A highly selective methacrylic based molecularly imprinted polymer (MIP) was synthesized and applied for the separation and the pre-concentration of salbutamol in urine samples. Spectrophotometric determination of salbutamol was achieved using 2,6-dichloroquinone chlorimide as colorimetric reagent. The detection limit of the method was ca. 13 ng mL in urine after pre-concentration of the sample...

In the decade since the discovery and mechanism of its formation, acrylamide levels have been monitored and reported for data gathering purposes by regulatory agencies. This note describes a simple cleanup procedure using solid phase extraction (SPE), coupled to GC/MS on an Agilent J&W VF-WAXms GC column, to measure low levels of acrylamide in newly introduced potato snacks processed using heat...

A method to determine alpha-, beta- and gamma-hexabromocyclododecane (HBCD) and tetrabromobisphenol A (TBBPA) in water and sediments was presented using solid phase extraction (SPE) and/or solvent extraction. Recoveries from sediments were approximately 100% for all the chemicals, while recoveries of alpha-, beta- and gamma-HBCDs from water were dependent on the extraction method. In the case o...

This work presents a comparative study of the analytical characteristics of two methods for the analysis of carbonyl compounds in wine, both based on the derivatization with O-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine hydrochloride (PFBHA). In the first method derivatives are formed in the solid phase extraction (SPE) cartridge in which the analytes have been previously isolated, while in the ...

In this study, on-line solid-phase extraction capillary liquid chromatography-mass spectrometry (SPE-CapLC-MS) and electrophoresis-mass (SPE-CE-MS) were compared for the analysis of opioid peptide biomarkers dynorphin A (1–7) (DynA), endomorphin 1 (End 1), methionine-enkephalin (Met). First, a (CapLC-MS) method was established, which allowed limits detection (LODs) 0.5 μg/mL Dyn Met, 0.1 End 1....

While this method gives acceptable performance, there are some important limitations which are dealt with in this study. Although an on-line procedure is convenient for some analysts, many prefer the off-line approach which gives a convenient extract in an organic Introduction The phenoxyacetic acid and other acidic herbicides are among the most widely used agrochemicals. Most of these compound...

A high-performance liquid chromatography (HPLC) analytical method for the determination of oxolinic acid and flumequine in Artemia nauplii is described. The samples were extracted and cleaned up by a solid-phase extraction (SPE) procedure using SPE C18 cartridges. Oxolinic acid and flumequine were determined by reversed-phase HPLC using a mobile phase of methanol-0.1 M phosphate buffer, pH 3 (4...

A fluorous cinchona alkaloid ester has been developed as a chiral promoter for the asymmetric fluorination of β-ketoesters. It has comparable reactivity and selectivity to the nonfluorous versions of cinchona alkaloids and can be easily recovered from the reaction mixture by simple fluorous solid-phase extraction (F-SPE) and used for the next round of reaction without further purification.

New materials have significant impact on development of new methods and instrumentation for chemical analysis. From the discovery of carbon nanotubes in 1991, single and multi-walled carbon nanotubes (SWCNTs and MWCNTs) -due to their high adsorption and desorption capacitieshave been employed as sorption substrates in solid-phase extraction for the preconcentration of heavy metals from diverse ...

the interaction between proteins and membranes has an important role in biological pro-cesses.we have calculated energies of interaction between melittin and dmpc bilayer in differenttemperatures. we have used the charmm software for md simulation under the canonical (n,v, e) ensemble at different temperatures. the computations have shown that water moleculeshave more penetration into the bilay...