Real-time fluorescent detection of food spoilage with doped quantum dots-anchored hydrogel sensor  

作　　者：Chenying Li Jianzhong Li Lei Ji Yibin Zhu Jiajia Liu Jiatao Zhang 

机构地区：[1]School of Materials Science and Engineering,Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications,Beijing Institute of Technology,Beijing 100081,China [2]School of Chemistry and Chemical Engineering,MIIT Key Laboratory of Medical Molecule Science and Pharmaceutical Engineering,MOE Key Laboratory of Cluster Science,Beijing Institute of Technology,Beijing 100081,China

出　　处：《Nano Research》2024年第12期10467-10475,共9页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.51872030).

摘　　要：Spermine assumes a pivotal role in assessing food safety due to its potential to induce a spectrum of diseases upon excessive consumption.However,contemporary spermine detection methodologies,exemplified by high-performance liquid chromatography(HPLC),demand costly instrumentation and the expertise of skilled technicians.To address this challenge,the study introduces a portable fluorescence sensing platform.Ratiometric fluorescent probes were realized through the utilization of CdS quantum dots deeply doped with Ag^(+)(CdS:Ag QDs)and nitrogen-doped carbon quantum dots(N-CQDs).Hydrogen bonds formed between CdS:Ag QDs and spermine result in the formation of the assembly and the decreasing of the fluorescence intensity.In an effort to broaden the applicative scope and streamline deployment processes,fluorescent sensing hydrogels were meticulously engineered,capitalizing on the swelling properties inherent in polyvinyl alcohol(PVA)hydrogels.The systematic delineation of the correlation between 1-R/B and spermine concentration facilitates the quantitative determination of spermine concentration.The incorporation of this composite construct serves to alleviate environmental influences on the probes,thereby augmenting their precision.The portable fluorescent sensing platform proves pivotal in expeditiously measuring spermine concentration within the fluorescent sensing hydrogel,enabling a quantitative assessment of pork freshness.The utilization of this platform for food freshness evaluation imparts the benefits of convenience,cost-effectiveness,and intuitive operation.

关 键 词：Ag^(+)doped CdS quantum dots nitrogen-doped carbon quantum dots ratiometric fluorescent sensing hydrogel portable platform spermine detection 

分 类 号：TQ427.26[化学工程]