ArticleMikrochimica acta2018
A paper-based optical probe for chromium by using gold nanoparticles modified with 2,2'-thiodiacetic acid and smartphone camera readout.
Article in Mikrochimica acta, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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Who cites it
8 citing papers in PubMed, 37 citations in OpenAlex.
- Article
- An Ultra-Sensitive Colorimetric Sensing Platform for Simultaneous Detection of Moxifloxacin/Ciprofloxacin and Cr(III) Ions Based on Ammonium Thioglycolate Functionalized Gold Nanoparticles.Sensors (Basel, Switzerland) · 2025Article
- Chitosan-stabilized gold nanoparticles decorated with a thiodiacetic acid nanoprobe for selective detection of arsenic(iii) in rice and water samples.RSC advances · 2024Article
- Review
- The colorimetric and microfluidic paper-based detection of cysteine and homocysteine using 1,5-diphenylcarbazide-capped silver nanoparticles.RSC advances · 2021Article
- Recent Advances in Microfluidic Paper-Based Analytical Devices toward High-Throughput Screening.Molecules (Basel, Switzerland) · 2020Review
- A review on advances in methods for modification of paper supports for use in point-of-care testing.Mikrochimica acta · 2019Review
- A fluorometric paper test for chromium(VI) based on the use of N-doped carbon dots.Mikrochimica acta · 2019Article
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Authors and funding
4 authors at 2 institutions in 1 country.
Funding
Abstract
A paper based analytical device is presented for the determination of Cr(III) and Cr(VI) using gold nanoparticles (AuNPs) modified with 2,2'-thiodiacetic acid. The modified AuNPs were characterized using UV-Vis spectrophotometry, Fourier transform infrared, dynamic light scattering, zeta potential, energy dispersive spectroscopy and transmission electron microscopy. Cr(III) ions induce the aggregation of the modified AuNPs, and the color of the nanoprobe changes from red to blue. This can be detected visually, or by colorimetry, or with a camera. No interference is observed in the presence of 19 other cations and anions. Cr(VI) (chromate) can be determined by after reduction to Cr(III) by using ascorbic acid and then quantified total Cr(III). The concentration of Cr(VI) is obtained by subtracting the concentration of Cr(III) from that of total chromium. Under optimal conditions, the ratio of the absorbances measured at 670 (blue) and 522 (red) increases linearly in the 1.0 nM to 22.1 μM chromium concentration range, with 0.66 nM (0.034 ppb) limit of detection (LOD) in solution. In case of the paper device, the linear range extends from 1.0 nM to 0.1 mM, and the LOD is 0.64 nM (0.033 ppb). The method was applied to the determination of chromium in spiked water, urine and dilutes human plasma, and results were confirmed by GF-AAS analysis. This method is highly selective, fast and portable, requires minimum volume of reagents and samples and no washing steps. Graphical abstract A paper based analytical device is presented for determination of Cr(III) and Cr(VI) using gold nanoparticles modified with 2,2'-thiodiacetic acid. In paper optical probe, linear range and limit of detection are 1.0 nM to 0.1 mM and 0.64 nM, respectively. The method was applied to the determination of total chromium in spiked water, urine and dilutes human plasma, and results were confirmed by GF-AAS analysis.
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