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    SYTHESIS AND CHARACTRIZATION OF CHITOSAN BIOPOLYMER
    (Kongunadu Arts and Science College, Coimbatore, 2019-09-19) Thilagavathi P; Sharmila C; Ranjith Kumar R; Chandrashekar B
    Chitin is one of the most abundant natural polysaccharides and it is mainly used for the production of chitosan by a de-acetylation process. Chitosanis a biopolymer used as a packing material in food industry. Chitosan biopolymer is an effective material, due to its functional properties such as antibacterial activity, non-toxicity and biodegradability. The main objective of the study focuses on the synthesis and characterization of the chitosan biopolymer. The chitosan is synthesized by wet chemical synthesis method. The absorbance characteristic was studied by UV visible spectroscopic technique. The crystallinity of the material was confirmed by X-ray diffraction technique. The morphological structure of the polymer sheet was confirmed by SEM analysis. The mechanical strength of the chitosan bio-polymer was analyzed by Tensile and Tear techniques and from the result it is observed that the elongation% and force of biopolymer sheet is about 117% and 1.12 N.
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    SYNTHESIS AND CHARACTERIZATION OF AG-DS BIOPOLYMER COMPOSITES
    (Anna University Chennai, 2019-01-03) Sharmila C; Dinesh M; Chandarshekar B
    Chitosan (CS) biopolymer was added with low loading silver (Ag) metal nanoparticles to form Ag-CS biopolymer composite. Chitosan is a very promising biopolymer because it is environmental friendly due to its biodegradability and is degraded by enzymes in human body without any toxic effect. The major concern of the study focuses on the synthesis and characterization of the biopolymer composite. Different characterization techniques like X-ray Diffraction Analysis (XRD), Fourier Transform Infrared Spectroscopic analysis (FTIR), Scanning Electron Microscopy (SEM) along with Energy Dispersive X-ray Analysis (EDAX) and UV Spectroscopic analysis, was employed to analyze the nature of the biopolymer composite. The antibacterial activity of the biopolymer composite was also studied.
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    ENHANCED ANTIMICROBIAL ACTIVITY OF ALOE VERA BLENDED ZINC OXIDE NANOPARTICLES IN PVA MATRIX
    (Amritha University, Coimbatore, 2016-12-20) Chandran, Sharmila; Chemmanda Sunny, Jincy; Chandran, Selvi; Bellan, Chandrashekar
    Aloe vera, a traditional medicinal plant belongs to Liliaceae family that has been adored for centuries as a remedy for skin infections & cuts. The active ingredients such as berberine and gallic acid present in Aloe vera plays a major role in making the plant a therapeutic agent. In order to increase the efficiency of the plant, ZnO is blended with Aloe vera gel. The Aloe vera blended ZnO nanoparticles was then encapsulated using Polyvinyl Alcohol (PVA) polymer and were subjected to different characterization techniques. The cell viability of Aloe vera blended ZnO nanoparticles in PVA matrix was evaluated and in vitro studies against wound creating pathogens were carried out.
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    GREEN SYNTHESIS OF SILVER NANOPARTICLES (AG NPS) USING GOMPHRENA GLOBOSA (GLOBE AMARANTH) LEAF EXTRACT, CHARACTERIZATION, AND ANTIBACTERIAL ACTIVITY
    (Amrita Vishwa Vidyapeetham, Coimbatore, 2019-12-15) Tamilarasi P; Meena P
    Among the various methods explored for the synthesis of silver nanoparticles (Ag NPs), the green synthesis method has received great attention as a cost effective and environmental friendly method as it avoids toxicity. In the present work, silver nanoparticles were synthesized using silver nitrate as the precursor and an aqueous extract of fresh leaves of Gomphrena globosa (Globe amaranth) as the reducing and stabilizing agent. The active phytochemicals present in the leaves cause quick reduction of silver ions (Ag+) to metallic silver nanoparticles (Ag0). The formation of Ag nanoparticles was initially confirmed by visual observation through the color change of the mixture. The silver nanoparticles obtained were characterized using UV-visible absorption spectroscopy, X-ray diffraction (XRD), Fourier transform infra-red spectroscopy (FTIR), Scanning electron microscopy (SEM), Energy dispersive X-ray analysis (EDAX), High-resolution transmission electron microscopy (HR-TEM), and Selected area electron diffraction (SAED) analysis. The synthesized silver nanoparticles show excellent antibacterial activity against three gram-positive bacteria (Staphylococcus aureus, Bacillus subtilis, Micrococcusluteus) and three gram-negative bacteria (Escherichia coli, Pseudomonas aeruginosa, and Klebsiella pneumoniae).