Overview
EN ISO 23275-1:2008 (identical to ISO 23275-1:2006) defines a laboratory method to detect cocoa butter equivalents (CBEs) in cocoa butter and plain chocolate. The procedure uses high-resolution capillary gas-liquid chromatography (HR‑GC) of triacylglycerols followed by regression data evaluation to give a qualitative result: CBEs present / CBEs not present (YES/NO). The method reliably detects 2% CBE in cocoa butter, corresponding to about 0.6% CBE in chocolate (assuming 30% fat).
Key topics and technical requirements
- Analytical principle: Separation of triacylglycerol (TAG) fractions by HR‑GC and linear regression analysis of TAG peaks.
- Detection limit: Applicable for detecting 2% CBE admixture in cocoa butter (~0.6% in standard chocolate).
- Calibration & system suitability: Use of certified reference material IRMM-801 for calibration and checks; CoCal-1 toolbox referenced for validated methods and electronic evaluation.
- Instrumentation:
- Gas chromatograph with cold on‑column injection and flame ionization detector (FID) (alternative injection systems allowed if equivalent results obtained).
- Typical column: 25–30 m, 0.25 mm i.d., fused silica with 50% phenylmethylpolysiloxane, film 0.10–0.15 µm.
- Temperature program example: start 100 °C, ramp 30 °C/min to 340 °C.
- Carrier gas: helium or hydrogen, purity ≥ 99.999%.
- Sample preparation & procedure highlights: Sampling, fat extraction from chocolate, TAG separation by HR‑GC, identification, calculation of response factors and TAG percentages, and decision rule for presence of CBEs.
- Reagents & safety: Use analytical‑grade reagents and non‑chlorinated fat solvents (e.g., diethyl ether, n‑heptane). Follow safety regulations for hazardous materials.
- Precision & validation: Method includes system suitability, repeatability and reproducibility data from interlaboratory tests.
Applications and users
This standard is intended for:
- Food testing laboratories and quality control (QC) units in chocolate and confectionery manufacturers
- Regulatory and enforcement laboratories verifying compliance with labeling and compositional rules
- Researchers and method developers working on fat analysis and authenticity testing
- Certification bodies needing a validated detection method for cocoa butter equivalents
Use cases include routine screening of cocoa butter supplies, auditing plain chocolate for unauthorized vegetable fats, and supporting regulatory compliance (e.g., EU Directive 2000/36/EC).
Related standards
- ISO 23275‑2 - Quantification of cocoa butter equivalents (provides quantification capability, e.g., validated to 5%).
- Reference materials and analytical toolbox: IRMM‑801 and CoCal‑1 for calibration and data evaluation.
Keywords: EN ISO 23275-1:2008, ISO 23275-1:2006, cocoa butter equivalents, CBEs detection, HR‑GC triacylglycerols, IRMM-801, chocolate authenticity.