Search results for " polyacrylic acid"

showing 3 items of 3 documents

Uranium(VI) sequestration by polyacrylic and fulvic acids in aqueous solution

2011

Stability data on the formation of dioxouranium(VI) species with polyacrylic (PAA) and fulvic acids (FA) are reported with the aim to define quantitatively the sequestering capacity of these high molecular weight synthetic and naturally occurring ligands toward uranium(VI), in aqueous solution. Investigations were carried out at t = 25 °C in NaCl medium at different ionic strengths and in absence of supporting electrolyte for uranyl–fulvate (\( {{\text{UO}}_{2}}^{2+} \)–FA) and uranyl–polyacrylate (\( {{\text{UO}}_{ 2}}^{ 2+ } \)–PAA, PAA MW 2 kDa) systems, respectively. The experimental data are consistent with the following speciation models for the two systems investigated: (i) UO2(FA1),…

Aqueous solutionSupporting electrolyteLigandHealth Toxicology and MutagenesisDioxouranium(VI) cation Uranium sequestration Uranyl–polycarboxylate interactions Fulvic acid Polyacrylic acid Metal complexes in aqueous solutionPolyacrylic acidPublic Health Environmental and Occupational Healthchemistry.chemical_elementIonic bondingUraniumUranylPollutionAnalytical ChemistryIonchemistry.chemical_compoundNuclear Energy and EngineeringchemistryPhysical chemistryRadiology Nuclear Medicine and imagingSettore CHIM/01 - Chimica AnaliticaSpectroscopyNuclear chemistry
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Transbuccal tablets of carbamazepine: formulation, release and absorption pattern.

2006

Tranbsuccal drug administration is an attractive method, as it has several advantages especially with respect to peroral delivery. Here we report: i) the aptitude of carbamazepine (CBZ) to penetrate porcine buccal mucosa and reconstituted human oral (RHO) epithelium; ii) three different tablet formulations for transbuccal administration; iii) the drug release rate from tablets. CBZ permeation through the buccal mucosa was investigated by using two different bi-compartmental open models: Franz cells for porcine buccal mucosa and Transwell diffusion cells system for RHO epithelium. Results, expressed as drug flux (Js) and permeability coefficients (Kp), indicated that CBZ well penetrates the …

CarbamazepineCheekSolubilitySwineSettore CHIM/09 - Farmaceutico Tecnologico ApplicativoChemistry PharmaceuticalSettore MED/50 - Scienze Tecniche Mediche ApplicateMouth MucosaAdministration BuccalAnimalsbuccal permeation modelling transbuccal drug delivery carbamazepine polyacrylic acid microspheres tablets matrices tabletsAbsorptionTablets
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Sequestration of biogenic amines by alginic and fulvic acids.

2006

The interaction of natural (alginic and fulvic acids) and synthetic (polyacrylic acid 2.0 kDa) polyelectrolytes with some protonated polyamines [diamines: ethylendiamine, 1,4-diaminobutane (or putrescine), 1,5-diaminopentane (or cadaverine); triamines: N-(3-aminopropyl)-1,4diaminobutane (or spermidine), diethylenetriamine; tetramine: N.N'-bis(3-aminopropyl)-1,4-diaminobutane (or spermine); pentamine: tetraethylene-pentamine; hexamine: pentaethylenehexamine] was studied at T=25 degrees C by potentiometry and calorimetry. Measurements were performed without supporting electrolyte, in order to avoid interference, and results were reported at I=0 mol L(-1). For all the systems, the formation of…

polyammonium-polycarboxylate interactionsAlginatesPolymersBiogenic aminesInorganic chemistryFulvic acidCarboxylic AcidsBiophysicsProtonationCalorimetryBiochemistryMedicinal chemistryElectrolyteschemistry.chemical_compoundbiogenic amineGlucuronic AcidPolyaminesBenzopyransAlginic acidPolyacrylic acidCadaverineChemistryHexuronic AcidsOrganic ChemistryPolyacrylic acidPentaminesequestrationPolyelectrolytesPolyelectrolyteQuaternary Ammonium CompoundsBiogenic amines; Fulvic acid; Alginic acid; Polyacrylic acid; sequestrationModels ChemicalDiethylenetriamineThermodynamicsAmine gas treatingProtonsMathematics
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