Green synthesis of silver nanoparticle composites with cashew gum and curcumin: Development of nano-structured products based on natural polymer for forensic human identification applications

The combination of cashew gum (GC) and curcumin (Cur) was explored in the production of Ag nanoparticles (AgNps) by green synthesis, for the development of a fingerprint marker. For this, GC (0.5 % w/v) was added to an aqueous solution of AgNO₃, with and without Cur (1/1). The reduction was carried out in a microwave oven at 2450 MHz for 3 min. AgNps were characterized by UV-vis spectrophotometry, zeta potential, DLS, infrared spectroscopy, computer simulations, AFM and cytotoxicity in HaCat cells. Latent fingermarks on white sulfite-type porous paper were developed after immersion and drying. Synthesis of CG-AgNp and CG-Cur-AgNp preserved the main physicochemical characteristics of CG and Cur. In UV-visible spectrum, it presented bands at 420 nm and 480 nm, with a hydrodynamic diameter of 135.2 nm for CG-AgNp and 175.10 nm for CG-Cur-AgNp. By AFM, the AgNps have a spherical shape with homogeneous diameter, ranging from 31.63 nm (CG-AgNp) and 34.81 nm (CG-Cur-AgNp). Not show significant reduction in cell viability in HaCat cells (3.125-0.781 μM of Ag). It was observed that the revelations at 0 h and 24 h after the production of the IDLs, with 12 points marked with nanoparticles.