Preparation and high bacteriostatic action of the activated carbons possessing ultrafine silver particles |
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| Affiliation: | 1. Pathology & Dermatology, Hematopathology and Dermatopathology Sections, University of Virginia, Charlottesville, VA, USA;2. Hematopathology, National Cancer Institute (NCI), Bethesda, MD, USA;1. Department of Physics, Tilak Bhavan, Vidyanagari, Kalina Campus, Santacruz (E), Mumbai 400098, India;2. Food and Nutrition Department, Bhabha Atomic Research Center, Trombay, Mumbai 400085, India;3. EBPS, RTDD, BRIT/BARC complex, Sector 20, Navi Mumbai 400703, India;1. College of Fisheries, Guangdong Ocean University, Zhanjiang, 524025, China;2. Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animals & Key Laboratory of Control for Diseases of Aquatic Economic Animals of Guangdong Higher Education Institute, Zhanjiang, China;3. College of Marine Sciences, South China Agricultural University, Guangzhou, 510642, China;4. Aquatic Species Introduction and Breeding Center of Guangxi Zhuang Autonomous Region, Nanning, 530031, China |
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| Abstract: | The new carbon composites possessing ultrafine silver particles (0.001 wt%, size 1.8–2.5 nm) show high bacteriostatic action toward bacteria such as Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus and Bacillus subtilis and a yeast fungus like Candida albicans. The present carbon composite was prepared by the steam activation of a mixture of a petroleum pitch and N,N-dimethylaminomethylphenylsilver (0.012 mg/g) at 930 °C for 15–19 min. The growth inhibitory effect for Gram-negative bacteria such as E. coli and P. aeruginosa varies greatly depending on the amount of ultrafine silver particles, while the Gram-positive bacteria show little effect by the amount of silver particles used. A yeast fungus like C. albicans exhibits relatively small biostatic action as compared with bacteria, but it shows enough activity when we used the carbon material possessing 0.01 wt% of Ag particles. |
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