Abstract
In this work, we report a green method for the synthesis of gold nanoparticles (GNP) using the aqueous extract of red tomato (Lycopersicon esculentum). We believe that citric acid and ascorbic acid present in tomato juice are responsible for the reduction of gold ions. This biosynthesized GNP in the presence of sodium dodecyl sulfate has been used as a colorimetric sensor to detect and estimate the pesticide, methyl parathion. The GNP in the presence of methyl parathion shows a new peak at 400 nm due to the formation of 4-nitrophenolate ion by catalytic hydrolysis of methyl parathion in alkaline medium. A calibration curve between the absorption coefficients of the 400-nm peak versus the concentration of the pesticide allows the quantitative estimation of the 4-nitrophenolate ion, thereby enabling indirect estimation of methyl parathion present in the system.
Highlights
The last 2 decades have witnessed rapid advancement in various technologies for the fabrication of nanoparticles
We report a green method for the synthesis of gold nanoparticles (GNP) using the aqueous extract of red tomato (Lycopersicon esculentum)
A green method has been used for the synthesis of gold nanoparticles using the aqueous extract of red tomato
Summary
The last 2 decades have witnessed rapid advancement in various technologies for the fabrication of nanoparticles. Among the various classes of nanoparticles, metal nanoparticles are receiving much attention due to their application in various fields of science and technology. A number of approaches are available for the synthesis of silver and gold nanoparticles, for example, reduction of solution [1,2,3]; thermal [4], electrochemical [5], and sonochemical decomposition [6]; microwave-assisted synthesis [7]; and recently, using of green chemistry [8,9,10,11]. Using plants in the biosynthesis of metal nanoparticles, especially gold and silver nanoparticles, has received more attention as suitable alternative to chemical procedures and physical methods. Bioreduction of metal nanoparticles using a combination of biomolecules found in plant extract, e.g., enzymes, proteins, amino acids, vitamins, polysaccharides, and organic acids such as citrates is environmentally benign yet chemically complex. Gardea-Torresdey et al [12,13]
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