CELL 181 |
| In order to investigate the mechanism of the phase transition from cellulose I to IIII , complete assignments of CP/MAS 13C NMR spectra of IIII and I-EDA(Ethylenediamine) complex which is the intermediate of transformation from cellulose I to cellulose IIII were performed. For the assignments of the overlapped resonance lines arising from C2, C3 and C5 of IIII, 13C labeled cellulose was biosynthesized by Acetobacter xylinum from the culture medium containing D-(2-13C), D-(3-13C) or D-(5-13C) glucose as a carbon source. The intensity of the two equal carbons of the EDA molecule is nearly same as one carbon intensity of cellulose, which means that cellulose complex contains one EDA molecules per two glucose regidues. Also the spectrum of EDA complex is composed by clearly 6 singlet resonance lines, which suggests that the all glucose regidues of the complex are equivalent as cellulose IIII. |
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Structure and Properties of Cellulosic Polymers, Assemblies, and Nanocomposites
8:00 AM-11:45 AM, Tuesday, April 8, 2008 Morial Convention Center -- Rm. R07, Oral
Division of Cellulose & Renewable Materials |