Abstract
Four α-glucosidases have been fractionated from sugar-beet cells. They are divisible into two groups in terms of soluble starch-hydrolysing activity. One group hydrolyses soluble starch at a faster rate than maltose. The enzymes of this group are not detected during the phase of starch accumulation in cells, but undergo a marked increase with the decrease of starch content. A possible role for these enzymes is in the metabolism of starch in the cell. Another group hydrolyses soluble starch only very weakly. The former group are highly active in the release of α-1,3-linked glucose from nigerose.
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