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TTC卵磷脂-吐温80-营养琼脂
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更新时间:2016-06-17  |  阅读:2118

详情介绍

TTC卵磷脂-吐温80-营养琼脂 TTC Lecithin Tween80 Nutrient Agar 250g 用于化妆品中细菌总数测定。

用途:用于化妆品中细菌总数测定(GB标准)

TTC卵磷脂-吐温80-营养琼脂 配方:(g/L)
蛋白胨
牛肉浸粉
氯化钠
卵磷脂
吐温80       
TTC                         
琼脂                       
pH值7.1-7.2 

20.0
3.0
5.0
1.0
7.0
0.05
15.0
25℃

原理:
         蛋白胨和牛肉浸粉提供碳氮源、维生素和生长因子;氯化钠维持均衡的渗透压;卵磷脂和吐温80能中和防腐剂,并能起到在乳浊液中分散物质的功能,卵磷脂能中和季铵盐,吐温80可中和酚、六氯酚、福尔马林,两者结合可中和乙醇;琼脂是培养基的凝固剂;大多数细菌能还原TTC,使之形成易于辨别的红色菌落,TTC还能减缓某些细菌的蔓延生长。
用法:
        称取本品 51.1g ,溶解于 1000ml  蒸馏水中, 121℃高压灭菌 15 分钟 ,备用。
质量控制:

 在36±1℃培养18-24小时。

质控菌株
ATCC
生长情况
菌落颜色
金葡萄球菌
25923
(10-7)+++
红色
大肠杆菌
25922
(10-7)+++
红色
单增李氏菌
27853
(10-7)+++
红色
沙门氏菌
14028
(10-7)+++
红色

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