scholarly journals Determination of the Influence of Various Factors on the Character of Surface Functionalization of Copper(I) and Copper(II) Oxide Nanosensors with Phenylboronic Acid Derivatives

Langmuir ◽  
2021 ◽  
Author(s):  
Edyta Proniewicz ◽  
Maria Starowicz ◽  
Yukihiro Ozaki
Keyword(s):  
Surface Functionalization ◽  
Phenylboronic Acid

Phenylboronic Acid Solid Phase Extraction Cleanup and Isotope Dilution Liquid Chromatography-Tandem Mass Spectrometry for the Determination of Florfenicol Amine in Fish Muscles

2015 ◽  
Vol 98 (3) ◽  
pp. 566-574 ◽  
Author(s):  
Della Wai-Mei Sin ◽  
Clare Ho ◽  
Yiu-Tung Wong
Keyword(s):  
Isotope Dilution ◽  
Solid Phase ◽  
Phenylboronic Acid ◽  
Accurate Determination ◽  
Internal Standard ◽  
Fish Muscles ◽  
Liquid Chromatography Tandem Mass ◽  
Cleanup Procedure ◽  
Acid Catalyzed

Abstract Florfenicol (FFC) residues in foods are regulated as the sum of florfenicol and its metabolites measured as florfenicol amine (FFA). An isotope dilution LC-MS/MS method utilizing phenylboronic acid (PBA) SPE cleanup is established for the accurate determination of FFA in fish muscles (i.e., salmon and tilapia) after acid catalyzed hydrolysis. Comparisons of the PBA SPE cleanup procedure with other cleanup procedures such as mixed-mode cationic (MCX) SPE and solid supported liquid–liquid extraction were performed. Quantification of FFA in fish muscles was accomplished by using matrix-matched calibration with FFA-D3 as the internal standard. The method was validated with FFA fortified fish muscles at three different levels (50, 100, and 200 μg/kg). Conversion of FFC to FFA by acid catalyzed hydrolysis was evaluated and found to be ≥88%. The recoveries of FFA in fish muscles at the three fortification levels ranged from 89 to 106%, and RSDs were ≤9% in all cases. The LOD values in salmon and tilapia muscles were 0.13 and 1.64 μg/kg, respectively. The LOQ values in salmon and tilapia muscles were 0.29 and 4.13 μg/kg, respectively. This method is suitable for the application in routine control of FFC in fishes according to its residue definition.

scholarly journals Determination of 3-Monochloropropanediol and Glycidol in Food Products

2022 ◽  
Vol 34 (2) ◽  
pp. 429-431
Author(s):  
A.I. Kozhushkevich ◽  
E.S. Kozeicheva ◽  
A.M. Lebedev ◽  
V.V. Ovcharenko ◽  
A.M. Kalantaenko
Keyword(s):  
Vegetable Oils ◽  
Milk Fat ◽  
Current Problem ◽  
Phenylboronic Acid ◽  
Food Products ◽  
Food Samples ◽  
Food Contaminants ◽  
Food Markets ◽  
New Challenges

Due to the increasing globalization of food markets, there are evolving new challenges for maintaing food safety. The current problem is the development of analytical methods for 3-monochloropropanediol ester and glycidol ester, which are food contaminants of concern for the scientific community. The levels of 3-monochloropropanediol ester and glycidol ester in certain food products are controlled by the European legislation. However, the maximum allowed concentrations and uptake limits for various food products are permanently revised. Therefore, we aimed to determine 3-monochloropropanediol ester and glycidol ester in various food products, which may contain vegetable oils. We analyzed food samples obtained from local food shops, predominantly low-priced products, which are more likely to contain vegetable oils, and adulterated milk fat. The levels of 3-monochloropropanediol ester and glycidol ester were determined indirectly by analyzing free 3-monochloropropanediol and glycidol ester obtained by hydrolysis and derivatized with phenylboronic acid. Samples were analyzed by GC-MS/MS on a triple-quad mass spectrometer.

A molecularly imprinted modified CdSeS/ZnS core–shell quantum dot embedded glass slide for highly selective and sensitive solid phase optosensing of trace amounts of lidocaine in biological samples

2019 ◽  
Vol 11 (6) ◽  
pp. 851-859 ◽  
Author(s):  
Hamidreza Ahmadpour ◽  
Seyed Mohamadreza Milani Hosseini
Keyword(s):  
Optical Properties ◽  
Surface Functionalization ◽  
Biological Samples ◽  
Solid Phase ◽  
Glass Slide ◽  
Selective Recognition ◽  
Core Shell ◽  
Imprinted Polymer ◽  
Molecularly Imprinted

An optosensing material based on surface functionalization of a glass slide with quantum dots (QDs) and molecularly imprinted polymer (glass slide@QDs@MIP) with unique optical properties of QDs and selective recognition of MIPs was fabricated for the determination of lidocaine in biological samples.

scholarly journals Surface Functionalization by Hydrophobin-EPSPS Fusion Protein Allows for the Fast and Simple Detection of Glyphosate

Biosensors ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 104 ◽  
Author(s):  
Julia Döring ◽  
David Rettke ◽  
Gerhard Rödel ◽  
Tilo Pompe ◽  
Kai Ostermann
Keyword(s):  
Surface Functionalization ◽  
Inorganic Phosphate ◽  
Surface Immobilization ◽  
Simple Method ◽  
New Approach ◽  
Simple Detection ◽  
Photometric Technique ◽  
Malachite Green Assay ◽  
Nanomolar Range

Glyphosate, the most widely used pesticide worldwide, is under debate due to its potentially cancerogenic effects and harmful influence on biodiversity and environment. Therefore, the detection of glyphosate in water, food or environmental probes is of high interest. Currently detection of glyphosate usually requires specialized, costly instruments, is labor intensive and time consuming. Here we present a fast and simple method to detect glyphosate in the nanomolar range based on the surface immobilization of glyphosate’s target enzyme 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS) via fusion to the hydrophobin Ccg2 and determination of enzyme activity with a malachite green assay, which is a common photometric technique to measure inorganic phosphate (Pi). The assay demonstrates a new approach for a fast and simple detection of pesticides.

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