Isomaltose acetolysis

Definite proof that the interchain linkage is 6 —> 1-a-D has been obtained by Wolfrom and coworkers,91 who have isolated crystalline /3-isomaltose [6-0-(/3-D-glucopyranosyl)-D-glucose] octaacetate (in 1 % yield) from the mild acetolysis of waxy maize starch and have presented evidence that... 

Matsuda and coworkers studied first the acetolysis of isomaltose [a-D-(l—>6)] and nigerose [d-(W3)] the former was completely broken down, but the latter was not degraded. Use of the same conditions on several dextrans permitted them to isolate nigerose, proving the presence of (1— 3)-links, as well as kojiobiose [a-D-(l— 2)]. 

Five tetrasaccharides have been isolated from the acetolysis products of the insoluble dextran elaborated by Leuconostoc mesenteroides NRRL B-1299. Structural identification of the oligomers demonstrated that the (1 -> 3>-Hnl ed a-D-glucosyl residues occur in sequences, thus supporting the theory that there is a relationship between lower solubility and sequences of (1 - 3)-linked residues in the dextrans. A number of dextrans have been hydrolysed by an exu-isomaltohydrolase (EC 3.2.1.94) from Arthrobacter globiformis to produce, in addition to isomaltose, one or two pentasaccharides in which an a-i>glucosyl residue is substituted at 0-2,0-3, or 0-4 by an isomaltosyl unit. ... 

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