BS EN ISO 16649-3:2015规定了检测和计数-葡萄糖醛酸酶 阳性大肠杆菌，通过液体培养基培养技术和计算 在（37±1）°C下培养后的可能数（MPN），然后在（44±1）°C下培养。ISO 16649的这一部分是 适用于以下产品:供人类食用和动物饲养的产品；食品生产和食品处理领域的环境样本。该方法适用于可能受到压力的大肠杆菌细胞的计数 由于脱水、冷冻和暴露于盐水（如海洋）环境或损害而引起的 使用含氯产品等消毒剂。ISO 16649本部分的适用性受到该方法敏感性的限制 在很大程度上是可变性的。该方法旨在应用，结果将在 根据第11条给出的信息。尚未对所有基质（如牛奶和奶制品）对该方法进行全面评估。ISO 7251是 用于牛奶和奶制品。交叉引用:ISO 6887-1ISO 6887-2ISO 6887-3ISO 6887-4ISO 6887-5ISO 6887-6ISO 7218ISO 11133ISO 7251购买本文件时提供的所有当前修订版均包含在购买本文件中。

BS EN ISO 16649-3:2015 specifies a horizontal method for the detection and enumeration of?-glucuronidase positive Escherichia coli, by means of the liquid-medium culture technique and calculation of the most probable number (MPN) after incubation at (37 ± 1) °C, then at (44 ± 1) °C. This part of ISO 16649 is applicable to the following:products intended for human consumption and the feeding of animals;environmental samples in the area of food production and food handling.The method is suitable for the enumeration of cells of E. coli that might have been subjected to stress arising from dehydration, freezing, and exposure to a saline (such as marine) environment or damage by disinfectants such as chlorine-containing products.A limitation of the applicability of this part of ISO 16649 is imposed by the susceptibility of the method to a large degree of variability. The method is intended to be applied and the results interpreted in the light of the information given in Clause 11.This method has not been fully evaluated for all matrices (e.g. for milk and milk products). ISO 7251 is intended to be used for milk and milk products.Cross References:ISO 6887-1ISO 6887-2ISO 6887-3ISO 6887-4ISO 6887-5ISO 6887-6ISO 7218ISO 11133ISO 7251All current amendments available at time of purchase are included with the purchase of this document.