Amphiphilic xylan–cholic acid conjugates: synthesis and self-assembly behaviors in aqueous solution
Tóm tắt
A novel amphiphilic biopolymer was synthesized by incorporating hydrophobic segment cholic acid (CA) into hydrophilic segment carboxymethyl xylan (CX) through coupling agent. Structural characteristics and self-assembly behaviors of the amphiphilic conjugates in aqueous solution were investigated in detail. Results showed that the conjugates provided monodispersed self-assembled micelles in distilled water, with average diameters in the range of 90–135 nm, depending on the DS of CA. TEM and AFM images proved that the self-assembly micelles were spherical. The micelles were covered with negatively charged carboxymethyl xylan shells, exhibiting zeta potential about − 38 mV. The aggregation concentration of the conjugate (0.0079–1.25 × 10−2 g/L) was closely related to the DS of CA and solution pH. Moreover, CX–CA nanoparticles were sensitive to the pH of release media. The cellular uptake of DOX-loaded CX–CA nanoparticles was better than that of free DOX, and thus CX–CA nanoparticles can be used as a new carrier for antitumor drug delivery.
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