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Characterization of acidic groups in oxycelluloses. I. Identification of various functional groups
Author(s) -
Achwal W. B.,
Shanker Gouri
Publication year - 1972
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1972.070160715
Subject(s) - sodium borohydride , sodium carbonate , uronic acid , chemistry , methylene blue , chromatography , nuclear chemistry , color reaction , color difference , sodium , organic chemistry , polysaccharide , filter (signal processing) , photocatalysis , reagent , computer science , catalysis , computer vision
A large number of oxycelluloses were prepared and modified further by treatment with sodium borohydride as well as chlorous acid, and qualitative color tests were carried out to detect the presence of various functional groups. Uronic acid groups were found to be present in most of the samples. Enediol groups were not detected in any of the samples, although the samples after sodium carbonate treatment gave distinct color tests for enediols, indicating the presence of α‐hydroxymonoketo groups. Characteristic color tests for lactones were observed for most of the samples. The intensity of color developed in the lactone test was, however, found to decrease progressively on contact with a KI–KIO 3 mixture for various periods. The difference in the values of carboxyl content between the methylene blue method and the iodometric method is thus mainly caused by the opening of lactones in the latter method.