Bio-functionalized silver nanoparticles for selective colorimetric sensing of toxic metal ions and antimicrobial studies.
Hibiscus Sabdariffa (Gongura) plant extracts (leaves (HL) and stem (HS)) were used for the first time in the green synthesis of bio-functionalized silver nanoparticles (AgNPs). The bio-functionality of AgNPs has been successfully utilized for selective colorimetric sensing of potentially health and environmentally hazardous Hg(2+), Cd(2+) and Pb(2+) metal ions at ppm level in aqueous solution. Importantly, clearly distinguishable colour for all three metal ions was observed. The influence of extract preparation condition and pH were also explored on the formation of AgNPs. Both selectivity and sensitivity differed for AgNPs synthesized from different parts of the plant. Direct correlation between the stability of green synthesized AgNPs at different pH and its antibacterial effects has been established. The selective colorimetric sensing of toxic metal ions and antimicrobial effect of green synthesized AgNPs demonstrated the multifunctional applications of green nanotechnology.
School of Chemical & Biotechnology, SASTRA University, Thanjavur 613401, Tamil Nadu, India.
V
V
Vinod Kumar
School of Chemical & Biotechnology, SASTRA University, Thanjavur 613401, Tamil Nadu, India.
S
S
Anbarasan
School of Chemical & Biotechnology, SASTRA University, Thanjavur 613401, Tamil Nadu, India.
Lawrence Rene
LR
Christena
School of Chemical & Biotechnology, SASTRA University, Thanjavur 613401, Tamil Nadu, India.
Nagarajan
N
SaiSubramanian
School of Chemical & Biotechnology, SASTRA University, Thanjavur 613401, Tamil Nadu, India. Electronic address: philip@biotech.sastra.edu.
Savarimuthu
S
Philip Anthony
D000890:Anti-Infective Agents / Q000737:chemistry* / Q000494:pharmacology; D002104:Cadmium / Q000032:analysis*; D002412:Cations / Q000032:analysis; D003124:Colorimetry / Q000379:methods; D004926:Escherichia coli / Q000187:drug effects; D004927:Escherichia coli Infections / Q000188:drug therapy; D055772:Green Chemistry Technology / Q000379:methods; D031584:Hibiscus / Q000737:chemistry; D006801:Humans; D007854:Lead / Q000032:analysis*; D008628:Mercury / Q000032:analysis*; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D010936:Plant Extracts / Q000737:chemistry; D012834:Silver / Q000737:chemistry* / Q000494:pharmacology
D000890:Anti-Infective Agents; D002412:Cations; D010936:Plant Extracts; D002104:Cadmium; D007854:Lead; D012834:Silver; D008628:Mercury
AgNPs colorimetric sensor; Biosynthesis of AgNPs; Cd(2+) sensor; Pb(2+) sensor