Multilayer adsorption of amino acids on oxidized cellulose

被引：20
|
作者：
Zimnitsky, DS [1 ]
Yurkshtovich, TL [1 ]
Bychkovsky, PM [1 ]
机构：
[1] Belarusian State Univ, Phys Chem Problems Res Inst, Minsk 220050, BELARUS
来源：
JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2005年 / 285卷 / 02期
关键词：
adsorption; amino acids; oxidized cellulose; multilayer; FT-IR; crystallinity; degree of polymerization;
D O I：
10.1016/j.jcis.2004.12.021
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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/ethariol solutions and in the case of the cationic form of AA. (c) 2004 Elsevier Inc. All rights reserved.
引用
收藏
页码：502 / 508
页数：7
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