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Related Experiment Videos

Reaction between albumen and 3,3',5,5'-tetramethylbenzidine as a method to evaluate egg freshness.

M Rossi1, A Hidalgo, C Pompei

  • 1Dipartimento di Scienze e Tecnologie Alimentari e Microbiologiche, Sez. Tecnologie Alimentari, Università degli Studi di Milano, via Celoria 2, 20133 Milano, Italy. margherita.rossi@unimi.it

Journal of Agricultural and Food Chemistry
|August 22, 2001
PubMed
Summary

The 3,3

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Area of Science:

  • Food Science
  • Analytical Chemistry
  • Biochemistry

Background:

  • Assessing shell egg freshness is crucial for food quality and safety.
  • Traditional methods like Haugh Unit and air-cell height have limitations.
  • The 3,3',5,5'-tetramethylbenzidine (TMB) colorimetric test offers a potential alternative.

Purpose of the Study:

  • To evaluate the 3,3',5,5'-tetramethylbenzidine colorimetric test for shell egg freshness.
  • To simplify and optimize the TMB method for albumen analysis.
  • To investigate the TMB reaction kinetics and influencing factors.

Main Methods:

  • A simplified 3,3',5,5'-tetramethylbenzidine colorimetric test was applied to egg albumen.
  • The TMB reaction development was studied in eggs stored at various temperatures and times.

Related Experiment Videos

  • Reagent stability and analytical method repeatability were assessed.
  • The role of iron and copper ions in the colorimetric response was investigated.

    • Main Results:

    • The modified TMB method demonstrated a coefficient of variation of 10.3% due to natural egg variability.
    • This variability is comparable to furosine but lower than Haugh Unit or air-cell height.
    • Iron ions play a predominant role in the colorimetric response, with copper ions enhancing it.
    • The TMB reagent solution showed adequate stability.

    Conclusions:

    • The simplified 3,3',5,5'-tetramethylbenzidine colorimetric test is a viable method for assessing shell egg freshness.
    • The TMB test offers comparable or better precision than existing egg freshness indices.
    • Understanding the reaction mechanism, particularly the role of metal ions, aids in method optimization.