An analytical method based on the use of UV-irradiation to produce fluorescent derivatives from Etofenprox a non-fluorescent pyrethroid insecticide is described. The impact of cetyltrimethylammonium chloride (CTAC) micellar medium on the Etofenprox photochemically-induced fluorescence (PIF) is reported. Parameters influencing the sensitivity and repeatability of the PIF method have been optimized. The alkaline medium (NaOH 6 × 10(-2) M) + CTAC surfactant molecules (3.84 mg/ml) in acetonitrile is found to be very suitable for this pyrethroid insecticide analysis in environment matrices. Linear dynamic range is established over more than two orders of magnitude. The limit of detection is lower than 5 ng/ml. The method seems to be suitable for environmental matrices quality control. Application to the analysis of spiked natural waters gave recoveries rate ranged from 94 to 104% and 107 to 115% respectively for river and pound water.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1007/s10895-010-0824-9 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
New buffer systems for photopainting of single biomolecules.
RSC Appl Interfaces
January 2024
School of Medical Engineering and Applied Social Sciences, University of Applied Sciences Upper Austria Garnisonstraße 21 4020 Linz Austria
We present newly developed buffer systems that significantly improve the efficiency of a photochemically induced surface modification at the single molecule level. Buffers with paramagnetic cations and radical oxygen promoting species facilitate laser-assisted protein adsorption by photobleaching (LAPAP) of single fluorescently labelled oligonucleotides or biotin onto multi-photon-lithography-structured 2D and 3D acrylate scaffolds. Single molecule fluorescence microscopy has been used to quantify photopainting efficiency.
View Article and Find Full Text PDFCyclodextrin-enhanced photo-induced fluorescence of -fluvalinate, molecular modelling of inclusion complexes and determination in natural waters.
Anal Methods
July 2024
Laboratoire OPTIMAG, Université de Bretagne Occidentale (UBO), 6 Av. Victor Le Gorgeu, 29285 Brest Cedex, France.
The effect of adding organized supramolecular systems such as β-cyclodextrin (β-CD) and hydroxypropyl-β-cyclodextrin (HP-β-CD) on the photochemically-induced fluorescence (PIF) spectral properties of -fluvalinate (TFV) in aqueous solutions was examined. The influence of pH, UV irradiation time and photoproduct stability on the cyclodextrin-enhanced photochemically-induced fluorescence intensity was also investigated. The spectral changes associated with the inclusion process yielded values for the formation constants of TFV inclusion complexes between 450 and 640 M, which were calculated using the nonlinear iterative regression approach least squares.
View Article and Find Full Text PDFSingle-Color Barcoding for Multiplexed Hydrogel Bead-Based Immunoassays.
ACS Appl Mater Interfaces
June 2022
Chemistry and Physics of Interfaces, Department of Microsystems Engineering - IMTEK, University of Freiburg, 79110 Freiburg, Germany.
Current developments in precision medicine require the simultaneous detection of an increasing number of biomarkers in heterogeneous, complex solutions, such as blood samples. To meet this need, immunoassays on barcoded hydrogel beads have been proposed, although the encoding and decoding of these barcodes is usually complex and/or resource-intensive. Herein, an efficient method for the fabrication of barcoded, functionalized hydrogel beads is presented.
View Article and Find Full Text PDFRole of Chiral Configuration in the Photoinduced Interaction of D- and L-Tryptophan with Optical Isomers of Ketoprofen in Linked Systems.
Int J Mol Sci
June 2021
Voevodsky Institute of Chemical Kinetics and Combustion, 630090 Novosibirsk, Russia.
The study of the L- and D-amino acid properties in proteins and peptides has attracted considerable attention in recent years, as the replacement of even one L-amino acid by its D-analogue due to aging of the body is resulted in a number of pathological conditions, including Alzheimer's and Parkinson's diseases. A recent trend is using short model systems to study the peculiarities of proteins with D-amino acids. In this report, the comparison of the excited states quenching of L- and D-tryptophan (Trp) in a model donor-acceptor dyad with ()- and ()-ketoprofen (KP-Trp) was carried out by photochemically induced dynamic nuclear polarization (CIDNP) and fluorescence spectroscopy.
View Article and Find Full Text PDFA General Method to Improve Fluorophores Using Deuterated Auxochromes.
JACS Au
May 2021
Janelia Research Campus, Howard Hughes Medical Institute, 19700 Helix Drive, Ashburn, Virginia 20147, United States.
Fluorescence microscopy relies on dyes that absorb and then emit photons. In addition to fluorescence, fluorophores can undergo photochemical processes that decrease quantum yield or result in spectral shifts and irreversible photobleaching. Chemical strategies that suppress these undesirable pathways-thereby increasing the brightness and photostability of fluorophores-are crucial for advancing the frontier of bioimaging.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!