Fluorescent chitosan hydrogel for highly and selectively sensing of p-nitrophenol and 2, 4, 6-trinitrophenol

Shuangyu Xiong; Luminita Marin; Lian Duan; Xinjian Cheng

doi:10.1016/j.carbpol.2019.115253

Fluorescent chitosan hydrogel for highly and selectively sensing of p-nitrophenol and 2, 4, 6-trinitrophenol

Carbohydr Polym. 2019 Dec 1:225:115253. doi: 10.1016/j.carbpol.2019.115253. Epub 2019 Aug 27.

Authors

Shuangyu Xiong¹, Luminita Marin², Lian Duan³, Xinjian Cheng⁴

Affiliations

¹ School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan, 430073, China.
² "Petru Poni'' Institute of Macromolecular Chemistry of Romanian Academy, Iasi, Romania. Electronic address: lmarin@icmpp.ro.
³ School of Textiles and Garments, Southwest University, Chongqing, 400715, PR China.
⁴ School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan, 430073, China. Electronic address: chxj606@163.com.

PMID: 31521279
DOI: 10.1016/j.carbpol.2019.115253

Abstract

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 μM. The fluorescence fictionalization cause slight influence to the gel performance of chitosan.

Keywords: Fluorescent chitosan; Sensing mechanism; Trinitrophenol (TNP); p-nitrophenol (4-NP).