Sweet Block Copolymer Nanoparticles: Preparation and Self-Assembly of Fully Oligosaccharide-Based Amphiphile

• Published in: Biomacromolecules Vol. 13; no. 4; pp. 1129 - 1135
• Main Authors: de Medeiros Modolon, Samuel, Otsuka, Issei, Fort, Sébastien, Minatti, Edson, Borsali, Redouane, Halila, Sami
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 09-04-2012
• Subjects: Aspergillus niger - enzymology; Biopolymers - chemistry; Biopolymers - metabolism; Carbohydrate Conformation; Chemical Sciences; Glucan 1,4-alpha-Glucosidase - chemistry; Glucan 1,4-alpha-Glucosidase - metabolism; Glucans - chemistry; Glucans - metabolism; Hydrolysis; Hydrophobic and Hydrophilic Interactions; Material chemistry; Micelles; Nanoparticles - chemistry; Oligosaccharides - chemical synthesis; Oligosaccharides - chemistry; Oligosaccharides - metabolism; Particle Size; Polymers; Surface Properties; Surface-Active Agents - chemical synthesis; Surface-Active Agents - chemistry; Surface-Active Agents - metabolism
• ISSN: 1525-7797; 1526-4602
• DOI: 10.1021/bm3000138

The preparation of biocompatible nanocarriers that have potential applications in the cosmetic and health industries is highly desired. The self-assembly of amphiphilic block copolymers displaying biosourced polysaccharides at the surface is one of the most promising approaches. In the continuity of our works related to the preparation of “hybrid” amphiphilic oligosaccharide-based block copolymers, we present here the design of a new generation of self-assembled nanoparticles composed entirely of oligosaccharide-based amphiphilic block co-oligomers (BCO). These systems are defined by a covalent linkage of the two saccharidic blocks through their reducing end units, resulting in a sweet “head-to-head” connection. As an example, we have prepared and studied a BCO in which the hydrophilic part is composed of a free maltoheptaosyl derivative clicked to a hydrophobic part composed of a peracetylated maltoheptaosyl derivative. This amphiphilic BCO self-assembles to form spherical micelles in water with an average diameter of 30 nm. The efficient enzymatic hydrolysis of the maltoheptaose that constitutes the shell of the micelles was followed by light scattering and colorimetric methods.