Validation of Modified High-Performance Ion Chromatography Analytical Method for Inositol Phosphates in Soybeans

Area of Science:

• Agricultural Science
• Analytical Chemistry
• Nutritional Science

Background:

• Phytic acid (myo-inositol hexakisphosphate) in soybeans reduces the bioavailability of essential minerals like iron, zinc, and calcium in animals.
• Accurate quantification of inositol phosphates is essential for understanding and improving soybean nutritional quality.

Purpose of the Study:

• To develop and validate a simple, efficient analytical method for measuring specific inositol phosphates in soybeans.
• To provide data on phytic acid content in wild-type and gene-edited soybeans.

Main Methods:

• High-performance ion chromatography was employed to analyze four key inositol phosphates: D-myo-inositol-1,5,6-triphosphate, D-myo-inositol-1,4,5,6-tetraphosphate, D-myo-inositol-1,3,4,5,6-pentaphosphate, and D-myo-inositol-1,2,3,4,5,6-hexakisphosphate.
• Method validation included specificity, linearity (r² ≥ 0.9999), limit of detection, limit of quantification, precision (intra-day: 0.22–2.80%, inter-day: 1.02–8.57%), and accuracy (97.04–99.05% recovery).

Main Results:

• The developed high-performance ion chromatography method demonstrated high linearity and precision for all four analyzed inositol phosphates.
• The method achieved high recovery rates (97.04–99.05%) in soybean samples, confirming its accuracy.
• The validated method provides precise measurements of individual inositol phosphates, enabling accurate assessment of phytic acid levels.

Conclusions:

• A validated, efficient analytical method for quantifying specific inositol phosphates in soybeans has been established.
• This method facilitates the assessment of phytic acid content in different soybean varieties, including gene-edited ones.
• The findings are expected to support breeding programs aimed at developing soybeans with reduced phytic acid content and enhanced mineral bioavailability.