Cellulose I spectra

The cellulose I spectra were also compared with spectra of ceTTulose II recorded from a mercerized ramie fiber. Figures 7 and 8 show the Raman spectra of these three celluloses. Spectra were recorded with the electric vector of the incident light parallel and perpendicular to the chain axis. These spectra can be divided into two regions. The region below 1600 cm (Figure 7) is most sensitive to the conformation of the cellulose backbone (especially below 700 cm" ). 

In our work CP/MAS C-NMR (Cross-Polarization Magic Angle Spurning Carbon-13 Nuclear Magnetic Resonance) spectroscopy togefiier wifii spectral fitting has been the method used for stud3dng interactions between cellulose I and hemicelluloses. A necessary prerequisite for this approach is a reliable interpretation of cellulose I spectra. 

The interpretation of cellulose I spectra is based on enriched cellulose I samples, i.e. some sample preparation is necessary before interpretable CP/MAS C-NMR spectra can be recorded on cellulose I. This is equally true for the samples where interactions between cellulose I rmd hemicelluloses are to be studied. The choice of sample preparation procedure may change the in vivo properties and the in vivo behavior of the polysaccharides to a varying extent. 

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