This study aims to develop a nanodrug delivery system
containing
podophyllotoxin (PTOX), a known anticancer drug, loaded on graphene
oxide (GO). The system’s ability to inhibit α-amylase
and α-glucosidase enzymes was also investigated. PTOX was isolated
from Podophyllum hexandrum roots with
a yield of 2.3%. GO, prepared by Hummer’s method, was converted
into GO-COOH and surface-mobilized using polyethylene glycol (PEG)
(1:1) in an aqueous medium to obtain GO-PEG. PTOX was loaded on GO-PEG
in a facile manner with a 25% loading ratio. All the samples were
characterized using FT-IR spectroscopy, UV/visible spectroscopy, and
scanning electron microscopy (SEM). In FT-IR spectral data, GO-PEG-PTOX
exhibited a reduction in acidic functionalities and there was an appearance
of the ester linkage of PTOX with GO. The UV/visible measurements
suggested an increase of absorbance in 290–350 nm regions for
GO-PEG, suggesting the successful drug loading on its surface (25%).
GO-PEG-PTOX exhibited a rough, aggregated, and scattered type of pattern
in SEM with distinct edges and binding of PTOX on its surface. GO-PEG-PTOX
remained potent in inhibiting both α-amylase and α-glucosidase
with IC50 values of 7 and 5 mg/mL, closer to the IC50 of pure PTOX (5 and 4.5 mg/mL), respectively. Owing to the
25% loading ratio and 50% release within 48 h, our results are much
more promising. Additionally, the molecular docking studies confirmed
four types of interactions between the active centers of enzymes and
PTOX, thus supporting the experimental results. In conclusion, the
PTOX-loaded GO nanocomposites are promising α-amylase- and α-glucosidase-inhibitory
agents when applied in vitro and have been reported
for the first time.