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Defatting technique for two ground spices using simple reflux apparatus: collaborative study

R G Dent

    Journal - Association of Official Analytical Chemists
    |September 1, 1982
    PubMed
    Summary
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    Solvent defatting is effective for turmeric analysis using isopropanol, offering an alternative to AOAC method 44.122(a). However, the reflux method with chloroform for oregano (AOAC 44.122(b)) significantly reduced insect fragment recovery, making it unsuitable.

    Area of Science:

    • Food science
    • Analytical chemistry
    • Microscopy

    Background:

    • Microanalytical methods are crucial for detecting foreign matter in food products.
    • Solvent defatting is a common pretreatment step in spice analysis.
    • Existing methods may have limitations in efficiency and recovery rates.

    Purpose of the Study:

    • To evaluate a solvent defatting technique using different agents for turmeric and oregano.
    • To compare the recovery rates of rodent hair and insect fragments with existing AOAC methods.
    • To determine the suitability of the technique as an alternative for specific spice analyses.

    Main Methods:

    • A solvent defatting technique was applied to turmeric using isopropanol and oregano using chloroform.
    • Recovery rates of rodent hair and insect fragments were quantified.

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  • Results were compared to those from a previous collaborative study and AOAC methods 44.122(a) and 44.122(b).

    • Main Results:

    • For turmeric, isopropanol defatting showed no significant difference in recovery rates compared to the original study.
    • For oregano, chloroform defatting via reflux resulted in significantly lower recovery of insect fragments.
    • The technique was recommended as an alternative for turmeric analysis (AOAC 44.122(a)).

    Conclusions:

    • The solvent defatting technique with isopropanol is a viable alternative for turmeric analysis.
    • The reflux defatting technique with chloroform is not recommended for oregano analysis (AOAC 44.122(b)) due to reduced insect fragment recovery.
    • Reflux action defatting techniques should be considered during new method development.