Overview
EN ISO 8292-2:2010 (equivalent to ISO 8292-2:2008) specifies an indirect pulsed NMR method for determining the solid fat content (SFC) of animal and vegetable fats and oils. Using low‑resolution pulsed nuclear magnetic resonance spectrometry, this standard provides a universal, accurate approach for SFC measurement across a wide variety of fats - including those that exhibit pronounced polymorphism (e.g., cocoa‑butter‑like fats).
Key points:
- Method: Indirect pulsed NMR (compare liquid-phase proton signal to a triolein liquid standard).
- Advantage: More accurate and more universally applicable than the direct method, though it is less easy to perform and has lower reproducibility.
- Includes two thermal pre‑treatments: one for general fats (stabilizing mainly in the β' polymorph) and one for polymorphic, cocoa‑butter‑type fats (stabilizing in the β polymorph). Additional protocols are provided in an informative annex.
Key topics and technical requirements
- Principle: Measure the magnetization decay (liquid proton signal) after a 90° RF pulse and calculate SFC by referencing a 100% liquid standard.
- Triolein standard: Liquid standard must contain ≥99% triolein; peroxide value < 5 (ISO 3960); storage recommendations given.
- NMR spectrometer: Low‑resolution pulsed NMR with a magnet uniform enough that liquid sample magnetization half‑life > 1 000 µs; automatic measurement triggering; adjustable repetition time; preferred 10 mm temperature‑controlled probe at 40 °C.
- Measurement tubes: Glass tubes ~10 mm outer diameter (±0.25 mm), specified wall thickness and length (manufacturer guidance may apply).
- Temperature control: Water baths/temperature blocks required at (0 ± 0.1) °C, (60 ± 0.1) °C and at measurement/tempering temperatures (±0.1 °C). Guidance on blocks vs. water baths and heat transfer considerations is included.
- Measurement temperatures: Standard allows measurements at a range of temperatures (examples include 0 °C, 5 °C, 10 °C, … up to 60 °C).
- Precision: Standard reports results of interlaboratory tests and gives information on repeatability and reproducibility.
Applications and users
EN ISO 8292-2:2010 is intended for:
- Food industry quality control (butter, margarine, confectionery fats, shortenings)
- R&D and formulation labs assessing texture, melting behavior and mouthfeel
- Analytical laboratories performing regulatory or specification testing of fats and oils
- Manufacturers of fats/oils and fat blends who need accurate SFC profiles across temperatures
Benefits for users:
- Accurate, broadly applicable SFC results for diverse fat types
- Standardized procedures for thermal pre‑treatment and measurement that support comparability and product specification
Related standards
- ISO 8292-1 - Direct method for SFC by pulsed NMR
- ISO 661 - Preparation of test sample (fats and oils)
- ISO 3960 - Peroxide value (iodometric) - used for triolein reference checks
Keywords: EN ISO 8292-2:2010, solid fat content, pulsed NMR, indirect method, animal and vegetable fats and oils, triolein standard, thermal pre‑treatment, β' polymorph, β polymorph.
