Multilayer adsorption of amino acids on oxidized cellulose
| Autor: | Dmitry S. Zimnitsky, Pavel M. Bychkovsky, T. L. Yurkshtovich |
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| Rok vydání: | 2005 |
| Předmět: |
Aqueous solution
Chemistry Inorganic chemistry Oxidized cellulose Cationic polymerization Degree of polymerization Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials Crystallinity chemistry.chemical_compound Colloid and Surface Chemistry Adsorption Polymerization Amino Acids Cellulose Oxidation-Reduction |
| Zdroj: | Journal of Colloid and Interface Science. 285:502-508 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/j.jcis.2004.12.021 |
| Popis: | The adsorption of amino acids (AA) (glycine, L-alanine, L-proline) on oxidized cellulose (OC) with various carboxyl contents and degrees of crystallinity from aqueous and water/ethanol solutions was studied. It was found that multilayer adsorption occurs in concentrated solutions of AA. It proceeds according to successive mechanisms via adsorption of AA zwitterions onto carboxyls of already adsorbed AA. This leads to formation of chain AA associates in the OC phase. A sharp increase in swelling accompanies multilayer adsorption. It was established that structural characteristics and degree of polymerization of OC are the main factors that affect multilayer adsorption. The distribution of carboxyls in the OC phase also plays an important role. Multilayer adsorption does not proceed in water/ethanol solutions and in the case of the cationic form of AA. |
| Databáze: | OpenAIRE |
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