Mahdi Mohseniazar
1, Mohsen Barin
2, Habib Zarredar
3, Siamak Alizadeh
4, Dariush Shanehbandi
5*1 Department of Horticulture, Faculty of Agriculture, Urmia University, Urmia, Iran
2 Department of Soil Science, Faculty of Agriculture, Urmia University, Urmia, Iran
3 Department of Microbiology, Faculty of Science, Islamic Azad University of Lahijan, Lahijan, Iran
4 Department of Microbiology, Ahar Branch, Islamic Azad University, Ahar, Iran
5 Department of Biotechnology, Faculty of Agriculture, Payame Noor University of Tehran, Karaj, Iran
Abstract
Introduction:
Application of nanoparticles has been extensively increased in last
decades. Nanoparticles of noble metals such as gold, platinum and
especially silver are widely applied in medical and pharmaceutical
applications. Although, variety of physical
and chemical methods has been developed for production of metal
nanoparticles, because of destructive effects of them on environment,
biosynthetic methods have been suggested as a novel alternative. Some
bacteria and microalgae have different ranges of potentiality to uptake
metal ions and produce nanoparticles during detoxification process. In the present work, we study the potential of three Lactobacilli and three algal species in production of AgNPs in different concentrations of silver nitrate. Methods: Utilizing AAS, XRD and TEM methods, Nannochloropsis oculata, Dunaliella salina and Chlorella vulgaris as three algal species in addition to three Lactobacilli including L. acidophilus, L. casei, L. reuteri were
monitored for production of silver nanoparticles. Three concentrations
of AgNO3 (0.001, 0.002, 0.005 M) and two incubation times (24h and 48h)
were included in this study. Results: Our findings demonstrated that C. vulgaris, N. oculata and L. acidophilus have the potential of nanosilver production in a culture medium containing 0.001 M of AgNO3 within 24 hours. Also L. casei and L. reuteri species exhibited their potential for production of silver nanoparticles in 0.002 M concentration of AgNO3 in
24 hours. The size range of particles was approximately less than 15
nm. The uptake rate of silver in the five species was between 1.0 to 2.7
mg/g of dry weight. Nanoparticle production was not detected in other
treatments and the algae Dunaliella. Conclusion: The biosynthesis of silver nanoparticles in all of three Lactobacilli and two algal species including N. oculata and C. vulgaris was confirmed.