Biochemistry 461FS 2009Michigan State UniversityCarbohydrates - IIOctober 12, 2009Lecture 16Disaccharides and Oligosaccharides•Monosaccharides are covalently joined by an O-glycosidic bond•Hydroxyl group of one sugar reacts with the anomeric carbon of another sugar•Review -- what is the anomeric carbon?•This results in the conversion of a hemiacetal and/or hemiketalto an acetal/ketal2
has intentionally blurred sections.
Sign up to view the full version.
•Hemiacetal + hydroxyl: leaves one free reducingend.•Hemiacetal + hemiketal: yields a nonreducingsugar. •You are responsible for the general structures of lactose and sucrose.Disaccharides and Oligosaccharides3•20 or more monosaccharide units•Polysaccharides have a variety of functions:•Fuel storage•Structural elements•Homopolysaccharides vs. heteropolysaccharides•Branched vs. unbranchedPolysaccharides4