  This research work showcases a non-toxic approach to synthesize carbon
nanoparticles (CNPs) from various medicinal plants namely Syzygium cumini, Holy
basil, Azadirachta indica A, Psidium guajava, Mangifera indica, and Bergera
koenigii using microwave approach. The optical, morphological, structural, and
functional properties of obtained CNPs from all mentioned sources were
investigated using UV-Vis, Scanning electron microscopy (SEM), Fourier
transform infrared spectrophotometry (FTIR), dynamic light scattering (DLS),
zeta potential tests and X-ray diffraction (XRD). With great water
dispersibility, and photostability all the medicinal sources chosen yielded in
bright red fluorescent nanoparticles under exposure to UV light, thereby giving
a significant peak around 650 nm recorded in absorption spectrum. Antoxidant
assay was performed on all these six different plant-derived nanoparticles with
two different concentrations and all have exhibited excellent free radical
(DPPH) scavenging activity, proving their role as antioxidants. This further
opens up doors for various other plant and biomedical applications to be
targeted using these CNPs.
