Abstract
Sugar-beet invertase preparation was found to be highly temperature-dependent in its activity (Topt = 40 °C), to be decreased by bivalent metal salts (especially CaCl2 and MgCl2 and relatively unaffected by heavy metal cations from the end of the periodic table. Inhibitors of SH groups, such as iodoacetamide andp-chloromercuribenzoate, were highly inhibitory while ouabain was a medium-strength inhibitor, with 2,4-dinitrophenol having no effect. The intracellular pH of 7.3, corresponding to the optimum for invertase (at 7.2) could be substantially decreased (to 5.8) by exposure of cells of whole sugar-beet roots to carbon dioxide in aqueous solution.
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