Determination of trace silver by solid substrate-room temperature phosphorescence quenching method based on double catalytic system of meta-nitrophenyfluorone-polyoxyethylene-chromium-potassium bromate-β-cyclodextrin

We report on the determination of silver ion in human hair sample using ionic liquid cold-induced aggregation combined with spectrophotometric detection. Parameters governing the extraction efficiency (such as concentration of ligand, volume of ionic liquid, pH, temperature, extraction time) were optimized and resulted in enrichment factor of 44.4 for silver ion. The calibration curve was linear with correlation coefficient (R 2 ) of 0.999, in the concentration range from 1.0 to 20 ng mL -1 . The relative standard deviation is 2.3% (for n = 10), the limit of detection is 0.262 ng mL -1 , and relative recoveries in real samples were more than 93%.

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Determination of Silver in Human Hair by Ionic Liquid‐based Cold‐induced Aggregation Microextraction as a Solvent Extraction Method

Bahar

Hosseini

2014

J Chinese Chemical Soc

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Determination of trace silver in environmental samples by room temperature ionic liquid-based preconcentration and flame atomic absorption spectrometry

2011

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A Promising CdSe@CdS-Quantum Dots-Cysteine for the Determination of Trace IgE by Solid Substrate Room Temperature Phosphorescence Immunoassay

et al. 2011

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The labelling reagent CdSe@CdS-QDs-Cys (QDs-Cys) with the grain diameter of 4.5 nm was synthesized by modifying CdSe@CdS quantum dots (QDs) with cysteine (Cys). At the same time, QDs-Cys-Ab(IgE), a phosphorescent quantum dot probe, was developed based on the labelling reaction between -COOH of QDs-Cys and -NH(2) of goat anti human IgE antibody (Ab(IgE)). This probe with excellent biocompatibility and high specificity could not only emit strong and stable room temperature phosphorescence (RTP), but also could carry out specific immunoassay (IA) with immunoglobulin E (IgE), causing the RTP of the system to sharply enhance. Thus, a new solid substrate room temperature phosphorescence immunoassay (SSRTPIA) for the determination of IgE was established. The limit of quantification (LOQ) of the method was 0.12 fg spot(-1), corresponding concentration was 3.0 × 10(-13) g mL(-1) and sampling quantity was 0.40 μL spot(-1). This highly selective, sensitive and accurate SSRTPIA has been applied to determine IgE in biological samples and diagnose diseases, and the results agreed well with those obtained by enzyme-link immunoassay (ELISA). Meanwhile, the mechanisms of QDs-Cys labelling Ab(IgE) and the determination of IgE by SSRTPIA were also discussed.

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Determination of trace silver by solid substrate-room temperature phosphorescence quenching method based on double catalytic system of meta-nitrophenyfluorone-polyoxyethylene-chromium-potassium bromate-β-cyclodextrin

Cited by 9 publications

References 9 publications

Determination of Silver in Human Hair by Ionic Liquid‐based Cold‐induced Aggregation Microextraction as a Solvent Extraction Method

Determination of Silver in Human Hair by Ionic Liquid‐based Cold‐induced Aggregation Microextraction as a Solvent Extraction Method

Determination of trace silver in environmental samples by room temperature ionic liquid-based preconcentration and flame atomic absorption spectrometry

A Promising CdSe@CdS-Quantum Dots-Cysteine for the Determination of Trace IgE by Solid Substrate Room Temperature Phosphorescence Immunoassay

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