Antimicrobial activity of silica coated silicon nano-tubes (SCSNT) and silica coated silicon nano-particles (SCSNP) synthesized by gas phase condensation

作者：Tank Chiti; Raman Sujatha; Karan Sujoy; Gosavi Suresh; Lalla Niranjan P; Sathe Vasant; Berndt Richard; Gade W N; Bhoraskar S V; Mathe Vikas L^*

来源：Journal of Materials Science: Materials in Medicine , 2013, 24(6): 1483-1490.

DOI：10.1007/s10856-013-4896-3

Silica-coated, silicon nanotubes (SCSNTs) and silica-coated, silicon nanoparticles (SCSNPs) have been synthesized by catalyst-free single-step gas phase condensation using the arc plasma process. Transmission electron microscopy and scanning tunneling microscopy showed that SCSNTs exhibited a wall thickness of less than 1 nm, with an average diameter of 14 nm and a length of several 100 nm. Both nano-structures had a high specific surface area. The present study has demonstrated cheaper, resistance-free and effective antibacterial activity in silica-coated silicon nano-structures, each for two Gram-positive and Gram-negative bacteria. The minimum inhibitory concentration (MIC) was estimated, using the optical densitometric technique, and by determining colony-forming units. The MIC was found to range in the order of micrograms, which is comparable to the reported MIC of metal oxides for these bacteria. SCSNTs were found to be more effective in limiting the growth of multidrug-resistant Staphylococcus aureus over SCSNPs at 10 mu g/ml (IC 50 = 100 mu g/ml).

• 出版日期2013-6