Overview
ISO 663:2017, titled "Animal and vegetable fats and oils - Determination of insoluble impurities content," is an international standard developed by ISO Technical Committee ISO/TC 34, Subcommittee SC 11. This fifth edition specifies a reliable method to determine the content of insoluble impurities present in animal and vegetable fats and oils. The impurities measured typically include dirt, foreign matter, soaps (especially calcium soaps), oxidized fatty acids, and other substances insoluble in solvents like n-hexane or light petroleum.
This standard excludes milk and milk-derived fats and oils from its scope to maintain specificity. The methodology ensures consistency and comparability in analysis, crucial for quality control and regulatory compliance across the fats and oils industry.
Key Topics
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Scope and Applicability
ISO 663:2017 applies to the determination of insoluble impurities in animal and vegetable fats and oils but excludes milk and milk product fats. It is designed for fats and oils in various physical states, focusing on impurities insoluble in specific solvents.
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Test Principle
The procedure involves dissolving a test portion of the fat or oil in an excess of n-hexane or light petroleum, filtering, washing, drying, and weighing the insoluble residue. This quantifies the percentage of insoluble impurities by mass.
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Reagents and Equipment
The standard requires high-purity analytical reagents, such as n-hexane or light petroleum meeting specified distillation and purity criteria, and equipment including analytical balances, drying ovens, filtration apparatus, and desiccators.
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Sampling and Preparation
Though sampling is outside the method’s scope, it recommends referring to ISO 5555 for sampling fats and oils. Test samples should be prepared per ISO 661 to ensure repeatable, representative analysis.
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Analytical Procedure
Key steps include weighing the test sample accurately, solvent extraction, filtration using ashless filter paper or glass filter crucibles, washing, and drying the residues at 103 °C. The procedure accommodates special handling for acid oils by coating filter crucibles with kieselgur.
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Result Calculation and Reporting
Results are expressed as the percentage by mass of insoluble impurities relative to the test portion. The standard prescribes precision criteria for repeatability and reproducibility and details the essential information to include in test reports.
Applications
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Quality Control in Edible Oils and Fats
Ensuring fats and oils meet purity standards is vital for food safety and product quality. ISO 663:2017 facilitates the assessment of insoluble contaminants that can affect oil refinement, processing, and end-use suitability.
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Feedstock and Industrial Fats Monitoring
Manufacturers and processors of animal and vegetable fat derivatives use this method to monitor raw materials and intermediates for impurities that could impair performance or processing.
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Regulatory Compliance and Standards Enforcement
Regulatory agencies and certification bodies adopt the ISO 663:2017 method to verify product conformity with safety and quality regulations, enhancing consumer protection.
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Research and Development
Laboratories and researchers utilize this standard for methodical assessment of fat and oil samples during product development or comparative studies.
Related Standards
ISO 663:2017 should be used in conjunction with several related ISO standards to ensure comprehensive quality and reliability in fats and oils testing:
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ISO 5555 - Animal and vegetable fats and oils - Sampling
Provides guidelines on proper sampling methods to obtain representative test samples.
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ISO 661 - Animal and vegetable fats and oils - Preparation of test sample
Describes the preparation of samples prior to analysis in accordance with ISO 663.
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ISO 5725-1 and ISO 5725-2 - Accuracy (trueness and precision) of measurement methods and results
Define principles for determining precision, repeatability, and reproducibility of analytical methods like ISO 663.
By adhering to ISO 663:2017 and related standards, professionals in the fats and oils industry ensure consistent, accurate assessment of insoluble impurities, enhancing the safety, quality, and performance of their products.
Keywords: ISO 663:2017, insoluble impurities, animal fats, vegetable oils, fats and oils analysis, n-hexane extraction, quality control, edible oils testing, fats and oils standard, impurity determination, solvent filtration method, analytical procedure fats oils.
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