Photosensor Activities of Cysteamine-Capped ZnS:Mn Nanocrystals in the Direct Detection of Nitrite Ions by Fluorescence Quenching in Aqueous Solutions

2018 ◽  
Vol 72 (3) ◽  
pp. 424-430
Author(s):  
Yujin Sim ◽  
Cheong-Soo Hwang
Keyword(s):  
Fluorescence Quenching ◽  
Aqueous Solutions ◽  
Direct Detection

Direct detection of Δ9-tetrahydrocannabinol in saliva using a novel homogeneous competitive immunoassay with fluorescence quenching

2010 ◽  
Vol 658 (2) ◽  
pp. 187-192 ◽  
Author(s):  
Chongxiao Tan ◽  
Nenad Gajovic-Eichelmann ◽  
Walter F.M. Stöcklein ◽  
Rainer Polzius ◽  
Frank F. Bier
Keyword(s):  
Fluorescence Quenching ◽  
Direct Detection ◽  
Competitive Immunoassay

Fluorescence quenching of tryptophan in aqueous solutions by pyruvate

1987 ◽  
Vol 47 (5) ◽  
pp. 1127-1131 ◽  
Author(s):  
G. A. Gachko ◽  
I. L. Zubko ◽  
V. K. Zybel't ◽  
L. N. Kivach ◽  
S. A. Maskevich ◽  
...  
Keyword(s):  
Fluorescence Quenching ◽  
Aqueous Solutions

scholarly journals Monitoring of Irinotecan in Human Plasma: Sensitive Fluorescent Nanogels by Molecular Imprinting

2019 ◽  
Author(s):  
Martina Tommasini ◽  
Elena Pellizzoni ◽  
Valentina Iacuzzi ◽  
Elena Marangon ◽  
Paola Posocco ◽  
...  
Keyword(s):  
Amino Acids ◽  
Fluorescence Quenching ◽  
Human Plasma ◽  
Molecular Imprinting ◽  
Plasma Sample ◽  
Direct Detection ◽  
Fluorescent Nanoparticles ◽  
High Dilution ◽  
Molecularly Imprinted

A series of fluorescent molecularly imprinted nanogels to detect irinotecan (CPT11) were prepared and characterized. A set of amino acids and napthalimide polymerisable derivatives allowed to obtain polymers as soluble fluorescent nanoparticles by high dilution imprinted synthesis. The direct detection of irinotecan in human plasma was obtained by fluorescence quenching of the naphtalimide-based imprinted materials. The plasma sample treated with acetonitrile allowed the detection of irinotecan in the 10nM – 30μM range. The LOD was 9.4 nM, with within-run variability 10% and day to day variability 13%.<br>

Enhanced nucleophile selectivity in the photoaddition to styrene. Comparison with the thermal addition

1988 ◽  
Vol 66 (9) ◽  
pp. 2412-2421 ◽  
Author(s):  
Steven W. Anderson ◽  
Keith Yates
Keyword(s):  
Acetic Acid ◽  
Fluorescence Quenching ◽  
Aqueous Solutions ◽  
Irradiation Time ◽  
The Other ◽  
Ring Substituent ◽  
Thermal Addition ◽  
Carbenium Ion ◽  
Medium Acidity

The reactivity–selectivity properties of the sec-phenethyl carbenium ion and its analogues have been examined in binary-aqueous solutions of alcohols (ROH; R = Me, Et, CF3CH2, n-Bu, t-Bu, n-Pr, i-Pr), acetic acid, and in solutions containing external nucleophiles such as thiophenol, ethanethiol, acetate, and benzenesulfinate. Selectivity (S = k(Nuc)/k(H2O)) is observed to be a function of the nucleophile, the ring substituent, thermal or photochemical conditions, irradiation time, and medium acidity. In the case of styrene, the photochemically generated (usually 254 nm, 1 h) species exhibits greater selectivity (up to two orders of magnitude) than its thermal counterpart, generated (usually 80 °C, 2−4 d) in identical media, particularly in aqueous-rich solvent compositions. A rationale for these differences, supported by fluorescence quenching experiments, and the other effects upon selectivity will be discussed.

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