Characterization and bacterial toxicity of lanthanum oxide bulk and nanoparticles |
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Authors: | Brabu Balusamy Yamuna Gowri Kandhasamy Anitha Senthamizhan Gopalakrishnan Chandrasekaran Murugan Siva Subramanian Tirukalikundram S Kumaravel |
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Affiliation: | Brabu Balusamy1,2, Yamuna Gowri Kandhasamy2, Anitha Senthamizhan3, Gopalakrishnan Chandrasekaran1, Murugan Siva Subramanian2,4, Kumaravel Tirukalikundram S2,4 (1. Nanotechnology Research Center, SRM University, Chennai-603203, India; 2. GLR Laboratories Private Limited, Chennai-600 060, India; 3. Department of Physics, Indian Institute of Technology-Madras, Chennai-600 036, India; 4. GLR Laboratories Private Limited, Willingham, Cambridge, CB24 5GX, United Kingdom) |
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Abstract: | This study evaluated the bacterial toxicity of lanthanum oxide micron and nano sized particles using shake flask method against gram-positive (Staphylococcus aureus) and gram-negative (Escherichia coli, Pseudomonas aeruginosa) bacteria. Particle size, morphology and chemical composition were determined using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). Results indicated that lanthanum oxide nanoparticles showed antimicrobial activity against Staphylococcus aureus, but not against Escherichia coli and Pseudomonas aeruginosa. It was speculated that lanthanum oxide produced this effect by interacting with the gram-positive bacterial cell wall. Furthermore, lanthanum oxide bulk particles were found to enhance the pyocyanin pigment production in Pseudomonas aeruginosa. |
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