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Tytuł pozycji:

Size-modulated optical property of gold nanorods for sensitive and colorimetric detection of thiourea in fruit juice.

Tytuł:
Size-modulated optical property of gold nanorods for sensitive and colorimetric detection of thiourea in fruit juice.
Autorzy:
Zou BQ; Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, 400715, PR China.
Zhang HZ; Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, 400715, PR China.
Fu Z; Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, 400715, PR China.
Zhan T; Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, Qingdao University of Science and Technology, Qingdao, 266042, PR China. Electronic address: .
Wang J; Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, 400715, PR China. Electronic address: .
Źródło:
Talanta [Talanta] 2021 Apr 01; Vol. 225, pp. 121965. Date of Electronic Publication: 2020 Dec 13.
Typ publikacji:
Journal Article
Język:
English
Imprint Name(s):
Publication: Amsterdam : Elsevier
Original Publication: Oxford : Pergamon Press
MeSH Terms:
Gold*
Nanotubes*
Colorimetry ; Fruit and Vegetable Juices ; Thiourea
Contributed Indexing:
Keywords: Chemical etching; Colorimetry; Dark-field light scattering; Gold nanorods; Thiourea
Substance Nomenclature:
7440-57-5 (Gold)
GYV9AM2QAG (Thiourea)
Entry Date(s):
Date Created: 20210217 Date Completed: 20210514 Latest Revision: 20210514
Update Code:
20240104
DOI:
10.1016/j.talanta.2020.121965
PMID:
33592719
Czasopismo naukowe
As an important sulfur compound, thiourea (TU) has caused great concern because of its wide application as well as its serious toxicity and hazard to the environment. Thus, it is necessary to develop a sensitive and selective method for TU analysis. In this work, gold nanorods (AuNRs) acted as an optical probe to realize the sensitive and colorimetric detection of TU. In HCl medium, Fe 3+ at low concentration was difficult to oxide Au 0 to form Au + because of the high redox potential or the positive Gibbs free energy change. However, this process was possible when TU was present since the association constant between Au + and TU is great enough to bind with TU to form a stable complex to further promote the etching of AuNRs, resulting in the lower aspect ratio of AuNRs with the blue shift and intensity decrease in extinction spectra, accompanied by the divisive colors of AuNRs solution or colorful dark-field light scattering imaging of single AuNR. The blue-shift of AuNRs longitudinal plasmon resonance absorption (LPRA) band was proportional to the concentration of TU in the range of 1-250 nM and the limit of detection (3σ/k) was as low as 0.4 nM. In addition, the colorimetric method was proven with high selectivity in the presence of potential interfering compounds, which was successfully applied to the detection of TU in fruit juice samples. This proposed colorimetric method provides a simple, sensitive yet selective measurement tool for TU sensing, which may offer new opportunities in the development of colorimetric sensors for food safety in the future.
(Copyright © 2020 Elsevier B.V. All rights reserved.)

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