ISO/TS 27265 | IDF/RM 228:2009规定了一种方法，用于在106°C下加热样品后，在55°C下使用菌落计数技术，对奶粉产品中嗜热菌的特殊耐热孢子的菌落形成单位（CFU）进行计数。 ISO/TS 27265 | IDF/RM 228:2009的适用范围仅限于将被重组并用于制造灭菌（如UHT或蒸煮处理）乳制品的全脂奶粉、脱脂奶和酪乳制品。

ISO/TS 27265|IDF/RM 228:2009 specifies a method for the enumeration of colony-forming units (CFU) of specially thermoresistant spores of thermophilic bacteria in dried milk products by using a colony-count technique at 55 °C after heating the sample at 106 °C. The applicability of ISO/TS 27265|IDF/RM 228:2009 is limited to dried whole milk, skim milk, and buttermilk products that are destined to be recombined and used in the manufacture of sterilized (e.g. UHT or retort-treated) milk products.