Synthesis of Eco-friendly Nano-composites and its antibacterial activities: nanomaterials

Biosynthesis of nanoparticles is associated with natural resources such as plants, bacteria, fungi and algae. Specifically, green synthesis of plant extract based nanoparticles has gained significant interest in last decades due to environment friendly, simple preparation, non-toxic and inexpensive method [1-2]. Various plants including aloe Vera, Tulsi, lemon, neem, coriander, mustard, have been utilized for the synthesis of nanoparticles. The advantage of using plants for the synthesis of nanoparticles are abundant in nature, harm-free to handle and possess various metabolites that result in reduction [3-4]. Nanomaterials are widely used as antifungal/antibacterial agents in numerous fields including cosmetics, therapeutics, diagnostics, food and other chemical industries. These nanomaterials are synthesized using various approaches, however the use of chemical methods are lead to toxic and non-eco-friendly products, hence, there is an urge to prepare the nanomaterials with free of toxic. In this study, we synthesised and characterized the plant mediated silver nanoparticles based composites using Cissus quandrangularis and Ocimum tenuiflorum[5]. These eco-friendly nanoparticles were encapsulated with natural polymers and characterized by UV–Vis spectrophotometer, FT-IR and Scanning electron microscopy shown in figure 1 and 2. In addition, synthesized nanocompostites were evaluated for antibacterial activity by disc diffusion method against Gram-negative (Escherichia coli, Staphylococcus aureus and Pseudomonas sps) bacteria showed higher antibacterial activity[6]. The results shows that the nanoparticles were found to be embedded in the chitosan and also the particle size of CS-AgNP was found to be higher than that of AgNPs. The synthesized chitosan–silver nanocomposites exhibited increased antibacterial activity against S.aureus, E.coli and Pseudomonas sp than the synthesized AgNPs. Hence, these synthesised eco-friendly nanocomposites may be used as anti-microbial packaging materials, wound dressings and grafting applications[7-8].