Photocatalytic antibacterial performance of TiO₂ and Ag-doped TiO₂ against S. aureus. P. aeruginosa and E. coli

• Kiran Gupta,
• R. P. Singh,
• Ashutosh Pandey and
• Anjana Pandey

Beilstein J. Nanotechnol. 2013, 4, 345–351, doi:10.3762/bjnano.4.40

• and transfer behaviour of the photoexcited electron–hole pairs in the semiconductors was recorded by photoluminescence. The antimicrobial activity of TiO2 and Ag-doped TiO2 nanoparticles (3% and 7%) was investigated against both gram positive (Staphylococcus aureus) and gram negative (Pseudomonas

• zero viability at 40 mg/30 mL culture in the case of P. aeruginosa only. Keywords: Ag-doped TiO2; antimicrobial activity; sol–gel; Introduction The photocatalytic agent TiO2, known for its chemical stability and optical competency, has been used extensively for killing different groups of

• photocatalytic efficiency [8][9]. However, silver nanoparticles have prospective applications including biosensing, biodiagnostics, optical fibers, and antimicrobial and photocatalytic uses. Silver ions are known to cause denaturation of proteins present in bacterial cell walls and slow down bacterial growth [5

Electrospinning preparation and electrical and biological properties of ferrocene/poly(vinylpyrrolidone) composite nanofibers

• Ji-Hong Chai and
• Qing-Sheng Wu

Beilstein J. Nanotechnol. 2013, 4, 189–197, doi:10.3762/bjnano.4.19

• PVP nanofibers. X-ray diffraction (XRD) results showed that the crystalline structure of Fc in the fibers was amorphous after the electrospinning process. A biological evaluation of the antimicrobial activity of Fc/PVP nanofibers was carried out by using Gram-negative Escherichia coli (E. coli) as

• agent. In the case of Fc/PVP nanofibers, water-soluble polymer PVP, as a carrier, not only provides good dispersion for Fc, but also can release Fc quickly upon encountering a small amount of water. The antimicrobial activity of composite Fc/PVP nanofibers is explored in this article. Common E.coli was

• counter electrode, and a saturated calomel electrode (SCE) as the reference electrode. Antimicrobial activity testing of Fc/PVP nanofibers The sample containing 45 wt % Fc was tested for antibacterial activity against the Gram-negative E. coli. Samples were prepared in the form of discs with a diameter of

Paper modified with ZnO nanorods – antimicrobial studies

• Mayuree Jaisai,
• Sunandan Baruah and
• Joydeep Dutta

Beilstein J. Nanotechnol. 2012, 3, 684–691, doi:10.3762/bjnano.3.78

• , Postal Code 123, Al Khoud, Oman 10.3762/bjnano.3.78 Abstract Paper with antimicrobial properties was developed through in situ growth of ZnO nanorods. The targeted application for this type of paper is in health centers as wallpaper, writing paper, facemasks, tissue paper, etc. The paper was tested on

• three model microbes, Gram-positive bacteria Staphylococcus aureus, Gram-negative bacteria Escherichia coli and common airborne fungus Aspergillus niger. No viable bacterial colonies or fungal spores could be detected in the areas surrounding test samples of the antimicrobial paper. Gram-negative

• the paper samples are 102% and 70%, and for Aspergillus niger, 224% and 183% of the sample area, under similar lighting conditions. Keywords: antimicrobial; nanorod; paper; photocatalysis; zinc oxide; Introduction Deterioration of library materials due to fungal growth is a worldwide problem and a