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Minicolumn detection method applied to almonds: collaborative study.

G I Stanley, V P DiProssimo, A C Koontz

    Journal - Association of Official Analytical Chemists
    |January 1, 1979
    PubMed
    Summary
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    A new minicolumn screening method accurately detects total aflatoxins in almonds. This validated method is now official for identifying aflatoxin levels of 5 ng/g or higher.

    Area of Science:

    • Food Safety
    • Analytical Chemistry
    • Mycotoxin Analysis

    Background:

    • Aflatoxins are toxic compounds produced by molds that contaminate food products.
    • Accurate detection of aflatoxins is crucial for ensuring food safety and preventing health risks.
    • Almonds are susceptible to aflatoxin contamination, necessitating reliable screening methods.

    Purpose of the Study:

    • To collaboratively test and validate a minicolumn screening method for total aflatoxins in naturally contaminated almonds.
    • To establish the reliability and accuracy of the Velasco-type minicolumn for aflatoxin detection.
    • To provide an official method for the routine screening of aflatoxins in almonds.

    Main Methods:

    • Extraction of aflatoxins from naturally contaminated almond samples.

    Related Experiment Videos

  • Cleanup of the almond extract.
  • Application of the extract to a Velasco-type minicolumn for separation.
  • Detection of total aflatoxins (B1, B2, G1, G2) via fluorescence on a Florisil layer.

    • Main Results:

    • The minicolumn method was collaboratively tested by 20 participants.
    • Ninety-six percent of samples with 5-25 ng/g total aflatoxins were correctly identified.
    • Eighty-three percent of negative samples (0 ng/g) were correctly identified.
    • The method demonstrated high accuracy in detecting specified aflatoxin levels.

    Conclusions:

    • The minicolumn screening method is effective for detecting total aflatoxins in almonds.
    • The method has been officially adopted as a first action method for aflatoxin levels >= 5 ng/g.
    • This validated method provides a reliable tool for food safety monitoring of aflatoxins in almonds.