Hofmeister series:: The hydrolytic activity of Aspergillus niger lipase depends on specific anion effects

The specific activity of lipase A (Aspergillus niger) toward the hydrolysis of p-nitrophenyt acetate (p-NPA) is shown to increase as a result of sodium salt addition according to specific ion effects of the Hofmeister series. This shows explicitly that the Hofmeister effect is due to the different specific interactions between anions and the enzymatic surface.