Microbial Growth and Its Control - General Principles and Growth Control by Heat

6 important questions on Microbial Growth and Its Control - General Principles and Growth Control by Heat

What are the types of physical microbial growth control?

  • Heat
  • Radiation
  • Filtration

What is the difference between sterilization and pasteurization?

Sterilization is at 121 degrees Celsius for 15 min (standard method). Pasteurization is at 71 degrees Celsius for 15 sec.

What is an advantage of pasteurization compared to sterilization?

Taste changes less, for example with milk.
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What is a drawback of pasteurization compared to sterilization?

It will not be sterile, cells and bacterial spores can survive.

Why is steam more effective than dry heat?

Steam is more effective due to the release of condensation energy. Dry heat would need a higher T.

Why are bacterial spores very heat resistance? And what is the solution?

Bacterial spores are very heat resistance because of a low water content, Ca2+-dipicolinate accumulation, and special proteins.
The solution is to sterilize at 180 degrees Celsius for 3 hours, or by doing tyndallisation.

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