Journal
CARBOHYDRATE POLYMERS
Volume 269, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2021.118332
Keywords
Chitin; Chitosan; Room temperature ionic liquid; Deep eutectic solvent; Functionalization; Fatty acid
Categories
Funding
- ministere de l'education nationale, de l'enseignement superieur et de la recherche
- Spanish MINEICO [IJCI201627789]
- regional government of Aragon [DGA T03_17R, DGAT03_20R]
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This study compares the impact of different pretreatment methods on the efficiency of chitin deacetylation from different sources, showing that IL pretreatment outperforms DES pretreatment in some aspects, ultimately validating that proper sources and processing methods can achieve high quality and highly functionalizable chitosan.
Chitin is mainly extracted from crustaceans, but this resource is seasonally dependent and can represent a major drawback to satisfy the traceability criterion for high valuable applications. Insect resources are valuable alternatives due to their lower mineral content. However, the deacetylation of chitin into chitosan is still an expensive process. Therefore, we herein compare the impact of both DES/IL-pretreatments on the efficiency of the chemical deacetylation of chitin carried out over two insect sources (Bombyx eri, BE and Hermetia illucens, HI) and shrimp shells (S). The results showed that chitosans obtained from IL-pretreated chitins from BE larva, present lower acetylation degrees (13-17%) than DES-pretreated samples (18-27%). A selective N-acylation reaction with oleic acid has also been performed on the purest and most deacetylated chitosans leading to high substitution degrees (up to 27%). The overall approach validates the proper chitin source and processing methodology to achieve high quality and highly functionalizable chitosan.
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