Abstract
An accurate high field ( 1H at 600.13 MHz) 1D and 2D study was performed on an aqueous solution of carboxymethyl cellulose (CMC) sodium salt at 90°C. A combination of 2D experiments was used, 1H– 1H totally correlated spectroscopy TOCSY, and reverse detected 1H– 13C hetero-correlated spectroscopy HMQC with gradient selection. This combination allows a full assignment of 13C NMR spectra. From the gated decoupled 13C spectrum it is then possible to obtain not only the degree of substitution but also a good measure of the amount of esterification in each chemical position. Conductimetric titration supports the obtained results.
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