Enhanced antioxidant activity of gold and silver nanoparticles of
Scopoletin isolated from Sophora mollis
Abstract
This study aimed to increase the antioxidant potential of Scopoletin by
utilizing green synthesis to create gold and silver nanoparticles. Pure
Scopoletin was obtained from the aerial parts of S. mollis and
identified using spectroscopic techniques The synthesized AuNPs and
AgNPs were characterized using UV-visible spectroscopy, FT-IR
spectroscopy, and scanning electron microscopy (SEM). The results
indicated that the gold nanoparticles had diameters ranging from 58 to
81 nm, while the silver nanoparticles were spherical in shape with
diameters ranging from 75 to 89 nm. The radical scavenging capacity of
Scopoletin, AuNPs, and AgNPs was evaluated using the DPPH method. The
highest radical scavenging capacity was exhibited by AgNPs, with a
percentage inhibition of 76.114 ± 0.030% at a concentration of 400
µg/ml. In comparison, the highest radical scavenging capacity of AuNPs
was 65.924 ± 0.018%, while the native compound showed weak activity at
16.641 ± 0.0955% at the same concentration. The results demonstrated an
improved radical scavenging capacity of AgNPs and AuNPs, with ratios
five and four times higher, respectively, compared to pure Scopoletin at
the same concentration level. These findings suggest potential
biomedical applications for the synthesized nanoparticles.