产品名称: | 强化梭菌鉴别肉汤;DRCM培养基;DRCB培养基 |
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英文名称: | Differential Reinforced Clostridial Medium (ISO);Differential Reinforced Clostridial Broth (ISO);DRCB |
培养基类型: | 加富培养基 |
级别: | for microbiology |
品牌: | ELITE-MEDIA |
产品目录号: | M1254-01、M1254-02 |
产品规格: | 250g、500g(添加剂需另购) |
产品外观: | 麦秸色均一粉末。 |
颜色与澄清度: | 溶液呈红棕色,半透明。 |
保存条件: | 密封,2-30ºC保存。 |
注意事项: | 避免呼入和皮肤接触。 |
相关产品: | -- |
产品描述:
强化梭菌鉴别肉汤(Differential Reinforced Clostridial Medium)简称DRCM培养基,用于培养和计数厌氧菌的芽孢,也用于梭状芽孢杆菌的MPN法计数。用途:
DRCM培养基用于厌氧型细菌芽孢的分离和增菌,特别是梭状芽孢杆菌。DRCM培养基被用于MPN法测定单位体积的样品中厌氧菌(尤指梭状芽孢杆菌)的含量。
向DRCM培养基中加入刃天青(0.002 g/L),可以增加培养基的鉴别功能。
向DRCM培养基中添加多粘菌素B(70000 IU/L)能够抑制不产芽孢的革兰氏阴性菌的生长,提高培养基的选择性。
原理:
强化梭菌鉴别培养基是针对MPN(Most Probable Number)计数方法而设计的培养基。配方中的蛋白胨、酵母提取物、牛肉提取物和葡萄糖提供梭菌生长所需的营养成分。半胱氨酸作为还原剂。醋酸钠起缓冲作用和部分筛选作用。淀粉吸附代谢毒素。梭状芽孢杆菌能够将亚硫酸盐还原成硫化物,生产硫化铁。柠檬酸铁和和亚硫酸钠是硫化物指示系统,培养基变黑表明有硫化铁生成。刃天青钠是氧化指示剂,有氧条件下呈粉色,无氧条件下无色。配方与配制方法:
成分 | g/L |
胰蛋白胨 | 5 |
蛋白胨 | 5 |
牛肉提取物 | 8 |
酵母提取物 | 1 |
D-葡萄糖 | 1 |
水合醋酸钠 | 5 |
可溶性淀粉 | 1 |
L-半胱氨酸盐酸盐 | 0.5 |
焦亚硫酸钠 | 0.5 |
柠檬酸铁铵 | 0.5 |
刃天青钠 | 0.002 |
pH7.1±0.2 |
配制方法:
1. 称取30.1 g本品,加1 L去离子水溶解。
2. 边搅动边加热,煮沸1min,使其完全溶解。
3. 121ºC灭菌15min。
实验方法:
DRCM培养基必须使用当天配制的培养基。如果使用保存的旧培养基 ,应该重新加热脱氧。DRCM培养基只能重新加热一次。MPN法测定单位体积样品中梭菌的含量
首先要对待测样品进行一定的处理,如巴氏灭菌,除去其它具有硫化物生成能力的细菌的营养细胞。
接种
Add 50ml of sample to 50ml double strength medium (x5).
Add 10ml of sample to 10ml double-strength medium (x5).
Add 1ml of sample to 25ml single-strength medium (x5).
If required add 1ml of a 1 in 10 dilution of the sample to 25ml single-strength medium (x5). To qualitatively examine 100ml drinking/bottled water without performing MPN, add 100ml sample to 100ml double-strength medium.
If required, top up all bottles with single-strength medium to bring the volume of liquid level with the neck of the bottle, and to ensure that only a very small volume of air remains. Seal the bottles hermetically, or incubate under anaerobic conditions.
培养
Incubate aerobically with lids uppermost at 30ºC for 4-7 days.
Large volumes of culture in hermetically sealed glass bottles may explode due to gas production. The addition of iron wire, heated to redness and placed into the medium before inoculation, may aid anaerobiosis.
结果分析
Bottles in which blackening is observed, as a result of the reduction of sulphite and the precipitation of iron (II) sulphide, shall be regarded as positive.
菌种 |
拉丁名称 |
ATCC编号 |
生长情况 |
培养基是否变黑 |
大肠埃希氏菌 |
Escherichia coli |
ATCC25922 |
好 |
- |
蜡样芽孢杆菌 |
Bacillus cereus |
ATCC11778 |
一般 |
- |
产气荚膜梭菌 |
Clostridium perfringens |
ATCC10543 |
好 |
+ |
产气荚膜梭菌 |
Clostridium perfringens |
ATCC13124 |
好 |
+ |
产芽孢梭状芽孢杆菌 |
Clostridium sporogenes |
ATCC19404 |
好 |
+ |