ISO 18054:2004

Overview - ISO 18054:2004 (Irone content in orris oil)

ISO 18054:2004 specifies a laboratory method for the determination of irone content in essential oils of orris rhizome (Iris pallida Lam. or Iris germanica L.) using gas chromatography (GC) on a capillary column. The standard defines the analytical principle (GC with flame ionization detection), the internal standard approach, required reference materials, and the operating conditions needed to obtain reliable, comparable irone measurements in orris oil (commercially known as orris butter).

Key topics and technical requirements

• Analytical principle: Gas chromatography on capillary columns with internal standard quantification (GC-FID).
• Reference materials: Synthetic irones (sum of isomers > 90 %) and internal standards: α-ionone for polar columns or trans‑anethole for apolar columns.
• Dilution and additive: Dichloromethane (≥99 %) as dilution solvent (hazard warning applies) and linalool (≥99 %) as additive in standard mixtures.
• Column types & conditions: Polar (PEG/FFAP) or apolar (methyl silicone) capillary columns, lengths 10–100 m, i.d. 0.2–0.5 mm. Temperature programming examples: polar 100 → 220 °C, apolar 100 → 250 °C at ~2–3 °C/min. Injector/detector temps ~230–260 °C.
• Performance criteria: Column efficiency ≥ 50 000 theoretical plates (measured on linalool peak). Irone isomers must be well separated.
• Identification & quantification: Retention index determination per ISO 7609; response factor calculation using defined standard mixtures; internal standard method for sample determinations.
• Precision: Repeatability limit ~5.13 %; reproducibility limit ~10.16 % (interlaboratory study results; general mean irone ~8.07 %).

Applications - who uses ISO 18054:2004

• Quality control laboratories testing essential oils and orris butter for irone concentration.
• Fragrance and perfumery manufacturers verifying raw material potency and consistency.
• Botanical product manufacturers and suppliers specifying product quality and compliance.
• Analytical service providers and research labs conducting compositional profiling of Iris-derived oils.
• Regulatory bodies and standardization committees assessing test method comparability.

Practical benefits include standardized, reproducible irone measurement for product specification, batch release, supplier qualification, and formulation development.

Related standards

• ISO 7609 - Essential oils: general method for analysis by gas chromatography on capillary columns (referenced for general GC parameters).
• ISO 356 - Essential oils: preparation of test samples (sample handling and preparation).

Keywords: ISO 18054:2004, irone content, orris rhizome, gas chromatography, capillary column, essential oils, internal standard, α-ionone, trans‑anethole, dichloromethane.