Intended Use
For the enumeration of enterococci in water and other liquids by the membrane filtration technique.
Principle and Interpretation
The growth of the entire accompanying Gram-negative microbial flora is inhibited by sodium azide. Enterococci reduce 2,3,5-Triphenyl tetrazolium chloride (TTC) to give a red formazan inside the bacterial cell, their colonies are thus red. Nitrogen, minerals, and amino acids are provided by the tryptose whilst yeast extract supplies vitamins. Glucose acts as the carbon source, dipotassium phosphate buffers the medium, and agar-agar is the solidifying agent.
Formulation
| Ingredients | /liter |
| Tryptose | 20.0g |
| Yeast extract | 5.0g |
| Glucose | 2.0g |
| Disodium hydrogen phosphate | 4.0g |
| Sodium azide | 0.4g |
| 2,3,5-Triphenyl Tetrazolium chloride | 0.1g |
| Agar | 10.0g |
| pH 7.2±0.1 at 25°C | |
Preparation
Dissolve 41.5 g in 1 L of purified water. Heat in boiling water and agitate frequently until completely dissolved. Sterilize by further heat for 20 minutes in the boiling water bath.
Quality Control
Cultural characteristics observed after incubation at 34-38°C for 40-48hours
| Quality control strains | Growth | Colony color |
| Enterococcus faecalis ATCC29212 | Good growth,PR≥0.5 | deep red coloured colonies |
| Escherichia coli ATCC25922 | Total inhibition | – |
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 enumeration of enterococci in water and other liquids by the membrane filtration technique. Principle and Interpretation The growth of the entire accompanying Gram-neg……
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Flex Prep empowers users to start with semi-automated, routine pipetting and seamlessly scale up to full automation as their needs grow. Compatible with additional Opentrons Flex Pipettes and Modules for scaling up to full automation.
Prices listed here are valid in the US and select other territories. Please get in touch with your local team for pricing for your territory.
Flex Prep offers an affordable entry point into automation, combining easy-to-install hardware with an intuitive walk-up-and-operate interface
Flex Prep empowers users to start with semi-automated, routine pipetting and seamlessly scale up to full automation as their needs grow. Compatible with additional Opentrons Flex Pipettes and Modules for scaling up to full automation.
Prices listed here are valid in the US and select other territories. Please get in touch with your local team for pricing for your territory.
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The Opentrons Flex 96-Channel pipette enables accurate high throughput pipetting, optimized for working in 96-well plates. Flex Pipettes use air displacement technology to offer highly accurate pipetting with pipette volume ranges from 5 – 1000 μL.
Smart sensors support automatic calibration, real-time positioning, and error detection. The 96-channel pipette occupies both pipette mounts and can easily be removed and swapped to an alternate pipette configurations to adapt your workflow needs.
Four 96-Channel Tip Rack Adapters are included with the purchase of one Flex 96-Channel Pipette.