An inner filter effect based sensing system for the determination of caffeine in beverage samples

The Analyst ◽  
2020 ◽  
Vol 145 (6) ◽  
pp. 2279-2285 ◽  
Author(s):  
Natalia González ◽  
Sara P. Lantmann Corral ◽  
Graciela Zanini ◽  
Hernán Montejano ◽  
Carolina C. Acebal
Keyword(s):  
Inner Filter Effect ◽  
Beverage Samples ◽  
Sensing System ◽  
Filter Effect

A chemosensing system for the determination of caffeine in beverage samples using glibenclamide as a fluorophore.

UV-emitting polyelectrolyte-modified MoS2 quantum dots for selective determination of nitrophenol in water samples based on inner filter effect

2020 ◽  
Vol 98 (5) ◽  
pp. 222-227
Author(s):  
Keke Ning ◽  
Guoqiang Xiang ◽  
Cuicui Wang ◽  
Jingxing Wang ◽  
Xiaohong Qiao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Water Samples ◽  
Sodium Molybdate ◽  
Inner Filter Effect ◽  
Pond Water ◽  
Emission Peak ◽  
Selective Determination ◽  
Uv Emission ◽  
Filter Effect

In this work, poly(sodium 4-styrenesulfonate) (PSS) modified molybdenum disulfide quantum dots (MoS2-PSS QDs) were synthesized via a simple hydrothermal method using l-cysteine and anhydrous sodium molybdate as precursors and PSS as a modification reagent, and a selective and sensitive fluorescent sensing method for the determination of p-nitrophenol (p-NP) based on their UV emission was developed. The obtained MoS2-PSS QDs have an obvious UV emission peak (390 nm) with quantum yield of 5.13%. The strong absorption peak of p-NP at 400 nm has large spectral overlap with the UV emission peak (390 nm) of MoS2-PSS QDs. Because of this p-NP absorption, the fluorescence of MoS2-PSS QDs at 390 nm is quenched with the introduction of p-NP via the inner filter effect (IFE) and the decreased fluorescence intensity was linearly proportional to the p-NP concentration in the range of 1–20 μmol/L, leading to a detection limit of 0.13 μmol/L for p-NP. The MoS2 QDs-based fluorescent probe for p-NP is sensitive and selective and was successfully applied in the determination of p-NP in the pond water samples with satisfactory results.

Fluorescence-based measurements for the determination of nitrite using a coumarin derivative sensor based on inner filter effect

2020 ◽  
Vol 12 (8) ◽  
pp. 1107-1114 ◽  
Author(s):  
Xianfeng Wang ◽  
Jingzhou Hou ◽  
Xin Shen ◽  
Qiang He ◽  
Changjun Hou ◽  
...  
Keyword(s):  
Fluorescent Sensor ◽  
Inner Filter Effect ◽  
Coumarin Derivative ◽  
Filter Effect

Illustration of IFE-based fluorescent sensor for nitrite using coumarin derivative.

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