Anion-exchange method for determination of phytate in foods: collaborative study

Area of Science:

• Food Chemistry
• Analytical Chemistry
• Nutritional Science

Background:

• Phytate is a key organic compound in plant-based foods.
• Accurate phytate quantification is crucial for nutritional assessments.
• Existing methods require refinement for broader application.

Purpose of the Study:

• To validate a modified anion-exchange method for phytate determination.
• To assess the method's accuracy and reproducibility across diverse food matrices.
• To establish a standardized analytical approach for phytate analysis.

Main Methods:

• A modified anion-exchange chromatography technique was employed.
• Seven diverse food samples were analyzed in triplicate by multiple collaborators.
• Blind duplicate samples were used to ensure unbiased evaluation.

Main Results:

• Phytate concentrations varied significantly across samples, ranging from 2.38 to 46.70 mg/g.
• Repeatability relative standard deviations (RSD) were between 2.5% and 10.1%.
• Reproducibility RSDs ranged from 4.5% to 11.0%, indicating good method consistency.

Conclusions:

• The modified anion-exchange method provides reliable phytate quantification.
• The method demonstrated acceptable precision for repeatability and reproducibility.
• The analytical method has been officially adopted for first action use.