Barry degradation

The methyl ethers are then separated and identified, for example by GLC. Unblocked positions must have been occupied by the glycosidic links. 

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In a modification of the Barry degradation,91,82 A/,A/-dimethylhydra-zine is used instead of phenylhydrazine. The advantages of the modified procedure were not actually stated, but it is conceivable that the milder conditions employed and less discoloration produced result in an improved yield of the degraded product. In one application, the glycerol glycoside 25 of a tetrasaccharide obtained on limited per-... 

Laminaran (built up essentially of /3-(l - 3)-linked D-glucose residues), when subjected to repeated Barry degradations, was only slightly de-polymerized, indicating that the small percentage of (1 —> 6)-linked residues present are either built in near the ends or as branching points along the chain. 

Degradation of beet arabinan and yeast mannan afforded osazones which, on hydrolysis in ethanolic solution with a cationic exchange resin in the acid state, yielded arabinose and a mannobiose, respectively, together with glycerosazone. These results, and also the nitrogen content of the polymeric materials recovered after Barry degradations, show that... 

Barry degradation, 79-81 Benzimidazoles, 5,6-dimethyl-l- (n-ribo-furanosyl)-, 116... 

The methods used for structural analysis of (4-0-methylglucurono)xylans have also been applied to the arabinogalactans from larch wood. They include methylation, partial hydrolysis, and Smith degradation. In addition, Barry degradation has found extensive use. Because of the few, detailed, structural investigations so far reported, and because of the complicated nature of the polysaccharides, each of the four species studied will be discussed separately. 

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