Investigation on the Antibacterial Activity and Mechanism of C12A7-O- Particles

doi:10.3724/SP.J.1077.2010.00942

Abstract

Abstract:

The [Ca₂₄Al₂₈O₆₄]⁴⁺·4O^-(C12A7-O^-) particle was firstly investigated its antibacterial activity against bacteria E. Coli in aqueous solution and phosphate buffered saline (PBS). The C12A7-O^- particles were synthesized by gas-solid reaction method with CaCO₃ and γ-Al₂O₃ in a molar ratio of 12:7. The structure change of the C12A7-O^- particles was measured by X-ray diffraction (XRD) and electron spin resonance (ESR) after antibacterial test. The results show that the structure of the C12A7-O^- particles is completely changed into the structure of (CaO)₃Al₂O₃·6H₂O and Al(OH)₃. In the C12A7-O^- solution (1 mg/mL), the concentration of atomic oxygen anion (O^-) in the solution is 4×10¹⁶cm^-3. In the antibacterial test with the particle concentration of 3 mg/mL in aqueous solution, the bacteria concentration in decreased by 99.98% in 1 h from the original concentration of 10⁵cfu/mL. When the particle concentration is 1 mg/mL in PBS, the pH is 7.4 and the pH effect of the solution could be neglected, but the bacteria concentration still deduces to 3.7×10³ cfu/mL from the original concentration in 24 h. In briefly, O^- is the main factor in the antibacterial test in the C12A7-O^- PBS solution with the neutral pH environment.

Key words: C12A7, antibacterial activity, antibacterial mechanism

CLC Number:

TQ455

GONG Lu, SHEN Jing, LI Quan-Xin. Investigation on the Antibacterial Activity and Mechanism of C12A7-O^- Particles[J]. Journal of Inorganic Materials, 2010, 25(9): 942-946.

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Investigation on the Antibacterial Activity and Mechanism of C12A7-O^- Particles

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