Ascorbic acid functionalized gold nanoparticles as a probe for colorimetric and visual read-out determination of dichlorvos in environmental samples

D'souza, Stephanie L.; Pati, Ranjan K.; Kailasa, Suresh Kumar

doi:10.1039/c4ay01004c

Cited by 58 publications

(15 citation statements)

References 26 publications

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“…Being a reducing agent, the ascorbic acid donates an electron to Au(III) to form Au. For the reduction of Au(III), ascorbic acid interacts with Cl present in gold salt (HAuCl 4 ) and replaces it with the −OH group (present in furan ring) followed by deprotonation of another −OH group to form an intermediate complex of Au(I); the Au(I) ions were further reduced to Au, which led to the formation of AuNPs. , Thus, reduction of Au(III) occurred in two steps, that is, (1) reduction of Au(III) to Au(I) and (2) reduction of Au(I) to Au. It is worth to mention that the free −OH groups present on the aliphatic chain are responsible for negative surface zeta potential of ascorbate-AuNPs.…”

Section: Resultsmentioning

confidence: 99%

“…These groups helped ascorbic acid to readily form chelate complexes with multiple metals, that is, Cr, Co, Fe, Mn, and Cd (as shown in Figure S1). These complexes are reported to form a five-membered ring with the ene-diol region of the ascorbate. , Moreover, the relatively smaller size of ascorbate-AuNPs (8 nm) in comparison to other developed AuNPs can also play a crucial role in the interaction of AuNPs with multiple metal ions. The spatial interactions and probable binding sites on citrate, GSH, and ascorbate for Cr, Mn, and Cd are shown in Figures S2, S3, and S4, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Experimental and Computational Study on the Selective Interaction of Functionalized Gold Nanoparticles with Metal Ions: Sensing Prospects

et al. 2020

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Herein, we have developed citrate-, glutathione-, and ascorbate-functionalized gold nanoparticles (AuNPs) to examine their interactions with diverse heavy metal ions, such as Cd, Mn, Cr, Fe, Co, Pb, Hg, Zn, and Ti. These interactions are crucial in defining the final outcome of AuNP-based sensing/removal of heavy metals. We have evaluated these interactions by analyzing the variations in the color and spectroscopic signals of functionalized AuNPs. Additionally, the obtained results were also compared and validated with the computational studies. It has been observed that citrate-AuNPs and GSH-AuNPs displayed high selectivity toward Cr and Mn with E force values of −23.4 and −14.0 kJ/mol, respectively. Likewise, the ascorbate-AuNPs displayed sensitivity for multiple ions, for example, Cd, Fe, and Mn, with an E force value of −19.6 kJ/mol. A detailed analysis focusing on the electrostatic charges, ionic sizes, and interaction energy values has been provided to show specific interactions between functionalized AuNPs and heavy metal ions. The respective mechanisms of interaction between heavy metal ions and functionalized AuNPs have been explored with the help of experimental and computational outcomes.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Experimental and Computational Study on the Selective Interaction of Functionalized Gold Nanoparticles with Metal Ions: Sensing Prospects

et al. 2020

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“…One of the factors that influence the synthesis of gold nanoparticle is the concentration of HAuCl4 precursor. The higher concentration of HAuCl4 produced more gold nanoparticle, which could be indicated by the higher absorbance value [22]. The UV/Vis spectrophotometer measurement result (Fig.…”

Section: Synthesis Of Gold Nanoparticlesmentioning

confidence: 89%

Synthesis of Gold Nanoparticles Using <i>p</i>-Aminobenzoic Acid and <i>p</i>-Aminosalicylic Acid as Reducing Agent

2019

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Synthesis of gold nanoparticles (AuNPs) by reduction of HAuCl4 with p-aminobenzoic acid and p-aminosalicylic acid as a reducing agent was investigated. This work was conducted in order to determine the optimum condition of AuNPs synthesis and examine the effect of the hydroxyl group in p-aminosalicylic acid towards the size, shape, and stability of the synthesized gold nanoparticles (AuNPs). The optimum condition of the gold nanoparticles synthesis was determined by UV/Vis spectrophotometer, the shape and size of gold nanoparticles were measured by Transmission Electron Microscope (TEM). The synthesis process was started by reacting HAuCl4 and the reducing agents in an aqueous solution at 86 ºC. The initial gold concentration, reducing agents concentration and pH were varied in order to obtain the optimum condition. In the optimum condition, the results showed that p-aminosalicylic acid containing both hydroxyl and amino groups performed higher reduction ability compared to p-aminobenzoic acid that only containing an amino group. Reducing agents which have a hydroxyl group (p-aminosalicylic acid) could produce AuNPs with a smaller concentration of HAuCl4 than p-aminobenzoic acid. Gold nanoparticles that were synthesized with p-aminosalicylic acid were more stable and had a smaller particle size compared to its counterpart that is synthesized with p-aminobenzoic acid.

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“…In a study conducted by D'Souza and co-workers, ascorbic acid (AA) was used to cap AuNPs (AA-AuNPs) for dichlorvos in wheat samples and water (tap, river and canal), apple and wheat samples [78]. The presence of dichlorvos was observed to induce aggregation of AA-AuNPs through hydrogen-bonding formed, which result to broader wavelength (620 nm) and transition color from cherry red to purple.…”

Section: Chemical (Non-enzymatic) Based Assaysmentioning

confidence: 99%

A review on colorimetric methods for determination of organophosphate pesticides using gold and silver nanoparticles

et al. 2020

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This review (with 99 refs.) summarizes the progress that has been made in colorimetric (i.e. spectrophotometric) determination of organophosphate pesticides (OPPs) using gold and silver nanoparticles (NPs). Following an introduction into the field, a first large section covers the types and functions of organophosphate pesticides. Methods for colorimetric (spectrophotometric) measurements including RGB techniques are discussed next. A further section covers the characteristic features of gold and silver-based NPs. Syntheses and modifications of metal NPs are covered in section 5. This is followed by overviews on enzyme inhibition-based assays, aptamer-based assays and chemical (non-enzymatic) assays, and a discussion of specific features of colorimetric assays. Several Tables are presented that give an overview on the wealth of methods and materials. A concluding section addresses current challenges and discusses potential future trends and opportunities.

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Ascorbic acid functionalized gold nanoparticles as a probe for colorimetric and visual read-out determination of dichlorvos in environmental samples

Abstract: Schematic representation of the analytical process for detecting dichlorvos using AA–Au NPs as a colorimetric probe.

Cited by 58 publications

References 26 publications

Experimental and Computational Study on the Selective Interaction of Functionalized Gold Nanoparticles with Metal Ions: Sensing Prospects

Experimental and Computational Study on the Selective Interaction of Functionalized Gold Nanoparticles with Metal Ions: Sensing Prospects

Synthesis of Gold Nanoparticles Using <i>p</i>-Aminobenzoic Acid and <i>p</i>-Aminosalicylic Acid as Reducing Agent

A review on colorimetric methods for determination of organophosphate pesticides using gold and silver nanoparticles

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