Membrany z mieszaniny estrów celulozy, sterylne - 0.8 µm

Sterylne filtry membranowe z mieszaniny estrów celulozy, gładkie lub kratkowane, przeznaczone do rutynowego zliczania komórek oraz wykrywania cząstek.
• Sterile options available for critical applications.
• Excellent contrast for easier particle detection.
• Grids are nontoxic and do not inhibit bacterial growth, ensuring sample integrity.
• Black plain and black gridded membranes have a mix of cellulose nitrate and cellulose acetate.
• The membrane offers a high degree of internal surface area for greater adsorption of product.
• Higher dirt loading capacity.
• Biologically inert with good thermal stability.
• No surfactants to contaminate samples.
• Uniform microporous structure of membrane gives high flow rates.

Whatman mixed cellulose ester membranes are composed of cellulose acetate and cellulose nitrate. 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.

Eased counting process
In microbiological colony counting procedures, the color contrast between the surface and the colonies facilitates the counting process.

Plain or gridded
Many microbiological techniques include colony counting after incubation as the standard method of quantitation. Whatman gridded filters have clearly defined grid lines spaced at 3.1 mm or 5 mm intervals. The special ink used is nontoxic and completely free from bacterial growth inhibitors. Whatman black mixed cellulose esters are available plain for automatic colony counting applications, as well as gridded to assist in manual counting procedures. Black membranes provide contrast between residue or cell colors and the filter without having to counter-stain the membrane.

Sterile filters
For those laboratories preferring to use membranes sterilized by autoclaving for microbiological work, Whatman provides black gridded membranes in packs with pads ready for laboratory autoclaving.
Application The membrane is particularly effective in applications requiring higher flow rates and larger volume filtration including clarification or sterilization of aqueous solutions; particulate analysis and removal; air monitoring and microbial analysis Clarification or sterilization of aqueous solutions Cytology Air monitoring HPLC samples (aqueous) Virus concentration Particulate analysis Biological assays Food microbiology including enumeration of E. coli in foods Bacteriological studies Particle counting from liquids and aerosols Yeasts and molds 
Autoclavable Yes 
Color White 
Grid Dimension 3.1 mm
Interleaving Paper No 
Material Mixed Cellulose Ester (MCE) 
Membrane Type ME 28 
Operating temp. max. 130°C °C
Porosity Max. 77
Porosity Min. 74
Protein Binding Medium 
Solvent Resistance Medium 
Weight Max. 5.0 mg/cm
Weight Min. 4.3 mg/cm2 
Product Product Name Diameter Grid color With pad Pack size
10407342 ME27 (Mixed Cellulose Ester) Membrane Circle; black; 47 mm 0.8 µm; 3.1 mm; white grid; sterile; for Membrane-Butler 47 mm White No 400 pieces
10407615 ME27 (Mixed Cellulose Ester) Membrane Circle; black; 47 mm 0.8 µm; 3.1 mm; white grid; sterile; for Membrane-Butler 50 mm White No 400 pieces
10408915 ME27 (Mixed Cellulose Ester) Membrane Circle; white; 50 mm 0.8 µm; 3.1 mm black grid; sterile; for Membrane-Butler 50 mm Black No 100 pieces
10408970 Mixed Cellulose Ester Circle ME Range (ME 27) white/black grid 3.1 mm; sterile; 0.8 µm pore size; 47 mm 47 mm Black No 100 pieces
10409970 Mixed Cellulose Ester Circle ME Range (ME 27); white/black grid 3.1 mm with pad; sterile; 0.8 µm pore size; 47 mm 47 mm Black Yes 100 pieces