Researchers at the University of Iceland used the Mya 4 Automated Reaction Station to develop a fast, efficient and highly controllable synthesis route for antibacterial chitosan derivatives.

Introduction

A research team from the Faculty of Pharmaceutical Sciences at the University of Iceland has published work demonstrating an efficient new synthesis method for antibacterial chitosan derivatives using the Radleys Mya 4 Automated Reaction Station.

The study focused on developing a rapid and controllable N-acylation method for producing quaternary chitosan derivatives with enhanced antibacterial activity. Using HATU coupling chemistry and a Design of Experiments (DoE) approach, the team successfully optimised reaction conditions to achieve predictable control over the degree of substitution (DS) while significantly reducing reaction time and reagent consumption.

Mya 4 Reaction Station Hero

Supporting Efficient Reaction Optimisation

The Mya 4 Reaction Station was used throughout the synthesis and optimisation work, enabling researchers to precisely control reaction temperature, stirring and inert atmosphere conditions during chitosan functionalisation studies.

Researchers used Mya 4 to:
• Solubilise chitosan under controlled heating and stirring conditions
• Perform HATU-mediated coupling reactions at 60 °C under nitrogen
• Investigate solvent compatibility and reagent solubility
• Execute multiple DoE optimisation experiments efficiently
• Develop one-pot synthesis procedures for multifunctional chitosan derivatives

The team reported that the optimised process enabled quantitative and predictable control of substitution levels using a streamlined one-pot approach.

Faster Route to Antibacterial Chitosan Derivatives

Compared with previously reported multistep synthetic routes, the new method substantially reduced reaction complexity and processing time. The researchers achieved synthesis of antibacterial chitosan derivatives within short reaction times while maintaining good reproducibility and control over final product properties.

The study also demonstrated successful synthesis of more complex dual-functionalised chitosan derivatives containing cinnamic acid, ferulic acid and phenylpropionic acid groups.

Antimicrobial testing confirmed that higher substitution levels correlated with improved antibacterial activity against Staphylococcus aureus, supporting the potential of these materials for biomedical applications.
Discover how the Mya 4 Reaction Station can support reaction optimisation, parallel synthesis and process development workflows.

Link to paper