XRD measurements of crude chitin extracted from fish scales were
performed on a XPERT-PRO powder diffractometer (PANANALYTICAL) with CuKα radiation. The tube voltage was set at 40 kV, and the current was set at 30 mA with a wavelength of 1.54060 nm. The XRD diffraction patterns were taken over 11 min in the range of 10° to 60° at a scan speed of 0.0835°/s, the step size was 0.0021°.