ISO 11866-1:2005 乳和乳制品 推测大肠杆菌的菌落计数 第1部分：用4-甲基馓形酸-（β）-D-葡糖苷酸（MUG）进行检验的最大可能数技术

标准编号：ISO 11866-1:2005

中文名称：乳和乳制品 推测大肠杆菌的菌落计数 第1部分：用4-甲基馓形酸-（β）-D-葡糖苷酸（MUG）进行检验的最大可能数技术

英文名称：Milk and milk products — Enumeration of presumptive Escherichia coli — Part 1: Most probable number technique using 4-methylumbelliferyl-beta-D-glucuronide (MUG)

发布日期：2005-12

标准范围

This part of ISO 11866?IDF 170 specifies a combined method for the enumeration of presumptive Escherichiacoli and of presumptive coliforms by means of a culture technique involving a liquid medium with MUG, andcalculation of the number of presumptive Escherichia coli and/or coliforms per gram or per millilitre by themost probable number (MPN) technique after incubation at 30 °C.It is a more rapid method than that described in ISO 7251 as the incubation time is reduced (omission ofseveral enrichment steps).The method is applicable to-- milk, liquid milk products,-- dried milk, dried sweet whey, dried buttermilk, lactose,-- acid casein, lactic casein and rennet casein,-- caseinate and dried acid whey,-- cheese and processed cheese,-- butter,-- frozen milk products (including edible ices), and-- custard, desserts and cream.The method specified in this part of ISO 11866?IDF 170 is preferred for samples in which comparatively lownumbers of presumptive Escherichia coli and/or other presumptive coliforms (less than 100 per gram or 10 permillilitre) are suspected.

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