0.3 mL/min

pressure

2321 psi (160 bar)

column temp.

35 °C

detector

UV, 227 nm

injection

5 μL

sample

20 μg/mL in water: methanol (80:20)