Cellulose and chitosan are natural polymers that have been used as biocomposite. The aim of this research is to obtain biofilms from chitosan and oxidized cellulose crosslinks. This research is divided into three steps, i.e., isolation of cellulose from oil palm trunk and oxidation of cellulose using NaIO4 (0.2; 0.4; 0.6; 0.8; 1.0 mg/mL) to obtain dialdehyde cellulose (DAC), crosslink of oxidized cellulose with chitosan (DD = 72.85%) to obtain biofilm of chitosan/DAC (CDAC), and characterization of biofilms. The crosslinked reaction was confirmed by FT-IR analysis that showed the spectrum of Schiff base C=N group at 1651 cm–1. Tensile strength increased gradually when the NaIO4 concentration used was 0.2–0.6 mg/mL, but after those concentrations, the tensile strength slightly decreased. The morphology analysis showed that CDAC had smoother morphology than DAC, which was shown rough and showed some particle indicated the presence of unreacted cellulose. CDAC biofilms that prepared with 1.0 mg/mL NaIO4 showed the greatest antibacterial activity.

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Sorbitol has a low calorie value, this is due to the presence of a pair of O-H free electrons on the sorbitol molecule. The pair of free electrons can be removed by the Tunnel method (through the shadow of the sorbitol container). Sorbitol which has lost a pair of free electrons from the O-H group is called sorbitol switching. The instrument used to prove the release of a pair of free electrons in the O-H group is to use FTIR and clinical trials conducted on mice given sorbitol to prove the effectiveness between sorbitol and sorbitol switching. The results show that sorbitol switching is able to maintain the stability of blood sugar levels in the body of mice and can reduce blood sugar levels.

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