Membranes for Microbiological Control
To protect the consumer, the absence of microbial contamination in foods and beverages, pharmaceuticals and cosmetics must be assured.
In these products the microorganism counts are very low and are therefore determined quantitatively via enrichment methods. Production processes are monitored continuously at their critical points (tanks, pipelines, filling units) as are the finished products. The membrane filtration method is the optimal analytical method for doing this.
Method
The liquid is filtered through a membrane. The microorganisms collect on the membrane surface. The filter is incubated on a nutrient medium and the individual colonies can then be evaluated. The method is also suitable for large sample volumes and low microorganism counts.
Reliability
The quality control and product design of our membrane filters are strictly controlled and offer users significant advantages.
Test parameters
All membranes used for microbiological quality control are tested systematically in order to ensure the same high quality from batch to batch. Parameters tested are bubble point, flow rate, bacterial retention, recovery rate, and sterility.
MicroPlus Membranes
Features and benefits
- Special membrane filters made from cellulose nitrate developed for microbiological quality control
- High mechanical strength
- High flow rate
- Sterile, individually packed
- All membrane filters have a high-contrast grid (3.1 mm)
- Type STL in dispenser boxes with 100 numbered membrane filters for easy removal and safe handling with the Membrane-Butler (supplied in 4 boxes each with 100 membrane filters)
ME Membranes
Features and benefits
- Made from mixed cellulose esters
- Economical
- Specifically for aqueous solutions
- Hydrophilic
- For use up to 125ºC
- Sterile, individually packed
- All membrane filters have a high-contrast grid (3.1 mm)
- Type STL in dispenser boxes with 100 numbered membrane filters for easy removal and safe handling with the Membrane-Butler (supplied in 4 boxes each with 100 membrane filters)
For a wider choice of membranes, please refer to the Membrane Filters section.
| Ordering Information - MicroPlus and ME Membranes |
| Catalog Number |
Description |
MicroPlus (Cellulose Nitrate) |
|
| 10407112 |
MicroPlus-21 STL membrane circles white, 47 mm, cellulose nitrate, 0.45 µm, 3.1 mm black grid, sterile, for Membrane-Butler, 400/pk |
| 10407114 |
MicroPlus-21 STL membrane circles white, 50 mm, cellulose nitrate, 0.45 µm, 3.1 mm black grid, sterile, for Membrane-Butler, 400/pk |
| 10407713 |
MicroPlus-21 ST membrane circles white, 47 mm, cellulose nitrate, 0.45 µm, 3.1 mm black grid, sterile, 100/pk |
| 10407714 |
MicroPlus-21 ST membrane circles white, 50 mm, cellulose nitrate, 0.45 µm, 3.1 mm black grid, sterile, 100/pk |
| 10407132 |
MicroPlus-31 STL membrane circles black, 47 mm, cellulose nitrate, 0.45 µm, 3.1 mm white grid, sterile, for Membrane-Butler, 400/pk |
| 10407134 |
MicroPlus-31 STL membrane circles black, 50 mm, cellulose nitrate, 0.45 µm, 3.1 mm white grid, sterile, for Membrane-Butler, 400/pk |
| 10407734 |
MicroPlus-31 ST membrane circles black, 50 mm, cellulose nitrate, 0.45 µm, 3.1 mm white grid, sterile, 100/pk |
| 10407170 |
MicroPlus-41 STL membrane circles green, 47 mm, cellulose nitrate, 0.45 µm, 3.1 mm black grid, sterile, for Membrane-Butler, 400/pk |
| 10407172 |
MicroPlus-41 STL membrane circles green, 50 mm, cellulose nitrate, 0.45 µm, 3.1 mm black grid, sterile, for Membrane-Butler, 400/pk |
ME (Mixed Cellulose Ester) |
|
| 10407312 |
ME25/21 STL membrane circles white, 47 mm, mixed esters, 0.45 µm, 3.1 mm black grid, sterile, for Membrane-Butler, 400/pk |
| 10407314 |
ME25/21 STL membrane circles white, 50 mm, mixed esters, 0.45 µm, 3.1 mm black grid, sterile, for Membrane-Butler, 400/pk |
| 10406870 |
ME25/21 ST membrane circles white, 47 mm, mixed esters, 0.45 µm, 3.1 mm black grid, sterile, 100/pk |
| 10406871 |
ME25/21 ST membrane circles white, 47 mm, mixed esters, 0.45 µm, 3.1 mm black grid, sterile, 1000/pk |
| 10406872 |
ME25/21 ST membrane circles white, 50 mm, mixed esters, 0.45 µm, 3.1 mm black grid, sterile, 100/pk |
| 10406873 |
ME25/21 ST membrane circles white, 50 mm, mixed esters, 0.45 µm, 3.1 mm black grid, sterile, 1000/pk |
| 10407332 |
ME25/31 STL membrane circles black, 47 mm, mixed esters, 0.45 µm, 3.1 mm white grid, sterile, for Membrane-Butler, 400/pk |
| 10407334 |
ME25/31 STL membrane circles black, 50 mm, mixed esters, 0.45 µm, 3.1 mm white grid, sterile, for Membrane-Butler, 400/pk |
| 10407370 |
ME25/41 STL membrane circles green, 47mm, mixed esters, 0.45 µm, 3.1 mm black grid, sterile, for Membrane-Butler, 400/pk |
| 10407372 |
ME25/41 STL membrane circles green, 50 mm, mixed esters, 0.45 µm, 3.1 mm black grid, sterile, for Membrane-Butler, 400/pk |
| 10409470 |
ME25/41 ST membrane circles green, 47 mm, mixed esters, 0.45 µm, 3.1 mm black grid, sterile, 100/pk |
| 10409472 |
ME25/41 ST membrane circles green, 50 mm, mixed esters, 0.45 µm, 3.1 mm black grid, sterile, 100/pk |
| 10408712 |
ME24 membrane circles white, 47 mm, mixed esters, 0.2 µm, 3.1 mm black grid, sterile, for Membrane Butler, 400/pk |
| 10408714 |
ME24 membrane circles white, 50 mm, mixed esters, 0.2 µm, 3.1 mm black grid, sterile, for Membrane Butler, 400/pk |
| 10407324 |
ME25 membrane circles white, 50 mm, mixed esters, 0.45 µm, 5 mm black grid, sterile, for Membrane Butler, 400/pk |
| 10408915 |
ME27 membrane circles white, 50 mm, mixed esters, 0.8 µm, 3.1 mm black grid, sterile, for Membrane Butler, 100/pk |
|