ISO 22630:2015

Overview

ISO 22630:2015 - "Oilseed meals - Determination of oil content - Rapid extraction method" specifies a laboratory procedure for rapid assessment of residual oil in oilseed meals, pellets and expeller cakes. The method is intended to evaluate the efficiency of de‑oiling processes by comparing oil content of the original oilseed with the residual oil in the corresponding meal product. It applies to meals produced by mechanical expelling or solvent extraction, but is not intended for disputed legal/contractual cases (ISO 734 applies there).

Key topics and technical requirements

• Principle: Wet grinding of a test portion in a micro‑ball mill with solvent followed by continuous solvent extraction, solvent distillation and gravimetric determination of the oil residue.
• Sample size & preparation: Typical test portion is 5 g of a well‑mixed test sample; sample preparation follows ISO 5502.
• Solvents: Use technical hexane, n‑hexane or light petroleum ether meeting the standard’s distillation and residue limits; recovered solvent must not be reused.
• Apparatus: Mechanical microgrinder (micro‑ball mill), extraction thimble, continuous extraction apparatus (100–200 ml flask with condenser), and a drying oven maintained at 103 °C ± 2 °C.
• Procedure highlights:
  • Wet grind sample with ~20 ml solvent (specified grinding/shaking times).
  • Transfer to extraction thimble, rinse (total solvent ≈70 ml), cover with cotton wool, and extract for 1 hour from boiling while maintaining a minimum reflux rate.
  • Evaporate solvent, dry extract 1.5 h at 103 °C, reweigh; report oil content as a percentage mass fraction (results to one decimal place).
• Precision: For oil contents in the 0–5% range, typical repeatability (r) ≈ 0.3% and reproducibility (R) ≈ 0.8%. Annex A summarizes interlaboratory precision for rapeseed, soy and sunflower meals.

Practical applications

• Routine quality control in vegetable oil and oilseed processing facilities to monitor de‑oiling performance.
• Incoming/outgoing product testing for oilseed meal and animal feed manufacturers.
• Process optimization and troubleshooting for expeller and solvent extraction lines.
• Research and development labs comparing residual oil across different processing conditions.

Who should use this standard

• Analytical laboratories performing oil content tests
• Oilseed processors and refinery QC teams
• Feed producers and grain/meal traders
• Regulatory and inspection bodies needing a rapid, standardized extraction method

Related standards

• ISO 734 - for disputed or contractual cases
• ISO 771 - determination of moisture and volatile matter (used for dry‑matter calculations)
• ISO 5502 / ISO 5500 - sample preparation and recommended sampling
• ISO 5725 - methods for evaluating precision (interlaboratory statistics)

Keywords: ISO 22630:2015, oilseed meals, oil content determination, rapid extraction method, de‑oiling efficiency, expeller cakes, solvent extraction, technical hexane, micro‑ball mill.