Overview
ISO 3217:1974 is an international standard published by the International Organization for Standardization (ISO) that specifies the key characteristics of oil of lemongrass (Cymbopogon citratus). This essential oil, widely used in perfumery, aromatherapy, cosmetics, and pharmaceuticals, requires standardized quality benchmarks to ensure consistency and authenticity across global markets.
The standard focuses on physical and chemical properties defining the quality of lemongrass oil, such as appearance, color, odor, density, refractive index, optical rotation, carbonyl compound content (expressed as citral), and solubility in ethanol. These parameters form a comprehensive specification to facilitate quality control and regulatory compliance.
Key Topics
- Appearance: Oil of lemongrass is characterized by a clear, mobile liquid state, ensuring it is free from cloudiness or particulate matter.
- Color: Ranges from pale yellow to orange-yellow, indicative of proper distillation and freshness.
- Odor: Strong, characteristic scent with a pronounced citral note, the key component responsible for lemongrass's distinctive fragrance.
- Relative Density at 20/20 °C: Must be between 0.872 and 0.897, important for identifying purity and concentration.
- Refractive Index at 20 °C: Values from 1.4830 to 1.4890, used for verifying the product’s identity and detecting adulteration.
- Optical Rotation at 20 °C: Range from -3° to +1°, reflecting the chiral nature of the constituents.
- Carbonyl Compounds Content: A minimum of 75% citral content, a crucial quality marker indicating potent fragrance and therapeutic properties.
- Solubility in Ethanol at 20 °C: Freshly distilled lemongrass oil is soluble in 70% (V/V) ethanol. Solubility may decrease with storage and concentration changes, affecting formulation compatibility.
Applications
ISO 3217:1974 serves as a vital tool for producers, importers, exporters, and quality assurance laboratories involved with lemongrass essential oil. By adhering to this standard, stakeholders can ensure:
- Quality Assurance: Confirm that the oil meets globally recognized criteria for purity and composition.
- Regulatory Compliance: Facilitate international trade by complying with standardized testing and labeling requirements.
- Product Development: Support manufacturers in formulating cosmetics, aromatherapy products, and pharmaceuticals with consistent raw material quality.
- Authentication and Anti-Adulteration: Detect adulterants and ensure the natural origin of lemongrass oil through precise measurement of physical and chemical parameters.
- R&D and Innovation: Provide a clear framework for researchers studying the oil’s properties and potential new uses.
Related Standards
ISO 3217:1974 works in conjunction with several other ISO standards to provide comprehensive guidance on essential oils:
- ISO 212 – Sampling of Essential Oils: Procedures for taking representative samples of oils for laboratory testing.
- ISO/R 210 – Packaging of Essential Oils: Recommendations for suitable packaging ensuring product integrity.
- ISO/R 211 – Labeling and Marking of Containers: Guidelines for clear and accurate labeling of essential oil containers.
- ISO/R 279 – Determination of Density and Relative Density of Essential Oils.
- ISO/R 280 – Determination of Refractive Index of Essential Oils.
- ISO/R 592 – Determination of Optical Rotation.
- ISO 1279 – Determination of Carbonyl Compounds Content by Hydroxylamine Chloride Method.
These related standards support the implementation of ISO 3217 by covering sampling, testing methods, packaging, and labeling, ensuring a comprehensive approach to quality control in the essential oil industry.
Implementing ISO 3217 ensures the consistent production and verification of high-quality oil of lemongrass, benefiting manufacturers, traders, and consumers by fostering trust and facilitating global market access for this valuable natural product.