Kim, Kyung Min Nam, Yun-Sik Lee, Yeonhee Lee, Kang-Bong 2024-01-20T01:03:20Z 2024-01-20T01:03:20Z 2021-09-05 2017-07 0306-7319 https://pubs.kist.re.kr/handle/201004/122561 A sensitive colorimetric method for the determination of iodide ions was developed using gold nanoparticles (AuNPs) functionalised with glycol chitosan (GCS). The iodide ions were at the centre of the O-I--O coordination structure, formed with the GCS-AuNPs, reducing their interparticle distance and inducing aggregation. Time-of-flight secondary ion mass spectrometry analyses showed that the bound iodide ions were coordinated to the oxygen atoms of the ethylene glycol in GCS, with this aggregation leading to a considerable variation in colour from light red to dark violet. Using this GCS-AuNP probe, the iodide ion concentration in environmental, biological and pharmaceutical samples could be determined by both the naked eye and UV-Vis spectroscopy. Additionally, the sensitivity of the detection was found to be markedly enhanced at pH 6, where a more pronounced colour change was observed. The absorption ratio A(700)/A(521) of the functionalised AuNP solution correlated linearly with the iodide ion concentration within the range 0.0-10.0mg/L, and the limits of detection in tap water, pond water, and bovine serum solution were 3.5, 3.6, and 3.4g/L, respectively. The present assay method can thus be utilised to rapidly measure the concentration of iodide ions in aqueous samples. English TAYLOR & FRANCIS LTD PERFORMANCE LIQUID-CHROMATOGRAPHY PLASMA-MASS SPECTROMETRY COLORIMETRIC DETECTION SILVER NANOPARTICLES FLUORESCENT-PROBES DEFICIENCY PREGNANCY GROWTH SENSOR SPECIATION Highly sensitive and selective assay method for iodide ion determination based on gold nanoparticles conjugated with glycol chitosan Article 10.1080/03067319.2017.1346090 1 INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY, v.97, no.7, pp.673 - 683 INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY 97 7 673 683 scie scopus 000405810200006 2-s2.0-85021836361 Chemistry, Analytical Environmental Sciences Chemistry Environmental Sciences & Ecology Article PERFORMANCE LIQUID-CHROMATOGRAPHY PLASMA-MASS SPECTROMETRY COLORIMETRIC DETECTION SILVER NANOPARTICLES FLUORESCENT-PROBES DEFICIENCY PREGNANCY GROWTH SENSOR SPECIATION I- ion probe gold nanoparticle glycol chitosan nanoparticle functionalisation colorimetric probe