Annamalai University

About: Annamalai University is a education organization based out in Chidambaram, Tamil Nadu, India. It is known for research contribution in the topics: Lipid peroxidation & Antioxidant. The organization has 8098 authors who have published 10758 publications receiving 203872 citations.

Development of surfactin based nanoemulsion formulation from selected cooking oils: evaluation for antimicrobial activity against selected food associated microorganisms

Abstract: Selected cooking oils such as sunflower, castor, coconut, groundnut, and sesame oils were screened for the development of a surfactin based nanoemulsion formulation. Mean droplet size of different surfactin based cooking oil emulsions varied from 72.52 to 875.22 nm with the least size recorded by sunflower oil based nanoemulsion formulation. On further screening for antibacterial activity sunflower oil-based nanoemulsion designated as AUSN-1 showed highest activity against Salmonella typhi , followed by Listeria monocytogenes , and Staphylococcus aureus . AUSN-1 also demonstrated a high fungicidal activity against Rhizopus nigricans , followed by Aspergillus niger and Penicillium sp. and a greater sporicidal activity against Bacillus cereus and Bacillus circulans . In situ evaluation of AUSN-1 for antimicrobial activity on food products such as raw chicken, apple juice, milk and mixed vegetable showed a significant reduction in the native cultivable bacterial and fungal populations of these products.

Synthesis of ZnO nanoparticles using insulin-rich leaf extract: Anti-diabetic, antibiofilm and anti-oxidant properties.

Abstract: Here, we report the novel fabrication of ZnO nanoparticles using the Costus igneus leaf extract. Gas chromatography-mass spectrometry (GC–MS) and proton nuclear magnetic resonance ( 1 H NMR) spectroscopy to determine the bioactive components present in the plant extract. The synthesis of Ci -ZnO NPs ( C. igneus - coated zinc oxide nanoparticles) was accomplished using a cost-effective and simple technique. Ci -ZnO NPs were specified using UV–visible spectroscopy, FTIR, XRD, and TEM. Ci -ZnO NPs was authenticated by UV–Vis and exhibited a peak at 365 nm. The XRD spectra proved the crystalline character of the Ci -ZnO NPs synthesized as hexagonal wurtzite. The FTIR spectrum illustrated the presence of possible functional groups present in Ci -ZnO NPs. The TEM micrograph showed evidence of the presence of a hexagonal organization with a size of 26.55 nm typical of Ci -ZnO NPs. The α-amylase and α-glucosidase inhibition assays demonstrated antidiabetic activity of Ci -ZnO NPs (74 % and 82 %, respectively), and the DPPH [2,2-diphenyl-1-picrylhydrazyl hydrate] assay demonstrated the antioxidant activity of the nanoparticles (75%) at a concentration of 100 μg/ml. The Ci -ZnO NPs exhibited promising antibacterial and biofilm inhibition activity against the pathogenic bacteria Streptococcus mutans , Lysinibacillus fusiformis , Proteus vulgaris , and Vibrio parahaemolyticus . Additionally, the Ci -ZnO NPs showed biocompatibility with mammalian RBCs with minimum hemolytic activity (0.633 % ± 0.005 %) at a concentration of 200 μg/ml.

Bio-composites: Development and mechanical characterization of banana/sisal fibre reinforced poly lactic acid (PLA) hybrid composites

Abstract: The work focuses on the influencing effect of fiber surface treatment by BP towards mechanical properties of BSF reinforced PLA composites. BSF were treated by BP to improve the adhesion between fibres and matrix. BSF (30 wt %) reinforced PLA (70 wt %) hybrid composites were fabricated by means of twin screw extrusion followed by injection molding process. Tensile strength, flexural strength and modulus were tested by means of UTM. The morphological analysis of the untreated and treated BSF reinforced PLA composites in comparison with virgin PLA was carried out by SEM to examine the existence of interfacial adhesion between BSF and PLA. The resultant data reveals that treated BSF restricts the motion of the PLA matrix due to better wettability and bonding. Consequently, mechanical properties like tensile and flexural moduli of BSF reinforced PLA composites were enhanced in comparison to virgin PLA and untreated BSF reinforced PLA composites. The results are discussed in detail.