Comparison of the antibacterial activity against Escherichia coli of silver nanoparticle produced by chemical synthesis with biosynthesis
Journal Title: Materials Science: Materials Review - Year 2018, Vol 2, Issue 2
Abstract
The synthesis of silver nanoparticles (Ag NPs) has been carried out using different methods, mainly by biological and chemical methods; however, comparing antibacterial activity of Ag NPs synthesized by these methods has not been conducted before. In this study, silver nanoparticles (Ag NPs) were synthesized by methods using reducing agent NaBH4/carboxymethyl cellulose (CMC) and fungal strain Trichoderma asperellum (T.asperellum). The formation of silver nanoparticles was observed visually by color change and identified by Ultraviolet-visible (UV – vis) spectroscopy. The transmission electron microscopy (TEM) image illustrated almost nanoparticles with spherical shape and average diameter of 4.1 ± 0.2 nm and 2.1 ± 0.2 nm of samples produced from chemical reduction and biosynthesis respectively. Both samples after 180 days storing have been separated lightly, but the agglomeration and absorbance peak shifting were not observed which proved the high stability of synthesized Ag NPs. Antimicrobial activity against human bacterial pathogen Escherichia coli (E. coli) showed that the inhibition zone produced by “biosynthesis” and “chemical reduction” Ag NPs were 3.17 cm and 2.42 cm respectively. With nanoparticles size smaller than 2 mm, antibacterial activity of “biosynthesis” Ag NPs against E. coli was 31 % higher than “chemical reduction” Ag NPs, although the concentration of Ag NPs produced by biosynthesis was about 10-fold less.
Authors and Affiliations
Nguyen Phuc Quan, Tran Quoc Vinh, Kieu Thi My Yen, Le Vu Khanh Trang, Nguyen Minh Ly, Tran Cong Khanh
Keywords
Related Articles
- EP ID EP679036
- DOI -
- Views 230
- Downloads 0
Quasi-particle Contribution in Thermal Expansion and Thermal Conductivity in Metals
In this paper the modified Landau theory of Fermi Liquids was used to compute the thermal expansion and thermal conductivity of quasi-particles in metals. The result revealed that as temperature increases the thermal exp...
Photovoltaic power generation system
The potential crisis of energy and the deterioration of ecological environment make the world's cumbersome development of renewable energy including new energy, including solar energy. Traditional energy in the coal, oil...
Study of Formation of Oxide Nanostructures on the Surface of Radiation-oxidated Aluminum
Reflection IR spectroscopy, atomic force microscopy (AGM), and electrophysical measurements were used to investigate the formation of surface oxide nanostructures during the radiation oxidation of metallic aluminum in co...
Behavior of Cast {TI or Ta}-Containing Alloys Based on Nickel and/or Cobalt in High Temperature Oxidation: Effect of the Ni/Co Ratio
Many of the cast superalloys chosen for specific applications at high temperatures, such as tools devoted for shaping molten glass, are based on nickel or cobalt. They contain chromium and carbon to achieve good resistan...
Cooling Rate, Hardness and Microstructure of Aluminum Cast Alloys
This experiment investigated the cooling curve behavior, hardness and microstructure of two aluminum alloys produced by casting process. There are Al-1.37Zn-1.19Si and Al-1.66Si-1.35Zn derived from melting and alloying a...