Eco friendly synthesis of TiO 2 nanoparticles using aqueous Ocimum americanum L. leaf extracts and their antimicrobial,
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Eco friendly synthesis of TiO2 nanoparticles using aqueous Ocimum americanum L. leaf extracts and their antimicrobial, anti‑proliferative and photocatalytic activities S. Vijayakumar1 · E. Vidhya1 · G. Chinnu Anand1 · M. Nilavukkarasi1 · V. N. Punitha1 · B. Sakthivel2 Received: 10 March 2020 / Revised: 20 July 2020 / Accepted: 23 July 2020 © Society for Plant Research 2020
Abstract Bio-synthesis of T iO2 nanoparticles was accomplished with Ocimum americanum L leaf extracts. The morphology, optical and functional properties of synthesized T iO2 nanoparticles were characterized by XRD, UV–Vis spectroscopy, FT-IR, and FE-SEM with EDAX respectively. The aqueous extracts of these nanoparticles were evaluated for its antimicrobial activities against Bacillus cereus, Clostridium perfringens, Salmonella paratyphi, Klebseilla pnemoniae, Candida albicans and Aspergillus niger using an agar well method. The antiproliferative activity was analyzed by MTT assay. Photocatalytic analysis against methylene blue dye was investigated. The biosynthesized TiO2 nanoparticles was analyzed by SEM with an average size of the particle was 25 nm. The synthesized TiO2 nanoparticles were exhibited excellent antimicrobial and antiproliferation activities against selected pathogens and human skin cancer cell line (431) respectively and expression of admirable photocatalytic activity with reduction of 91.1%. Based on the above studies, it is concluded that these nanoparticles are eco-friendly, inexpensive and pollution free material which can be applied for multifaceted environmental applications. Keywords Green synthesis · Ocimum americanum · TiO2 · Antimicrobial · Antiproliferative · Photodegradation
Introduction Today, nanotechnology has gathered impending importance in various sectors viz., industrial, pharmaceutical and pollution free environment owing to its unique properties (Debjani and Pratyusha 2013). Among metal oxides, Titanium dioxide (TiO2) is not a hazardous material according to the United Nations (UN). The green synthesis of titanium oxide nanoparticles has more advantage due to their less consumption of chemicals (Baskar et al. 2017). Titanium is a stable metal and has proven to have high photo catalytic and strong antimicrobial activities (Subhapriya and Gomathipriya 2018). The particular method and material was chosen for their ability to act as good reducing and stabilizing agent
(Dobrucka and Długaszewska 2016). In this study, Titanium nanoparticles are synthesized using the leaf extract of Ocimum americanum. To the best of our knowledge, this type of synthesis is the first of its kind. Ocimum americanum is commonly known as American basil or hoary basil, which is widely distributed in Asia, Africa, Central and South America. It is an annual herb belonging to the family Lamiaceae. In Indian traditional system of Ayurveda, it has been used as a medicine for diarrhea, diabetes and skin infection (Reddy et al. 2016). Therefore the aim of the present study is to biosynthesize T iO2 nanopart
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