Membrane filtration

	International	+32 (0) 16 58 90 45	+32 (0) 16 50 90 45
	France	01 43 25 01 50	01 43 25 01 60
	Italy	02 36 00 65 93	02 36 00 65 94
	Germany	0241 6085 13140	0241 6085 33033
Back Up Next

Membrane filtration

The technical requirements for membrane filters used in microbiological quality control are subject to strict national and international standards.

At the same time the requirements of the market are continually changing as a result of the introduction of new products, such as soft drinks, alcoholic mixed drinks or pharmaceuticals.

Whatman offers a wide and versatile range of membrane filter products with a very high level of consistent quality

Product Navigation



> Removing a sterile membrane from Butler E.

Membrane-Butler
Membrane filter dispenser for microbiological control
Membrane filters for microbiological checks must be carefully handled to ensure that they remain sterile and that quantitative results are being obtained.



> Manual Dispenser for single sterile membranes

The Membrane Butler offers optimal handling for all MicroPlus and ME membrane filters with the type name "STL". The dispenser box is placed in the Membrane Butler, the sterile packing is inserted into the roller system and the system is ready. With each turn (Manual Butler) or by pressing the push button (Butler E) a membrane filter is removed from its sterile packing and can easily be removed with forceps.

Features and Benefits

High reliability
Simple handling with foot switch and stepper motor (applies only to Butler E)
Cross-contamination risks are minimised
Membrane dispensed rapidly
Ideal for use on sterile benches
Compact dimensions for portable use

Membrane-Butler Workflow

1. Insert the membrane package in the support.

2. Guide the sterile packing through the transportation rollers so that two sections protrude.

3. Reinsert the guidance clip.

4. By pressing the push button the signal for the feed operation is started and the membrane can be removed.

Ordering Information - Membrane-Butler
Catalogue Number	Description	Use	Quantity/Pack
10 477 100	Membrane-Butler	Manual dispenser	1
10 477 110	Membrane-Butler E	Electrical dispenser	1
10 477 112	Butler Tower	For two Butler E	1
10 477 113	Foot pedal	For Butler E automatic dispensing	1

MicroPlus and ME membranes
Membranes for microbiological control
The absence of microbial contamination in beverages, cosmetics and pharmaceuticals is a very important factor in quality control. It protects the consumer.

In these products the microorganism counts are very low and are therefore determined quantitatively via enrichment methods. Production processes are continuously monitored at their critical points (tanks, pipelines, filling units), as are the finished products. The membrane filter 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

Our quality control and product design offer you the decisive advantages. The membrane filters are strictly controlled and fulfil or exceed the requirements according to DIN, ASTM, and HIMA.

Test parameters

The following parameters of all membranes used for microbiological quality control are systematically tested in order to ensure the same high quality from batch to batch: bubble pressure for bacterial growth; flow rate for bacterial retention; thickness for porosity toxicology.

MicroPlus Membranes

Features and Benefits

Special membrane filters made from cellulose nitrate developed for microbiological quality control
High mechanical strength
Double flow rate
Ideal for samples with a high particle content and viscous samples
Sterile, individually packed
Pore size 0.45 µm
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

Economical
Specially for aqueous solutions
Hydrophilic
For use up to 125º C
Autoclavable up to 121º C

Ordering Information - MicroPlus
Catalogue Number	Description	Colour / Grid	Diameter (mm)	Quantity/Pack
10 407 112	MicroPlus-21 STL	white / black	47	4 x 100
10 407 114	MicroPlus-21 STL	white / black	50	4 x 100
10 407 713	MicroPlus-21 ST	white / black	47	1 x 100
10 407 714	MicroPlus-21 ST	white / black	50	1 x 100
10 407 132	MicroPlus-31 STL	black / white	47	4 x 100
10 407 134	MicroPlus-31 STL	black / white	50	4 x 100
10 407 734	MicroPlus-31 ST	black / white	50	1 x 100
10 407 170	MicroPlus-41 STL	green / black	47	4 x 100
10 407 172	MicroPlus-41 STL	green / black	50	4 x 100
ME (Mixed cellulose ester)
10 407 312	ME 25/21 STL	white / black	47	4 x 100
10 407 314	ME 25/21 STL	white / black	50	4 x 100
10 406 870	ME 25/21 ST	white / gridded	47	1 x 100
10 406 872	ME 25/21 ST	white / gridded	50	1 x 100
10 407 332	ME 25/31 STL	black / white	47	4 x 100
10 407 334	ME 25/31 STL	black / white	50	4 x 100
10 407 370	ME 25/41 STL	green / black	47	4 x 100
10 407 372	ME 25/41 STL	green / black	50	4 x 100
10 409 470	ME 25/41 ST	green / gridded	47	1 x 100
10 409 472	ME 25/41 ST	green / gridded	50	1 x 100

STL - for use with our Membrane-Butler
ST - single sterile packed

Membrane filtration

Product Navigation

Send mail to webmaster with questions or comments about this web site. Copyright © 2005 Gentaur BVBA Last modified: feb-07

Send mail to webmaster with questions or comments about this web site.
Copyright © 2005 Gentaur BVBA
Last modified: feb-07