A confocal Raman microscopic visualization of small penetrants in cellulose acetate using a deuterium-labeling technique.

ABSTRACT: The purpose of the present study was to visualize the sorption dynamics of small compounds, such as propylene glycol (PG) in cellulose acetate (CA) film, by deuterium (d) labeling-aided confocal Raman spectroscopy (CRM). Substitution of hydrogen atoms in the target molecule with deuterium caused a marked shift of C-H bond-related Raman bands to low wavenumbers, while the number of deuterium did not affect the magnitude of the shift. Raman bands derived from the stretching vibration of C-H near 2900 cm^-1 for PG and ethanol were shifted to approximately 2100 cm^-1 for PG-d6 and ethanol-d5 in the silent region of the CA Raman spectrum. When PG-d6 was dissolved in glycerol triacetate (GTA), the observed Raman intensity ratio at 2123 cm^-1 of PG-d6 against 1739 cm

SUBMITTER: Kubota H 

PROVIDER: S-EPMC7532217 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature