Ethylene Glycol Chitin

• CAS: 9056-32-0
• Catalog Number: ACM9056320
• Category: Main Products
• Appearance: Lyophilisate

Case Study

Development of Glycol Chitin as a Novel Thermogelling Biomaterial

Li, Zhengzheng, et al. Carbohydrate polymers 92.2 (2013): 2267-2275.

Injectable, thermoresponsive hydrogels are highly desirable for applications in drug delivery and tissue engineering. Such materials need to be a liquid at room temperature for ease of administration but also form a stable gel at body temperature to provide localised, sustained release. Glycol chitin materials of defined degree of acetylation (DA) were prepared and characterised to establish a relationship between composition and performance. The polymer's DA, as well as the solution concentration and salt level, were used as control levers to tune the sol-gel transition temperature and degradation profile, so the material could be tailored for specific biomedical applications.
Application and Characterization
· Thermogelling Behavior: Aqueous solutions of glycol chitin demonstrated a reversible sol-gel transition, remaining free-flowing at room temperature and forming a durable gel rapidly at body temperature. The gelation temperature (ranging from 23°C to 72°C) could be finely tuned by adjusting the DA, polymer concentration, and salt content.
· Biocompatibility and Biodegradability: The polymer exhibited no significant cytotoxicity against human cell lines. Its degradation rate in the presence of lysozyme was controllable, with higher DA versions degrading faster.
· Drug Delivery Potential: As a proof of concept, the anti-cancer drug doxorubicin (DOX) was successfully incorporated into the glycol chitin hydrogel by simple mixing. The system subsequently provided sustained release of the drug over a period of 13 days.

Glycol Chitin as a Versatile Platform for a Multifunctional Biofilm-Eradicating Hydrogel

Abenojar, Eric C., et al. ACS infectious diseases 4.8 (2018): 1246-1256.

Bacterial biofilms present a major treatment barrier because their extracellular matrix impedes antibiotic penetration and shields resident cells. Combining matrix-disrupting agents with locally applied physical therapies offers a route to fully eradicate established biofilms. Glycol chitin was formulated here as an injectable, body-temperature gelling polymer to deliver d-amino acids (D-AAs) together with iron oxide magnetic nanoparticles (MNPs), enabling a two-step chemical + thermal biofilm disruption strategy.
Preparation: A magnetic glycol chitin hydrogel nanocomposite (MagDAA gel) was developed by: (a) synthesizing glycol chitin by controlled N-acetylation of glycol chitosan, (b) dissolving the polymer (optimized mass loading), (c) mixing in D-amino acids, and (d) incorporating clustered magnetic nanoparticles (c-MNPs) to enable magnetic heating. The system was tuned so that sol→gel transition occurs near body temperature, allowing minimally invasive delivery followed by in situ gelation.
Functional Performance
· Magnetic heating: Under alternating magnetic field stimulation, c-MNPs dispersed in water raised temperature much more (~25 °C increase) than when embedded in the 5% glycol chitin gel (~5 °C increase). The reduced heating in the gel was attributed to restricted Brownian rotation inside the viscous hydrogel matrix.
· Anti-biofilm efficacy: Using a two-step regimen - first sustained D-AA release from the gel to disrupt the biofilm matrix, then magnetic hyperthermia actuation - the MagDAA gel achieved complete in vitro eradication of Staphylococcus aureus biofilms that had resisted conventional antibiotics and that were not fully cleared by either D-AA treatment or magnetic hyperthermia alone.