镧系元素
肉眼
发光
化学
壳聚糖
核化学
螯合作用
醛
席夫碱
无机化学
高分子化学
离子
检出限
材料科学
色谱法
有机化学
催化作用
光电子学
作者
Qi Zhou,Xuelin Dong,Binbin Zhang,Xinwei Zhang,Kaide Ou,Qin Wang,Yonggui Liao,Yajiang Yang,Hong Wang
标识
DOI:10.1016/j.jcis.2021.11.121
摘要
In this work, a pH-tunable multicolor luminescent lanthanide-based hydrogel (CS/DEX/CP) was prepared based on lanthanide coordination polymer (CP), dextran aldehyde (DEX) and chitosan (CS). The CP was obtained by the self-assembly of guanosine acid (GMP), ciprofloxacin (CIP), Eu3+, and Tb3+. As-prepared CS/DEX/CP hydrogel could emit blue, green, and red luminescence of CIP, Tb3+, and Eu3+, respectively. It was also found that the luminescence of CS/DEX/CP hydrogel exhibited visual color change in the pH range of 5.5 to 8. Such pH-sensitive hydrogel was multicolor-responsive to protons produced by bacterial growth, therefore, it could provide early warning of bacterial infection by naked-eye. In addition, the increased acidity resulted in not only the degradation of acid-labile Schiff base linkages between DEX and CS, but also the fracture of coordination between CIP and lanthanide ions. As a result, the released CIP and CS showed significantly antibacterial activity against both S. aureus and E. coli.
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