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A quantitative method to determine the points of O-(2-hydroxypropyl) substitution in O-(2-hydroxypropyl)-guar

✍ Scribed by Michael McNeil; Peter Albersheim

Publisher
Elsevier Science
Year
1984
Tongue
English
Weight
410 KB
Volume
131
Category
Article
ISSN
0008-6215

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✦ Synopsis

A method is described for locating the 0-(2-hydroxypropyl) groups in 0-(2hydroxypropyl)-substituted guar.

Per-0-methylation of the O-(Zhydroxypropyl)guar yielded guar that was partially 0-methylated and partially 0-(2methoxypropyl)ated.

This polymer was hydrolyzed, to afford a mixture of partially 0-methylated monosaccharides and partially 0-(2-methoxypropylated), partially 0-methylated monosaccharides. These monosaccharide derivatives were reduced, and the alditols acetylated, to give a mixture of partially 0-acetylated, partially Omethylated alditols with partially 0-acetylated, partially O-(Zmethoxypropyl)ated, partially 0-methylated alditols. These alditol derivatives were identified by gas-liquid chromatography-mass spectrometry, and quantitated by gasliquid chromatography.

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