Overview
ISO 1026:1982 provides standardized methods for determining the dry matter content and water content in fruit and vegetable products. The standard is published by the International Organization for Standardization (ISO) and specifies two valuable laboratory techniques: drying under reduced pressure for dry matter measurement, and azeotropic distillation for water content determination. This standard is essential for ensuring consistency and reliability in analytical results across the agricultural and food industries.
Key Topics
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Dry Matter Content Determination
- Utilizes drying under reduced pressure at 70°C.
- Suitable for liquid, semi-liquid, and pasty fruit and vegetable products.
- Not recommended for products that undergo significant changes during drying or those with low water content (below 10%).
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Water Content Determination
- Employs azeotropic distillation using a volatile solvent immiscible with water (e.g., toluene or benzene).
- The method recovers water by vaporization, condensation, and measurement in a graduated tube.
- Restrictions apply for products that are water- or solvent-soluble, or contain high levels of volatile or fermentative components.
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Laboratory Equipment & Reagents
- Describes oven specifications for reduced pressure drying, analytical balances, absorbent paper/sand preparation, and distillation apparatus setup.
- Requires use of standardized reagents and careful sample mixing.
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Reporting and Precision
- Details calculation methods for expressing results as percentage by mass or per 100 ml for liquids.
- Specifies repeatability criteria for analytical consistency.
- Outlines the necessary information to be included in laboratory test reports.
Applications
The procedures in ISO 1026:1982 are widely applied in:
- Quality control of fruit and vegetable products: Accurate determination of dry matter and water content is fundamental for product classification, processing decisions, and labeling.
- Research and product development: Reliable, repeatable data support the development of new products and improvement of existing formulations in the agri-food and food technology sectors.
- Industry compliance and trade: Standardized test methods ensure consistency and comparability across international markets, aiding conformity with regulatory requirements and contract specifications.
These methods are crucial for manufacturers, laboratories, and regulatory agencies involved in the production, export, and inspection of fruit and vegetable commodities.
Related Standards
Professionals using ISO 1026:1982 may also reference the following standards:
- ISO 5529 - Cereal and cereal products - Determination of water content
- ISO 712 - Cereals and cereal products - Determination of moisture content - Reference method
- ISO 751 - Fruit and vegetable products - Determination of water-insoluble solids
- ISO 2173 - Fruit and vegetable products - Determination of soluble solids
These related standards provide complementary methods and procedures for analyzing different aspects of food and agricultural products.
Practical Value
Adoption of ISO 1026:1982 ensures laboratories and producers achieve:
- Consistent test results across batches and facilities
- Reliable data for product labeling and regulatory compliance
- Improved product quality through precise control of moisture and dry matter content
- Facilitated international trade by harmonizing test methods globally
This standard is a key reference document for quality assurance in the fruit and vegetable product industries.