产品说明
一般描述
GranuCult® PEMBA agar is a selective culture medium containing two indicator systems, mannitol and bromothymol blue, and egg yolk. B. cereus does not utilize mannitol and forms precipitates of hydrolyzed lecithin from the egg yolk.
B. cereus grow as turquoise to peacock blue colonies, since the medium is slightly alkalized by its metabolites (bromothymol blue reaction). The yolk reaction (by lecithinase) also leads to a precipitate surrounding the colony, which appears in the color of the agar or similar to the colony. Growth and lecithinase activity are often so strong that the precipitation is already evident before a colony is visible.
Bacillus cereus is identified by colony morphology, color, and egg yolk hydrolysis. Microscopic examination of the cell and spore morphology and the formation of intracellular lipid globules in vegetative cells is a rapid method of confirmation.
Mannitol-positive bacteria form yellow colonies with a yellow zone in the surrounding medium.
应用
GranuCult® PEMBA agar is used for the selective isolation of viable presumptive Bacillus cereus from Food products and animal feeds and the environmental samples in the area of food production and food handling.
原理
Low concentration of nutrients and the selective inhibitory component polymyxin help to attain selectivity. Although, some Proteus spp. and Gram-positive cocci also grow in the medium. The low peptone level and the addition of the pyruvate improve the egg yolk precipitation and sporulation. Bromothymol blue acts as a pH indicator to detect mannitol utilization. Enzymatic digest of casein provides carbon and nitrogen sources. Sodium chloride maintains the osmotic balance of the medium, while agar is the solidifying agent.
附注
We offer two media types: the superior granulated GranuCult® and the cost-efficient powdered NutriSelect® culture media, depending on your needs.
The designations basic, plus, or prime are added to indicate the quality control level, from basic quality control to standard QC plus to prime for full regulatory compliance.
法律信息
GRANUCULT is a registered trademark of Merck KGaA, Darmstadt, Germany
NutriSelect is a registered trademark of Merck KGaA, Darmstadt, Germany
产品性质
| 质量水平 | 200 |
| agency | ISO 21871 |
| 无菌性 | non-sterile; Not processed or packaged aseptically |
| 形式 | medium granules |
| manufacturer/tradename | GranuCult® |
| pH range | 7.0 - 7.4 (25 ℃) |
| application(s) | food and beverages pathogen testing |
| 储存温度 | 15-25℃ |
| 适用性 | selective and differential for bacteria: Bacillus Cereus |
安全信息
| 象形图 |  |
| 警示用语： | Warning |
| 危险声明 | H317 - H319 |
| 预防措施声明 | P261 - P264 - P272 - P280 - P302 + P352 - P305 + P351 + P338 |
| 危险分类 | Eye Irrit. 2 - Skin Sens. 1 |
| 储存分类代码 | 11 - Combustible Solids |
| WGK | WGK 2 |
