the o-polysaccharide fraction obtained by mild acetic acid hydrolysis of the s. madelia lipopolysaccharide was analyzed by chemical composition , nitrous acid deamination , periodate oxidation , methylation , and 1h and 13c nuclear magnetic resonance methods and was demonstrated to be composed of three polysaccharides , ps ( i ) , ps ( ii ) , and ps ( iii ) , which had the structures of repeating oligosaccharide units : ( formula ; see text )
C0032594
polysaccharides
C0028959
oligosaccharide