The International Organization for Standardization (ISO) has published a standard for the microbiology of food and animal feeding stuffs, known as ISO 18593. This standard provides guidelines for the enumeration of microorganisms in food and animal feed, which is crucial for ensuring food safety and quality. In this review, we will discuss the key aspects of ISO 18593 and its significance in the field of microbiology.
Use sterilized tools and proper aseptic technique to prevent cross-contamination.
The number of microorganisms in the sample is calculated using the following formula: Use sterilized tools and proper aseptic technique to
For larger surface areas, swabs and contact plates are inefficient. ISO 18593 details the use of sterile sponges or cloths.
The standard outlines specific protocols depending on the type of surface being sampled (flat, irregular, large, or small) and the target microorganisms. 1. Contact Plate Method The standard outlines specific protocols depending on the
Heavy-duty options for large areas (typically over 100 cm²), allowing for a broader sweep of potential contamination. Why This Standard Matters
Determine sampling frequencies based on risk zones (Zone 1: direct food contact surfaces, vs. Zone 4: areas outside the production room). and easily accessible surfaces
: Because surface sampling results can vary, the standard emphasizes using data for trend analysis to observe hygiene improvements or declines over time. Scope Limitations It is important to note what ISO 18593 does not cover:
Ideal for flat, non-porous, and easily accessible surfaces, contact plates involve pressing an agar-filled dish directly against the surface.
: Specifies recommendations for sampling location, timing, and surface area to ensure representative results.