132-135 °C (lit.)
H2O: 8 M
1.335 g/mL at 25 °C (lit.)
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Proteinase K (EC 184.108.40.206) activity can be measured spectrophotometrically using hemoglobin as the substrate. Proteinase K hydrolyzes hemoglobin denatured with urea, and liberates Folin-postive amino acids and peptides. One unit will hydrolyze hemoglobin to produce color equivalent to 1.0 μmol of tyrosine per minute at pH 7.5 at 37 °C (color by Folin & Ciocalteu's Phenol Reagent).
To standardize a procedure for the enzymatic assay of Urease, from Jack Beans