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Different actions of mono- and disaccharides on rat liver mitochondria.

Mitochondria, isolated with 0.3M disaccharide (sucrose, maltose, trehalose) solutions, showed significantly lower specific activities both in uncoupler-stimulated adenosinetriphosphatase and succinate dehydrogenase activities than organelles prepared in parallel from the same livers with isosomolar media based on mannitol, glucose or sorbitol. Furthermore, the glutamate content and the inulin impermeable space appeared markedly reduced by 0.3M disaccharides. These effects of the disaccharides were dependent on the concentration of the solute, and were not discernible at a concentration of 0.2M. On the basis of these results, one might suggest the avoidance of further use of sucrose in the preparation of liver mitochondria.