Fluorescent detection of Cu(II) by chitosan-based AIE bioconjugate

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• 作者：Ya-lan Liu ; Zheng-ke Wang 王征科 ; Wei Qin…
• 关键词：Aggregation ; induced emission ; Chitosan ; Cu(II) ; Fluorescent detection
• 刊名：Chinese Journal of Polymer Science
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：35
• 期：3
• 页码：365-371
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Polymer Sciences; Industrial Chemistry/Chemical Engineering; Characterization and Evaluation of Materials; Condensed Matter Physics;
• 出版者：Chinese Chemical Society and Institute of Chemistry, CAS
• ISSN：1439-6203
• 卷排序：35

文摘

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 Hg2+, Pb2+, Zn2+, Cd2+, Fe2+, Fe3+ due to the RIR caused by the complexation between CS and metal ions. However, for Cu2+, 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).