2 0 d l methionine 90 90 85with 0 25 l methionine 78 84 70with 0 50 l methionine 83 88 75with 1 0 l methionine 89 92 81with 2 0 l methionine 96 94 81with 1 0 d l methionine 67 74 60sulphoxidewith 2 0 l cysteine 60 67 57______________________________________ it appears from the data tabulated above that l methionine provides a better stabilization of the rennet preparation than the d l methionine l cysteine has no effect and d l methionine sulphoxide only a minor effect on the stability the stabilizing effect of d l methionine was tested in a 10 w w solution of a commercial mucor pusillus rennet nourylab 1 220 000 charge no 75 i 1 22 with 18 w w sodium chloride added for preservation the ph of the samples was adjusted to ph 4 7 a reference sample and a sample with 1 d l methionine were incubated at 40 u00b0 c 25 u00b0 c and 4 u00b0 c and residual coagulating activities were determined table v______________________________________10 w w nourylab percent residual activityincubation temp 40 u00b0 c 25 u00b0 c 4 u00b0 c 2 4 4 4 26incubation time weeks weeks weeks weeks weeks______________________________________reference without.