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- Whatman Membrane Filter ME25 0.45µm 50mm Pack of 100
Whatman Membrane Filter ME25 0.45µm 50mm Pack of 100
- £130.58 excl. VAT
- £156.70incl. VAT
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Print Page- Mixed Cellulose Ester (MCE) membranes
- hydrophilic
- 50mm diameter
- 0.45µm pore size
These non-sterile mixed cellulose ester (MCE) membrane filters from are suitable for culturing, enumeration of bacteria and other cell counting methods. This range have a 0.45 micron pore size.
Composed of cellulose acetate and cellulose nitrate, giving the membrane a more uniform surface than pure nitrocellulose filters.
MCE filters support microbiology applications such as E.coli culturing. The porous membrane structure enables uptake of growth media to the bacterial colonies without chemically inhibiting their growth.
- Supports visual enumeration of bacteria
- Appropriate for bacterial culturing, including E.coli
- Biologically inert with good thermal stability
- Uniform microporous structure results in high flow rates when used for filtering
For microbiological quality control the membrane filter method is the optimal analytical method.
ME TYPE
- economical
- suitable for aqueous solutions
- hydrophilic
- can be used up to 125°C
- autoclavable up to 121°C
These membranes are characterized by a smoother and more uniform surface than pure nitrocellulose filters. Also, the color contrast provided by the filter surface facilitates particle detection and minimizes eye fatigue. The ME range has a lower cellulose acetate content compared to the WME range of membranes.
Guide to…Membrane Filter Properties
Identifying the filter material most suitable for your application based upon the nature of the liquid or gas you are filtering will ensure the best performance of your filter. Each membrane filter material has differing chemical and physical properties such as hydrophobicity, flow rate, extractables and protein retention making them suited to differing applications. Once you have selected the most compatible filter material, you will need to consider what pore size is most appropriate.
| Membrane Material | Protein binding | Hydrophilic/Hydrophobic | Chemical resistance | Applications |
| Hydrophilic PTFE | Low | Hydrophilic | High | Purification of HPLC organic and solvent/aqueous solutions |
| Hydrophobic PTFE | Low | Hydrophobic | High | Filtration of solvents |
| PES | Low | Hydrophilic | Low/Medium | Purification of tissue culture solutions, buffers |
| PVDF | Low | Hydrophilic | Medium | Filtration of protein solutions |
| NYL | Medium | Hydrophilic | Medium | Filtration of aqueous and solvent/aqueous mixtures |
| CA | Low | Hydrophilic | Low | Filtration of protein solutions |
| CN | High | Hydrophilic | Low | Filtration of aqueous solutions where protein binding is not a concern and microbioloigical applications. |
| RC | Low | Hydrophilic | Medium | Filtration of aqueous and organic solvents and protein recovery applications. |
