Abstract
Chitosan is a biocompatible, biodegradable, non-toxic, antibacterial, antioxidant, and antifungal natural polymer. In this study, chitin and chitosan were chemically isolated from the exoskeleton of invasive swimming crab Charybdis longicollis. In order to obtain the chitin, demineralization, deproteinization, and decolourization steps were applied to the samples. Chitosan was prepared from the isolated chitin by deacetylation at high temperatures. The chemical composition of chitin from C. longicollis was characterized by XRD and FTIR analysis. The yield of chitin extraction from dry crab shells was 25.78 %. The yield of chitosan produced from extracted chitin was 80.23 %. The experimental analyses revealed that the obtained chitin and chitosan could be used as biomaterial.
Highlights
The invasive swimming crab Charybdis longicollis Leene, 1938, is native to the Indian Ocean, the Persian Gulf, and the Red Sea and was first recorded from the Mediterranean Sea in Antalya and Mersin Bays in 1954 (Holthuis, 1961)
The first wide peak lies between 1229 and 1250 cm-1. This range corresponds to C=O, so this result is indicative of alpha chitin
The results indicate a system containing amino-polysaccharide alpha chitin alongside proteins
Summary
The invasive swimming crab Charybdis longicollis Leene, 1938, is native to the Indian Ocean, the Persian Gulf, and the Red Sea and was first recorded from the Mediterranean Sea in Antalya and Mersin Bays in 1954 (Holthuis, 1961). The population spread to Egypt and Greece in the Mediterranean and dominated to depths of 25 to 80 m (Innocenti & Galil, 2011). Sixty years after its first record in the Mediterranean, the population of C. longicollis seems durable, despite the high prevalence of its parasite and its damaging impacts, such as increased host mortality, sterilization, moulting prevention, and reduction of aggressive behaviour (Innocenti et al, 2003). Innocenti & Galil (2011) suggested that the crab’s high fecundity and the presence of parasite-free larger individuals, mainly in deeper waters, maintain its population Sixty years after its first record in the Mediterranean, the population of C. longicollis seems durable, despite the high prevalence of its parasite and its damaging impacts, such as increased host mortality, sterilization, moulting prevention, and reduction of aggressive behaviour (Innocenti et al, 2003). Innocenti & Galil (2011) suggested that the crab’s high fecundity and the presence of parasite-free larger individuals, mainly in deeper waters, maintain its population
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