ISO 6887-4-2017 PDF

Full title and description

Microbiology of the food chain — Preparation of test samples, initial suspension and decimal dilutions for microbiological examination — Part 4: Specific rules for the preparation of miscellaneous products. This part of ISO 6887 gives product-specific rules and recommendations for preparing test portions, initial suspensions and decimal dilutions for a range of foods and food-related matrices that are not covered by the other, more specific parts of the ISO 6887 series.

Abstract

ISO 6887-4:2017 specifies rules for preparing samples and dilutions for the microbiological examination of specific food products not addressed in other parts of ISO 6887. It complements ISO 6887-1 (general rules) and excludes sample preparation steps when those are already specified in other organism- or method-specific standards. The document lists product categories (acidic products, hard/dry products, dehydrated/low-aw products, flours and cereal products, animal feed, gelatine, margarines/spreads, eggs and egg products, bakery goods, fresh fruit and vegetables, fermented products, beverages, and alternative protein products) for which it provides guidance.

General information

• Status: Published (International Standard, confirmed).
• Publication date: March 2017 (Edition 2, published March 2017; commonly listed with an implementation date of 15 March 2017).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 07.100.30 (Food microbiology).
• Edition / version: Edition 2 (2017).
• Number of pages: 16 (typical published PDF length; some national adoptions may show longer pagination for combined publications).

Key bibliographic/confirmation details above are taken from the ISO bibliographic entry and standard distributors.

Scope

ISO 6887-4:2017 provides specific rules for preparing test portions, initial suspensions and decimal dilutions for a wide range of miscellaneous products not covered by other parts of the ISO 6887 series. It is intended to be used together with ISO 6887-1 (general rules) and applies to product types including low-pH/acidic products, hard and dry products, dehydrated or freeze-dried and other low water-activity products (including those with inhibitory properties), flours and whole cereal grains, certain animal feeds and pet foods (kibbles, chews), gelatine (powdered/leaf), margarines and spreads and non-dairy products with added water, eggs and egg products, bakery products and pastries, fresh fruit and vegetables, fermented products and other products containing viable microorganisms, alcoholic and non-alcoholic beverages, and alternative protein products. The standard excludes sample preparation steps that are already specified in other, method-specific International Standards.

Key topics and requirements

• Guidance on representative test portion selection for heterogeneous or difficult matrices.
• Recommended procedures for producing the initial suspension and subsequent decimal dilutions for enumeration and detection methods (unless a specific method standard states otherwise).
• Special handling and diluent considerations for low water-activity and inhibitory matrices (e.g., rehydration, use of neutralizing diluents).
• Procedures for mechanically resilient or hard/dry products (e.g., fragmentation, grinding, rehydration where appropriate) to ensure representative microbial recovery.
• References to and reliance on ISO 6887-1 (general rules) and ISO 7218 (general requirements and guidance for microbiological examinations).

These topics reflect the document’s role in harmonizing pre-analytical sample preparation to improve inter-laboratory comparability of microbiological results.

Typical use and users

Primary users are food and feed microbiology laboratories, public health and food safety authorities, quality assurance teams in food manufacturing and processing, contract testing laboratories, and researchers developing or validating microbiological methods. The standard is used when preparing samples or dilutions for routine enumeration or detection of microorganisms in the listed miscellaneous product categories, and as a reference when national/regulatory methods do not provide specific preparation details.

Related standards

ISO 6887-4 is part of the ISO 6887 series and is used together with ISO 6887-1 (General rules). Other related parts include ISO 6887-2 (meat and meat products), ISO 6887-3 (fish and fishery products), ISO 6887-5 (milk and milk products) and ISO 6887-6 (samples taken at primary production). ISO 7218 (general requirements and guidance for microbiological examinations) is also commonly referenced in combination with ISO 6887 series documents.

Keywords

sample preparation, test portion, initial suspension, decimal dilutions, food microbiology, ISO 6887, dilution procedures, low water activity, dehydrated products, food testing, microbiological examination.

FAQ

Q: What is this standard?

A: ISO 6887-4:2017 is an International Standard that provides specific rules for preparing test samples, initial suspensions and decimal dilutions for microbiological examination of miscellaneous food and food-related products not covered by other parts of ISO 6887.

Q: What does it cover?

A: It covers product-specific preparation guidance (including rehydration, grinding, choice of diluents and neutralizers, and handling of low-aw or inhibitory matrices) for a broad list of miscellaneous products such as acidic foods, dried products, flours, eggs, bakery goods, beverages and alternative protein products. It does not replace preparation steps that are already detailed in other method-specific standards.

Q: Who typically uses it?

A: Food/feed microbiology laboratories, regulatory agencies, food industry QA/QC teams, and contract testing laboratories use it to standardize sample preparation and dilutions prior to microbiological analysis. Laboratories often apply it alongside ISO 6887-1 and organism- or method-specific standards.

Q: Is it current or superseded?

A: The 2017 edition (Edition 2) is published and listed as the current version; the ISO bibliographic entry indicates the publication in March 2017 and shows the standard as confirmed in subsequent periodic reviews. Users should check national catalogues or ISO for any later amendments or corrigenda before relying on it for regulatory compliance.

Q: Is it part of a series?

A: Yes — ISO 6887-4 is part of the ISO 6887 series (Microbiology of the food chain — Preparation of test samples, initial suspension and decimal dilutions for microbiological examination), which includes Parts 1 through 6 covering general rules and product-specific rules for meat, fish, milk, primary production and miscellaneous products.

Q: What are the key keywords?

A: Key keywords include sample preparation, initial suspension, decimal dilutions, food microbiology, low water activity, dehydrated foods, diluents, neutralizers, and representative test portion.