Blue-light emitting aminated pectin for detecting Cu2+ ion

Chengsheng Ni; Wenxuan Lu; Jing Zhang; Luo Peng; Deti Xie; Jiupai Ni

doi:10.1016/j.ijbiomac.2021.02.084

Blue-light emitting aminated pectin for detecting Cu²⁺ ion

Int J Biol Macromol. 2021 Apr 15:176:272-281. doi: 10.1016/j.ijbiomac.2021.02.084. Epub 2021 Feb 13.

Authors

Chengsheng Ni¹, Wenxuan Lu², Jing Zhang², Luo Peng², Deti Xie³, Jiupai Ni⁴

Affiliations

¹ College of Resources of Environment and Resources, Southwest University, BeiBei, Chongqing 400715, China; National Base of International S&T Collaboration on Water Environmental Monitoring and Simulation in Three Gorges Reservoir Region, Chongqing 400716, China. Electronic address: nichengsheg@swu.edu.cn.
² College of Resources of Environment and Resources, Southwest University, BeiBei, Chongqing 400715, China.
³ College of Resources of Environment and Resources, Southwest University, BeiBei, Chongqing 400715, China; National Base of International S&T Collaboration on Water Environmental Monitoring and Simulation in Three Gorges Reservoir Region, Chongqing 400716, China.
⁴ College of Resources of Environment and Resources, Southwest University, BeiBei, Chongqing 400715, China; National Base of International S&T Collaboration on Water Environmental Monitoring and Simulation in Three Gorges Reservoir Region, Chongqing 400716, China. Electronic address: nijiupai@swu.edu.cn.

PMID: 33592262
DOI: 10.1016/j.ijbiomac.2021.02.084

Abstract

This research studied the chemo-sensing of low-cost aminated pectin (PE) obtained by a facile calcination under ammonia gas at temperature no higher than 175 °C without excessive use of alkaline, acid or solvents. The ammonia gas was found to replace the hydroxyl and methoxyl group, enhancing the crystallinity and solubility of the resultant pectin than those calcined in air or in 5% H₂. Though the increase of light absorption could be attributed mainly to the dehydration during calcination which caused the formation of CC double bond or aromatic ring, the N incorporation could be important to the photoluminescence (PL) emission. The PL quenching of the blue fluorescent aminated pectin showed a good linearity with the concentration of Cu²⁺, Fe³⁺ and the highest sensitivity toward Cu²⁺ among the investigated metal ions. In order to further increase the PL quenching toward Cu²⁺ and decrease the interference of Fe³⁺, a method involving H₂O₂ and ultraviolet illumination was developed to catalyze the oxidation of fluorophores on the polymer. This work provides new horizon on the modification and application of pectin in chemosensing.

Keywords: Amination; Chemo-sensing; Pectin.

MeSH terms

Copper / analysis*
Luminescent Measurements*
Pectins / chemistry*

Substances

Copper
Pectins