Gentiobiose from starch

It is usually separated as the octaacetate. The hydrogenation of hepta-0-acetylamygdalin 5) and the isolation of the octaacetate of gentiobiose, from the acetylated mother liquors ( hydro ) of the preparation of D-glu-cose from starch, have been suggested for the preparation of the disaccharide. The best method, however, is probably the synthetic method of Hel-ferich as modified by Reynolds and Evans and described below. Enzymic s3mthesis by the action of almond emulsin on D-glucose is also recommended 46). 

Extruded starches are easily dispersible, better soluble, and have a lower viscosity. The partial degradation of appropriately heated amylose shows that chemical changes also occur at temperatures of 185-200 °C. Apart from maltose, isomaltose, gentiobiose, sophorose, and 1,6-anhydroglucopyranose appeared. 

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