Abstract
In addition to a neutral glycan, lipopolysaccharide extracts from the reference strain for Serratia marcescens serogroup 022 contain an acidic polymer which probably defines the sergroup and is of microcapsular origin. The polymer is doubly branched with a heptasaccharide repeating unit and a galactan backbone. By means of spectroscopic and degradative studies, the structure of the repeating unit was established as that shown.
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