Peptones, agars and ingredients
Skim Milk Powder
Skim milk is a source of lactose and casein and it may be added to different media for the cultivation and differentiation of microorganisms based on the coagulation and proteolysis of casein.
- Cat. No.
- LC-230
- Category
- Peptones, agars and ingredients
- Format
- 500 g
- Storage
- 2 to 25 °C
- Minimum guaranteed shelf life
- 6 months
- Standards
- ISO 6611
Skim Milk is used for preparing microbiological culture media as the Skim Milk Agar for detecting proteolytic microorganisms in food, including dairy products. When the powder is prepared in a 10% solution, this is equivalent to fresh skim milk which is a source of lactose and casein and other nutrients required for the growth of lactobacilli. Clostridial species can be differentiated based on their ability to enzymatically degrade proteins to peptones or coagulate milk.
Key features
Applications
Detection of lactose fermenters and proteolytic microorganisms.
Industry
Dairy products, food, ingredients for culture media, manufacturing process.
Standards
ISO 6611.
Preparation
100 g of powder in 1 L of distilled water; may be sterilized by autoclaving for 5 minutes at 121 °C, do not overheat.
Principles and uses
It can also be used to prepare Litmus Milk, a differential test medium for determining lactose fermentation and for detecting proteolytic enzymes that hydrolyze casein (milk protein) and cause coagulation (clot formation).
Technical specifications
| Ash | ≤ 8.5% |
|---|---|
| Moisture | ≤ 5% |
| Proteins | ≥ 33% |
| Fats | ≤ 1.50% |
| Amount per litre | 100 g |
| Storage | 2 to 25 °C |
Preparation and use
Preparation
Suspend 100 g of powder in 1 L of distilled water. Mix well and dissolve by heating with frequent agitation. May be sterilized by autoclaving for 5 minutes at 121 °C. Care should be taken not to overheat during sterilization, otherwise, caramelization will occur.
Quality control
| Test | Specification |
|---|---|
| Enterobacteria | ≤ 10 CFU/g |
| Total aerobic count | < 50,000 CFU/g |
| Listeria | Negative |
| Salmonella | Negative |
What you receive
The product
Shipped under controlled temperature when the product requires it.
Lot certificate
Every lot comes with its certificate.
Tracked shipment
Follow your shipment live, from our warehouse to your lab.
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Frequently asked questions
Can I ask for formats other than those listed?
Yes: custom formats and OEM packs are available on request. Tell us the quantities you need.
How do I see the prices?
Prices are shown after you sign in to the customer area, with your account discount already applied.
How long does delivery take?
We give you the availability with the quote, within 24 hours of your request.