Inhibitory Activities of Stauntonia hexaphylla Leaf Constituents on Rat Lens Aldose Reductase and Formation of Advanced Glycation End Products and Antioxidant

Table 4

Inhibitory effect of compounds isolated from Stauntonia hexaphylla leaves on DPPH radical scavenging activity.

Compounds	IC50
3-(3,4-Dihydroxyphenyl)-propionic acid (1)	109.73 ± 9.39
Chlorogenic acid (2)	162.60 ± 14.39
Neochlorogenic acid (3)	>1000
Calceolarioside B (4)	94.60 ± 6.86
Luteolin-3′-O-β-D-glucopyranoside (5)	96.28 ± 9.19
Quercetin-3-O-β-D-glucopyranoside (6)	122.34 ± 10.94
Luteolin-7-O-β-D-glucopyranoside (7)	>1000
L-ascorbic	54.39 ± 5.73

IC₅₀ value was defined as a mean ± SEM of half-maximal inhibitory concentration from three independent experiments performed in duplicate.
-ascorbic acid is the positive control for DPPH radical scavenging activity.