文献类型：期刊文献

英文题名：Griess reaction-based paper strip for colorimetric/fluorescent/SERS triple sensing of nitrite

作者：Li, Dan[1];Ma, Yadan[1];Duan, Huazhen[1];Deng, Wei[1];Li, Dawei[2,3]

机构：[1]Shanghai Inst Technol, Sch Chem & Environm Engn, 100 Haiguan Rd, Shanghai 201418, Peoples R China;[2]East China Univ Sci & Technol, Shanghai Key Lab Funct, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China

年份：2018

卷号：99

起止页码：389

外文期刊名：BIOSENSORS & BIOELECTRONICS

收录：;EI(收录号：20173604114453);WOS:【SCI-EXPANDED(收录号:WOS:000413284200054)】；

基金：This work was supported by the National Natural Science Foundation of China (21507089, 21174081, 21575041), the Shanghai University Young Teacher Training Program (ZZyy15095), the Shanghai Shuguang Program (16SG49), the Local Capacity Building Program (15120503600), the Scientific Research Foundation for the Introduction of Talent of Shanghai Institute of Technology (YJ2015-6), Shanghai Municipal Education Commission (Plateau Discipline Construction Program) and Shanghai Pujiang Program (17PJD010).

语种：英文

外文关键词：Griess reaction; Colorimetry; Fluorescence; Surface-enhanced Raman scattering (SERS); Nitrite

摘要：This study demonstrates a novel strategy for colorimetric/fluorescent/surface enhanced Raman scattering (SERS) triple-mode sensing of nitrite based on Griess reaction modulated gold nanorods (GNRs)-Azo-gold nanoparticles (GNPs) (GNRs-Azo-GNPs) assembly. The p-aminothiophenol (PATP)-capped GNRs (GNRs@ PATP) and 1,8-diaminonaphthalene (DAP)-modified GNPs (GNPs@DAP) are first synthesized through Au-S and Au-N bonds, respectively. Upon being excited at 365 nm, the dispersion of GNRs-GNPs (GNRs@PATP and GNPs@DAP) emits cyan fluorescence. Next, the addition of nitrite into the GNRs-GNPs induces the formation of GNRs-Azo-GNPs assembly, resulting in the enhancement of color and decrease of fluorescence. Therefore, the GNRs-Azo-GNPs assembly can not only be used as a naked-eye indicator of nitrite changed from orange yellow to purple, but also as a highly selective "fluorescence quenching" probe due to the fluorescence resonance energy transfer (FRET) between azo-moiety and DAP. The limit of detection (LOD) for nitrite is 0.05 mu M by colorimetry and 0.01 mu M by fluorescence. Meanwhile, the GNRs-Azo-GNPs assembly possesses controllable core satellites nanostructures and enables on-field SERS detection of nitrite with the LOD of 0.8 nM. More importantly, the GNRs-GNPs sensing system can not only be used as a paper-based test strip for on-site fast screening of nitrite with a high sensitivity and selectivity, but also as a SERS substrate for reliable quantitative analysis of nitrite. This study offers a new method for on-site visual detection of nitrite in human urine and meat products, as well as provides a strategy for designing multi-mode sensing platform for various applications.