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sample treatment
The errors introduced by the acylation of hydrogen peroxide with the carboxylic acid in the course of sample treatment with the enzyme were eliminated by adding diphenyl sulfide or dimethyl sulfoxide, which selectively reduced the peroxy acids.
      
The value of σM and its dependence on the electric (E) and magnetic (H) fields can be controlled by varying the density of dislocations and the mode of thermal sample treatment.
      
The quantitative aspects with connection of the use of "parking technique" are discussed and the sample treatment after irradiation is explained.
      
Theoretical considerations for zone electrophoretic sample treatment in liquid chromatography
      
The basis for this sample treatment method is free zone electrophoresis in a system of capillaries connected by switching valves.
      
A new valve for zone-electrophoretic sample treatment coupled on-line with high performance liquid chromatography
      
The design of a new valve arrangement for zone-electrophoretic sample treatment (ZEST) coupled online with high performance liquid chromatography is described.
      
The detection limits of quinidine and hydroquinidine (50 ng/ml), using zone-electrophoretic sample treatment coupled with column liquid chromatography, are in the same range as with direct injections using pre-columns.
      
Electrodialytic sample treatment coupled on-line with high-performance liquid chromatography
      
An electrodialytic sample treatment method coupled on-line with high-performance liquid chromatography (EDIST-HPLC) is discussed in this paper.
      
It is shown that the ITP sample treatment and the HPLC analysis step can easily be operated in an on-line mode, which greatly facilitates automation.
      
Serum sample treatment involves addition of internal standard (5-bromouracil), protein precipitation with saturated ammonium sulphate solution and liquid-liquid extraction with ethyl acetate-isopropanol (90 ∶ 10 v/v).
      
Zone electrophoretic sample treatment coupled on-line with column liquid chromatography for the determination of basic and acidi
      
A modified valve arrangement for zone-electrophoretic sample treatment (ZEST)-which is coupled on-line with column liquid chromatography - is used to pretreat biological (plasma) samples.
      
It was found that the sensitivity required must be considered when the solvent for sample treatment is selected.
      
Theoretical models for electrodialytic sample treatment in trace analysis by liquid chromatography
      
Basic considerations for analyte enrichment and recovery obtainable by electrodialysis as a sample treatment method are given.
      
About 10-fold enrichment can be obtained in an electrodialytic sample treatment system within 20 min under maximum current conditions.
      
Sample treatment only consisted of the extraction of retinol acetate content from capsules or tablets with methanol.
      
The method, which has the advantages of high sensitivity and selectivity, simple sample treatment and prompt production of results, has also been preliminarily adapted for pharmacokinetic study of tiopronin in urine.
      
 

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