Abstract
We present the synthesis and antibacterial activity of silver nanoparticles using Caulerpa racemosa ,a marine algae. Fresh C. racemosa was collected from the Gulf of Mannar, Southeast coast of India. The seaweed extract was used for the synthesis of AgNO3 at room temperature. UV-visible spectrometry study revealed sur- face plasmon resonance at 413 nm. The characterization of silver nanoparticle was carried out using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and transmission electron microscope (TEM). FT-IR measurements revealed the possible functional groups responsible for reduction and stabilization of the nanopar- ticles. X-ray diffraction analysis showed that the particles were crystalline in nature with face-centered cubic geom- etry.TEM micrograph has shown the formation of silver nanoparticles with the size in the range of 5-25 nm. The synthesized AgNPs have shown the best antibacterial activity against human pathogens such as Staphylococcus aureus and Proteus mirabilis. The above eco-friendly synthesis procedure of AgNPs could be easily scaled up in future for the industrial and therapeutic needs.
Highlights
Pathogenic bacteria are playing an important role in the creation of unknown diseases and the development of antibiotic resistance which are the major problems in the current scenario
We present the synthesis and antibacterial activity of silver nanoparticles using Caulerpa racemosa, a marine algae
The characterization of silver nanoparticle was carried out using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and transmission electron microscope (TEM)
Summary
Pathogenic bacteria are playing an important role in the creation of unknown diseases and the development of antibiotic resistance which are the major problems in the current scenario. Nanoparticles of metals are the most potential agents as they show excellent antibacterial activities due to their large surface area-to-volume ratio, which is getting up as the current interest in the researchers due to the growing microbial resistance against metal ions, antibiotics and the growth of resistant strains (Gong et al 2007). Physical and chemical synthesis methods, aimed at controlling the physical properties of the particles are mostly employed for the production of metal nanoparticles. In the biosynthesis of nanoparticles, biological organisms like bacteria, fungi, actinomycetes, yeast, algae and plants were utilized as reducing agent or protective agents (Kaushik et al 2010; Huh 2011). We report the synthesis of AgNPs with sizes in the range of 10 nm using (Green algae) Caulerpa racemosa extract and assessed their antagonistic effect against gram-positive and gram-negative bacteria
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