Citation:
LIAO Xiao-Qing, WANG Hui-Ying, LI Zai-Jun. Fluorescence “on-off” Response of Bovine Serum Albumin-Cu System Towards Hydrogen Peroxide and L-Cysteine and Their Analysis Applications[J]. Chinese Journal of Analytical Chemistry,
;2015, 43(12): 1820-1828.
doi:
10.11895/j.issn.0253-3820.150413
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The synthesis and application of copper nanoclusters(CuNCs) as optical probe have attracted a great attention. The study shows that bovine serum albumin(BSA) CAN react with copper ions(Cu2+) in a base medium to form stable BSA-Cu complex. In the solution, the introduction of hydrogen peroxide can remarkably accelerate the formation of CuNCs. At the same time, the fluorescence intensity rapidly increases. Based on the fluorescence "light-on" response of BSA-Cu system, a kinetics method was developed for the fluorescent detection of hydrogen peroxide. The fluorescence intensity of BSA-Cu linearly increased with the increase of hydrogen peroxide in the range from 1.0×10-6 mol/L to 1.5×10-3 mol/L with the detection limit of 3.1×10-7 mol/L(S/N=3). After that, the collected BSA-Cu solution was placed until its fluorescence intensity increases to the maximum value, in which the Cu2+ ions were fully changed into CuNCs. The experiment demonstrated that the addition of L-cysteine into the solution led to an obvious fluorescence quenching. Based on the fluorescence "light-off" response of BSA-Cu system towards L-cysteine, an analytical method was established for the fluorescent determination of L-cysteine. The fluorescence intensity linearly reduced with the increase of L-cysteine concentration in the range of 2.0×10-4-1.0×10-2 mol/L with the detection limit of 5.7×10-5 mol/L(S/N=3). Finally, the resulted BSA-Cu waste was treated by high temperature ashing and then dissolving with sulfuric acid, in which the CuNCs were turned into Cu2+ ions. The resulting Cu2+ solution continued to be used for the detection of H2O2 and L-cysteine in the next cycle. In the work, the cycle detection of hydrogen peroxide and L-cysteine and reuse of copper could be achieved using the conversion between Cu2+ and copper nanoclusters. The method provides the characteristics of high sensitivity, low cost and environment-friendly, and can be widely used for routine analysis of hydrogen peroxide and L-cysteine.
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