Overview
ISO/TS 21296:2026 - Oilseeds - Determination of oil content by the Randall extraction method is an internationally recognized technical specification developed by ISO. This document specifies a rapid and automated laboratory method for determining oil content in oilseeds by using the Randall extraction technique. The standard is designed for oilseeds intended as industrial raw materials and defines the hexane (or light petroleum) extract as the “oil content”.
The Randall extraction method offers a consistent, efficient, and reproducible approach compared to traditional extraction techniques and supports accurate quality control for oilseed processors and laboratories.
Key Topics
- Scope and Applicability: The standard covers all major industrial oilseeds, including specific procedures for sunflower seeds (with additional moisture content determination) and allows the separate analysis of pure seeds and impurities if required.
- Randall Extraction Principle: Oil is rapidly extracted from ground oilseeds using hexane or light petroleum in an automated system, reducing extraction times and increasing laboratory throughput.
- Sample Preparation: Clear steps for properly grinding different seed types (e.g., sunflower, groundnut, palm kernel) to prevent moisture loss and compositional changes.
- Moisture Correction: Incorporates precise moisture determination, especially for sunflower and highly oily seeds, to ensure result accuracy.
- Special Cases: Provides procedures for analyzing and calculating oil content where impurities or non-oleaginous materials have been separated beforehand.
- Calculation and Reporting: Outlines required formulas for expressing results as a percentage of mass either as received or on a dry matter basis.
- Quality and Performance: Emphasizes required accuracy, repeatability, and reproducibility in line with ISO 659.
Applications
The ISO/TS 21296:2026 standard is highly applicable in:
- Oilseed Processing Plants: For routine determination of oil content in incoming seeds, ensuring quality control for production and trade.
- Analytical Laboratories: Supporting rapid and reproducible testing for research, product development, and regulatory compliance.
- Commodity Trading: Providing standardized measurements for oil content that aid in pricing and contractual agreements.
- Seed Breeding and Agriculture: Facilitates selection of high-yield oilseed varieties by offering precise, comparable oil content data.
- Quality Assurance: Enables the separation and analysis of impurities versus pure seed fractions for more detailed assessments.
The methodology supports informed decision-making by providing a reliable measure of oil yield, maximizing extraction efficiency, and detecting variations in seed batches. Its capability to analyze oils on specific moisture content or basis adds operational flexibility for a range of user requirements.
Related Standards
ISO/TS 21296:2026 integrates seamlessly with several other key international standards for oilseed analysis:
- ISO 659: Oilseeds - Determination of oil content (Reference method), the definitive method in case of disputes.
- ISO 658: Oilseeds - Determination of content of impurities, a reference for sample purity analysis.
- ISO 664: Oilseeds - Reduction of laboratory sample to test sample, foundational for sample preparation protocols.
- ISO 665: Oilseeds - Determination of moisture and volatile matter content, essential for accurate calculation and result expression.
- ISO 21294: Oilseeds - Manual or automatic discontinuous sampling, recommended for representative sampling approaches.
Adopting ISO/TS 21296:2026 ensures alignment with best practices in oilseed analysis, supporting global trade, regulatory compliance, and industrial quality assurance in the oilseed sector.
Keywords: oilseed analysis, Randall extraction, oil content determination, hexane extraction, oilseeds ISO standard, moisture correction, oilseed sample preparation, laboratory oilseed testing, quality control, analytical method.
