Structure of β-chitin from Berryteuthis magister and its transformation during whisker preparation and polymerization filling

High-Strength Nanostructured Film Based on β-Chitin Nanofibrils from Squid Illex argentinus Pens by 2,2,6,6-Tetramethylpiperidin-1-yl Oxyl-Mediated Reaction

“…Both A-ChNF and T-ChNF show the peak intensities at 2θ diffraction angles of 8.6 and 19.6°, respectively. The peaks correspond to those of the raw squid pen β-chitin published previously. , At the first peak intensity, 2θ = 8.6° diffraction angle corresponds to the Bragg reflection of the (010) planes. ,, At this angle, the β-chitin is in the monohydrated form . The second peak at 19.6° is from multiple crystal planes at (100) + (1–10) + (110) directions and is specific to the chitin crystal.…”

“…31 One of the most intense peaks at 002 reflections presented in the literature is absent. 7,32 Based on the 002 peak extracted from the two detector−wide-angle X-ray scattering (2D-WAXS) pattern of α-chitin fibril film (hit from the edges), 19 we found that the 002 peak is weak because of the out-of-plane fibril orientation. Our current data show that the β-chitin crystal structure is preserved.…”

“…16,31 At the first peak intensity, 2θ = 8.6°diffraction angle corresponds to the Bragg reflection of the (010) planes. 7,31,32 At this angle, the β-chitin is in the monohydrated form. 32 The second peak at 19.6°is from multiple crystal planes at (100) + (1−10) + (110) directions and is specific to the chitin crystal.…”

“…7,31,32 At this angle, the β-chitin is in the monohydrated form. 32 The second peak at 19.6°is from multiple crystal planes at (100) + (1−10) + (110) directions and is specific to the chitin crystal. A powdered sample (squid pen β-chitin) with better intensity reflection instead of a film presents the peaks at 9°and 20°, corresponding to both a raw squid pen and nanofibrils.…”

Fabrication, Characterization, and Evaluation of Bionanocomposites Based on Natural Polymers and Antibiotics for Wound Healing Applications

“…Chitin is a linear macromolecular structural component found within the cell walls of various microorganisms (yeasts and molds) [6,7,8,9]), exoskeleton of insects [10,11,12] and crustaceans [13,14,15,16]), and internal shells of cephalopods [17,18,19,20]. It is one of the most abundant naturally derived polysaccharides formed by the β (1 → 4) linkage of N -acetyl-2-amino-2-deoxy- d -glucose and 2-amino-2-deoxy- d -glucose monomeric units, which specifically provide chitin with a rigid and semi-crystalline fiber-like structure that is insoluble in water and other common solvents [21,22,23].…”