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Precalibration evaluation procedures for mid-infrared milk analyzers.

J M Lynch1, D M Barbano, M Schweisthal

  • 1Department of Food Science, Cornell University, Ithaca, NY 14853, USA. jl72@cornell.edu

Journal of Dairy Science
|June 15, 2006
PubMed
Summary

USDA Federal Milk Market Administrators (FMMA) developed precalibration procedures for mid-infrared (MIR) milk analyzers. These procedures ensure instrument accuracy for milk composition analysis, crucial for payment and herd improvement programs.

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Area of Science:

  • Agricultural Science
  • Analytical Chemistry
  • Instrumentation

Background:

  • Mid-infrared (MIR) analyzers are vital for rapid, cost-effective milk composition analysis (fat, protein, lactose).
  • These instruments are secondary testing devices requiring calibration against chemical reference methods.
  • Precalibration ensures MIR analyzers are in optimal working order before calibration.

Purpose of the Study:

  • To detail the precalibration procedures developed by the USDA Federal Milk Market Administrators (FMMA).
  • To evaluate the effectiveness of these procedures for mid-infrared (MIR) milk analyzers.
  • To assess the impact of precalibration on instrument stability and accuracy.

Main Methods:

  • Evaluation of flow system integrity, homogenization efficiency, and water/milk repeatability.

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  • Assessment of zero shift, linearity, primary slope, and purging efficiency.
  • Establishment and analysis of intercorrection factors for filter-based and Fourier transform infrared instruments.

    • Main Results:

    • Precalibration procedures were applied longitudinally across diverse MIR instrument models.
    • All instruments met precalibration criteria, demonstrating consistent performance over time.
    • Intercorrection factors were stable within instruments and similar across those using comparable wavelengths, but significantly influenced by reference wavelength selection.

    Conclusions:

    • The FMMA precalibration procedures are effective in ensuring the reliability of MIR milk analyzers.
    • Consistent application of these procedures maintains instrument accuracy for milk payment and herd improvement.
    • Reference wavelength selection is a critical factor influencing intercorrection factors in MIR analysis.