Journal
CARBOHYDRATE POLYMERS
Volume 225, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2019.115253
Keywords
Fluorescent chitosan; Trinitrophenol (TNP); p-nitrophenol (4-NP); Sensing mechanism
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Funding
- National Natural Science Foundation of China (NSFC) [41573106]
- China-Romania bilateral research collaboration project of the Ministry of Science and Technology of China [43-12]
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Nitroaromatic compounds, especially 2, 4, 6-trinitrophenol, have strong biological toxicity and explosive risks, so the detection of 2, 4, 6-trinitrophenol exhibit importantly practical and scientific significance. In this work, three fluorescence functionalized chitosan CNS 3, CNS 4 and CNS 5 were prepared using chitosan as matrix. When 2, 4, 6-trinitrophenol (TNP) and/or p-nitrophenol (4-NP) was present in spot, these fluorescent chitosan sensors produced notable fluorescence quenching. It renders the chitosan sensing ability to detect TNP and 4-NP selectively and sensitively. The sensing mechanism is investigated as well. When introduced electron-rich moieties to the fluorescent chitosan, the sensitive detecting ability could be obtained. Excellent recognition ability could reach as low as 0.28 mu M. The fluorescence fictionalization cause slight influence to the gel performance of chitosan.
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