16 research outputs found
Thermodynamic and FT-IR spectroscopic studies on heparin-polycation interaction
No full textPUPA surfaces are capable of adsorbing heparin because the basic nitrogens of poly(amido-amine), once protonated, electrostatically interact with the negative charges carried by the heparin molecule.
At first, the protonation behaviour of PUPA surfaces was investigated by thermodynamic and spectroscopic techniques. Then, the heparin polycation interaction was studied. Both sulphate and carboxyl groups of heparin are involved in the ionic binding if the heparinization is carried out at pH = 5·5, whereas only the former electrostatically interact at pH = 3·0.
A certain amount of heparin remained bound to the PUPA surfaces even at pH ∼ 11, emphasizing that strong bases are not able to destroy the ionic bond
Different protonation behaviour of two poly(methacrylic acid) derivatives containing N-acyl-glycine and N-acyl-b-alanine residues: thermodynamic and FT-IR studies
No full textAn insulin releasing system that is responsive to glucose: a thermodynamic evaluation of the permeability properties.
No full textThe thermodynamics of protonation and copper(II)-polyelectrolyte interactions on polyurethane and cellulose membranes
No full text'FT-IR and potentiometric study of basic polymer behaviour in the free form, in different bulks, both in solid state and aqueous solution
No full textThermodynamic and FT-IR spectroscopic study on the protonation and Cu(II) complex formation of polyelectrolytes grafted membranes
No full textVinyl polymers containing amido and carboxylic groups as side substituents. I. Synthesis of N-acryloyl-glycine and N-acryloyl-6-caproic acid and their grafting on cellulose membranes
No full textA comparative study of the thermodynamics of protonation of vinyl polymers containing amido and carboxylic groups as side substituents
No full textProximate composition and microbiological characterization of fresh mealworms (Tenebrio molitor L.)
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