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Related Experiment Videos

Interaction between sample preparation techniques and colorimetric reagents in nitrite analysis in meat

J B Fox, T E Zell, A E Wasserman

    Journal - Association of Official Analytical Chemists
    |November 1, 1981
    PubMed
    Summary

    Ascorbate and chloride concentrations, sample preparation, and Griess reagents affect nitrite measurement in food. Ascorbate interferes with nitrite determination, but methods like AOAC and mercuric chloride can eliminate this interference.

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    Area of Science:

    • Food chemistry
    • Analytical chemistry
    • Biochemistry

    Background:

    • Accurate nitrite quantification is crucial in food analysis, particularly in meat products.
    • Nitrite determination often employs colorimetric methods like the Griess reaction.
    • Factors such as sample matrix and reagent interactions can influence analytical results.

    Purpose of the Study:

    • To investigate the impact of chloride and ascorbate concentrations on nitrite measurement in model and meat systems.
    • To evaluate the influence of sample preparation methods and Griess reagent combinations on colorimetric nitrite determination.
    • To identify strategies for mitigating interferences in nitrite analysis.

    Main Methods:

    • Utilized model systems and meat samples for nitrite analysis.

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  • Employed various Griess reagent combinations (sulfanilic acid/N-(1-naphthyl)-ethylenediamine and sulfanilamide/1-naphthylamine).
  • Assessed the effects of different sample preparation techniques and chloride/ascorbate concentrations.

    • Main Results:

    • Nitrite measurement was significantly influenced by the interplay of chloride and ascorbate levels, sample preparation, and Griess reagent choice.
    • Ascorbate led to nitrite loss upon heating and caused variable interference in the Griess reaction, dependent on the specific reagents used.
    • The AOAC procedure and mercuric chloride addition effectively eliminated ascorbate interference, with AOAC being less effective at high ascorbate concentrations.
    • Chloride enhanced color development with sulfanilic acid-based Griess reagents but did not affect sulfanilamide-based reagents.

    Conclusions:

    • The accuracy of nitrite quantification in food systems is highly dependent on controlling analytical conditions.
    • Ascorbate interference in Griess reactions necessitates specific sample preparation or reagent choices for reliable results.
    • Understanding these interactions is vital for optimizing nitrite measurement protocols in food science and safety.