Fluorescent properties of chitosan-stabilized bisdemethoxycurcumin-silver nanoparticles: Synthesis and characterization

The extraction and modification of naturally-occurring compounds are widely performed due to their valuable medicinal and physical properties. Herin, we reported the extraction of bis-demethoxycurcumin from Ragbrai turmeric root. The isolated derivative was characterized by X-ray diffraction, IR, and NMR spectroscopy. Also, the green synthesis of bis-demethoxycurcumin chitosan silver BDMC-Ag-Ch nanoparticles is illustrated. These nanoparticles are identified by atomic force microscopy AFM and exhibit average particle size ∼ 53.41 nm The crystalline structure was confirmed by XRD analysis, which showed distinct peaks corresponding to silver oxide nanoparticles and Zeta power measurements revealed stable dispersion of the nanoparticles, indicating a good chitosan coating on the surface of bis-demethoxycurcumin Ag nanoparticles. The absorption bands at 240 and 405 nm are due to oxygen atom (n → π*) and aromatic (π → π*) transitions in curcumin and Chitosan molecules. The photoluminescence (PL) study of synthesized BDMC-Ag-Ch nanoparticles demonstrated an existence of two emission excited states in light-emitting, namely local excited (LE) and intramolecular charge transfer (ICT) emission states, due to the aromatic conjugation system within BDMC units and intra charge transfer between the silver ion and organic part.