Alkali- or acid-induced changes in structure, moisture absorption ability and deacetylating reaction of β-chitin extracted from jumbo squid (Dosidicus gigas) pens.
Alkali- or acid-induced structural modifications in β-chitin from squid (Dosidicus gigas, d'Orbigny, 1835) pens and their moisture absorption ability (MAA) and deacetylating reaction were investigated and compared with α-chitin from shrimp shells. β-Chitin was converted into the α-form after 3h in 40% NaOH or 1-3 h in 40% HCl solution, and α-chitin obtained from NaOH treatment had higher MAA than had native α-chitin, due to polymorphic destructions. In contrast, induced α-chitin from acid treatment of β-chitin had few polymorphic modifications, showing no significant change (P>0.05) in MAA. β-Chitin was more susceptible to alkali deacetylation than was α-chitin, and required a lower concentration of NaOH and shorter reaction time. These results demonstrate that alkali- or acid-treated β-chitin retained high susceptibility toward solvents, which in turn resulted in good biological activity of β-chitosan for use as a natural antioxidant and antimicrobial substance or application as edible coatings and films for various food applications.
['Jung|Jooyeoun|J|', 'Zhao|Yanyun|Y|']
D000042:Absorption D000107:Acetylation D000143:Acids D000468:Alkalies D000825:Animal Structures D000818:Animals D002236:Carbohydrate Conformation D005591:Chemical Fractionation D002686:Chitin D049832:Decapodiformes D014867:Water
Moisture absorption ability Deacetylating reaction β-Chitin Structural modification α-Chitin Crystallinity Jumbo squid pens