产品名称: | 葡萄球菌培养基110号;明胶甘露醇氯化钠琼脂 |
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英文名称: | Staphylococcus Medium No.110;Gelatin Mannitol Salt Agar |
培养基类型: | 选择性培养基 |
级别: | for microbiology |
品牌: | ELITE-MEDIA(艾礼培养基) |
产品目录号: | M234-01、M234-02 |
产品规格: | 250g、500g |
产品外观: | 米色均一粉末。 |
颜色与澄清度: | 浅琥珀色凝胶。 |
保存条件: | 密封,2-25°C避光保存。 |
注意事项: | 避免摄入、吸入、皮肤接触。 |
相关产品: | -- |
产品描述:
葡萄球菌培养基110号(Staphylococcus Medium No.110)也称明胶甘露醇氯化钠琼脂(Gelatin Mannitol Salt Agar),用于分离和鉴别致病 性金黄色葡萄球菌。该培养基配方是《细菌学分析手册》引用配方,被FDA、AOAC和APHA推荐推荐用于检测食品中的致病性金黄色葡萄球菌。工作原理
葡萄球菌培养基110号的鉴别能力基于金黄色葡萄球菌的以下四个能力:高盐耐受力,色素生成能力,发酵甘露醇产酸,明胶酶活性。
引起食物中毒的金黄色葡萄球菌具有明胶酶活性,能够产生橘色色素,嗜血,凝固酶阳性,发酵甘露醇。凝固酶阳性的致病性金黄色葡萄球菌 能够在高盐甘露醇培养基上形成橘色菌落,发酵产酸,液化明胶。30°C培养可以加强色素生成。检测含有大量芽孢杆菌的肉类食品中的金黄 色葡萄球菌时,向培养基中添加选择性抑制剂叠氮化钠0.75 mM (4.875g/L)。
用途:
葡萄球菌培养基110号用于检测引起食物中毒的金黄色葡萄球菌。配方与配制方法
成分 | g/L |
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胰蛋白胨 | 10.0 |
酵母提取物 | 2.5 |
乳糖 | 2.0 |
甘露醇 | 10.0 |
磷酸氢二钾 | 5.0 |
氯化钠 | 75.0 |
明胶 | 30.0 |
琼脂 | 15.0 |
pH | 7.0± 0.2 |
配制方法:
1. 称取149.5g本品,加1000ml去离子水浸泡10min。
2. 加热煮沸至完全溶解。
3. 121°C灭菌15min。
4. 倒平板前将沉淀摇匀,均匀分配到每个培养皿中。
实验方法
Streak or smear the Staphylococcus Medium No.110 plate with the specimen and incubate for 43 hours at 35°C or for 48 hours at 30°C. Pigmented colonies are a deep orange colour, whilst non-pigmented colonies are white. Acid production from mannitol is best demonstrated by adding a drop of 0.04% bromothymol blue indicator to the sites of the individual colonies; yellow indicates acid production.
Gelatin hydrolysis may be demonstrated by adding a drop of a saturated aqueous solution of ammonium sulphate or, preferably, of a 20% aqueous solution of sulphosalicylic acid to an individual colony (’Stone reaction’). A positive `Stone reaction’ is denoted by the presence of a clear zone round gelatinase-producing colonies after 10 minutes’ contact with the reagent.
The above reactions may be conveniently performed using short sleeves, 5mm long and 10mm diameter, cut from polythene tubing. The sleeves act as receptacles for the reagents when placed over discrete colonies, and may be stored in 70% alcohol prior to use. Coagulase tests should not be carried out without first sub-culturing in Nutrient Broth No.2 or on Blood Agar Base.
生长情况
标准菌株 生长情况 菌落特征 金黄色葡萄球菌 ATCC25923 生长良好 乳白色菌落,明胶酶阳性,甘露醇阳性 大肠埃希氏菌 ATCC25922 不生长