title: 4-O-(1-carboxyethyl)-L-rhamnose, a second unique acidic sugar found in an extracellular polysaccharide from Butyrivibrio fibrisolvens strain 49.
abstract: Butyrivibrio fibrisolvens strain 49 excretes a polysaccharide that contains D-glucose, D-galactose, 4-O-(1-carboxyethyl)-D-galactose, and an acidic component of previously unknown structure. We report here the identity of the unknown as 4-O-(1-carboxyethyl)-L-rhamnose. The structure of this previously unknown compound was deduced from (1) comprehensive electron-impact and chemical-ionization mass-spectroscopic studies of differentially labelled derivatives prepared from the unknown, (2) 13C-n.m.r. and 1H-n.m.r. studies of purified neutral sugars derived from the unknown and (3) chemical degradation experiments.
authors.affiliation: Northern Regional Research Center, U.S. Department of Agriculture, Peoria, IL 61604.
authors.forename: R J
authors.initials: RJ
authors.lastname: Stack
authors.forename: D
authors.initials: D
authors.lastname: Weisleder
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D005051:Eubacterium / Q000032:analysis*; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D011135:Polysaccharides, Bacterial / Q000032:analysis*; D012210:Rhamnose / Q000031:analogs & derivatives* / Q000032:analysis
chemical_list: D011135:Polysaccharides, Bacterial; C064736:4-O-(1-carboxyethyl)rhamnose; D012210:Rhamnose