ISO 11866-1-2005 乳和乳制品.推定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

标准号：ISO 11866-1-2005
中文标准名称：乳和乳制品.推定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*大可能数技术
英文标准名称：Milk and milk products - Enumeration of presumptive Escherichia coli - Part 1: Most probable number technique using 4-methylumbelliferyl-
标准类型：X16
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：X16
国际标准分类号：07.100.30; 67.100.01
适用范围：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.