Biosynthesis of silver nanoparticles by a new strain of Streptomyces sp compared with Aspergillus fumigatus

被引:54
作者
Alani, Faiez [2 ]
Moo-Young, Murray [1 ]
Anderson, William [1 ]
机构
[1] Univ Waterloo, Dept Chem Engn, Waterloo, ON N2L 3G1, Canada
[2] McMaster Univ, Biotechnol Program, Hamilton, ON, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
Silver nanoparticles; In vitro biosynthesis; Industrial filamentous organisms; Cell-free biosynthesis; BIOLOGICAL SYNTHESIS; BACTERIA;
D O I
10.1007/s11274-011-0906-0
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
Locally isolated strains of a thermoalkalotolerant Streptomyces sp. and Aspergillus fumigatus were used for the in vitro biosynthesis of silver nanoparticles from AgNO3 solutions. An autolysed cell-free culture filtrate from each strain was used, indicating that the formation mechanism depends on intra-cellular components for both organisms, since culture broths had no significant nanoparticle formation potential. Nanoparticle formation was indicated by a change of the solution from colourless or light brown to dark brown after 24 h or more, and UV-visible spectroscopy and x-ray diffraction analysis confirmed the formation by both organisms. The initial formation kinetics were faster with Aspergillus, but formation continued for a longer period with Streptomyces, resulting in higher concentrations after 48 h. Transmission electron microscope images revealed well dispersed nanoparticles with diameters ranging from 15 to 45 nm from A. fumigatus, while those from Streptomyces sp. had a narrower size distribution of 15-25 nm. The higher productivity and preferred narrower size distribution of Streptomyces, together with its well established industrial use, may make it the preferred choice for further optimization studies.
引用
收藏
页码:1081 / 1086
页数:6
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