Synthesis of fluorescent BSA templated silver nanomaterials and it’s application of detection of Zn2+ and Co2+

Abstract

In this paper, BSA (bovine serum albumin) was used as stabilizer and protectant to synthesize high fluorescent silver nanoparticles (BSA-AgNPs) in ice bath. A method for the detection of metal ions was developed by using silver nanoparticles as fluorescent probes. The experimental results show that the BSA-AgNPs has unique selectivity for cobalt ions and zinc ions. When the cobalt ion exists in the system, the BSA-AgNPs is destroyed and the fluorescence quenching is caused, and the correlation coefficient is R = 0.970 35 when the concentration of cobalt ion is 100 μmol/L–600 μmol/L, and the correlation coefficient is R = 0.970 35. When the zinc ion exists in the system, the interaction of Zn2+ and BSA leads to the rise of the BSA-AgNPs fluorescein, and the Zn2+ concentration is in the 100 μmol/L–600 μmol/L. BSA-AgNPs shows a good linear relationship. The correlation coefficient is 0.985 90. EDTA can be used as a metal ion chelating agent. The rapid complexation of Co2+ with EDTA blocked the interaction between Co2+ and BSA, and the fluorescence of BSA-AgNPs could be restored. Based on this, the label free detection of zinc ions and cobalt ions was completed. Therefore, the prepared high fluorescence BSA-AgNPs sensor has a good application prospect in ion detection.