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Encapsulation-release property of amphiphilic hyperbranched d-glucan as a unimolecular reverse micelle

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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
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.
Type: article (author version)
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)

Submitter: 佐藤 敏文

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