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Microstructure of Antarctic Krill (Euphausia suberba) Cuticle
Yuanhuai Peng,Wei Ji,Hongwu Ji 한국해양과학기술원 2022 Ocean science journal Vol.57 No.2
In this study, the microstructure of Antarctic krill cuticle was deeply investigated using scanning electron microscope (SEM). The krill cuticles were treated with clean water, dilute hydrochloric acid solution and dilute sodium hydroxide solution to remove the adhesive substances, inorganic salts and protein, respectively. The organic substances were removed by sintering the cuticle in a muffle furnace to obtain the inorganic salts. The resulting cuticle of Antarctic krill was then observed under SEM and it was found that the cuticle has a hierarchical structure in which the α-crystal chitin fibers, with chitin spheres, extended from the pore canals, thus shaping layers; multiple stacked layers formed the three-dimensional structure; the inorganic salts were sparsely distributed in the cuticle; protein was wrapped around the surfaces of the chitin fiber bundles and the crystals of inorganic salts. These structural investigations revealed the interrelation among the main components of Antarctic krill cuticle. This study and following studies will be helpful in understanding the relationship between the forms of fluorine in Antarctic krill cuticle and its structural changes during postmortem storage.
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