The interaction of CuInS2/ZnS/TGA quantum dots with tyrosine kinase inhibitor and its application

The interactions between thioglycolic acid-capped-CuInS2/ZnS quantum dots (CuInS2/ZnS/TGA QDs) and tyrosine kinase inhibitor (TKI) were investigated using fluorescence, ultraviolet-visible spectrometry and Fourier transform infrared spectrometry. The results indicated that the fluorescence intensity of CuInS2/ZnS/TGA could be quenched by imatinib, dasatinib, nilotinib, gefitinib and erlotinib, which hinted that CuInS2/ZnS/TGA QDs could be used in the detection of TKI in active pharmaceutical ingredients (API). Calibration curves showed good linear correlation and low detection limits. The average recovery was between 98 and 102%. Moreover, the nature of the fluorescence quenching mechanism of CuInS2/ZnS/TGA QDs by TKI was discussed. A ground state complex was formed by hydrogen bonding between the carboxyl group of CuInS2/ZnS/TGA QDs and the amino group of TKI. This led to an increase in non-radiative transition and fluorescence quenching of CuInS2/ZnS/TGA QDs. Copyright (c) 2014 John Wiley & Sons, Ltd.