HPLC: Shimadzu Prominence with diode array SPP-M20; column mBondapac C18, length 300 mm, I.D. 3.9 mm, particle size 10 μm, ∅ 125 angstroms. Spectrophotometer: Ultraviolet Visible Shimadzu UV-2450 ...

Beckman DU-70 UV/Visible spectrophotometer, equipped with 1 cm quartz cell, computer and printer Epson FX-850. Methods. Sample preparation. 1.0 g of all samples was weighed, transferred to a 100 mL ...