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A Simple and Effective Method for Obtaining Aseptic Raw Beef Tissues 1.

Ajibola O Fapohunda1, Kenneth W McMILLIN1, Douglas L Marshall1

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A new aseptic technique using controlled heating effectively sterilizes beef surfaces, creating sterile samples for gnotoxenic studies and microbial ecology research.

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Area of Science:

  • Food Microbiology
  • Microbial Ecology
  • Gnotobiotic Research

Background:

  • Understanding beef microbial ecology is crucial for spoilage and pathogen control.
  • Existing methods for obtaining sterile beef samples have significant disadvantages.
  • Gnotoxenic studies require reliable methods for preparing microbe-free biological samples.

Purpose of the Study:

  • To develop a simple, rapid, and effective aseptic technique for preparing sterile beef samples.
  • To improve upon existing surface sterilization methods for muscle foods.
  • To facilitate gnotoxenic studies in beef by providing sterile sample material.

Main Methods:

  • A novel aseptic technique involving controlled heating of beef top round blocks at 232°C using an electric frier.
  • Aseptic removal of the cooked exterior layer (approximately 1 cm depth) to expose sterile interior tissue.
  • Validation of sterility through microbial analysis of processed samples.

Main Results:

  • The heating technique effectively destroyed surface microflora on beef samples.
  • Two trials yielded sterile samples in 95% and 90% of cases.
  • The method demonstrated high efficacy in producing microbe-free beef tissue.

Conclusions:

  • The described aseptic technique is a superior method for obtaining sterile beef samples.
  • This method is suitable for initiating gnotoxenic studies and investigating microbial ecology.
  • The technique shows potential applicability to other muscle food types, including fish.