Influence of chitin purity on its dissolution behaviour in alkaline solvent

Area of Science:

• Biopolymer Science
• Materials Science
• Biotechnology

Background:

• Chitin, a strong biopolymer, shows potential for bioplastics.
• Chitin isolation from biomass is complex, involving removal of minerals, proteins, and pigments.
• Chitin's recalcitrance poses challenges for dissolution, a necessary step for processing.

Purpose of the Study:

• To investigate the cryo-assisted dissolution of Northern pink shrimp (P. borealis) chitin using potassium hydroxide (KOH).
• To evaluate the influence of residual impurities on chitin dissolution behavior.
• To compare dissolution characteristics of chitin samples with varying purity levels (84-97% w/w).

Main Methods:

• Chitin samples of different purities were prepared from Northern pink shrimp.
• Cryo-assisted dissolution using KOH solvent was employed.
• Microscopic analysis was used to examine chitin particles and identify insoluble components.

Main Results:

• Chitin with lower purity (down to 84% w/w) was successfully dissolved in KOH, provided minerals were removed.
• Dissolution behavior and physical properties varied significantly between chitin samples of different purities.
• Microscopic analysis revealed exoskeleton features and insoluble particles, offering insights into dissolution.

Conclusions:

• Successful dissolution of impure chitin is achievable with KOH, highlighting the importance of mineral removal.
• Residual impurities and exoskeleton structures influence chitin's dissolution behavior and final properties.
• Microscopic insights can guide future improvements in chitin dissolution processes for bioplastic applications.