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.
Department of Food Science & Technology, Oregon State University, Corvallis, OR 97331-6602, USA.
Jooyeoun
J
Jung
Department of Food Science & Technology, Oregon State University, Corvallis, OR 97331-6602, USA. Electronic address: yanyun.zhao@oregonstate.edu.
Yanyun
Y
Zhao
D000042:Absorption; D000107:Acetylation; D000143:Acids / Q000737:chemistry; D000468:Alkalies / Q000737:chemistry; D000825:Animal Structures / Q000737:chemistry*; D000818:Animals; D002236:Carbohydrate Conformation; D005591:Chemical Fractionation; D002686:Chitin / Q000737:chemistry* / Q000302:isolation & purification; D049832:Decapodiformes / Q000737:chemistry*; D014867:Water / Q000032:analysis
D000143:Acids; D000468:Alkalies; D014867:Water; D002686:Chitin
Crystallinity; Deacetylating reaction; Jumbo squid pens; Moisture absorption ability; Structural modification; α-Chitin; β-Chitin