Abstract

Maximum amidolytic and esterolytic activities of crayfish hepatopancreatic trypsins occurred in a pH range of 7.5–8.5. Activity of trypsin A increased by addition of 0.5 mM of Ca 2+ ions; however, other trypsins were not affected by this concentration. Kinetic properties of crayfish trypsins toward esterolytic reaction were similar, but those for amidolytic reaction were different. Activation energies for esterolytic reaction were approximately 6.4–9.0 kcal/mole, while those for amidolytic reaction were between 5.9 and 6.9 kcal/mole.

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