Overview
SIST ISO 6541:1995 specifies a standardized method for determining the crude fibre content in agricultural food products using the modified Scharrer method. Issued by the Slovenian Institute for Standardization (SIST), this International Standard applies to cereals, cereal products, and similar foodstuffs, including those with less than 1% crude fibre. The method involves a chemical digestion process followed by separation, washing, drying, and incineration to quantify fibre content, providing reliable and comparable results for quality control and product analysis.
Key Topics
- Determination of Crude Fibre Content: Outlines a structured procedure for measuring insoluble and combustible components defined as crude fibre within diverse agricultural food products.
- Modified Scharrer Method: Utilizes a specific reagent blend of acetic acid, nitric acid, and trichloroacetic acid to facilitate effective isolation of crude fibre from food samples.
- Applicability: Suitable for cereals, cereal products, and certain low-fibre food products excluded from general crude fibre determination methods.
- Sample Preparation and Analysis: Includes detailed steps from sample grinding and defatting (when applicable), to separation of insoluble residue using filter crucibles, and precise drying, weighing, and incineration protocols.
- Result Expression and Repeatability: Results are expressed as a percentage relative to the sample as received or to its dry matter content, with guidelines ensuring repeatability and accuracy.
Applications
SIST ISO 6541:1995 offers practical value across the agricultural and food industries:
- Quality Control: Enables food producers to consistently measure and verify crude fibre levels in cereals, grains, flours, and related products to meet regulatory or labeling requirements.
- Product Development: Assists in nutritional assessment and formulation of foods where fibre content influences product claims and consumer information.
- Regulatory Compliance: Supports compliance with national and international food standards that specify maximum or minimum crude fibre content.
- Research and Laboratory Analysis: Provides a validated reference method for laboratories conducting compositional analysis of raw materials and finished food products.
- Export and Import Assessments: Facilitates the harmonization of analytical methods, ensuring reliable comparison of crude fibre data for trade and regulatory acceptance.
Related Standards
For a comprehensive approach to fibre analysis in food products, consider these related international standards:
- ISO 5498: Agricultural food products - Determination of crude fibre content - General method. (Covers broader sample types but excludes those addressed by ISO 6541.)
- ISO 3310-1: Test sieves - Technical requirements and testing - Part 1: Test sieves of metal wire cloth. (Referenced for sample preparation sieve specifications.)
- Relevant ICC Standards: Standards from the International Association for Cereal Science and Technology, especially ICC Standard No. 113, the basis for this Scharrer method.
- ISO/TC 34: Ongoing developments in standards for agricultural food products.
Key terms: crude fibre, agricultural food products, cereals, sample preparation, fibre determination, Scharrer method, food analysis standard, laboratory testing, nutritional analysis, SIST ISO 6541