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Green synthesis and structural characterization of selenium nanoparticles and assessment of their antimicrobial property

机译：硒纳米粒子的绿色合成，结构表征及抗菌性能评估

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摘要

In the present study, selenium nanoparticles were biologically synthesized by non-pathogenic, economic and easy to handle bacterium Ralstonia eutropha. The selenium oxo anion was reduced to selenium nanoparticles in the presence of the bacterium. The bacterium was grown aerobically in the reaction mixture. An extracellular, stable, uniform, spherical selenium nanoparticle was biosynthesized. The TEM analysis revealed that the biosynthesized selenium nanoparticles were spherical in shape with size range of 40-120 nm. XRD and SAED analysis showed that nanocrystalline selenium of pure hexagonal phase was synthesized. The formation of actinomorphic trigonal selenium nanorods was also observed. A mechanism of biosynthesis of selenium nanoparticles by R. eutropha was proposed. The biosynthesized selenium nanoparticles were investigated for their antimicrobial activity against potential pathogens. Selenium nanoparticles showed excellent antimicrobial activity. The 100, 100, 250 and 100 A mu g/ml selenium nanoparticles were found to inhibit 99 % growth of Pseudomonas aeruginosa, Staphylococcus aureus, Escherichia coli and Streptococcus pyogenes, respectively. Similarly, the 500 A mu g/ml of selenium nanoparticles was found to inhibit the growth of pathogenic fungi Aspergillus clavatus. The antimicrobial efficacy of selenium nanoparticle was comparable with commercially available antibiotic drug Ampicillin.
机译：在本研究中，硒纳米粒子是通过非致病性，经济且易于处理的富营养性罗氏菌而生物合成的。在细菌存在下，硒代含氧阴离子被还原为硒纳米颗粒。细菌在反应混合物中需氧生长。生物合成了一种细胞外，稳定，均匀的球形硒纳米颗粒。 TEM分析显示，生物合成的硒纳米颗粒呈球形，大小范围为40-120 nm。 XRD和SAED分析表明，合成了纯六方相纳米晶硒。还观察到光化形态的三角形硒纳米棒的形成。提出了富营养红景天生物合成硒纳米颗粒的机理。研究了生物合成的硒纳米颗粒对潜在病原体的抗菌活性。硒纳米颗粒具有出色的抗菌活性。发现100、100、250、100和100 Aμg / ml的硒纳米颗粒分别抑制铜绿假单胞菌，金黄色葡萄球菌，大肠杆菌和化脓链球菌的99％生长。同样，发现500 Aμg / ml的硒纳米颗粒可抑制致病性真菌曲霉曲霉的生长。硒纳米颗粒的抗菌功效与市售抗生素药物氨苄西林相当。

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