Physico-Chemical Properties and Inhibitory Effects of Commercial Colloidal Silver Nanoparticles as Potential Antimicrobial Agent in the Food Industry

Abstract

The physico-chemical characteristics and inhibitory effects of commercial colloidal silver nanoparticles were investigated against food-borne pathogens to obtain silver nanoparticles as a potential effective antimicrobial agent in the food industry. Using scanning electron microscope and energy dispersive X-ray microanalysis, the structure and presence of silver nanoparticles were confirmed. The application of silver nanoparticles at concentration of 2 and 0.25 µg mL−1 inhibited the growth of tested pathogenic strains. The use of Ag nanoparticles is a crucial aspect, as diverse pathogenic microbes have developed mechanisms of bacterial resistance to antimicrobial compounds. The obtained results show that the effectiveness of solutions comprising nano silver depends on the dilution of silver nanoparticles, the susceptibility of the microorganism and the chemical composition. These nanomaterials, which can be produced in a simple, cost-effective manner and which are non-toxic, may be suitable for the formulation of new types of antimicrobial agents. Practical Applications Nanotechnology and nanoscale products development are playing increasingly significant roles in pioneering, emerging technologies and solutions. The development of colloidal or nanoscaled silver particles in recent years is one such evidence of the announced advantages of using an engineered nanoparticle, in this instance for health and food protection. The use of silver nanoparticles to prevent food commodities and water from contamination has received increasing amounts of attention within the last decade, especially due to its potential for wider application, high degrees of reactivity, and cost-effectiveness relatively to conventional applications. To prevent food poisoning, i.e., pathogenic strains, Ag nanoparticles are nowadays put in surface disinfectants, cutting boards or table tops. Conducted research addresses the challenges considering and assessing the expected health benefits connected with antimicrobial activity and the potential weaknesses of this emerging environmentally friendly nanotechnology, notably important for decision makers, engineers and scientists.