ISO 21415-2:2026

Overview

ISO 21415-2:2026 specifies standardized methods for the determination of wet gluten content and the gluten index in wheat and wheat flour using mechanical means. Developed by the International Organization for Standardization, this standard targets a core aspect of wheat and flour quality measurement, covering both Triticum aestivum L. (common wheat) and Triticum durum Desf. (durum wheat). The document ensures uniformity and repeatability in measuring gluten characteristics, which are essential parameters for quality control in milling, baking, and food production industries.

Key Topics

• Wet Gluten Content Determination
  The standard outlines the process for extracting and quantifying wet gluten from flour or ground wheat, crucial for understanding dough properties and end-product performance.

• Gluten Index Measurement
  ISO 21415-2:2026 describes the mechanical procedure for determining the gluten index, a widely accepted indicator of gluten strength and wheat quality.

• Applicability
  Procedures are directly intended for wheat flour but are also applicable to common and durum wheat when ground to specified particle sizes.

• Mechanical Extraction
  Emphasizes the use of automated systems and prescribed apparatus, such as mixing/washing chambers and centrifuge units, to standardize results between laboratories.

• Test Procedures & Reporting
  Includes detailed steps for sample preparation, dough washing, centrifuging, and guidance on how to document results, including specifying equipment, parameters, and any deviations.

• Performance and Precision
  Contains precision data supported by interlaboratory test results, ensuring users can interpret repeatability and reproducibility metrics for quality assurance.

Applications

Implementing ISO 21415-2:2026 offers practical advantages in various industries:

• Flour Milling: Standardized gluten measurement enables millers to monitor and optimize flour characteristics for different applications.
• Baking and Pasta Production: Accurate gluten quantification supports formulation adjustments for bread, pasta, and related food products, impacting texture, volume, and cooking performance.
• Quality Assurance and Lab Testing: Laboratories use this method to provide reliable, comparable data for producers, buyers, and regulators globally.
• Product Development: Manufacturers seeking consistency in processed foods benefit from standardized gluten measurements to assure functionality and customer satisfaction.
• Trade and Regulatory Compliance: Ensures alignment with international references for product specification and export documentation.

Related Standards

ISO 21415-2:2026 is closely aligned with other internationally recognized methods for assessing gluten content in cereals and cereal products, including:

• ISO 21415-1 – Wheat and wheat flour - Gluten content - Part 1: Determination of wet gluten by manual extraction
  (Focuses on manual instead of mechanical procedures)
• ICC 137/1, ICC 155 – Methods developed by the International Association for Cereal Science and Technology
• AACC Method 38-12.02 – Approved method from the American Association of Cereal Chemists International for gluten index

By adhering to ISO 21415-2:2026, organizations benefit from global harmonization of analytical practices, enhancing the trustworthiness of gluten content and gluten index data across laboratory environments and markets.

Conclusion

The adoption of ISO 21415-2:2026 standardizes the determination of wet gluten and gluten index in wheat flours-key factors in wheat and flour quality. This improves product quality, supports innovation, and facilitates trade within the agri-food sector. Regular use of this method ensures consistent, reproducible results, strengthening quality control and product development processes in the grain and food industries.