Abstract

Starch-iodine colour (S.I.C.) units of α-amylase activity are re-defined. Two improved, alternative methods of calculating results are given, either (a) by a revised graphical procedure used in conjunction with a standard graph, or (b) by a graphical procedure using points calculated from the experimental results with an empirical equation using a programmed electronic calculator. Semiautomation of the measurement of starch-iodine colours usefully reduces the work load involved in this enzyme assay. Enzyme activities may be expressed in S.I.C. units, or as a rate of increase in reducing power.

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