Colorimetric determination of cysteamine based on the aggregation of polyvinylpyrrolidone-stabilized silver nanoparticles

Krishnamoorthy Shanmugaraj, Thangarasu Sasikumar, Cristian H. Campos, Malaichamy Ilanchelian, Ramalinga Viswanathan Mangalaraja, Cecilia C. Torres

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

A simple, colorimetric and visual method is described for the determination of cysteamine (CA) using polyvinylpyrrolidone-stabilized silver nanoparticles (PVP-AgNPs) as a colorimetric probe. The sensing method was based on the aggregation of PVP-AgNPs that led to the changes in the color and absorption profile of the probe. The aggregation of PVP-AgNPs in the presence of CA was evidenced by using transmission electron microscopy (TEM), zeta and dynamic light scattering (DLS) measurements. A distinct color transition could be observed with the naked eye from pale yellow color of PVP-AgNPs to purple. PVP-AgNPs probe showed an excellent selectivity towards CA versus other interfering biomolecules, cations and anions. Furthermore, the colorimetric probe had a linear response for CA from 0.1 to 1.0 μM concentration range with the limit of detection (LOD) of 4.9 nM. The prepared probe was successfully utilized for the determination of CA in blood serum as biological samples.

Original languageEnglish
Article number118281
JournalSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Volume236
DOIs
Publication statusPublished - 5 Aug 2020

Keywords

  • Aggregation
  • Color change
  • Cysteamine detection
  • Optical probe
  • Quantitative detection
  • Visual detection

ASJC Scopus subject areas

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Spectroscopy

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