NDLI: Critical re-investigation of the alditol acetate method for analysis of substituent distribution in methyl cellulose

Content Provider	Springer Nature Link
Author	Voiges, Kristin Adden, Roland Rinken, Marian Mischnick, Petra
Copyright Year	2012
Abstract	The alditol acetate method is a common procedure for sugar analysis, also applied to determine the substituent distribution in monomer units of polysaccharide ethers like methyl cellulose by gas liquid chromatography. Consisting of several preparation and work-up steps this procedure is both time consuming and prone to side reactions that promote discrimination of single constituents, especially when no peralkylation step is performed prior to hydrolysis. As a consequence results scatter in dependence on individual treatment and conditions. In the context of this work these critical points were overcome by strict but simplified work-up procedures and using acid instead of alkaline catalyzed acetylation. Under the acidic conditions the tedious removal of borate is no longer necessary and a reduced time requirement was achieved as well as good reproducibility. Comparison with independent reference methods excluded a systematic error of the method and confirmed the results obtained. Without peralkylation, i.e. in the presence of free hydroxyl groups, another fast modification of the method using DMSO as solvent, no removal of borate, and 1-methylimidazole as catalyst for acetylation was found to produce a systematic error.
Starting Page	993
Ending Page	1004
Page Count	12
File Format	PDF
ISSN	09690239
Journal	Cellulose
Volume Number	19
Issue Number	3
e-ISSN	1572882X
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-02-15
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Alditol acetate method Monomer analysis Methyl cellulose Substituent distribution Gas liquid chromatography Physical Chemistry Organic Chemistry Polymer Sciences Bioorganic Chemistry
Content Type	Text
Resource Type	Article
Subject	Polymers and Plastics

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