By Derek Horton

Considering its inception in 1945, this serial has supplied severe and integrating articles written by way of study experts that combine commercial, analytical, and technological features of biochemistry, natural chemistry, and instrumentation method within the research of carbohydrates. The articles supply a definitive interpretation of the present prestige and destiny tendencies in carbohydrate chemistry and biochemistry. top of the range accomplished reports masking all facets of carbohydrate chemistry

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108 Preparation. 163 Occurrence and preparation. 6-Deoxy-l-altrose (34) is a monosaccharide occurring rarely in Nature. 164 6-Deoxy-laltrofuranose is one of the constituent monosaccharides of an O-specific polysaccharide of Y. 30 A homopolymer of 6-deoxy-l-altrofuranose has been found in the LPS of Pectinatus frisingensis,166 which is in turn the source for the isolation of this sugar. 32 r. m. de lederkremer and c. gallo-rodriguez Occurrence. 167 Preparation. 168 Occurrence. 6-Deoxy-d-gulose (36) occurs in steroidal glycosides,160 for example, from the sap of the upas tree, Antiaris toxicaria,169 from the wallflower, Cheiranthus cheiri,170 and from Digitalis canariensis var.

226 Rhamnosides are mainly found in plant heteroglycans. For instance l-rhamnose is found in saponins227 from the bark of the Quillaja tree. 228 In bacteria, l-rhamnose may be found linked ␣ and ␤ in the same oligosaccharide chain, for instance in the capsular polysaccharide of Streptococcus pneumoniae229 and in the secreted polysaccharide of S. 232 The surface antigens of all serovars examined present the inner disaccharide ␣-l-rhamnopyranosyl(1→2)6-deoxy-␣-l-talopyranose. 233 Rhamnose has been described as a component of glycoproteins isolated from plants and microorganisms.

135 f. —Two ketohexoses are accessible in large quantities and are inexpensive: d-fructose and l-sorbose. 28 r. m. de lederkremer and c. gallo-rodriguez Occurrence. d-Fructose (29) is found, usually accompanied by sucrose, in uncombined form in fruit juices and honey. Apples and tomatoes are said to contain particularly large proportions of the sugar. When combined in natural products, the sugar is always found as the furanose. 137 The fructose units are joined to each other by ␤-(2→1) links and glucose residues may be linked to the end of the chain by an ␣-(1→2) linkage, as in sucrose.

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Advances in Carbohydrate Chemistry and Biochemistry, Vol. 59 by Derek Horton
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