EN ISO 4833-1:2013/A1:2022 PDF

Overview

EN ISO 4833-1:2013/A1:2022 (CEN) is an amendment that clarifies the scope of the international standard ISO 4833-1:2013, titled Microbiology of the food chain - Horizontal method for the enumeration of microorganisms - Part 1: Colony count at 30 °C by the pour plate technique. The amendment (A1:2022) updates Clause 1 to specify the intended uses, limits and practical context for the colony count at 30 °C using the pour plate technique.

Key topics and requirements

• Horizontal method for enumeration of microorganisms that form colonies after aerobic incubation at 30 °C.
• Applicable sample types:
  • Products intended for human consumption
  • Products intended for animal feeding (including pets)
  • Environmental samples from food and feed production/handling areas
  • Samples from the primary production stage
• Minimum reliable counting guidance: technique is suitable where a plate yields at least 10 colonies, corresponding to levels greater than 10 cfu/ml (liquid) or 100 cfu/g (solid).
• Particularly suitable for:
  • Products requiring a low limit of quantification
  • Samples containing spreading colonies (e.g., milk and milk products with spreading Bacillus species)
  • Samples containing oxygen-sensitive bacteria (e.g., some lactic acid bacteria developing during shelf life or in modified atmosphere storage)
• Limitations: the method’s suitability for certain fermented foods and some animal feeds may be limited; in such cases, alternative media or incubation conditions may be more appropriate. Modifications to adapt the method should be minimal so they do not significantly deviate from the horizontal method.

Applications and users

Who uses EN ISO 4833-1:2013/A1:2022:

• Food and feed microbiology laboratories performing routine enumeration
• Quality assurance and QC teams in food manufacturing and dairy sectors
• Feed producers and primary producers (on-farm testing strategy guidance)
• Environmental monitoring teams in production and handling areas
• Regulatory laboratories and conformity assessment bodies that rely on standardized colony counts

Practical uses:

• Routine total viable count testing for product release and shelf-life studies
• Troubleshooting contamination where spreading organisms or oxygen-sensitive bacteria are suspected
• Baseline monitoring at primary production and processing environments

Related standards

• This amendment is part of the ISO 4833 series (horizontal methods for colony counting) and is endorsed by CEN as EN ISO 4833-1:2013/A1:2022. Users should consult other parts of the ISO 4833 series and relevant food microbiology standards for complementary methods and specific organism testing.

Keywords: EN ISO 4833-1:2013/A1:2022, colony count at 30 °C, pour plate technique, microbiology of the food chain, enumeration of microorganisms, food microbiology, cfu/ml, cfu/g.