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Peer-reviewedCC BY-NC-NDACS measurement science au

Gold Nanostars as a Novel and Sensitive Indicator of Iodometry for Colorimetric Sensing.

  • Ting Yu1,2
  • Chao Qi1,2
  • Ying Fu1
  • Yuxiaoting Li1
  • Si Shen3
  • Zhi Ruan1
  • Jun Zhang1,3
  1. 1Department of Clinical Laboratory, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, Hangzhou, 310016 Zhejiang, China.
  2. 2Zhejiang Engineering Research Center for Intelligent Manufacturing of Clinical Diagnostic Equipment, Hangzhou, 310016 Zhejiang, China.
  3. 3School of Basic Medical Sciences and Forensic Medicine, Hangzhou Medical College, Hangzhou, 310013 Zhejiang, China.
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Abstract

Iodometry (iodometric method) is one of the simplest, fastest, and most accurate oxidation-reduction titrations for colorimetric detection. Starch is a key indicator for determining the reaction end point. However, the low solubility and instability of starch limit the sensitivity and application of the iodometry. Plasmonic nanomaterials have emerged as innovative tools to inject modern vitality into traditional methods. In this study, we report gold nanostars as a novel and sensitive indicator of iodometry for colorimetric sensing. Branched gold nanostars possess localized surface plasmon resonance (LSPR) properties, and their protruding tips can be specifically reshaped by iodide to tune the optical readout. As a color indicator, gold nanostars can be gradually etched with increasing iodide concentration, displaying a variety of color changes from blue to purple and finally to red. This colorimetric sensing strategy enables highly sensitive detection of iodine standards with a linear range from 0.125 μM to 20 μM and a limit of detection of 0.0375 ± 0.0013 μM. Proof-concept experiments demonstrate the colorimetric performance of gold nanostar indicators in direct iodometry, remnant iodometry, and displacement iodometry by detecting chlorine, sulfide, and copper ions in hospital wastewater. Gold nanostars have advantages such as good stability, easy handling, low cost, and high sensitivity, which provide great prospects for the widespread application of iodometry.

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Cite

BibTeXRIS
BibTeX
@article{yu2026gold,
  title = {{Gold Nanostars as a Novel and Sensitive Indicator of Iodometry for Colorimetric Sensing.}},
  author = {Ting Yu and Chao Qi and Ying Fu and Yuxiaoting Li and Si Shen and Zhi Ruan and Jun Zhang},
  journal = {ACS measurement science au},
  year = {2026},
  month = jul,
  doi = {10.1021/acsmeasuresciau.6c00123},
  url = {https://europepmc.org/article/MED/42921120},
  note = {CC BY-NC-ND},
}
RIS
TY  - JOUR
TI  - Gold Nanostars as a Novel and Sensitive Indicator of Iodometry for Colorimetric Sensing.
AU  - Ting Yu
AU  - Chao Qi
AU  - Ying Fu
AU  - Yuxiaoting Li
AU  - Si Shen
AU  - Zhi Ruan
AU  - Jun Zhang
PY  - 2026
DA  - 2026/07/31
JO  - ACS measurement science au
DO  - 10.1021/acsmeasuresciau.6c00123
UR  - https://europepmc.org/article/MED/42921120
AB  - Iodometry (iodometric method) is one of the simplest, fastest, and most accurate oxidation-reduction titrations for colorimetric detection. Starch is a key indicator for determining the reaction end point. However, the low solubility and instability of starch limit the sensitivity and application of the iodometry. Plasmonic nanomaterials have emerged as innovative tools to inject modern vitality into traditional methods. In this study, we report gold nanostars as a novel and sensitive indicator of iodometry for colorimetric sensing. Branched gold nanostars possess localized surface plasmon resonance (LSPR) properties, and their protruding tips can be specifically reshaped by iodide to tune the optical readout. As a color indicator, gold nanostars can be gradually etched with increasing iodide concentration, displaying a variety of color changes from blue to purple and finally to red. This colorimetric sensing strategy enables highly sensitive detection of iodine standards with a linear range from 0.125 μM to 20 μM and a limit of detection of 0.0375 ± 0.0013 μM. Proof-concept experiments demonstrate the colorimetric performance of gold nanostar indicators in direct iodometry, remnant iodometry, and displacement iodometry by detecting chlorine, sulfide, and copper ions in hospital wastewater. Gold nanostars have advantages such as good stability, easy handling, low cost, and high sensitivity, which provide great prospects for the widespread application of iodometry.
SN  - 2694-250X
ER  -