Overview
CEN ISO/TR 29263:2021 - Cereals and cereal products - Sampling studies (ISO/TR 29263:2021) - is a CEN-endorsed ISO technical report that documents three empirical sampling studies (United Kingdom, France, Germany) aimed at defining a harmonized grain sampling protocol for official controls. The report compiles methods, results and conclusions on sampling cereals in different handling conditions and was used as evidence in drafting ISO 24333. It addresses sampling variability, sample preparation (comminution/homogenization) and uncertainty related to contaminant testing such as mycotoxins (e.g., deoxynivalenol - DON, ochratoxin A - OTA).
Key topics and technical focus
- Sampling protocols and study design
- Field studies of sampling in lorries, silos and flowing grain conditions.
- Comparison of manual, automatic and alternative sampling methods.
- Contaminant distribution and representativeness
- Investigations into spatial distribution of mycotoxin-contaminated kernels within loads.
- Assessment of how loading methods and grain flow affect sample representativity.
- Sample preparation and comminution
- Processes for producing homogeneous laboratory test samples from incremental samples.
- Evaluation of comminution methods for reliable analytical results.
- Uncertainty and statistical analysis
- Comparison of uncertainty as a function of number and location of incremental samples.
- Data-driven conclusions to inform sampling frequency and point selection.
- Regulatory context
- Alignment with European directives on official controls for contaminants.
- Inputs to ISO 24333 development and national implementation considerations.
Practical applications and intended users
This technical report is practical for organizations and professionals involved in cereal quality control and regulatory compliance:
- National and regional food control authorities designing official sampling schemes for mycotoxin surveillance.
- Laboratories and analytical providers establishing sample-receipt and homogenization procedures to reduce measurement uncertainty.
- Grain traders, processors and storage operators implementing representative sampling at intake (lorries), in storage (silos) and during transfer (flowing grain).
- Standards committees and auditors using empirical evidence for harmonized standards (e.g., ISO 24333) and inspection protocols.
Related standards
- ISO 24333 (sampling of cereals) - ISO/TR 29263 informed its drafting.
- Other ISO/CEN standards on food sampling and mycotoxin analysis may be relevant for full compliance.
Keywords: ISO/TR 29263:2021, grain sampling, cereal sampling, sampling protocol, mycotoxins, DON, OTA, ISO 24333, sampling uncertainty, sample comminution, lorry sampling, silo sampling.