Sterilization and Pasteurization

Documents:

• Correct pressure cooker use
  • 4.33
  
  
  Pressure cookers and canner are important tools in mycological work.
  
  
• What is "fractional sterilization" or tyndallization?
  • 3.50
  
  
  Fractional sterilization or tyndallization is a method used to destroy bacteria and endospores in preparation of grain spawn(rye, wheat, millet, birdseed.
  
  
• How do I pasteurize casing material in the microwave?
  • 3.00
  
  
  Using the microwave oven for pasteurisation of casings or dung substrates is effective and easy.
  
  
• Can I sterilize PF jars in the oven?
  • 3.00
  
  
  With oven sterilization similar problems arise as with the microwave: The heat conduction of dry air compared to steam (as in the pressure cooker and a covered pot of boiling water) is much smaller - therefor the sterilization time has to be longer -> this dries out the substrate.
  
  
• Why do I need 15psi when pressure cooking?
  • 2.00
  
  
  The reason for it is that at a pressure of 15 PSI (pound per square inch) water boils at a higher temperature (250°F, 121°C) than at ambient pressure.
  
  
• What is the difference between pasteurization and sterilization of casings and substrates?
  • 2.00
  
  
  The pasteurization is carried out for a prolonged time at around 170°F and is supposed to kill only heat susceptible organisms and their spores, while sterilization works at a temperature of 250°F and is supposed to kill all organisms.
  
  
• Can I stack jars in the pot or in the pressure cooker?
  • 2.00
  
  
  There is no problem with stacking the jars in the pot or in the pressure cooker, as long there is a lid on the pot.
  
  
• What is the "oven tek"?
  • 2.00
  
  
  The inoculations or culture transfers are done on a rack in front of a heated oven in the hot air that emerges the oven.
  
  
• Can I sterilize PF jars in my microwave?
  • 1.50
  
  
  People have reported variable success sterilizing jars prepared according to the PF -Tek in the microwave.
  
  
• Sterilize water before dunking?
  
  Do you have to sterilize the water before you dunk your cakes?
  
  
• Have I Made A Mistake
  
  wondering the safety of my jars.