Abstract
The present investigation demonstrates the formation of silver nanoparticles by the reduction of the aqueous silver metal ions during exposure to the seaweed (Chaetomorpha linum) extract. The silver nanoparticles obtained were characterized by UV–visible spectrum, FTIR and scanning electron microscopy. The characteristic absorption peak at 422 nm in UV–vis spectrum confirmed the formation of silver nanoparticles. The colour intensity at 422 nm increased with duration of incubation. The size of nanoparticles synthesized varied from 3 to 44 nm with average of ~30 nm. The FTIR spectrum of C. linum extract showed peaks at 1,020, 1,112, 1,325, 1,512, 1,535, 1,610, 1,725, 1,862, 2,924, 3,330 cm−1. The vibrational bands corresponding to the bonds such as –C=C (ring), –C–O, –C–O–C and C=C (chain) are derived from water-soluble compounds such as amines, peptides, flavonoids and terpenoids present in C. linum extract. Hence, it may be inferred that these biomolecules are responsible for capping and efficient stabilization. Since no synthetic reagents were used in this investigation, it is environmentally safe and have potential for application in biomedicine and agriculture.
Highlights
Silver nanoparticles (AgNPs) are widely investigated to owing their broad range of applications as antibacterials (Venkatpurwar and Pokharkar 2011; Wang Yh et al 2008), biosensors (Chen et al 2007) and in plant growth metabolism (Krishnaraj et al 2012)
The present investigation demonstrates the formation of silver nanoparticles by the reduction of the aqueous silver metal ions during exposure to the seaweed (Chaetomorpha linum) extract
The vibrational bands corresponding to the bonds such as –C=C, –C–O, –C–O–C and C=C are derived from watersoluble compounds such as amines, peptides, flavonoids and terpenoids present in C. linum extract
Summary
Silver nanoparticles (AgNPs) are widely investigated to owing their broad range of applications as antibacterials (Venkatpurwar and Pokharkar 2011; Wang Yh et al 2008), biosensors (Chen et al 2007) and in plant growth metabolism (Krishnaraj et al 2012). AgNPs have been successfully synthesized using several plant extracts (Shankar et al 2003; Amkamwar et al 2005; Chandran et al 2006; Li et al 2007; Venkatpurwar and Pokharkar 2011). All these investigations are restricted to terrestrial plants, but only limited reports are available for synthesis of nanoparticles from marine plants (Govindaraju et al 2009; Nabikhan et al 2010; Venkatpurwar and Pokharkar 2011). Many researchers (Heo et al 2005; Patra et al 2009; Prabhahar et al 2011) have reported that C. linum exhibits medicinal properties with high-value phytochemicals, which motivated us to carry out the present investigation on the synthesis of AgNPs using C. linum biomass
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