Fig. 3.

Glycosyl linkage analysis of PttCesA8-synthesized cellulose. Gas chromatogram corresponding to the separated permethylated alditol acetates. The identity of the derivatives corresponding to 4-linked and terminal glucose was confirmed by electron-impact mass spectrometry (Fig. S2). All other peaks of the chromatogram, except for the peak marked with an asterisk, correspond to unidentified derivatives that are not alditol acetates, as evidenced by the corresponding fragmentation data. The peak marked with an asterisk corresponds to 4-linked xylose, a known instrument contamination at the time of analysis.