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For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
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Method validation is a crucial process in analytical chemistry designed to confirm that a given method consistently produces reliable and high-quality results. This process is essential when a method is applied to different sample matrices or when procedural modifications are made, ensuring that the results meet acceptable standards across various applications.
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Author Spotlight: Quantification of Aflatoxins and Phytoalexins in Peanut Seeds to Identify Genetic Resistance Against Aspergillus
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[Validation Study on an Improved Quantitative Method for Aflatoxins in Foods].

Masato Yoshimitsu1, Kotaro Uchida1, Masakazu Osakada1

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Shokuhin Eiseigaku Zasshi. Journal of the Food Hygienic Society of Japan
|March 10, 2022
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An improved analytical method for detecting aflatoxins in foods enhances operability and accuracy. This optimized approach reduces preparation time and improves recovery rates for reliable food safety testing.

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LC-MS/MSaflatoxinimmunoaffinity columnvalidation study

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Area of Science:

  • Food Science
  • Analytical Chemistry
  • Toxicology

Background:

  • Established analytical methods for aflatoxins in foods exist, based on Ministry of Health, Labour and Welfare guidelines.
  • Conventional methods require improvements in operability and analytical performance.

Purpose of the Study:

  • To develop an improved analytical method for aflatoxins in foods.
  • Optimization of immunoaffinity column (IAC) selection and purification conditions.
  • To omit the evaporation step after IAC purification to enhance efficiency.

Main Methods:

  • Optimization of immunoaffinity column (IAC) selection and purification parameters.
  • Recovery tests conducted on nine food samples spiked with aflatoxin B1, B2, G1, and G2 standards (2.5 ng/g).
  • Comparison of the improved method's performance against established target values and conventional methods.

Main Results:

  • The improved method achieved high recovery rates (77.0-99.7%) and low coefficients of variation (intra-assay: 1.7-5.6%, inter-assay: 0.9-3.6%).
  • Demonstrated 4.3-10.5% greater recovery compared to the conventional method.
  • Reduced preparation time by 1.5 hours.

Conclusions:

  • The improved method is applicable to nine different food matrices.
  • The optimized method offers enhanced recovery and reduced preparation time, proving effective for aflatoxin analysis in foods.
  • This advancement contributes to more efficient and reliable food safety testing for aflatoxins.