The FTIR spectrum for chitosan NPs and chitosan NFs mixture is shown in Fig. 5(c). The spectrum is similar to chitin vibration patterns but with significant changes in the positions and intensities. The broad absorption band which appear in the range of 3600–2800 cm−1 can be related to collective absorption by both Nsingle bondH and Osingle bondH groups in the polymer. The broad absorption is a good indication for the strong hydrogen bonded intermolecular structure. The absorption peak at ∼1553 cm−1 in chitin has disappeared and two new peaks have emerged at 1652 cm−1 and 1597 cm−1 indicating successful deacetylation. The peak which appears at 1652 cm−1 can be assigned to amide I absorption and peak at 1597 cm−1 is due to the amide II functionality in the chitosan polymer. The degree of deacetylation of the sample was evaluated by the method proposed by Baxter, Dillon, Anthony Taylor, and Roberts (1992). Absorption ratio between peaks at 1652 cm−1 (amide I) and 3450 cm−1 is used to calculate the percent degree of deacetylation as follows: