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

Nano Research 2024年第12期17卷 10467-10475页

作者： Chenying Li Jianzhong Li Lei Ji Yibin Zhu Jiajia Liu Jiatao Zhang School of Materials Science and Engineering Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green ApplicationsBeijing Institute of TechnologyBeijing 100081China School of Chemistry and Chemical Engineering MIIT Key Laboratory of Medical Molecule Science and Pharmaceutical EngineeringMOE Key Laboratory of Cluster ScienceBeijing Institute of TechnologyBeijing 100081China

spermine assumes a pivotal role in assessing food safety due to its potential to induce a spectrum of diseases upon excessive ***,contemporary spermine detection methodologies,exemplified by high-performance liquid chromatography(HPLC),demand costly instrumentation and the expertise of skilled *** address this challenge,the study introduces a portable fluorescence sensing *** 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 *** 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)*** systematic delineation of the correlation between 1-R/B and spermine concentration facilitates the quantitative determination of spermine *** incorporation of this composite construct serves to alleviate environmental influences on the probes,thereby augmenting their *** portable fluorescent sensing platform proves pivotal in expeditiously measuring spermine concentration within the fluorescent sensing hydrogel,enabling a quantitative assessment of pork *** 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

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Fluorescent Nile blue-functionalized poly(N-isopropylacrylamide)microgels responsive to temperature and polyamines

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SmartMat 2024年第2期5卷 156-168页

作者： Qiming Shen Changhao Fang Liang Hu Michael J.Serpe Department of Chemistry University of AlbertaEdmontonAlbertaCanada State Key Laboratory of Radiation Medicine and Protection Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutionsand School for Radiological and Interdisciplinary Sciences(RAD-X)Soochow UniversitySuzhouChina

Fluorescent poly(N-isopropylacrylamide-co-Nile blue)(pNIPAm-co-NB)microgels were synthesized that exhibited fluorescence intensity changes in a water temperature-dependent *** is well known to exhibit fluorescence intensity that depends on the hydrophobicity of the environment,while pNIPAm-based microgels are well known to transition from swollen(hydrophilic)to collapsed(relatively hydrophobic)at temperatures greater than 32℃;hence,we attribute the above behavior to the hydrophobicity changes of the microgels with increasing *** phenomenon is ultimately due to NB dimers(relatively quenched fluorescence)being broken in the hydrophobic environment of the microgels leading to relatively enhanced *** went on to show that the introduction of cucurbit[7]uril(CB[7])into the pNIPAm-co-NB microgels enhanced their fluorescence allowing them to be used for polyamine(e.g.,spermine[SPM])***,CB[7]forms a host–guest interaction with NB in the microgels,which prevents NB dimerization and enhances their *** SPM is present,it forms a host–guest complex that is favored over the CB[7]-NB host–guest interaction,which frees the NB for dimerization and leads to fluorescence *** a result,we could generate an SPM sensor capable of SPM detection down to~0.5µmol/L in complicated matrixes such as serum and urine.

关键词： cucurbituril fluorescence pNIPAm-co-NB microgel spermine detection thermoresponsive

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