SIST EN ISO 6887-4:2017 PDF

Overview - EN ISO 6887-4:2017 (Corrected 2021-03)

EN ISO 6887-4:2017 - part of the ISO 6887 series on the microbiology of the food chain - gives specific rules for preparing test samples, initial suspensions and decimal dilutions for microbiological examination of miscellaneous food products. Published by CEN/ISO, this part covers product types not treated in the other, more general parts of ISO 6887. It does not override preparation procedures already specified in other International Standards and excludes products introduced to market after its publication.

Key topics and technical requirements

The standard sets out practical, technical guidance for sample handling to ensure reproducible microbiological results. Main subjects include:

• Scope and principle for preparing initial suspensions and decimal dilutions for microbiological tests.
• Diluents: recommended media and preparation/sterilization rules, including peptone salt solution, buffered peptone water, double-strength buffered media and phosphate-buffered diluents.
• Enzyme solutions for sample processing: alpha‑amylase, cellulase and papain procedures.
• Apparatus and sampling: equipment and sample‑type considerations to ensure representative testing.
• Product‑specific preparation rules for a wide range of miscellaneous foods, including:
  • acidic (low pH) products
  • hard and dry products
  • dehydrated, freeze‑dried and low water‑activity (aw) products
  • flours, whole cereal grains and cereal by‑products
  • animal feed, kibbles and pet chews
  • gelatine (powdered and leaf)
  • margarines, spreads and non‑dairy products with added water
  • eggs and egg products
  • bakery goods, pastries and cakes
  • fresh fruit and vegetables
  • fermented products or those containing viable microorganisms
  • alcoholic and non‑alcoholic beverages
  • alternative protein products (e.g., cooked insects, textured vegetable protein, mycoprotein)
• Specific procedures such as resuscitation of dehydrated organisms, de‑gassing beverages, and water‑activity considerations.
• Further dilutions and performance testing of diluents to support downstream enumeration and detection methods.

Applications and who uses it

This standard is intended for:

• Food microbiology laboratories performing routine testing, pathogen detection and microbial enumeration.
• Quality assurance/quality control teams in food manufacturing (bakeries, beverage producers, pet food, alternative protein manufacturers).
• Regulatory authorities and auditors assessing sampling and sample‑preparation procedures.
• Method developers and test kit manufacturers ensuring compatibility with internationally accepted sample prep rules.

Practical benefits include improved reproducibility, standardized sample processing across labs, and clearer handling rules for challenging matrices (low aw, high fat, fermented products).

Related standards

• ISO 6887‑1: general rules for preparation of the initial suspension and dilutions (reference companion).
• Other parts of ISO 6887 address broader product categories and may supersede specific preparation steps when referenced.

Keywords: EN ISO 6887-4:2017, microbiology of the food chain, sample preparation, initial suspension, decimal dilutions, food microbiology standard, diluents, ISO 6887-1.