Premium
Retention characteristics of water‐soluble compounds on water‐holding adsorbents with immobilized zwitterionic copolymers having different ionicities
Author(s) -
Kamichatani Waka,
Inoue Yoshinori,
Saito Mitsuru,
Kobayashi Yasuyuki,
Yamamoto Atsushi
Publication year - 2012
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.201200429
Subject(s) - copolymer , adsorption , chemistry , water soluble , chromatography , chemical engineering , organic chemistry , polymer , engineering
Three kinds of water‐holding adsorbents with immobilized zwitterionic copolymers having different cationic ionicities were synthesized. To investigate the influence of the charge balance and the ionicity of the cation site, the retention properties of the water‐soluble solutes on the zwitterionic adsorbents were measured by HPLC . These adsorbents had high water contents, and the hydrating water contents depended on the amounts of immobilized copolymer. The retentions of water‐soluble solutes depended on the hydrophilic interaction, and were in the order of log P o/w (logarithm of octanol–water partition coefficient). This suggests that the partition to the hydration layer was the main retention mechanism on the zwitterionic adsorbents. On the other hand, the electrostatic interaction based on the cation site on the adsorbents was also observed. The electrostatic interaction could be reduced by decreasing the ionicity of the cation sites. These results indicate that the retentions of the water‐soluble solutes on the zwitterionic adsorbents were greatly influenced by the ionicity of the cation sites on the adsorbents.