ISO 1444:1996

Overview

ISO 1444:1996 specifies a standardized laboratory method for determining the free fat content of meat and meat products by solvent extraction. The procedure uses extraction of a dried residue (from the moisture determination in ISO 1442) with n‑hexane or light petroleum and quantifies fat by solvent evaporation, drying and weighing. The standard is intended for routine analytical use and for inter-laboratory comparability of free fat results.

Key topics and technical requirements

• Scope: Method for free fat content expressed as percentage by mass of the test portion; uses extraction of dried material obtained following ISO 1442 (moisture determination).
• Sample & preparation:
  • Laboratory sample mass ≥ 200 g; prepared sample homogenized (mechanical cutter or mincer; plate hole ≤ 4.5 mm).
  • Test portion for drying: 5–8 g, weighed to 0.001 g.
  • Analyze prepared sample as soon as practicable and within 24 h of homogenization.
• Extraction solvent: n‑hexane or light petroleum (40–60 °C distillation range) with bromine value < 1. Residue on complete evaporation ≤ 0.002 g per 100 ml.
• Apparatus: Soxhlet or continuous/semi‑continuous extraction (Soxhlet or automated Soxtec-type systems); extraction thimble (defatted filter paper); boiling chips; drying oven (103 °C ± 2 °C); analytical balance (±0.001 g).
• Procedure highlights:
  • Place dried test portion in extraction thimble, extract with sufficient solvent (1.5–2× extraction tube capacity).
  • Heating for classical Soxhlet: at least 6 h; for Soxtec/automated alternatives: at least 2 h.
  • Verify completeness with a further 1 h extraction - increase must not exceed 0.1% of the test portion.
  • Evaporate solvent, dry extract at 103 °C, cool in desiccator and weigh.
• Performance & reporting:
  • Lowest reliable fat in test portion: 0.05 g.
  • Precision established by interlaboratory study; repeatability and reproducibility limits are provided in the standard (95% probability level).
  • Results reported rounded to one decimal place; test report must include method details, sample identification and any deviations.

Applications and users

• Food testing laboratories performing compositional analysis of raw meat, processed meat, sausages and meat-based products.
• Quality control teams in meat processing and food manufacturing for labeling, formulation control and compliance.
• Regulatory and inspection bodies verifying fat content claims and safety/quality standards.
• Research labs studying fat distribution, product reformulation or comparative method validation (Soxhlet vs automated extraction).

Related standards

• ISO 1442:1996 - Meat and meat products - Determination of moisture content (reference method used to prepare the dried residue).
• ISO 3100-1 - Sampling guidance for meat products.
• ISO 5725 / ISO 5725-1 - Precision of measurement methods (interlaboratory repeatability/reproducibility principles).

Keywords: ISO 1444:1996, free fat content, meat and meat products, extraction, n‑hexane, Soxhlet, Soxtec, ISO 1442, repeatability, reproducibility.