Abstract
A series of methylhydroxypropylcellulose (MHPC) samples were prepared by different procedures and the distribution of methyl and hydroxypropyl substituents was determined by means of a 13C NMR analysis after the acetylation of both the unsubstituted hydroxyl groups on the anhydroglucose unit and those at the end of hydroxypropyl substituents. The methoxy methyl and the acetyl carbonyl signal analysis of acetylated MHPC samples allowed one to provide the detailed distribution pattern of two substituents and to correlate with the preparation procedure of the starting MHPC samples.
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