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Bacterial Compatibility/Toxicity of Biogenic Silica (b-SiO2) Nanoparticles Synthesized from Biomass Rice Husk Ash

1
Department of Physics, C.C.S. University, Meerut Campus, Meerut UP 250004, India
2
Institute for Skeletal Ageing & Orthopedic Surgery, Hallym University-Chuncheon Sacred Heart Hospital, Chuncheon, Gangwon-Do 24253, Korea
3
Division of Physics and Semiconductor Science, Dongguk University-Seoul, Seoul 04620, Korea
4
Institute of Biotechnology, Amity University, Raipur, Chhattisgarh 493225, India
*
Authors to whom correspondence should be addressed.
Nanomaterials 2019, 9(10), 1440; https://doi.org/10.3390/nano9101440 (registering DOI)
Received: 28 July 2019 / Revised: 25 September 2019 / Accepted: 2 October 2019 / Published: 11 October 2019
(This article belongs to the Special Issue Antibacterial Activity of Nanoparticles)
Biogenic silica (b-SiO2) nanopowders from rice husk ash (RHA) were prepared by chemical method and their bacterial compatibility/toxicity was analyzed. The X-ray diffractometry (XRD) patterns of the b-SiO2 nanopowders indicated an amorphous feature due to the absence of any sharp peaks. Micrographs of the b-SiO2 revealed that sticky RHA synthesized SiO2 nanopowder (S1) had clustered spherical nanoparticles (70 nm diameter), while b-SiO2 nanopowder synthesized from red RHA (S2) and b-SiO2 nanopowder synthesized from brown RHA (S3) were purely spherical (20 nm and 10 nm diameter, respectively). Compared to the S1 (11.36 m2g−1) and S2 (234.93 m2g−1) nanopowders, the S3 nanopowders showed the highest surface area (280.16 m2g−1) due to the small particle size and high porosity. The core level of the X-ray photoelectron spectroscopy (XPS) spectra showed that Si was constituted by two components, Si 2p (102.2 eV) and Si 2s (153.8 eV), while Oxygen 1s was observed at 531.8 eV, confirming the formation of SiO2. The anti-bacterial activity of the b-SiO2 nanopowders was investigated using both gram-positive (Escherichia coli) and gram-negative (Staphylococcus aureus) microorganisms. Compared to S2 and S3 silica nanopowders, S1 demonstrated enhanced antibacterial activity. This study signifies the medical, biomedical, clinical, and biological importance and application of RHA-mediated synthesized b-SiO2. View Full-Text
Keywords: biogenic silica (b-SiO2); microstructural analysis; bacterial compatibility; anti-bacterial; E. coli; S. aureus biogenic silica (b-SiO2); microstructural analysis; bacterial compatibility; anti-bacterial; E. coli; S. aureus
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MDPI and ACS Style

Sharma, S.K.; Sharma, A.R.; Pamidimarri, S.D.V.N.; Gaur, J.; Singh, B.P.; Sekar, S.; Kim, D.Y.; Lee, S.S. Bacterial Compatibility/Toxicity of Biogenic Silica (b-SiO2) Nanoparticles Synthesized from Biomass Rice Husk Ash. Nanomaterials 2019, 9, 1440.

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