Overview
ISO 7925:1999 is an international standard that specifies the quality and safety requirements for dried oregano (Origanum vulgare L.) in whole or ground leaf form. Developed and published by the International Organization for Standardization (ISO), this standard ensures consistent quality for oregano used in culinary, food processing, and commercial applications worldwide. It excludes Origanum majorana (marjoram) and differentiates genuine oregano from products misleadingly marketed under similar names, such as "Origano, Mexican type" from the Lippia genus.
By establishing clear specifications for odour, flavour, chemical composition, physical characteristics, and permissible levels of extraneous matter, ISO 7925 helps producers, exporters, importers, and regulators maintain high-quality dried oregano standards and safety compliance during storage, packaging, and transportation.
Key Topics
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Product Scope
Applies to both processed and semi-processed dried oregano leaves, whole or ground. The standard excludes Origanum majorana and other non-Origanum species.
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Organoleptic Requirements
Dried oregano must have a characteristic aromatic, pungent, warm, and slightly bitter flavour with no mustiness or foreign odours.
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Purity and Contamination Limits
- Free from living insects, mould growth, and rodent contamination.
- Limits on dead insects and insect fragments visible to naked eye.
- Maximum extraneous matter: 1% by mass for processed, 3% for semi-processed oregano.
- Maximum 3% by mass content of broken stalks and non-leaf parts.
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Chemical Composition Standards
Maintains essential quality indicators such as:
- Maximum moisture content at 12% by mass.
- Total ash content capped at 10-12% (dry basis).
- Acid-insoluble ash limited to 2% (dry basis).
- Minimum volatile oil content of 1.5 to 1.8 ml/100g dry basis, reflecting oregano’s aromatic quality.
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Physical Characteristics
Ground oregano must pass through a 500 μm sieve to ensure consistent particle size and quality.
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Sampling and Testing Guidelines
Samples must be collected and prepared following ISO 948 and ISO 2825 methodologies. Testing procedures for contaminants, ash content, moisture, and volatile oil adhere to specific ISO methods cited in the standard (e.g., ISO 927, ISO 939, ISO 6571).
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Packaging and Labelling
Requirements include the use of clean, dry, and protective containers. Packaging materials must not affect oregano quality or introduce contamination. Labels should detail product type, batch code, net mass, origin, producer information, treatments, and reference to ISO 7925.
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Storage and Transport Recommendations
Oregano should be stored in well-ventilated, dry, and odour-free environments protected from sunlight, moisture, pests, and cross-contamination. Transportation must maintain these conditions to preserve product integrity.
Applications
ISO 7925:1999 serves multiple practical applications across the spice and food industries:
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Quality Assurance for Exporters and Producers
Ensures dried oregano complies with internationally recognized criteria, facilitating market acceptance and reducing trade disputes.
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Regulatory Compliance for Importers and Food Safety Agencies
Provides benchmarks for inspections and certifications, supporting food safety and preventing adulteration.
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Standardized Testing for Laboratories
Offers harmonized testing methods, enabling reproducible results and reliable quality control.
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Packaging and Logistics Optimization
Guides proper packaging materials and transport conditions to maintain oregano quality during distribution.
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Consumer Confidence and Branding
Enhances product credibility through adherence to international standards, benefiting consumer trust and brand reputation.
Related Standards
ISO 7925:1999 is part of a broader framework of ISO standards on spices and condiments, including:
- ISO 927 - Determination of extraneous matter content in spices.
- ISO 928 - Determination of total ash in spices and condiments.
- ISO 930 - Determination of acid-insoluble ash.
- ISO 939 - Determination of moisture content using the entrainment method.
- ISO 948 - Sampling procedures for spices and condiments.
- ISO 1208 - Determination of filth contamination.
- ISO 2825 - Preparation of ground samples for analysis.
- ISO 6571 - Determination of volatile oil content.
Together, these standards provide a comprehensive approach to the quality assurance of dried herbs and spices, ensuring safety, purity, and authenticity.
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