| Title: | Encapsulation-release property of amphiphilic hyperbranched d-glucan as a unimolecular reverse micelle |
| Authors: | Kitajyo, Yoshikazu Browse this author |
| Imai, Tomoko Browse this author |
| Sakai, Yoko Browse this author |
| Tamaki, Masaki Browse this author |
| Tani, Hirofumi Browse this author →KAKEN DB |
| Takahashi, Kenji Browse this author |
| Narumi, Atsushi Browse this author |
| Kaga, Harumi Browse this author |
| Kaneko, Noriaki Browse this author |
| Satoh, Toshifumi Browse this author →KAKEN DB |
| Kakuchi, Toyoji Browse this author |
| Keywords: | Amphiphilic hyperbranched polymer |
| Unimolecular reverse micelle |
| Encapsulation |
| Issue Date: | 23-Feb-2007 |
| Publisher: | Elsevier |
| Journal Title: | Polymer |
| Volume: | 48 |
| Issue: | 5 |
| Start Page: | 1237 |
| End Page: | 1244 |
| Publisher DOI: | 10.1016/j.polymer.2007.01.028 |
| Abstract: | The synthesis of a novel unimolecular reverse micelle, the hyperbranched d-glucan carbamate (3), was accomplished through the carbamation reaction of the hyperbranched d-glucan (1) with the N-carbonyl l-leucine ethyl ester (2) in pyridine at 100 °C. Polymer 3 was soluble in a large variety of organic solvents, such as methanol, acetone, chloroform, and ethyl acetate, and insoluble in water, which remarkably differed from the solubility of 1. The degree of carbamate substitution (DS) for 3 was controlled by the feed rate of 2, and the DS values were in the range of 46.0–93.7%. Polymer 3 possessed the encapsulation ability for water-soluble molecules, such as rose bengal, thymol blue, and alizarin yellow in chloroform, and the encapsulation ability depended on the hydrophilicity of 3 and the molecular size of the dye. The rose bengal (RB) encapsulated polymer (RB/3) showed a slow release from the RB/3 system into water at neutral pH, while the release rate was significantly accelerated by the hydrolysis of the hydrophobic polymer shell under basic conditions. |
| Relation: | http://www.sciencedirect.com/science/journal/00323861 |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/22088 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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