ISO 3947:1977

Overview

ISO 3947:1977 is an international standard established by the International Organization for Standardization (ISO) for the determination of total fat content in starches, whether native or modified. This methodology is specifically designed for starch products with a total fat content of less than 1.5% by mass (m/m). The process involves hydrolysis with boiling hydrochloric acid, followed by coagulation, filtration, drying, and extraction of fat using a suitable solvent.

Determining fat content is essential in the starch industry for quality control, product labeling, and compliance with food regulations. This standard ensures consistency and reliability in analytical results across laboratories worldwide.

Key Topics

• Scope: Applies to both native and modified starches with low total fat content (<1.5% m/m).
• Analytical Principle:
  • Hydrolysis of starch using boiling hydrochloric acid
  • Coagulation of insoluble products by cooling
  • Filtration and drying of the precipitate
  • Extraction of total fat using solvents such as n-hexane, light petroleum, or carbon tetrachloride
• Required Apparatus:
  • Efficient extractor (e.g., Soxhlet or Twisselmann)
  • Filter paper and extraction thimbles
  • Water baths, vacuum/standard ovens, and analytical balance
• Test Precision: Reproducibility is ensured by performing duplicate determinations under defined repeatability conditions.
• Reporting: Test results must specify the method, solvent used, and any incidental observations.

Applications

ISO 3947:1977 is widely applicable in sectors where precise quantification of fat content in starch products is critical:

• Food Industry: Ensures compliance with nutritional labeling and regulatory standards for starch-based ingredients, additives, and processed foods.
• Quality Assurance: Enables consistent quality control in the production and modification of starch derivatives by monitoring residual fat content.
• Research and Development: Supports the development of new starch formulations and modified starches with tailored physical and nutritional properties.
• Trade and Compliance: Facilitates international trade and verification by providing a harmonized methodology for total fat determination, reducing disputes caused by inconsistent analytical practices.

This standard is crucial for producers, analytical laboratories, food inspectors, and anyone involved in the manufacture or assessment of starch products.

Related Standards

For comprehensive starch analysis and quality control, ISO 3947:1977 is used alongside other key ISO standards, such as:

• ISO 5808: Starch derivatives and by-products - Determination of "extractable" fat content
• ISO/TC 93: Standards for starch, derivatives, and by-products

Consulting related standards supports holistic testing and reliable product characterization across the starch industry.

Adhering to ISO 3947:1977 ensures precise, repeatable, and internationally recognized results for total fat content analysis in native and modified starches, supporting compliance, safety, and industry best practices.