形式
liquid
质量水平
保质期
12 mo.
特点
ready-to-use
包装
ampule of 2 mL
pack of 50 tests
颜色
slightly opalescent green-blue
输入
sample type bottled water
sample type beer
sample type sport drink
sample type cider
sample type food(s)
sample type beverage(s)
sample type wine
sample type cosmetics
sample type soft drink
sample type beverage(s)
pH值（酸碱度）
5.5±0.2 (25.0 °C)
应用
environmental
food and beverages
industrial qc
microbiology
相容性
for use with MF-method
for use with Microfil®
for use with MicropreSure®
for use with Milliflex®
运输
wet ice
储存温度
2-8°C
适用性
bacteria
molds
yeasts
一般描述
Wallerstein Nutrient Broth is recommended for the isolation and cultivation of yeasts, molds and bacteria that grow in a low pH environment mainly in the beverage industry. Yeast extract in the medium is a source of trace elements, vitamins and amino acids. Peptone provides nitrogen, amino acids and carbon. Dextrose is a source of carbohydrates. Monopotassium phosphate buffers the media. Potassium chloride, calcium chloride, and ferric chloride are essential ions to help to maintain osmotic balance. Magnesium sulfate and manganese sulfate are sources of divalent cations. Bromocresol green is the pH indicator. The WL Nutrient medium plate incubated under aerobic conditions enables the growth of mainly yeast colonies, acetic acid bacteria, flavobacterium, proteus and thermophilic bacteria and under anaerobic condition enables the growth of lactic acid bacteria and Pediococcus. Bacterial colonies appear as non-pigmented to white, with a smooth or rough texture. Yeast appears as large creamy to white colonies.
应用
Wallerstein Nutrient Broth is used in the examination of materials encountered in brewing and for industrial fermentations containing mixed flora of yeast and bacteria. It is used in the beverage industry to detect bacteria, yeast, and mold in wines, beer and other fermentation products.
特点和优势
- Ready-to-use Liquid ampoule media solve numerous problems in microbiology laboratories where time, equipment, and trained personnel are often in short supply.
- They are available in convenient, single-test 2 mL plastic ampoules, eliminating the manipulation of glass ampoules and avoiding the waste and spoilage associated with bulk packaged media.
产品规格
Incubation Temperature: 35 °C ± 2 for bacteria; 30 °C ± 2 for yeasts and molds
Incubation Time: 48–72 hrs
分析说明
QC organisms
发酵乳杆菌 (ATCC 9338)
酿酒酵母 (ATCC 9763)
发酵乳杆菌 (ATCC 9338)
酿酒酵母 (ATCC 9763)
细菌菌落可显示为非色素至白色，具有平滑或粗燥纹理。 酵母显示为更大的乳白色、白色菌落。
Target Microorganisms: Lactic acid bacteria, yeast and mold
法律信息
MICROFIL is a registered trademark of Merck KGaA, Darmstadt, Germany
MICROPRESURE is a registered trademark of Merck KGaA, Darmstadt, Germany
MILLIFLEX is a registered trademark of Merck KGaA, Darmstadt, Germany
WGK
WGK 1
闪点(°F)
Not applicable
闪点(°C)
Not applicable
法规信息
动植物来源培养基
Paper read at American Society of Brewing Chemists Meeting
Green SR and Gray PP
Wallerstein Laboratories Communications, 12, 353-353 (1950)
Media for Isolation-Identification-Cultivation-Maintenance of Medical Bacteria
MacFaddin JF
Williams and Wilkins, 12, 353-353 (1985)
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