Abstract
Seven selected cyanobacterial species namely Nostoc linckia, Nostocmuscorum, Oscillatoria acuminata, Anabaena variables, Oscillatoriaamphigranulata, Spirulina platensis and Phormidium purpurascenswere cultivated on suitable media. In this work, the growth rates of weremeasured by optical density and dry weight, day after day. Spirulinaplatensis biomass was harvested at the 16th day which about equaled8.322 g/L dry biomass. Also the biomass of other selectedcyanobacterial species was collected at the 22nd day. The present workwas designed for the biosynthesis of AgNPs by seven cyanobacterialspecies using their filtrate and biomass separately. Appearance ofsurface plasmon band at 400 nm for filtrate and biomass indicated thebiosynthesis of AgNPs. UV-vis spectroscopy used to characterizebiosynthezied AgNPs and resulted in appearance of surface plasmonband at 400 nm for filtrate and biomass
Highlights
IntroductionCyanobacteria “blue green algae" are a division, that descending from algae
Cyanobacteria “blue green algae" are a division, that descending from algae.They are considered to be the only known oxygen photobacteria prokaryotes
Cyanobacterial genera of Nostoc, Anabaena, Oscillatoria and Microcystis are considered to be a promising microalgae designed for the production of many bioactive natural products because they provide a wide range of secondary metabolites (Singh et al, 2017)
Summary
Cyanobacteria “blue green algae" are a division, that descending from algae. They are considered to be the only known oxygen photobacteria prokaryotes. The variety and physiology of these cyanobacteria have acquired great interest in the last few years because they considered a rich source of many bioactive compounds which serves as a brilliant base for discovering their applications in the field of biotechnology (Sinia et al, 2018; Kannaujiya et al, 2018). Nanotechnology opens new applications in several fields including manufacturing, medicine, material science and numerous technologies (El-Sheekh and El-Kassas, 2016). Silver nanoparticles (AgNPs) have proved to be the most effective against large variety of organisms including cyanobacteria (Ahmed et al, 2015). The present work aims to the green synthesis of AgNPs from the selected cyanobacteria species filtrate and biomass for possible use as commercial products
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