PEG-grafted chitosan as an injectable thermoreversible hydrogel.

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Biomedical Engineering

Background:

• Chitosan is a biocompatible polymer with potential in biomedical applications.
• Developing injectable hydrogels that gel at body temperature is crucial for minimally invasive therapies.
• Thermosensitive polymers offer unique advantages for controlled drug release and tissue regeneration.

Purpose of the Study:

• To formulate and characterize PEG-grafted chitosan as an injectable, thermoreversible hydrogel.
• To assess its potential for safe incorporation of bioactive molecules at physiological pH.
• To explore its suitability for biomedical applications like drug delivery and tissue engineering.

Main Methods:

• Synthesis of polyethylene glycol (PEG)-grafted chitosan.
• Preparation of aqueous solutions at physiological pH.
• Evaluation of thermally reversed phase transition from solution to gel at body temperature.

Main Results:

• The PEG-grafted chitosan solution exhibits a phase transition from free-flowing liquid to a stable gel at body temperature.
• Aqueous solutions are stable at physiological pH, enabling bioactive molecule incorporation.
• The material demonstrates injectability at low temperatures and gelation at physiological conditions.

Conclusions:

• PEG-grafted chitosan forms an injectable, thermoreversible hydrogel suitable for biomedical use.
• This hydrogel system is promising for sustained in vivo drug release.
• The material holds potential for advanced tissue engineering applications.