Intended Use
For the selective separation and enumeration of enterococci in food and water.
Principle and Interpretation
Tryptone and peptone are the sources of nitrogen and essential growth factors. Yeast extract acts as well nitrogenous compounds and additionally the vitamin B12 complex. Sodium azide acts largely inhibits the growth of gram-negative bacteria while sparing enterococci, staphylococci and streptococci. Ox bile inhibits most gram positives but not enterococci. Enterococci hydrolyse esculin to esculetin and dextrose, which reacts with ferric citrate producing a brownish black precipitate around the colonies. Tolerance to bile and the ability to hydrolyze esculin is the traditional and reliable test for the identification of enterococci. (4). Sodium chloride maintains the osmotic balance of the medium and Agar is the solidifying agent.
Formulation
| Ingredients | /liter |
| Tryptone | 17.0g |
| Ox bile | 10.0g |
| Yeast extract | 5.0g |
| Sodium chloride | 5.0g |
| Peptone | 3.0g |
| aesculin | 1.0g |
| Ferric ammonium citrate | 0.5g |
| Sodium azide | 0.15g |
| Agar | 15.0g |
| pH 7.1±0.1 at 25°C | |
Preparation
Weigh 56.6g of dry powder of this product, add 1 L of distilled water or deionized water, stir, heat and boil until completely dissolved, and sterilize at 121℃ for 15 min.
Quality Control
Cultural characteristics observed after incubation at 35-37°C for 20-24hours.
| Quality control strains | Growth | Colony color |
| Enterococcus faecalis ATCC29212 | PR≥0.7 | Brown-black halo |
| Escherichia coli ATCC25922 | inhibited | Absence of brown-black halo |
Sorage and Shelf Life
Keep container tightly closed, store in a cool, dry place, away from bright light. Storage period of 3 years.
Precautions
1. When weighing the dehydrated medium, please wear masks to avoid causing respiratory system discomfort
2. Keep container tightly closed after using to prevent clumping.
Waste Disposal
Microbiological contamination was disposed by autoclaving at 121°C for 30 minutes.
Intended Use For the selective separation and enumeration of enterococci in food and water. Principle and Interpretation Tryptone and peptone are the sources of nitrogen and essential grow……
This kit provides a rapid spin column method for the isolation and purification of genomic DNA from both Gram-negative and Gram-positive bacteria in milk samples. It can also be used to process challenging milk samples such as Mastitic milk for example. The kit is highly sensitive and can isolate DNA from a cell density of as little as 10 bacteria contained in 1 mL of milk. Genomic DNA is isolated in 45 minutes, free of inhibitors and ready for any number of downstream applications including PCR, qPCR and Southern Blot analysis, sequencing and more.
Figure 1 / 3
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| Kit Specifications | |
| Maximum Milk Input | 1 mL |
| Time to Complete 10 Purifications | 1 hour |
| DNA Yield* | 500 ng to 8 μg |
| Bacteria Species Processed | Gram positive and Gram negative |
| Minimum Detection Limit | 10 bacteria in 1 mL of milk |
*The range of the DNA yield will vary depending upon a number of factors including bacterial species and type of milk (fat content and %)
Storage Conditions and Product Stability
All solutions should be kept tightly sealed and stored at room temperature. The Lysozyme should be stored at -20°C upon arrival, and the Resuspension Solution A should be stored at -20°C after addition of the lysozyme. The lyophilized Proteinase K should be stored at -20°C upon arrival and after reconstitution. This kit is stable for 1 year from the date of shipment.
| Component | Cat. 21550 (50 preps) |
|---|---|
| Resuspension Solution A | 6 mL |
| Buffer SK | 60 mL |
| Wash Solution A | 18 mL |
| Elution Buffer B | 15 mL |
| Proteinase K | 12 mg |
| Lysozyme (powder) | 120 mg |
| Spin Columns | 50 |
| Collection Tubes | 50 |
| Elution Tubes (1.7 mL) | 50 |
| Product Insert | 1 |
Description
The ExcelTaq™ 2X Fast Q-PCR Master Mix (SYBR, ROX) is a ready-to-use reagent with all the essential components for quantitative real-time PCR (qPCR) except primers and templates. The master mix contains a highly stable hot-start Taq polymerase in an optimized buffer with dsDNA specific SYBR green fluorescent dye. Consequently, the ExcelTaq™ 2X Fast Q-PCR Master Mix (SYBR, ROX) features high stability during storage, even at 37°C for weeks. In addition to high sensitivity and signal intensity, the ExcelTaq™ 2X Fast Q-PCR Master Mix (SYBR, ROX) performs a low background/ high specificity qPCR results, as well as a better compatibility with fast PCR program. With inert smart blue contrast dye, the ExcelTaq™ 2X Fast Q-PCR Master Mix (SYBR, ROX) is ready-to-use and greatly reduces pipetting errors, while largely improving the reproducibility of the process. The ExcelTaq™ 2X Fast Q-PCR Master Mix (SYBR, ROX) also includes ROX reference dye for normalizing the fluorescent reporter signal in real-time quantitative PCR. This master mix allows sensitive, precise amplification, real-time tracking of the amplification process, and simultaneous quantification for targeted DNA molecules.
Features
Storage
Protect from light.
Aliquot to avoid multiple freeze-thaw cycles.
-20°C for 12 months
The ExcelTaq™ 2X Fast Q-PCR Master Mix (SYBR, ROX) is a ready-to-use reagent with all the essential components for quantitative real-time PCR (qPCR) except primers and templates. The master mix contains a highly stable hot-start Taq polymerase in an optimized buffer with dsDNA specific SYBR green fluorescent dye. Consequently, the ExcelTaq™ 2X Fast Q-PCR Master Mix (SYBR, ROX) features high stability during storage, even at 37°C for weeks. In addition to high sensitivity and signal intensity, the ExcelTaq™ 2X Fast Q-PCR Master Mix (SYBR, ROX) performs a low background/ high specificity qPCR results, as well as a better compatibility with fast PCR program. With inert smart blue contrast dye, the ExcelTaq™ 2X Fast Q-PCR Master Mix (SYBR, ROX) is ready-to-use and greatly reduces pipetting errors, while largely improving the reproducibility of the process. The ExcelTaq™ 2X Fast Q-PCR Master Mix (SYBR, ROX) also includes ROX reference dye for normalizing the fluorescent reporter signal in real-time quantitative PCR. This master mix allows sensitive, precise amplification, real-time tracking of the amplification process, and simultaneous quantification for targeted DNA molecules.