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- Miyabayashi, Akiyoshi, et al.
(författare)
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A potentiometric enzyme electrode for monitoring in organic solvents
- 1989
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Ingår i: Analytica Chimica Acta. - 0003-2670. ; 219:C, s. 27-36
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Tidskriftsartikel (refereegranskat)abstract
- A potentiometric enzyme electrode is described for monitoring reactions in organic solvents. By use of an enzyme deposited on magnetic particles which are attracted to the tip of the electrode by means of a magnetic field, it is possible to produce an electrode in which the enzyme can easily be exchanged. As an example, studies of the chymotrypsin-catalyzed ester synthesis in diisopropyl ether and in toluene at varying water contents are reported. The results are consistent with those obtained from batch experiments. Operational behaviour and signal stability of the system makes this kind of potentiometric enzyme electrode attractive for monitoring bioorganic processes.
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- Bernhardsson, Bo, et al.
(författare)
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Solute transfer in on-line analytical flow-through dialyzers
- 1985
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Ingår i: Analytica Chimica Acta. - 1873-4324. ; 167, s. 111-122
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Tidskriftsartikel (refereegranskat)abstract
- Mass transfer in infinite parallel-plate dialyzers with co-flow between sample and detector streams is discussed for three different theoretical models. Analytical solutions with coupled diffusion and membrane transfer equations were obtained for plug flow in both channels. The finite-difference approximation method was used to obtain numerical solutions for a laminar-flow regime. Results obtained with a mixing-cup model under steady-state conditions were also included. With the dimensions typical for analytical dialyzers, there were only small differences between the laminar-flow and plug-flow models. The mixing-cup model predicted higher fluxes through the membrane than the other two models, particularly when the channel heights were increased. The theoretical results were compared with experimental results for dialysis of zinc(II) ions and the flow dependence agreed reasonably well with theory provided that the hydrostatic pressures were equal on both sides, and that stresses which could result in membrane bulging were kept low.Download full text in PDF
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- Stenström, Stig, et al.
(författare)
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The solubility of tri-n-octylamine in water and phosphoric acid solutions
- 1985
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Ingår i: Analytica Chimica Acta. - 1873-4324. ; 177, s. 279-284
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Tidskriftsartikel (refereegranskat)abstract
- The solubility of tri-n-octylamine (TOA) in water and phosphoric acid is reported. Equilibration is achieved by circulating the solutioin through PVC pieces saturated with the absorbed amine in a glass tube. The dissolved TOA is determined by capillary gas chromatography which can detect amine concentrations down to 10 μg l−1. The solubility of TOA in water is 0.039 mg l−1 and in 5.5 M phosphoric acid 0.82 mg l−1; these values are much lower than those reported in the literature.
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