期刊
JOURNAL OF LUMINESCENCE
卷 179, 期 -, 页码 83-92出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2016.06.055
关键词
Captopril; Glutathione functionalized graphene quantum dots; Stern-Volmer based sensing; Spectral red-shift based sensing; Photoluminescence switch on/off sensor
类别
资金
- CNPq [474220/2013-3, 302888/20132-6, 125871/2015-5]
- FAPERJ [E-26/201.406/2014, E-26/201.750/2015, E-26/200.435/2016]
The determination of captopril is proposed using graphene quantum dots produced by the pyrolysis of citric acid and glutathione (GSH-GQDs). Captopril induces both quenching and spectral red-shifting in the photoluminescence from aqueous dispersions of GSH-GQDs. By employing Fe3+ as mediator (that enables signal quenching of GSH-GQDs), the presence of captopril restored the photoluminescence of quantum dots. Under optimized experimental conditions, the signal quenching from the GSH-GQDs as function of the concentration of captopril showed a linear response range covering three orders of magnitude (10(-6) to 10(-4) mol L-1). The proposed approaches were tested by determining captopril in simulated samples and in commercial pharmaceutical formulations. The measurement of either the spectral shifting observed of the GSH-GQDs probe or the photoluminescence switch on/off using GQDs-GSH-Fe3+ resulted in satisfactory recoveries of captopril, showing the quantitative sensing potential. (C) 2016 Elsevier B.V. All rights reserved.
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