GB 4789.28-2024 English PDF (GB4789.28-2024)

This standard specifies the quality requirements for culture media and reagents used in food microbiology testing. This standard applies to the quality control of culture media and reagents for food microbiology testing. 2 Terms and definitions 2.1 Quality control Technical operations and activities undertaken to meet quality requirements. 2.2 Lots of media and reagents The complete traceability unit of culture media and reagents, which refers to a certain number of products produced in a specific production cycle and meeting production quality requirements. These products have the same batch number. 2.3 Performance of media and reagents The reaction of culture media and reagents to the test strain under certain conditions. 2.4 Culture medium Substances in liquid, semi-solid or solid form, containing natural or synthetic ingredients, used to ensure the reproduction, identification or maintenance of vitality of microorganisms. 2.5 Liquid culture medium A culture medium consisting of an aqueous solution containing one or more GB 4789.28-2024 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery. Page 6 of 100 components (e.g. buffered peptone water). 2.6 Solid media A culture media, which is formed by adding certain amount of solidified material (such as agar) to the liquid culture medium, after boiling or moist heat sterilization, cooled to room temperature and solidified. Solid culture medium poured into a petri dish is generally called a and quot;plate and quot;; solid culture medium poured into a test tube and placed at an angle is often called a and quot;slant and quot;, when the culture medium solidifies. 2.7 Semi-solid medium A culture media, which is formed by adding a small amount of solidified matter (such as agar) to the liquid culture medium, after boiling or moist heat sterilization, semi-solidified after cooling. 2.8 Transport media A culture medium, that protects and maintains microbial activity after sampling and before laboratory processing, AND does not allow obvious proliferation ...