Related Experiment Video
Updated: Jun 16, 2026

Microwave-assisted Functionalization of Polyethylene glycol and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation
Published on: October 30, 2013
Re-engineering chitin: From poor processability to functional hydrogels via ketone modification and dynamic
Rafael F N Quadrado1, Chisom Friday2, Atanur Satir3
1Laboratório de Tecnologia e Desenvolvimento de Compósitos e Materiais Poliméricos (LaCoPol), Federal University of Pelotas, 96010-900, Pelotas, RS, Brazil.
Abstract:
Chitin remains underutilized in hydrogel systems due to its low solubility and chemical inertness compared to its deacetylated derivative, chitosan. In this work, we report the design of a novel ketone-functionalized hydroxypropyl chitin (Ox-HPChit), obtained via selective oxidation using sodium hypochlorite, enabling dynamic covalent gelation through Schiff base formation with carboxymethyl chitosan (CMCs). This fully biopolymeric system forms injectable, self-healing hydrogels under mild conditions, without the need for synthetic crosslinkers or initiators. The optimized Ox-HPChit/CMCs hydrogel (Gel(1:2)) exhibited rapid gelation (24 min), high swelling capacity (2350%) and robust mechanical recovery, with over 85% of the storage modulus restored after high-strain cycles. Macroscopic injectability, as well as self-healing and adhesion to surfaces, were visually demonstrated. Furthermore, methotrexate-loaded hydrogels showed pH-responsive release, with 79.2% released at pH 5.5 after 24 h, due to the reversible nature of the imine crosslinks that form the hydrogel network. These findings demonstrate the successful development of a new functional chitin derivative and highlight its ability to act as a reactive precursor for dynamic, all-polysaccharide hydrogel networks formed via reversible imine chemistry. This work expands the chemical versatility of chitin and underscores its potential as a carbohydrate platform for the rational design of advanced polysaccharide-based materials, including drug delivery systems.
Related Concept Videos
Design Consideration
The factor of safety is another key aspect...
Design Example: Distributing Reinforcements in Concrete Sections
Design Example: Joints in Concrete Pavements
Contraction joints are typically formed by sawing a groove into the concrete shortly after it has hardened. This creates a weakened vertical plane, deliberately encouraging cracking at...
Design Example: Managing Concrete Workability
To address...
Design Example: Maintaining Level of an Embankment
Design Example: Designing Water Slide
Bernoulli's principle determines the water's velocity along the slide.

