ISO 4833-1-2013 PDF

Full title and description

Microbiology of the food chain — Horizontal method for the enumeration of microorganisms — Part 1: Colony count at 30 °C by the pour plate technique. This International Standard specifies a pour-plate (gietplaat) technique for aerobic colony counting after incubation at 30 °C, intended for enumeration of microorganisms in food, animal feed and related environmental samples in the food chain.

Abstract

ISO 4833-1:2013 defines a horizontal colony-count method using pour plates for microorganisms that grow and form colonies under aerobic incubation at 30 °C. It is applicable to products for human consumption and animal feed and to environmental samples from food/feed production and handling. The method is suitable where a low detection limit or control of spreading colonies is required but may give different results than surface-plating methods for some matrices.

General information

• Status: Published (with an amendment clarifying scope issued in 2022).
• Publication date: 2013 (published September 2013, Edition 1).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 07.100.30 (Food microbiology).
• Edition / version: Edition 1 (2013); see ISO 4833-1:2013/Amd 1:2022 for scope clarification.
• Number of pages: 9 (core document).

Key bibliographic and lifecycle details as recorded by ISO and national bodies (publication month/year, edition, page count and amendment information).

Scope

This part of ISO 4833 specifies a horizontal method for enumeration of microorganisms able to grow and form colonies in a solid medium after aerobic incubation at 30 °C. It applies to products intended for human consumption or animal feed and to environmental samples in food and feed production and handling. The method is particularly applicable where low limits of detection are required or when spreading colonies (for example some Bacillus spp.) may obscure other colonies; for some fermented or heat-sensitive products alternative media or incubation conditions may be more appropriate.

Key topics and requirements

• Technique: pour-plate (gietplaat) inoculation into molten/tempered agar followed by aerobic incubation at 30 ±1 °C.
• Purpose: enumeration of total aerobic colony-forming units (CFU) for foods, feeds and environmental samples where this approach is suitable.
• Detection limits and applicability: suitable where low limits of detection are needed (examples in the standard refer to levels below about 10^2/g or 10^2/ml for liquids and below about 10^3/g for solids for routine sensitivity requirements).
• Counting rules: selection of appropriate dilutions to obtain countable plates (minimum recommended colony counts per plate), calculation of CFU per unit mass or volume, and handling of plates with spreading colonies.
• Quality and laboratory practice: used in conjunction with general microbiology guidance and sample preparation standards (see related standards) and with laboratory quality systems and incubation, media and diluent controls.
• Limitations: may give different results compared with surface-plating methods (ISO 4833-2) for some matrices; not always optimal for heat-sensitive organisms or when colony morphology on the surface must be distinguished.

Typical use and users

Routine food and feed microbiology laboratories, quality control and assurance teams in food manufacturing, regulatory and inspection laboratories, contract testing labs and research groups use ISO 4833-1 for enumeration of viable aerobic microorganisms when the pour-plate approach is appropriate (low detection limit, presence of spreading colonies). Users combine this standard with sample-preparation and laboratory practice standards to produce reliable, accredited results.

Related standards

Key related standards commonly used alongside ISO 4833-1 include:

• ISO 4833-2:2013 — Horizontal method for the enumeration of microorganisms — Part 2: Colony count at 30 °C by the surface plating technique (alternative method; surface plating and spiral platers described).
• ISO 6887 (series) — Preparation of test samples, initial suspension and decimal dilutions for microbiological examination (sample preparation rules that underpin enumeration methods).
• ISO 7218 (general requirements/guidance for microbiological examinations) and other ISO microbiology and media performance standards — used for laboratory procedures, validation and quality assurance.

Keywords

Microbiology; food microbiology; colony count; pour plate; pour‑plate technique; aerobic count; CFU; enumeration; food testing; animal feed; ISO 4833; ISO 4833-1:2013.

FAQ

Q: What is this standard?

A: ISO 4833-1:2013 is an International Standard that specifies a horizontal pour-plate method for enumerating aerobic microorganisms in food, feed and related environmental samples after incubation at 30 °C.

Q: What does it cover?

A: It covers the pour-plate technique (inoculation into molten/tempered agar), incubation at 30 °C, selection of dilutions and plate-counting rules to calculate CFU per g or ml, applicability and limitations of the method for different product types.

Q: Who typically uses it?

A: Food and feed testing laboratories, QC/QA teams in manufacturing, regulatory testing labs and research laboratories that require standardized colony counts where the pour-plate method is appropriate.

Q: Is it current or superseded?

A: The 2013 edition of ISO 4833-1 is published and remains in use; an amendment (ISO 4833-1:2013/Amd 1:2022) was issued to clarify scope. The ISO catalogue records the standard as published while noting lifecycle/revision activity for the 4833 series. Users should check their national or ISO catalog for the very latest status before regulatory use.

Q: Is it part of a series?

A: Yes — ISO 4833 is a multipart series. Part 1 (pour plate, 30 °C) and Part 2 (surface plating, 30 °C) are complementary horizontal methods; other guidance on sample preparation and laboratory practice (e.g., ISO 6887 series, ISO 7218) is typically used together with ISO 4833 parts.

Q: What are the key keywords?

A: Pour plate, colony count, aerobic count, food microbiology, CFU, enumeration, ISO 4833-1, 30 °C, food/feed testing.