Phytochemical Investigation of Crataegus almaatensis Leaves: Isolation, Structural Characterization, and Antioxidant Activity of Flavonoids, Flavolignans, and Phenolic Glycosides
A systematic phytochemical investigation of the leaves of Crataegus almaatensis Pojark., an endemic hawthorn species native to the mountainous regions of Kazakhstan, was carried out. Multi-step chromatographic fractionation, comprising ultrasound-assisted methanol extraction, sequential liquid–liquid partitioning, sili...