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The presence of various phytochemicals makes the leaf extract-based green synthesis advantageous to other conventional methods, as it facilitates the production of non-toxic by-product. In the present study, leaf extracts from two different plants:  Aloe barbadensis miller  and  Ocimum tenuiflorum , were used to synthesise Ag nanoparticles. The absorbance at 419-432 nm from UV-visible spectroscopy indicates the formation of Ag in the synthesised samples. The effect of precursors’ concentration on the stability, size and shape of the synthesised samples has also been investigated at constant heating temperature, stirring time, and the pH of the solution. The TEM results showed that all the synthesised samples of nanoparticles demonstrated stability with a size range of 7-70 and 9-48 nm with  Aloe barbadensis miller  and  Ocimum tenuiflorum  leaf extracts, respectively. The formation of smaller Ag nanoparticles due to utilisation of different precursor concentration and leaf extracts was also explained. The synthesised samples’ anti-bacterial activity was examined against the pathogens,  Bacillus subtilis ,  Staphylococcus aureus , and  Escherichia coli . In general, the green synthesis approach established a prospective for developing highly stable Ag nanoparticles with rigid particle shape/size distribution from different leaf extracts for the development of better anti-bacterial agents.

nanofabrication

Green synthesis of silver nanoparticles and evaluation of their anti-bacterial activities: use of  Aloe barbadensis miller  and  Ocimum tenuiflorum  leaf extracts