Surface plasmon resonance optical sensor and antibacterial activities of biosynthesized silver nanoparticles

• Green synthesis of Ag nanoparticles using Ananas comosus fruit extract as reducing agent.
• Stable and spherical Ag nanoparticles were prepared.
• Shows size dependent antimicrobial activity.
• Act as very good copper and zinc sensors.

Silver nanoparticles were prepared using aqueous fruit extract of Ananas comosus as reducing agent. These silver nanoparticles showed surface plasmon peak at 439 nm. They were monodispersed and spherical in shape with an average particle size of 10 nm. The crystallinity of these nanoparticles was evident from clear lattice fringes in the HRTEM images and bright circular spots in the SAED pattern. The antibacterial activities of prepared nanoparticles were found to be size-dependent, the smaller nanoparticles showing more bactericidal effect. Aqueous Zn2+ and Cu4+ selectivity and sensitivity study of this green synthesized nanoparticle was performed by optical sensor based surface plasmon resonance (SPR) at room temperature.

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