Fluorescent Detection of Cu(Ⅱ) by Chitosan-based AIE Bioconjugate
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Fluorescent Detection of Cu(Ⅱ) by Chitosan-based AIE Bioconjugate
Chinese Journal of Polymer ScienceVol. 35, Issue 3, Pages: 365-371(2017)
Affiliations:
a. Ministry of Education Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
b. Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Hangzhou 310027, China
c. Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
Liu Ya-lan, Wang Zheng-ke, Qin Wei, et al. Fluorescent Detection of Cu(Ⅱ) by Chitosan-based AIE Bioconjugate[J]. Chinese Journal of Polymer Science, 2017, 35(3): 365-371.
DOI:
Liu Ya-lan, Wang Zheng-ke, Qin Wei, et al. Fluorescent Detection of Cu(Ⅱ) by Chitosan-based AIE Bioconjugate[J]. Chinese Journal of Polymer Science, 2017, 35(3): 365-371.DOI: 10.1007/s10118-017-1876-y.
Fluorescent Detection of Cu(Ⅱ) by Chitosan-based AIE Bioconjugate
Detection of Cu(Ⅱ) is very important in disease diagnose
biological system detection and environmental monitoring. Previously
we found that the product TPE-CS prepared by attaching the chromophores of tetraphenylethylene (TPE) to the chitosan (CS) chains showed excellent fluorescent properties. In this study
we tried to use TPE-CS for detecting Cu(Ⅱ) because of the stable complexation of CS with heavy metals and the luminosity mechanism of the Restriction of Intramolecular Rotations (RIR) for aggregation-induced emission (AIE)-active materials. The fluorescence intensity changed when TPE-CS was contacted with different metal ions
to be specific
no change for Na
+
slightly increase for Hg
2+
Pb
2+
Zn
2+
Cd
2+
Fe
2+
Fe
3+
due to the RIR caused by the complexation between CS and metal ions. However
for Cu
2+
an obvious fluorescence decrease was observed because of the Photoinduced-Electron-Transfer (PET). Moreover
we found that the quenched FL intensity of TPE-CS was proportional to the concentration of Cu(Ⅱ) in the range of 5 μmol/L to 100 μmol/L
which provided a new way to quantitatively detect Cu(Ⅱ). Besides
TPE-CS has excellent water-solubility as well as absorbability (the percentage of removal
R
=84%)
which is an excellent detection probe and remover for Cu(Ⅱ).
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