Microchimica Acta
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Fluorescent assay of alkaline phosphatase activity via atom transfer radical polymerization
Microchimica Acta - Tập 189 - Trang 1-8 - 2022
A novel fluorescence assay is proposed through activators regenerated by electron transfer atom transfer radical polymerization (ARGET ATRP) strategy for alkaline phosphatase (ALP) activity detection. First of all, 2-bromo-2-methylpropionic acid (BMP) was employed as the initiator to modify on the surface of the magnetic nanoparticle (Fe3O4-MNP) by amide bonding. Then, ascorbic acid (AA) produced ......
Aptamer based test stripe for ultrasensitive detection of mercury(II) using a phenylene-ethynylene reagent on nanoporous silver as a chemiluminescence reagent
Microchimica Acta - Tập 181 - Trang 663-670 - 2014
We describe a paper-based chemiluminescence (CL) test for the determination of mercury(II) ion. A single-stranded DNA aptamer was first covalently immobilized via its amino groups to the hydroxy groups on the surface of cellulosic paper. The aptamer probes can capture Hg(II) ions due to their specific interaction with thymine. The CL reagent (a caboxylated phenylene-ethynylene referred to as P-aci......
Preconcentration and Recovery of Metal Ions by Donnan Dialysis
Microchimica Acta - Tập 153 - Trang 117-126 - 2005
Donnan dialysis has been demonstrated to be a useful technique for the preconcentration and recovery of metal ions. The chemical composition of both the sample and receiver solutions in terms of concentration and ionic compounds has a significant influence on the mass transfer efficiency. Illustrated by examples, approaches have been reviewed that can be used to obtain higher selectivity of metal ......
Application of Fe3O4@CNFs combined with deep eutectic solvent-based dual microextraction: a novel and green strategy for rapid determination of pesticides in edible oil samples
Microchimica Acta - Tập 189 - Trang 1-11 - 2022
A novel, green, and effective strategy employing Fe3O4-modified carbon nanofibers (CNFs) combined with deep eutectic solvent (DES) is proposed as an extraction agent to extract five pesticides in edible oil samples via dual microextraction modes, followed by high-performance liquid chromatography for determination. The Fe3O4@CNFs nanomaterial and a sequence of hydrophilic DES were prepared at firs......
Use of stainless steel absorption tubes for the semimicro carbon-hydrogen combustion
Microchimica Acta - Tập 38 - Trang 521-531 - 1951
A temporary shortage of soft glass absorption tubes made it necessary to see if stainless steel ones could not be substituted in the carbon-hydrogen semimicro combustion. It was also of interest to find out if metal tubes would exhibit any greater constancy of weight on the microbalance. This latter point concerns the future possibility of carbon-hydrogen ultramicro analysis where absorption tube ......
Coprecipitation of lead and cadmium using copper(II) mercaptobenzothiazole prior to flame atomic absorption spectrometric determination
Microchimica Acta - - 2007
Determination of caffeine in solid pharmaceutical samples by FTIR spectroscopy
Microchimica Acta - Tập 112 - Trang 87-98 - 1993
Fourier transform infrared spectroscopy has been used for the quantitative determination of caffeine in several pharmaceutical products: acetyl salicylic acid, paracetamol and propyphenazone. The method is simple, rapid and selective, and allows the determination of caffeine without sample pretreatment and without separation from the matrix. Two techniques for measuring the infrared spectra of caf......
Photometric and visual detection of Cr(VI) using gold nanoparticles modified with 1,5-diphenylcarbazide
Microchimica Acta - Tập 183 - Trang 1367-1373 - 2016
The authors report on a colorimetric method for the determination of Cr(VI) using gold nanoparticles (AuNPs) modified with the reagent 1,5-diphenylcarbazide (DPC). The detection scheme is based on the well-known redox reaction that occurs between DPC (on the AuNPs) and Cr(VI) ion, this followed by complexation between oxidized DPC and Cr(III). This complexation then triggers aggregation of the AuN......
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