Characterization and bacterial toxicity of lanthanum oxide bulk and nanoparticles  

作　　者：Brabu Balusamy Yamuna Gowri Kandhasamy Anitha Senthamizhan Gopalakrishnan Chandrasekaran Murugan Siva Subramanian Kumaravel Tirukalikundram S 

机构地区：[1]Nanotechnology Research Center,SRM University [2]GLR Laboratories Private Limited [3]Department of Physics,Indian Institute of Technology-Madras [4]GLR Laboratories Private Limited,Willingham,Cambridge

出　　处：《Journal of Rare Earths》2012年第12期1298-1302,共5页稀土学报（英文版）

摘　　要：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 fotmd to enhance the pyocyanin pigment production in Pseudomonas aeruginosa.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 fotmd to enhance the pyocyanin pigment production in Pseudomonas aeruginosa.

关 键 词：lanthanum oxide： nanoparticles： bacterial toxicity： pyocyanin rare earths 

分 类 号：TB383.1[一般工业技术—材料科学与工程]