BS ISO 11866-1:2006
牛奶和乳制品.大肠杆菌的推测计数.用4-甲基伞形酮-β-D-葡萄糖醛酸苷(MUG)的最适计数技术

Milk and milk products - Enumeration of presumptive Escherichia coli - Most probable number technique using 4-methylumbelliferyl--D-glucuron ide(MUG)

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标准号

BS ISO 11866-1:2006

发布

2006年

发布单位

英国标准学会

当前最新

BS ISO 11866-1:2006

 

 

被代替标准

BS ISO 11866-1:1997 BS ISO 11866-2:1997

适用范围

This part of ISO 11866⎪IDF 170 specifies a combined method for the enumeration of presumptive Escherichia coli and of presumptive coliforms by means of a culture technique involving a liquid medium with MUG, and calculation of the number of presumptive Escherichia coli and/or coliforms per gram or per millilitre by the most 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 of several 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 low numbers of presumptive Escherichia coli and/or other presumptive coliforms (less than 100 per gram or 10 per millilitre) are suspected.

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