Garden Onion: Garden Onion

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INTRODUCTION : Allium cepa commonly known as garden onion, is the main representative genus of the Liliaceae family. A. cepa is a bulbous plant widely cultivated with mass production in China, India and United States. It is rich in proteins, carbohydrates, sodium, potassium and phosphorus. Traditionally onion has been used to treat intestinal infections, eye infections, ear ache, urinary tract burning, headaches associated with drowsiness, ulcers on heels and cough resulted from inspiration of cold air. Many reports revealed that onion was found to have antibacterial, antiviral, antiparasitic, antifungal, antihypertensive, anti-hypoglycemic, antithrombotic, antihyperlipidemic, anti-inflammatory and antioxidant activities[1].Onion has also shown…show more content…
Furthermore, ZnO appears to strongly resist microorganisms and some reports show considerable antibacterial activity of CaO, MgO and ZnO, which is attributed to the generation of reactive oxygen species on the surface of these oxides [37]. In spite of these merits, ZnO is bio-safe, biocompatible with unique ability like structure-dependent properties, electrical and thermal transport properties, which could be varied with respect to particle size, shape, morphology, orientation and aspect ratio, have resulted in increased interest in obtaining this Nano metal oxide material. Chemical methods lead to the presence of some toxic chemicals adsorbed on the surface that may have adverse effects in medical application. Increasing awareness towards green chemistry and other biological processes has led to the development of an eco-friendly approach for the synthesis of nanoparticles [38]. The use of environmentally benign materials like plant leaf extract, bacteria, fungi and enzymes for the synthesis of zinc oxide nanoparticles offers numerous benefits of eco friendliness and compatibility for pharmaceutical and other biomedical applications, where toxic chemicals are not used for the synthesis protocol. Although biosynthesis of gold nanoparticles by plants such as alfalfa Cinnamomumcamphora, neem, Emblicaofficinalis, lemon grass and tamarind [39] have been reported, the potential of plants as biological materials for the synthesis of nanoparticles is yet to be fully explored. The present investigation describes for the first time, synthesis, characterization and optical properties of ZnO nanoparticles prepared by both chemical and biological (green) techniques using Allium cepa, Different researchers have described different processing techniques of the gel with regard to its sterilization and

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