Statically controlled mycogenic-synthesis of novel biologically active silver-nanoparticles using Hafr Al-Batin desert truffles and its antimicrobial efficacy against pathogens

Abstract

In our search for new unconventional green-reducing agent, can be applied for biosynthesis of biologically active silver-nanoparticles, fruiting bodies (Ascocarps) of Truffle Terminia sp. were collected from the sandy desert of Hafr Al-Batin, Eastern Region, Saudi Arabia. The desert truffle showed the ability to reduce AgNO3 to Ag0 depending on their high content of proteins (1.74 mg/ml) in the aqueous extract of 30 mg/ml (w/v). The response surface methodology (RSM) with 13 experiments of 2–Factors–5–Levels central composite design was applied for controlling all possible combinations of AgNO3 concentrations and pH values of reaction mixture, which directly affect the particles morphology, size and biological activity. The antimicrobial effectiveness of all synthesized nanoparticles was evaluated against the pathogenic strains by agar diffusion method. The pathogenic Gram-positive Staphylococcus aureus, Bacillus subtilis, Lactobacillus cereus, and Gram-negative Escherichia coli, Salmonella enterica, yeast strain Candida albicans and the fungus Aspergillus niger were evaluated. The biologically active Truffle-AgNPs were characterized by UV–visible spectrophotometry, transmission electron microscopy (TEM), spectrum and dynamic light scatter (DLS), and Fourier Transformed Infrared (FTIR). Results obtained indicated that, the statistically controlled Truffle-AgNPs have great inhibitory role affecting different pathogenic strains, which gained much attention towards application of Hafr Al-Batin-Truffle as reducing and stabilizing biomaterial for green nano-drugs biosynthesis, to resist harmful pathogens threaten human health.