Comparison of the antibacterial activity against Escherichia coli of silver nanoparticle produced by chemical synthesis with biosynthesis
Journal: Materials Science: Materials Review (Vol.2, No. 2)Publication Date: 2018-06-30
Authors : Nguyen Phuc Quan Tran Quoc Vinh Kieu Thi My Yen Le Vu Khanh Trang Nguyen Minh Ly Tran Cong Khanh;
Page : 1-8
Keywords : Silver nanoparticles; Trichoderma asperellum; Carboxymethyl cellulose; Antibacterial activity; Plasmon surface;
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.
Other Latest Articles
- Optimization of laser cladding process for additive repair of high temperature and high pressure valve sealing surface
- Study on the influence of the springback on the hole expansion ratio characterization
- Cooling Rate, Hardness and Microstructure of Aluminum Cast Alloys
- Functional Approach to Development of Hybrid Technology of Cutting Diamond Carbides
Last modified: 2020-03-11 12:00:55