Development of a robust, fast screening method for the potentiometric determination of iodide in urine and salt samples

Machado, Ana; Mesquita, Raquel B. R.; Oliveira, Sara M.; Bordalo, Adriano A.

doi:10.1016/j.talanta.2017.03.017

Cited by 21 publications

(11 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, developing a simple and convenient method for detecting iodide ions has important significance for iodine supplementation. There are methods such as voltammetry [8,9], spectrofluorimetry [10,11,12], spectrophotometry [13], potentiometry [14] and chromatography [15,16], among others. However, these methods have some limitations, including how time-consuming they are and the use of tedious procedures and sophisticated instrumentations, which limit their application.…”

Section: Introductionmentioning

confidence: 99%

Carbon Quantum Dots Prepared with Chitosan for Synthesis of CQDs/AuNPs for Iodine Ions Detection

et al. 2018

View full text Add to dashboard Cite

Water-soluble and reductive carbon quantum dots (CQDs) were fabricated by the hydrothermal carbonization of chitosan. Acting as a reducing agent and stabilizer, the as-prepared CQDs were further used to synthesize gold nanoparticles (AuNPs). This synthetic process was carried out in aqueous solution, which was absolutely “green”. Furthermore, the CQDs/AuNPs composite was used to detect iodine ions by the colorimetric method. A color change from pink to colorless was observed with the constant addition of I− ions, accompanied by a decrease in the absorbance of the CQDs/AuNPs composite. According to the absorbance change, a favorable linear relationship was obtained between ΔA and I− concentration in the range of 20–140 μM and 140–400 μM. The detection limit of iodide ions, depending on the 3δ/slope, was estimated to be 2.3 μM, indicating high sensitivity to the determination of iodide. More importantly, it also showed good selectivity toward I− over other anion ions, and was used for the analysis of salt samples. Moreover, TEM results indicated that I− ions induced the aggregation of CQDs/AuNPs, resulting in changes in color and absorbance.

show abstract

Section: Introductionmentioning

confidence: 99%

Carbon Quantum Dots Prepared with Chitosan for Synthesis of CQDs/AuNPs for Iodine Ions Detection

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The synthetic urine was prepared according to Machado [21]: 10 g/L of urea, 0.07 g/L of uric acid, 0.8 g/L of creatinine, 5.2 g/L of sodium chloride, 0.1 g/L of lactic acid, 0.4 g/L of citric acid, 0.37 g/L of calcium chloride dihydrate, 0.49 g/L of magnesium sulphate heptahydrate, 1.41 g/L of sodium sulphate, 0.95 g/L of potassium dihydrogen phosphate, 1.2 g/L of potassium hydrogen phosphate, and 0.49 g/L of glucose.…”

Section: Interference Assessmentmentioning

confidence: 99%

Design and Functionalization of a µPAD for the Enzymatic Determination of Nitrate in Urine

2021

View full text Add to dashboard Cite

In this work, the design of a microfluidic paper-based analytical device (μPAD) for the quantification of nitrate in urine samples was described. Nitrate monitoring is highly relevant due to its association to some diseases and health conditions. The nitrate determination was achieved by combining the selectivity of the nitrate reductase enzymatic reaction with the colorimetric detection of nitrite by the well-known Griess reagent. For the optimization of the nitrate determination μPAD, several variables associated with the design and construction of the device were studied. Furthermore, the interference of the urine matrix was evaluated, and stability studies were performed, under different conditions. The developed μPAD enabled us to obtain a limit of detection of 0.04 mM, a limit of quantification of 0.14 mM and a dynamic concentration range of 0.14–1.0 mM. The designed μPAD proved to be stable for 24 h when stored at room temperature in air or vacuum atmosphere, and 60 days when stored in vacuum at −20 °C. The accuracy of the nitrate μPAD measurements was confirmed by analyzing four certified samples (prepared in synthetic urine) and performing recovery studies using urine samples.

show abstract

“…[3][4][5] Thus, it is vital to develop simple and effective methods for the determination and dynamic tracking of iodide ions, which can provide abundant physiological and pathological information in clinical medicine. Until now, several approaches, such as spectrophotometry, 6 voltammetry, 7 potentiometry, 8 and chromatography, have been proposed for the detection of iodide ions. 9 However, many of the above methods are time-consuming for sample pre-treatment or difficult in realizing online real-time monitoring.…”

Section: Introductionmentioning

confidence: 99%

Urea-doped carbon dots as fluorescent switches for the selective detection of iodide ions and their mechanistic study

et al. 2021

View full text Add to dashboard Cite

show abstract

Development of a robust, fast screening method for the potentiometric determination of iodide in urine and salt samples

Cited by 21 publications

References 13 publications

Carbon Quantum Dots Prepared with Chitosan for Synthesis of CQDs/AuNPs for Iodine Ions Detection

Carbon Quantum Dots Prepared with Chitosan for Synthesis of CQDs/AuNPs for Iodine Ions Detection

Design and Functionalization of a µPAD for the Enzymatic Determination of Nitrate in Urine

Urea-doped carbon dots as fluorescent switches for the selective detection of iodide ions and their mechanistic study

Contact Info

Product

Resources

About