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A new laboratory system achieved effective milk sterilization using indirect ultrahigh-temperature (UHT) processing with precise temperature and time control. This method ensures milk safety through controlled heating and rapid cooling.

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Area of Science:

  • Food Science and Technology
  • Chemical Engineering
  • Materials Science

Background:

  • Traditional milk pasteurization methods may not eliminate all microorganisms.
  • Ultrahigh-temperature (UHT) processing offers enhanced microbial inactivation but requires precise control.

Purpose of the Study:

  • To design and evaluate a laboratory-scale indirect ultrahigh-temperature (UHT) system for milk sterilization.
  • To assess the effectiveness of controlled temperature and time in UHT milk processing.

Main Methods:

  • Constructed a stainless steel tubing system for indirect heating of milk.
  • Utilized nitrogen gas at 80 psi to propel milk through preheating, sterilization, and holding stages.
  • Implemented rapid cooling in an ice-water bath and aseptic collection.

Main Results:

  • The system effectively sterilized milk under controlled conditions.
  • Stainless steel tubing served as an effective barrier between the heating agent and milk.
  • Aseptic collection ensured product integrity post-sterilization.

Conclusions:

  • The developed laboratory-scale UHT system is effective for milk sterilization.
  • Precise control over temperature and time is crucial for successful UHT processing.
  • Indirect heating via stainless steel offers a viable method for UHT milk treatment.