Pepsin stock solution 100mLWorking Concentration - 10%pH range - 2 - 4.5Temperature range - 30 - 70°CSubstrate - Exposed film, skimmed milk or other protein suspensionsProduct - Peptides and AA'sIt’s good practice to store enzymes in a refrigerator (5°C approx). This should give a shelf life of 12 months without significant loss of activity.All enzymes, as supplied, should be considered as 100% (unless otherwise specified) e.g. Cellulase supplied as 2g powder 1g in 100mL gives a 1% working solution, or Pectinase supplied as 100mL - 1mL diluted to 100mL gives a 1% solution.pH - Recommended range for maximum activityTemperature - recommended range for maximum activityWorking Concentration - dilution of the Enzyme (as supplied) to this level should give an acceptable reation time.Substrate - substance to be reacted with the Enzyme, and appropriate concentrationProduct - substance produced by breakdown of the substrateSource - origin of the Enzyme