Search results for "facilitated transport"

showing 3 items of 3 documents

Transport of dipeptides and phosphono dipeptides through an immobilized liquid membrane. Stereoselectivity of the process

1993

Abstract Dipeptide and phosphono dipeptide hydrochlorides permeated well through a 1-decanol membrane supported in a porous polyethylene hollow fiber matrix. This transfer is easily accomplished either by passive or by carrier-facilitated (with Kryptofixes 222 or 5 present in the membrane phase) transport. The transport is stereoselective with l-l dipeptides being transported faster than their l-d isomers.

DipeptideFacilitated diffusionstereoselective transportFiltration and SeparationPolyethyleneBiochemistryCombinatorial chemistrysupported liquid membraneschemistry.chemical_compoundMembraneliquid membraneschemistryMass transferPhase (matter)Fiber matrixOrganic chemistryGeneral Materials ScienceStereoselectivityfacilitated transportPhysical and Theoretical ChemistryJournal of Membrane Science
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Factors influencing the transport of tryptophan hydrochloride through supported liquid membranes containing macrocyclic carriers

1997

Commercially available PTFE membranes were used as a support for liquid membranes in amino acid transport. Using tryptophan as a model amino acid, the influence of the type of organic liquid, kind of macrocyclic carrier and counter-ion on transport efficiency was examined. These studies show the strong influence of the kind of the counter-ion co-transported with amino acid cation, and the type of macrocyclic carrier used on the transport efficiency. The transport efficiency depends also on the pH of the source phase and on the nature of the organic liquid used as a membrane solvent. Liquid membranes supported on commercial porous-PTFE-membranes with hydrophobic solvents are stable for more …

chemistry.chemical_classificationamino acidsFacilitated diffusionHydrochlorideInorganic chemistryTryptophanFiltration and SeparationBiochemistrysupported liquid membranesAmino acidmembrane stabilitySolventPartition coefficientchemistry.chemical_compoundMembranechemistryOrganic chemistryGeneral Materials Sciencefacilitated transportPhysical and Theoretical ChemistryCounterionJournal of Membrane Science
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Transport of amino acids and their phosphonic acid analogues through supported liquid membranes containing macrocyclic carriers. Experimental paramet…

1991

Abstract Amino acid hydrochlorides are well transported through 1-decanol membranes containing Kryptofix 5 or 222 and supported in a porous polyacrylonitrile hollow fiber matrix. Factors which influence the transport of phenylalanine hydrochloride were studied in some detail using this sheet- as well as hollow fibre-supported liquid membranes. These studies show that the choice of the membrane phase, the kind of polymeric support and the mode of membrane preparation are of great importance for the efficiency of the process. The most vital step in the membrane preparation appears to be its activation by soaking in a solution of phenylalanine hydrochloride in a water-ethanol or water-propanol…

chemistry.chemical_classificationorganic separationsamino acid transportChemistryHydrochloridediffusiontechnology industry and agricultureIonophoreAqueous two-phase systemPolyacrylonitrileFiltration and SeparationPhenylalanineBiochemistryMembrane technologyAmino acidchemistry.chemical_compoundMembraneliquid membranePolymer chemistrymembrane carriersOrganic chemistryGeneral Materials Sciencefacilitated transportsupported liquid membranePhysical and Theoretical ChemistryJournal of Membrane Science
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