Antibacterial activity of boron-doped TiO2(B/TiO2) nano-materials under visible light irradiation and in the dark was investigated. A simple sol-gel method was used to synthesize TiO2 nano-materials. X-ray diffraction...Antibacterial activity of boron-doped TiO2(B/TiO2) nano-materials under visible light irradiation and in the dark was investigated. A simple sol-gel method was used to synthesize TiO2 nano-materials. X-ray diffraction pattern of B/TiO2 nano-materials represents the diffraction peaks relating to the crystal planes of TiO2(anatase and rutile). X-ray photoelectron spectroscopy result shows that part of boron ions incorporates into TiO2 lattice to form a possible chemical environment like Ti O B and the rest exist in the form of B2O3. The study on antibacterial effect of B/TiO2 nano-materials on fungal Candida albicans(ATCC10231), Gram-negative Escherichia coli(ATCC25922) and Gram-positive Staphylococcus aureus(ATCC6538) shows that the antibacterial action is more significant on Candida albicans than on Escherichia coli and Staphylococcus aureus. Under visible light irradiation, the antibacterial activity is superior to that in the dark.展开更多
[Objective] To explore the optimal conditions for extracting polysaccharide from Auricularia auricular, and to study its physiochemical properties and antibacterial activities. [ Method] The extraction conditions for ...[Objective] To explore the optimal conditions for extracting polysaccharide from Auricularia auricular, and to study its physiochemical properties and antibacterial activities. [ Method] The extraction conditions for Auricularia auricular polysaccharides were optimized by orthogonal test, and its physiochemical characteristics and antagonistic activities on bacteria and molds were tested. I-Result] The optimized condition was with sample to liquid ratio of 1 ： 50, temperature of 90 ℃ and extraction time of 2.5 h. Under the optimized condition, the yield of pelysaccharide was 7.3%, with polysaccharide content of 77.81%. Containing aldose and amylase, the polysaccharides of Auncu/aria auricular was soluble in water. The inhibitory effect on bacteria was significantly stronger than on molds that the minimum diameter of inhibition zone for bacteria is 12.7 mm, while 7.9 mm for the molds. [ Conclusion] This study provides scientific basis for the development and utilization of Auricularia auricular polysaccharides.展开更多
Several kinds of activated carbon fibers, using sisal fiber as precursors, were prepared with steam activation or with ZnCl2 activation. Zinc or its compounds were dispersed in them. The antibacterial activities of th...Several kinds of activated carbon fibers, using sisal fiber as precursors, were prepared with steam activation or with ZnCl2 activation. Zinc or its compounds were dispersed in them. The antibacterial activities of these activated carbon fibers were determined and compared. The research results showed that these sisal based activated carbon fibers supporting zinc have stronger antibacterial activity against Escherichia coli and S. aureus. The antibacterial activity is related to the precursors, the pyrolysis temperature, and the zinc content. In addition, small quantity of silver supported on zinc-containing ACFs will greatly enhance the antibacterial activity of ACFs.展开更多
基金Supported by the National Natural Science Foundation of China(51090384)
文摘Antibacterial activity of boron-doped TiO2(B/TiO2) nano-materials under visible light irradiation and in the dark was investigated. A simple sol-gel method was used to synthesize TiO2 nano-materials. X-ray diffraction pattern of B/TiO2 nano-materials represents the diffraction peaks relating to the crystal planes of TiO2(anatase and rutile). X-ray photoelectron spectroscopy result shows that part of boron ions incorporates into TiO2 lattice to form a possible chemical environment like Ti O B and the rest exist in the form of B2O3. The study on antibacterial effect of B/TiO2 nano-materials on fungal Candida albicans(ATCC10231), Gram-negative Escherichia coli(ATCC25922) and Gram-positive Staphylococcus aureus(ATCC6538) shows that the antibacterial action is more significant on Candida albicans than on Escherichia coli and Staphylococcus aureus. Under visible light irradiation, the antibacterial activity is superior to that in the dark.
文摘[Objective] To explore the optimal conditions for extracting polysaccharide from Auricularia auricular, and to study its physiochemical properties and antibacterial activities. [ Method] The extraction conditions for Auricularia auricular polysaccharides were optimized by orthogonal test, and its physiochemical characteristics and antagonistic activities on bacteria and molds were tested. I-Result] The optimized condition was with sample to liquid ratio of 1 ： 50, temperature of 90 ℃ and extraction time of 2.5 h. Under the optimized condition, the yield of pelysaccharide was 7.3%, with polysaccharide content of 77.81%. Containing aldose and amylase, the polysaccharides of Auncu/aria auricular was soluble in water. The inhibitory effect on bacteria was significantly stronger than on molds that the minimum diameter of inhibition zone for bacteria is 12.7 mm, while 7.9 mm for the molds. [ Conclusion] This study provides scientific basis for the development and utilization of Auricularia auricular polysaccharides.
基金Key-program foundation from Guangzhou Science & Technology Committee (1999-J-013-01)
文摘Several kinds of activated carbon fibers, using sisal fiber as precursors, were prepared with steam activation or with ZnCl2 activation. Zinc or its compounds were dispersed in them. The antibacterial activities of these activated carbon fibers were determined and compared. The research results showed that these sisal based activated carbon fibers supporting zinc have stronger antibacterial activity against Escherichia coli and S. aureus. The antibacterial activity is related to the precursors, the pyrolysis temperature, and the zinc content. In addition, small quantity of silver supported on zinc-containing ACFs will greatly enhance the antibacterial activity of ACFs.
