Encapsulation and In Vitro Controlled Release of Doxycycline in Temperature-Sensitive Hydrogel Composed of Polyethyleneglycol–polypeptide (L-Alanine-co-L-Aspartate)

Abstract:

Doxycycline was loaded with synthesized micelles composed of methyl Poly (ethylene glycol-block-poly (L-alanine–co–L-aspartate), or mPEG–Ala–Asp, and then characterized as a drug delivery carrier. The synthesis of the temperature-sensitive mPEG–Ala–Asp block copolymer was carried out by two-step ring-opening polymerization: firstly, the mPEG reacts with L-alanine N-carboxylic anhydride, and secondly the resulting mPEG–Ala reacts with benzyl aspartate N-carboxylic anhydride. The molecular structure of the copolymers obtained was determined by FT-IR and NMR spectroscopy methods and the micelles were characterized by SEM, TEM and DLS, respectively. The controlled release of Dox from hydrogel in the presence of PBS (8 to 9% by weight) lasts 6 to 7 days exhibiting stable release rates. The drug release mechanisms were studied: Higuchi and zero order models. The results and correlation coefficients applied to the Higuchi and zero-order models. The findings show the potential use of mPEG–Ala–Asp as an effective depot matrix to deliver anthracycline class drugs.

• Periodical: Journal of Biomimetics, Biomaterials and Biomedical Engineering (Volume 49)
• Pages: 119-129
• DOI: https://doi.org/10.4028/www.scientific.net/JBBBE.49.119
• Online since: February 2021
• Authors: Shamo Zokhrab Tapdiqov*
• Keywords: Alanine, Block Copolymer, Controlled Release, Doxycycline, Polyethyleneglycol, Sol-Gel Transitions

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