Characterization of the samples were carried out using a Bruker AXS
D8 Advance X-ray diffractometer (XRD) operated at a voltage of 40 kV
and a current of 30 mA with Cu Kα radiation (1.540 Å) between 2θ°
angles of (30°–80°) for analyzing the crystal structure and peak data respectively.
UV–vis spectral analysiswas carried out using a JASCO V-700
spectrophotometer. UV–Visible spectrums of SNPs were recorded
between the range from 300 to 600 nm. Particle size distribution was
carried out by a Dynamic Light Scattering (DLS)-Horiba nanoparticle analyzer
SZ-100 equipped with a 532 nm laser. Fourier transforminfrared
spectroscopy (FT-IR) studies were carried out using a Shimadzu FTIR
spectrophotometer (FTIR 8400). The obtained samples were prepared
using the KBr pellet technique andwere analyzed to check the presence
of bio-functional moieties of coffee extract and the surface chemistry
Fig. 1.