Whatman Membrane Filter ME25 0.45µm 90mm Pack of 50

£271.98 excl. VAT
£326.38
incl. VAT

SKU - 1130934

10401618

SKU -

1130934

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Description
Compatibility

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.