席夫碱
纤维素
水溶液
检出限
铜
化学
聚乙烯亚胺
肉眼
材料科学
高分子化学
色谱法
有机化学
生物化学
转染
基因
作者
Lianwei Zhang,Ruijia Wang,Rui Li,Xiaolin Du,Ranju Meng,Lin Liu,Juming Yao
出处
期刊:Cellulose
[Springer Nature]
日期:2018-10-09
卷期号:25 (12): 6947-6961
被引量:26
标识
DOI:10.1007/s10570-018-2083-x
摘要
In this work, a novel colorimetric sensor was prepared via a cellulose-polyethylenimine-based Schiff base (cellulose-Schiff base) for capturing and detecting copper ions (Cu2+) in aquatic environments and life systems. The cellulose-Schiff base displayed continuous color changes from inherent pale yellow to deep green due to the formation of a cellulose-Schiff base-Cu2+ charge transfer complex within 30 s, indicating excellent “naked-eye” detection capability for Cu2+ ions in aqueous solution. The limit of detection (LOD) was 1.054 ppm, lower than the U.S. EPA guidelines for drinking water of 1.3 ppm. Moreover, the cellulose-Schiff base colorimetric sensor was successfully used to capture and detect exogenous Cu2+ ions in biofluids (simulated urine and bovine serum). The proposed sensing mechanism of the cellulose-Schiff base for Cu2+ ions is that N atoms (C=N and N–H) in the sensor capture and concentrate Cu2+ ions to form sensor-Cu2+ complexes, then intramolecular charge transfer occurs as a consequence. In addition, test strips based on cellulose-Schiff base were developed, and provide a convenient, cheap, sensitive, and reliable monitoring platform for on-site semi-quantitative analysis of Cu2+ ions in real samples.
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