ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Zongjie Zhang,Hongxia Zhang,Lili Hou,Dagong Jia,Kaixin Yao,Qingyang Meng,Jiayi Qu,Bing Yan,Qingxin Luan,Tiegen Liu
The pH value plays a vital role in many biological and chemical reactions. In this work, the fiber-optic chemical pH sensors were fabricated based on carboxyl ZnCdSe/ZnS quantum dots (QDs) and tapered optical fiber . The photoluminescence (PL) intensity of QDs is pH-dependence because protonation and deprotonation can affect the process of electron-hole recombination. The evanescent wave of tapered optical fiber was used as excitation source in the process of PL. To obtain higher sensitivity, the end faces of fiber were optimized for cone region. By lengthening the cone region and shrinking the end diameter of optical fiber, evanescent wave was enhanced and the excitation times of QDs were increased, which improved the PL intensity and the sensitivity of the sensor. The sensitivity of sensor can reach as high as 0.139/pH in the range of pH 6.00–9.01. The surface functional modification was adopted to prepare sensing films. The carboxyl groups on the QDs ligands are chemically bonded to the fiber surface, which is good for response time (40 s) and stability (decreased 0.9 % for 5 min). These results demonstrated that ZnCdSe/ZnS QDs-based fiber-optic chemical pH sensors are promising approach in rapid and precise pH detection.
研究领域:
生物化学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Yahui He,Yao Zhu,Siyuan Wang,Haixiang Wang,Aijin Ma,Jing Wang,Baoguo Sun
This study used the phase inversion method to prepare a novel ZnCdSe/ZnS quantum dot molecularly imprinted (ZnCdSe/ZnS@MIPs) polyethersulfone (PES) fluorescent composite (ZnCdSe/ZnS@MIPs@PES) membrane for the rapid detection of pyrraline (PRL). This membrane addressed the challenges presented by quantum dots molecularly imprinted polymers (QDs@MIPs) particles in liquids and required no pre-treatments during the analysis for accurate content determination at a low LOD. When the samples passed through the membrane via an automatic circulating filtration device, the PRL was specifically adsorbed due to the imprinted recognition sites on the ZnCdSe/ZnS@MIPs particles, causing membrane fluorescence quenching. Matrix-interfering components were removed for the porous structure of the membrane. Compared with the ZnCdSe/ZnS@MIPs solution method, the detection limit and accuracy of the ZnCdSe/ZnS@MIPs@PES membrane technique was significantly more successful in enhancing enrichment and purification functionality, reducing the analysis duration from 3 to 4 d to 45 min, while the operational procedure was decreased from 16 steps to two. When applied for PRL analysis in milk with 15% PES content and 6 mg ZnCdSe/ZnS@MIPs addition, the PRL was quantitatively detected in a broad concentration range (30–1000 μg/L) with R 2 =0.99. The LOD of ZnCdSe/ZnS@MIPs@PES membrane decreased at a higher sample injection volume, reaching a minimum of 18.1476 μg/L at 14 mL injection.
研究领域:
分析化学
·
材料科学
·
环境科学
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Cheng Xin,Jingming Zhou,Yumei Chen,Yankai Liu,Hongliang Liu,Chao Liang,Xifang Zhu,Ying Zhang,Zhuting Chen,Xueyuan Tang,Bingxue Zhang,Mengjun Lu,Jiaojiao Wei,Hua Xue,Yanhua Qi,Gaiping Zhang,Aiping Wang
Florfenicol (F), an antimicrobial agent exclusive to veterinary use within the chloramphenicol class, is extensively applied as a broad-spectrum remedy for animal diseases. Despite its efficacy, concerns arise over potential deleterious residues in animal-derived edibles, posing threats to human health. This study pioneers an innovative approach, introducing a quantum dot fluorescence-based immunoassay (FLISA) for the meticulous detection of F residues in animal-derived foods and feeds. This method demonstrates heightened sensitivity, with a detection limit of 0.3 ng/mL and a quantitative detection range of 0.6–30.4 ng/mL. Method validation, applied to diverse food sources, yields recoveries from 90.4 % to 109.7 %, featuring RSDs within 1.3 % to 8.7 %, the results showed high consistency with the national standard HPLC-MS/MS detection method. These findings underscore the method's accuracy and precision, positioning it as a promising tool for swift and reliable F residue detection, with substantial implications for fortifying food safety monitoring.
研究领域:
兽医学
·
食品安全
·
分析化学
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）