Number Of Glucose Units Research Articles

Investigation of dialdehydocelluloses by means of infrared spectra

1. Dialdehydocellulose does not absorb in the region of 5.8μ, which is characteristic of C=O groups, and this confirms that the aldehyde groups in these preparations are in a changed state. 2. The intensity of the absorption at 11μ increases with an increase in the number of glucose units of the cellulose molecule oxidized to aldehydes. 3. The intensity of the absorption at 11μ decreases with the disappearance of the aldehyde groups as a result of their oxidation to carboxyl groups or as a result of treatment of the dialdehydocelluloses under conditions where gem-hydroxyls are methylated. 4. The facts listed indicate that the absorption band at 11μ should be assigned to symmetrical vibrations of the hemiacetal bond.