My watch list  

Hydrogen-Bonding-Induced Chain Folding and Vesicular Assembly of an Amphiphilic Polyurethane

We have reported synthesis and vesicular assembly of a novel amphiphilic polyurethane with hydrophobic backbone and hydrophilic pendant carboxylic acid groups which were periodically grafted to the backbone via a tertiary amine group. In aqueous medium the polymer chain adopted a folded conformation which was stabilized by intrachain H-bonding among the urethane groups. Such a model was supported by concentration and solvent-dependent FT-IR, powder XRD, and urea-mediated “denaturation” experiments. Folded polymer chains further formed vesicular assembly which was probed by dynamic light scattering, TEM, AFM, SEM, and fluorescence microscopic studies, and dye encapsulation experiments. pH-dependent DLS and fluorescence microscopic studies revealed stable polymersome in entire tested pH window of 3.5–11.0. Zeta potential measurements showed a negatively charged surface in basic pH while a charge-neutral surface in neutral and acidic pH. MTT assay with CHO cell line indicated good cell viability.

Authors:   Tathagata Mondal; Krishna Dan; Jolly Deb; Siddhartha S. Jana; Suhrit Ghosh
Journal:   Langmuir
Year:   2013
DOI:   10.1021/la401008y
Publication date:   22-May-2013
Facts, background information, dossiers
More about American Chemical Society Publications
Your browser is not current. Microsoft Internet Explorer 6.0 does not support some functions on Chemie.DE