1 Scope
This Part of SN/T 2552 specifies the colony-count method of psychrophilic microorganisms at 6.5℃ and rapid colony-count method for assessment of psychrophilic microorganism quantity at 21℃.
This Part is applicable to the colony-count of psychrophilic microorganisms in raw milk, pasteurized milk and other heat-treated milk; other milk and dairy products may be implemented by reference to this Part.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest editions of the normative documents (including all the amendments) are applicable to this document.
SN/T 2552.1 Microbiological Examination Method for Milk and Milk Products Hygiene - Part 1: Guidance on Sampling
SN/T 2552.2 Microbiological Examination Method for Milk and Milk Products Hygiene - Part 2: Preparation of Test Samples, Initial Suspensions and Decimal Dilutions
3 Terminologies and Definitions
For the purposes of this document, the following teminology and definition apply.
3.1
1 Scope
2 Normative References
3 Terminologies and Definitions
4 Principle
5 Equipment and Materials
6 Culture Medium and Reagents
7 Sampling
8 Procedures
9 Expression of Results
10 Repeatability
11 Result Report
12 Procedures
13 Expression of Results
14 Repeatability
15 Result Report
Appendix A (Normative) Milk Plate Count Agar Culture Medium
