Highly sensitive turn-on fluorescent detection of cartap via a nonconjugated gold nanoparticle–quantum dot pair mediated by inner filter effect

RSC Advances ◽  
2014 ◽  
Vol 4 (52) ◽  
pp. 27228-27235 ◽  
Author(s):  
Jiajia Guo ◽  
Xin Liu ◽  
Hanting Gao ◽  
Jiaxin Bie ◽  
Yan Zhang ◽  
...  
Keyword(s):  
Absorption Band ◽  
Inner Filter Effect ◽  
Fluorescent Detection ◽  
Wavelength Band ◽  
Long Wavelength ◽  
Turn On ◽  
Highly Sensitive ◽  
Band Transition ◽  
Amine Groups ◽  
Positively Charged

The well-dispersed AuNPs exhibited a tendency to aggregate when exposed to cartap with positively charged amine groups, which induced an absorption band transition from 522 nm to the long-wavelength band, and restored the IFE-decreased emission of CdTe QDs for cartap detection.

Turn-on fluorescent detection of cyanide based on the inner filter effect of silver nanoparticles

The Analyst ◽  
2009 ◽  
Vol 134 (7) ◽  
pp. 1477 ◽  
Author(s):  
Li Shang ◽  
Chuanjiang Qin ◽  
Lihua Jin ◽  
Lixiang Wang ◽  
Shaojun Dong
Keyword(s):  
Silver Nanoparticles ◽  
Inner Filter Effect ◽  
Fluorescent Detection ◽  
Turn On ◽  
Filter Effect

scholarly journals Highly Sensitive and Selective Fluorescence “Turn-On” Detection of Pb (II) Based on Fe3O4@Au–FITC Nanocomposite

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3180
Author(s):  
Yina Cai ◽  
Binxue Ren ◽  
Chifang Peng ◽  
Cunzheng Zhang ◽  
Xinlin Wei
Keyword(s):  
Detection Limit ◽  
Lake Water ◽  
Fluorescent Detection ◽  
Fluorescence Recovery ◽  
Turn On ◽  
Fluorescent Method ◽  
Lake Water Sample ◽  
Highly Sensitive ◽  
Fluorescence Turn On ◽  
Optimized Conditions

New nanocomposites, Fe3O4@Au–FITC, were prepared and explored to develop a fluorescent detection of Pb2+. The Fe3O4@AuNPs–FITC nanocomposites could be etched by Pb2+ in the presence of Na2S2O3, leading to fluorescence recovery of FITC quenched by Fe3O4@Au nanocomposites. With the increase of Pb2+ concentration, the fluorescence recovery of Fe3O4@AuNPs–FITC increased gradually. Under optimized conditions, a detection limit of 5.2 nmol/L of Pb2+ with a linear range of 0.02–2.0 µmol/L were obtained. The assay demonstrated negligible response to common metal ions. Recoveries of 98.2–106.4% were obtained when this fluorescent method was applied in detecting Pb2+ spiked in a lake-water sample. The above results demonstrated the high potential of ion-induced nanomaterial etching in developing robust fluorescent assays.

A phenanthrene[9,10-d]imidazole-phenol-based fluorescent probe combined ESIPT and AIE for “turn-on” detection of Cu2+ with a green-emitting and improved stokes shift and its application

2021 ◽  
Author(s):  
Jiahui Du ◽  
Bing Zhao ◽  
Wei Kan ◽  
Haochun Yin ◽  
Tianshu Song ◽  
...  
Keyword(s):  
Fluorescent Probe ◽  
Stokes Shift ◽  
Fluorescent Sensors ◽  
Turn On ◽  
Highly Sensitive

Development of highly sensitive and selective fluorescent sensors toward Cu2+ has gained considerable attention in view of its application of environmental and biological fields. However, the strategy of sensing by...

scholarly journals Anchoring zinc-doped carbon dots on a paper-based chip for highly sensitive fluorescence detection of copper ions

The Analyst ◽  
2021 ◽  
Vol 146 (20) ◽  
pp. 6297-6305
Author(s):  
Qinglan Miao ◽  
Ji Qi ◽  
Yuanyuan Li ◽  
Xinxia Fan ◽  
Dongmei Deng ◽  
...  
Keyword(s):  
Fluorescence Detection ◽  
Carbon Dots ◽  
Active Sites ◽  
Copper Ions ◽  
Fluorescent Detection ◽  
Zn Doping ◽  
Highly Sensitive ◽  
Doped Carbon Dots

A novel paper-based chip that anchored zinc-doped carbon dots was constructed for sensitive and stable fluorescent detection of Cu2+. Zn doping increased the active sites for simplifying the modification of carbon dots.

scholarly journals Highly Sensitive Fluorescent Detection of Acetylcholine Based on the Enhanced Peroxidase-Like Activity of Histidine Coated Magnetic Nanoparticles

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1207
Author(s):  
Hong Jae Cheon ◽  
Quynh Huong Nguyen ◽  
Moon Il Kim
Keyword(s):  
Magnetic Nanoparticles ◽  
High Sensitivity ◽  
High Specificity ◽  
Choline Oxidase ◽  
Fluorescent Detection ◽  
One Pot ◽  
Site Structure ◽  
Specificity And Sensitivity ◽  
Highly Sensitive ◽  
Peroxidase Mimics

Inspired by the active site structure of natural horseradish peroxidase having iron as a pivotal element with coordinated histidine residues, we have developed histidine coated magnetic nanoparticles (His@MNPs) with relatively uniform and small sizes (less than 10 nm) through one-pot heat treatment. In comparison to pristine MNPs and other amino acid coated MNPs, His@MNPs exhibited a considerably enhanced peroxidase-imitating activity, approaching 10-fold higher in catalytic reactions. With the high activity, His@MNPs then were exploited to detect the important neurotransmitter acetylcholine. By coupling choline oxidase and acetylcholine esterase with His@MNPs as peroxidase mimics, target choline and acetylcholine were successfully detected via fluorescent mode with high specificity and sensitivity with the limits of detection down to 200 and 100 nM, respectively. The diagnostic capability of the method is demonstrated by analyzing acetylcholine in human blood serum. This study thus demonstrates the potential of utilizing His@MNPs as peroxidase-mimicking nanozymes for detecting important biological and clinical targets with high sensitivity and reliability.

A highly-sensitive “turn on” probe based on coumarin β-diketone for hydrazine detection in PBS and living cells

2021 ◽  
Vol 252 ◽  
pp. 119510
Author(s):  
Rui Chen ◽  
Guang-Jin Shi ◽  
Jia-Jia Wang ◽  
Hai-Feng Qin ◽  
Qi Zhang ◽  
...  
Keyword(s):  
Living Cells ◽  
Turn On ◽  
Highly Sensitive
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