l. The mechanical behaviour of crab shell is similar to that of prawn solid cuticle, especially in the occurrence of a low strain discontinuity in their bulk tensile stress-strain curves. 2. Although isolated crab chitin breaks in tension by the progressive failure of individual lamellae and exhibits post-fracture delamination, whole crab cuticle fails in an entirely brittle manner. 3. The mech...

Three chitinase isozymes, HoChiA, HoChiB, and HoChiC, were purified from the stomach of the greenling, Hexagrammos otakii, by ammonium sulfate fractionation, followed by column chromatography on Chitopearl Basic BL-03 and CM-Toyopearl 650S. The molecular masses and pIs of HoChiA, HoChiB, and HoChiC are 62 kDa and pH 5.7, 51 kDa and pH 7.6, and 47 kDa and pH 8.8, respectively. Substrate specific...

Abstract Chitin and its derived products have immense economic value due to their vital role in various biological activities as well biomedical industrial application. Insects, microorganism crustaceans are the main supply of chitin but shell like shrimp, krill, lobsters crabs commercial sources. content an individual varies depending on structures possessing polymer species. In this study edi...

Chitin nanoparticles are responsible for the outstanding mechanical properties found in exoskeletons of crustaceans and finding applications many scientific technological fields. Following a Circular Economy approach, diverse biomass wastes can be valorized to reintroduced back into economic cycle while preventing biowaste landfill upon isolation chitin nanoparticles. Novel environmentally sust...

Chitosan is an N-deacetylated biopolymer derivative of chitin (2-acetamido-2-deoxyβ-D-glucose through a β (1-4) linkage). The deacetylation is never complete. There is no specified nomenclature that describes the degree of deacetylation [1]. Chitin can be easily acquired from crab or shrimp shells. Its N-deacetylation is performed under alkali environment. The chitin that has been obtained from...

Marine pollution has increased in recent decades, largely due to the proliferation of seafood processing plants and improper disposal their associated waste streams. The streams consist mainly shells that are composed chitin, which is most abundant aminopolysaccharide biopolymer nature. Recognizing value potential for valorization crustacean chitin production was explored. In this regard, bioge...

The digestive physiology and stomach contents of six crab species from a variety of habitats were investigated to provide an indication of their digestive capability and dietary preferences. Stomach contents varied between species, but the key enzymes present were generally consistent with the types of dietary material being ingested. Nectocarcinus integrifons (red rock crab) consumed large qua...

The Clostridium paraputrificum chiB gene, encoding chitinase B (ChiB), consists of an open reading frame of 2,493 nucleotides and encodes 831 amino acids with a deduced molecular weight of 90,020. The deduced ChiB is a modular enzyme composed of a family 18 catalytic domain responsible for chitinase activity, two reiterated domains of unknown function, and a chitin-binding domain (CBD). The rei...