In this work, cellulose-based composite biofilms doped with silver nanoparticles (AgNPs) have been produced by eco-friendly process. The AgNPs were synthesized from Ilex paraguariensis with an average size of 45 nm, a characteristic plasmon band at 450 nm and zeta potential of -23 mV. The biofilm has been synthesized by casting method, using different volumes of AgNPs suspension with glycerol plasticizing agent (T6-T10) or not (T1-T5). The AgNPs were successfully incorporated into the biofilms, which was confirmed by scanning electron microscopy. The mechanical and optical structural and the antimicrobial properties of the biofilms have been determined. In the presence of AgNPs, the mechanical properties, thermal stability and water vapor barrier of the biofilms have not been altered. However, the addition of glycerol decreased the tensile strength and the modulus of elasticity, in addition to increasing the elongation of the biofilms and the water vapor barrier. The biofilm T10 showed a transmittance of ca. 10%, with high potential to be used as a UV light blocker. Finally, the biofilms doped with AgNPs showed activity against the bacterium Pseudomonas fluorescens. Given the above, this work presented a new biofilm with activity against the bacterium Pseudomonus fluorescens obtained by eco-friendly process.

Twelve tetraphenylphosphonium allyldithiocarbimates were synthesized and fully characterized by high-resolution electrospray ionization mass spectrometry (HR-ESI-MS), infrared and nuclear magnetic resonance (NMR) spectroscopies. The spectroscopic data indicated that the allyldithiocarbimate anions present Z configuration, as confirmed by X-ray crystallography. These new compounds inhibited the germination of Phakopsora pachyrhizi and Hemileia vastatrix at very low doses, with IC50 (concentration to achieve 50% of inhibition of spore germination) values ranging from 0.028 to 0.166 mmol L-1, and IC90 (concentration to achieve 90% of inhibition of spore germination) values varying from 0.156 to 0.528 mmol L-1. Allyldithiocarbimate salts are lead compounds for the development of new antifungals for coffee leaf rust and Asian soybean rust, devastating plant diseases with limited control options.