title: Antibacterial Activity and Synergistic Antibacterial Potential of Biosynthesized Silver Nanoparticles against Foodborne Pathogenic Bacteria along with its Anticandidal and Antioxidant Effects.
abstract: Silver nanoparticles plays a vital role in the development of new antimicrobial substances against a number of pathogenic microorganisms. These nanoparticles due to their smaller size could be very effective as they can improve the antibacterial activity through lysis of bacterial cell wall. Green synthesis of metal nanoparticles using various plants and plant products has recently been successfully accomplished. However, few studies have investigated the use of industrial waste materials in nanoparticle synthesis. In the present investigation, synthesis of silver nanoparticles (AgNPs) was attempted using the aqueous extract of corn leaf waste ofZea mays, which is a waste material from the corn industry. The synthesized AgNPs were evaluated for their antibacterial activity against foodborne pathogenic bacteria (Bacillus cereusATCC 13061,Listeria monocytogenesATCC 19115,Staphylococcus aureusATCC 49444,Escherichia coliATCC 43890, andSalmonellaTyphimurium ATCC 43174) along with the study of its synergistic antibacterial activity. The anticandidal activity of AgNPs were evaluated againstCandidaspecies (C. albicansKACC 30003 and KACC 30062,C. glabrataKBNO6P00368,C. geocharesKACC 30061, andC. saitoanaKACC 41238), together with the antioxidant potential. The biosynthesized AgNPs were characterized by UV-Vis spectrophotometry with surface plasmon resonance at 450 nm followed by the analysis using scanning electron microscope, X-ray diffraction, Fourier-transform infrared spectroscopy and thermogravimetric analysis. The AgNPs displayed moderate antibacterial activity (9.26-11.57 mm inhibition zone) against all five foodborne pathogenic bacteria. When AgNPs were mixed with standard antibacterial or anticandidal agent, they displayed strong synergistic antibacterial (10.62-12.80 mm inhibition zones) and anticandidal activity (11.43-14.33 mm inhibition zones). In addition, the AgNPs exhibited strong antioxidant potential. The overall results highlighted the potential use of maize industrial waste materials in the synthesis of AgNPs and their utilization in various applications particularly as antibacterial substance in food packaging, food preservation to protect against various dreadful foodborne pathogenic bacteria together with its biomedical, pharmaceutical based activities.
authors.affiliation: Research Institute of Biotechnology and Medical Converged Science, Dongguk University-Seoul Goyang-si, South Korea.
authors.forename: Jayanta Kumar
authors.initials: JK
authors.lastname: Patra
authors.affiliation: Department of Biotechnology, Yeungnam University Gyeongsan, South Korea.
authors.forename: Kwang-Hyun
authors.initials: KH
authors.lastname: Baek
keywords: Zea mays; antibacterial; anticandidal; antioxidant; foodborne bacteria; green synthesis; silver nanoparticles