1.3.3.5 chloroform chloroform-n-heptane mixture, preparations of enzyme lyophilized from N-(2-hydroxyethyl)-piperazine-N'-(3-propane-sulfonic acid) buffer suspended in 50:50 v/v chloroform-n-heptane mixture are activ if more than 0.081% v/v water are present in the two-phase system 391026 1.3.3.5 chloroform water-in-oil cetyltrimethyl ammonium bromide microemulsions of the enzyme, 60% of activity decay with a rate constant of 0.0183/min, 40% are lost at a rate constant of 0.000278/min 391027 1.3.3.5 n-heptane chloroform-n-heptane mixture, preparations of enzyme lyophilized from N-(2-hydroxyethyl)-piperazine-N'-(3-propane-sulfonic acid) buffer suspended in 50:50 v/v chloroform-n-heptane mixture are active if more than 0.081% v/v water are present in the two-phase system 391026 1.3.3.5 n-heptane water-in-oil cetyltrimethyl ammonium bromide microemulsions of the enzyme, 60% of activity decay with a rate constant of 0.0183/min, 40% are lost at a rate constant of 0.000278/min 391027