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Related Experiment Videos

Microbial barrier properties of hen egg shells.

T Haigh1, W B Betts

  • 1Institute for Applied Biology, University of York, Heslington, Great Britain.

Microbios
|January 1, 1991
PubMed
Summary

Eggshell porosity, particularly in white eggs, allows bacterial contamination. The blunt pole of the egg is more susceptible to bacterial entry, impacting food safety.

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Area of Science:

  • Poultry Science
  • Microbiology
  • Materials Science

Background:

  • Eggshells possess a porous structure that influences gas exchange and microbial barrier properties.
  • Variations in eggshell color (brown vs. white) may correlate with differences in porosity.
  • The cuticle layer and inner shell membranes contribute to the egg's defense against microbial invasion.

Purpose of the Study:

  • To investigate the porosity of brown and white eggshells using scanning electron microscopy.
  • To assess the barrier function of eggshells and membranes against bacterial penetration.
  • To determine the influence of eggshell porosity on microbial contamination.

Main Methods:

  • Scanning electron microscopy (SEM) was used to visualize and quantify eggshell pore structure.
  • Concentrated nitric acid was employed for partial cuticle removal and surface etching.
  • Egg contents were replaced with nutrient agar, and whole eggs were incubated in bacterial broths (Escherichia coli, Salmonella).
  • Microbiological analysis and seep filtration were performed to detect bacterial entry.

Main Results:

  • White eggshells exhibited significantly higher porosity with more open pores compared to brown eggshells.
  • SEM analysis revealed pore mouths associated with cuticle disruptions, aiding in pore detection.
  • Bacterial contamination (E. coli, Salmonella) was confirmed in egg contents after incubation in broth.
  • Bacterial entry correlated with the pole of the egg exposed to the broth, with greater contamination at the blunt pole due to higher porosity.
  • Isolated inner shell membranes offered no significant barrier to E. coli penetration.

Conclusions:

  • Eggshell porosity, especially in white eggs, is a critical factor in bacterial penetration and food safety.
  • The blunt pole of the egg presents a greater risk for microbial ingress due to increased porosity.
  • Understanding eggshell microstructure is essential for developing strategies to prevent microbial contamination in eggs.

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