ISO 3972:2011, "Sensory analysis - Methodology - Method of investigating sensitivity of taste", defines objective test methods to familiarize and evaluate assessors’ taste sensitivity. It provides standardized procedures for taste identification (basic tastes + metallic sensation), threshold-type tests (recognition, difference, satiation), and preliminary categorization or monitoring of sensory panel members. The standard is used in sensory analysis, taste testing, and panel training for food and beverage evaluation.
Key topics and technical requirements
- Reference substances and concentrations: Specifies food‑grade reference materials for tastes (citric acid, caffeine, sodium chloride, sucrose, monosodium glutamate, iron(II) sulfate) and stock/dilution preparation tables for reproducible gustatory stimuli.
- Water quality: Requires neutral, tasteless, odourless water; demineralized water is recommended for metallic sensation to avoid oxidation and for sensitive measurements.
- Apparatus and reagents: Uses calibrated one‑mark volumetric flasks, burettes or pipettes, and presentation vessels (about 50 ml). Safety and food‑grade compliance are emphasized.
- Test environment: Tests must be run in rooms conforming to ISO 8589 with conditions and procedures following ISO 6658 (temperature, timing, rinsing, sample order).
- Test procedures:
- Identification of tastes using prepared mixtures (specified dilutions) presented in randomized coded samples.
- Familiarization with threshold tests using series of increasing dilutions (D1–D8), randomized replicates to avoid deduction, and notation system (0, ?, ×, ××, …).
- Data recording and interpretation: Individual answer forms or computerized capture; sensitivity expressed as the concentration at which a correct perception is finally recorded. Results are analyzed per assessor for panel selection or monitoring.
- Safety note: Users must follow normal laboratory safety and national regulations for reagent use and food‑grade materials.
Applications and users
ISO 3972 is valuable for:
- Sensory scientists and panel trainers performing taste sensitivity training and assessment.
- Food and beverage R&D and quality assurance teams selecting or monitoring sensory panelists.
- Contract sensory testing laboratories standardizing assessor screening and periodic monitoring.
- Academic researchers studying gustatory thresholds and taste perception.
Benefits include standardized taste recognition training, consistent assessor categorization, and improved reliability of sensory panel data.
Related standards
- ISO 5492 - Sensory analysis vocabulary
- ISO 6658 - Sensory analysis methodology guidance
- ISO 8586 - Selection, training and monitoring of assessors
- ISO 8589 - Test room design for sensory analysis
Keywords: ISO 3972, sensory analysis, taste sensitivity, gustatory threshold, taste recognition, sensory panels, taste testing, ISO standard.