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Microchimica Acta

, 186:98 | Cite as

Silicon quantum dot-coated onto gold nanoparticles as an optical probe for colorimetric and fluorometric determination of cysteine

  • Lirong Liu
  • Gangbing Zhu
  • Wei Zeng
  • Yinhui Yi
  • Baohe Lv
  • Junjuan Qian
  • Depeng Zhang
Original Paper
  • 44 Downloads

Abstract

Silicon quantum dots (SiQDs) were synthesized from N-[3-(trimethoxysilyl)propyl]-ethylenediamine and catechol by a hydrothermal method. Transmission electron microscopy, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy were used to characterize the morphology and structure of quantum dots. The SiQDs were then placed on gold nanoparticles (AuNPs). When Cys is added to this solution, Cys will penetrate the SiQDs “shell” of the SiQDs/AuNP composite. This is due to the interaction and conformational differences of Cys and other substance with AuNPs and leads to the dispersion of the aggregated SiQD/AuNPs. A color change from purple to red can be visually observed, and the (green) fluorescence of SiQDs (with excitation/emission peaks at 430/520 nm) is restored. This dual-readout nanoprobe was successfully applied to the selective and sensitive detection of cysteine (Cys) in (spiked) serum and urine samples. The detection limit is 3.5 nmol·L−1 (at an S/N ratio of 3), and the method works on the 0.01 to 2 μM Cys concentration range.

Graphical abstract

Schematic illustration of a method for synthesizing silicon quantum dots (SiQDs) and coating them on gold nanoparticles (AuNPs) as an optical probe for colorimetric and fluorometric determination of cysteine.

Keywords

Amino acid detection Fluorescence probe Colorimetric probe Quenching FRET Stern-Volmer plot Steric hindrance effect Serum analysis Urine analysis 

Notes

Acknowledgments

We acknowledge the support from the National Natural Science Foundation of China (21607061), the Opening Project of State Key Laboratory of Chemo/Biosensing and Chemometrics of Hunan University (2016017), the Priority Academic Program Development of Jiangsu Higher Education Institutions, Collaborative Innovation Center of Technology and Material of Water Treatment, and the Program of Young Backbone Teachers in Jiangsu University (2015).

Compliance with ethical standards

The author(s) declare that they have no competing interests.

Supplementary material

604_2019_3228_MOESM1_ESM.doc (5.5 mb)
ESM 1 (DOC 5.51 mb)

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  1. 1.School of the Environment and Safety EngineeringJiangsu UniversityZhenjiangPeople’s Republic of China

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