Overview
ISO 5497:1982 is an international standard developed by the International Organization for Standardization (ISO) that provides methodological guidelines for the preparation of samples in sensory analysis when direct sensory evaluation is not feasible. This standard is particularly relevant for food products with intense flavors or highly concentrated forms, such as spices, condiments, extracts, and syrups.
The standard addresses challenges that arise from sensory testing of samples that are too potent, viscous, or otherwise unsuitable for direct analysis. It outlines practical strategies to prepare these samples in a way that allows accurate evaluation of their organoleptic properties-taste, aroma, texture-ensuring meaningful sensory analysis results.
Key Topics
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Scope and Application
ISO 5497 focuses on samples of intensely flavored or very concentrated food products that require preparation before sensory assessment due to factors like flavor intensity or physical properties (e.g., high viscosity or powderiness).
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Principle of Sample Preparation
The core principle is the preparation of a test sample enabling direct sensory assessment of its organoleptic qualities. Two main methods are proposed:
- Mixing the sample with a chemically defined neutral substance (e.g., water, lactose, dextrose) to dilute or disperse the sample without altering the sensory attribute being measured.
- Incorporating the sample into a neutral food medium (e.g., milk, oil, rice, bread) to evaluate its effect in the intended food matrix.
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Preparation Guidelines
The standard emphasizes consistency in:
- The sample-to-medium ratio across all tests within a series.
- The temperature of the preparation and subsequent sensory analysis to maintain uniform assessment conditions.
- Avoiding dilutions or additions that cause antagonistic or synergistic flavor interactions that could distort results.
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Auxiliary Substances for Mouth Cleansing
Effective palate cleansing substances recommended include:
- Still, tasteless water
- Unsalted crackers or biscuits
- Cooked rice
- Fresh white bread (preferably unsalted)
These help prevent flavor carryover and ensure accurate successive evaluations.
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Assessment Considerations
Assessors must wait to clear any persistent aftertaste before continuing with further sensory tests by rinsing the mouth with an appropriate auxiliary substance.
Applications
ISO 5497 is valuable in multiple practical contexts within food sensory analysis, including:
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Quality Control
Facilitating reliable sensory assessment of concentrated flavor ingredients such as spice extracts, syrups, or seasoning blends.
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Product Development
Assisting in flavor profiling and formulation adjustments where direct tasting of concentrated samples is impractical or unsafe.
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Research and Sensory Studies
Enhancing sensory analysis methods for research involving herbal extracts, medicinal foods, and products with unusual physical forms.
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Sensory Panel Training
Providing standardized techniques to prepare test samples, enabling consistent panelist evaluation and reproducible data.
Related Standards
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ISO 5492: Sensory Analysis - Vocabulary
Provides standardized terminology crucial for clear communication in sensory testing procedures.
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ISO 6658: Sensory Analysis - Methodology - General Guidance
Offers overarching guidance on sensory evaluation methods, complementing the sample preparation focus of ISO 5497.
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ISO 6564: Sensory Analysis - Methodology - Methods for Establishing the Flavour Profile
Relevant for detailed flavor profiling following the preparatory steps outlined in ISO 5497.
By adhering to ISO 5497:1982, sensory analysts ensure that samples unsuitable for direct tasting-due to high intensity or concentration-are prepared systematically to provide valid and consistent sensory data. This standard supports accurate organoleptic evaluation of complex products while maintaining analytical integrity and repeatability.