Introduction

By working together with key manufacturers of filtration products:- Whatman, Nalgene, Pall Life Sciences, Sartorius, Vivascience and Schleicher & Schuell, VWR International is able to offer you an extensive selection of high quality, competitively priced items from a single source.

These pages pull together just a small number of filtration products. Whether your requirements relate to work in environmental testing, life sciences, molecular biology, microbiology, production processes, analytical chemistry or high throughput screening VWR International has a filtration product that could make your life easier.

Analytical

More Haste, More Speed

How much time do you spend each day filtering samples before analysing them in the autosampler?

The Whatman Mini-UniPrep™ is a syringeless filter and vial all in one - a pre-assembled, disposable unit which removes the need for syringe-coupled filtration devices and separate autosampler vials.

Each Mini-UniPrep is made up of a chamber and a plunger, with a choice of membrane at one end and a pre-attached septum cap on the other. By pressing the plunger through the liquid in the chamber the filtrate is forced up into the reservoir of the plunger. Air escapes through the vent holes until the locking ring is engaged, creating a liquid-tight seal.

Mini-UniPrep is compatible with any autosampler designed to accommodate 12 x 32mm vials. Time spent processing samples is reduced by two thirds, and with the Whatman 'Multi-Compressor' up to six Mini-UniPrep devices can be filtered in one go.

Try it!

To request a trial pack of Mini-UniPreps please contact:
email sales@advtechind.com

Please state whether your sample will be compatible with a 0.45µm polypropylene or the 0.45µm PTFE membrane.

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No Need To Pour-and-Wait

Pall Life Sciences' SolVac magnetic filter holder simplifies the clean-up and degassing of mobile phase solvents and other solutions. SolVac is safe and easy to use. It fits most HPLC bottles and containers and eliminates the need to transfer mobile phase solvent from flasks to reservoir.

SolVac accepts 47mm filters and is chemically compatible with all common HPLC mobile phase solvents.

Buy a SolVac filter holder (code 239/2016/00) for £124.00 and request a pack of 100 47mm, 0.45µm GH Polypro membranes (239/2015/04) for just £30.00 Offer closes 31 December 2001.

To receive a free of charge copy of Pall Life Sciences' latest catalogue, please add product code 75301 1L to your next order.

Save Time With GD/X Analytical

Whatman GD/X syringe filters are the perfect choice for processing viscous and hard-to filter samples. GD/X contains a unique pre-filtration stack of glass microfibre media which filters from 10µm down to 0.7µm. The final stage of filtration is through one of a choice of membranes located below the pre-filtration stack. This arrangement gives exceptionally good loading capacity with fast flow rates, allowing GD/X to filter between three to seven times more sample volume than an unprotected membrane.

For more information, please see page 4-318 of the 2000 Lab Supplies Catalogue.

To request a free sample, please contact:

 Email sales@advtechind.com
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The "Universal" Membrane Filter

GHP Acrodisc syringe filters and GH Polypro membrane disc filters are the versatile products for all your analytical filtration requirements.

• Suitable for both aqueous and aggressive organic solvent-based solutions
• Low protein binding membrane ensuring a high recovery of critical proteinaceous samples
• HPLC certified for low levels of UV-absorbing extractables

25 mm, 0.45 µm, GHP Acrodisc Syringe Filters, 239/2004/02. Pk 50
25 mm, 0.45 µm, GHP Acrodisc Syringe Filters, 239/0004/28. Pk 1000
25 mm, 0.45 µm, GH Polypro Membrane Disc Filters, 239/2015/03. Pk 100

Pure Results with Spartan

Schleicher & Schuell's Spartan syringe filter is an ideal product for HPLC sample preparation. Spartan's low protein binding regenerated cellulose membrane allows it to be used with both organic and aqueous solutions, whilst its insignificant dead volumes (<10µl for 13mm filters, <50µl for 30mm filters) ensures optimal use of small sample volumes. A certificate of analysis for each batch of Spartan is available and, as a useful extra, these syringe filters are supplied in a convenient, reusable storage box!

To receive a Spartan evaluation pack containing four

13mm, 0.2µm 13mm, 0.45µm 30mm, 0.2µm or 30 mm, 0.45µm filters

Please email sales@advtechind.com stating your choice .
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Bioscience Filtration

Big Price Cuts on Bugstopper

The Whatman BugStopper is unique - a reusable closure manufactured from biosafe silicone which provides a sterile vent for culture vessels. This prevents bacteria or viruses entering or leaving the vessel while allowing the free passage of air and gases. BugStopper is available in two sizes and used by simply pushing onto culture flasks from 125ml to 2.5 litres in size. It can be autoclaved in situ, so retaining the integrity of the sample. The silicone wall of the smaller BugStopper can be pierced by a needle allowing samples to be inserted or for gas infusion.

402/0444/02 Diam. 43mm (top), 30mm (base)
402/0444/10 Diam. 62mm (top), 31mm (base- internal cone)

Swap Your Tissue Culture Filter Unit For Nalgene Product

The Nalgene range of filter units includes products with the ultimate tissue culture membrane. Polyethersulphone (PES) is fast and clean with low protein binding, so there is less chance of removing critical protein components from your media. We're so confident that you'll see an improvement with Nalgene filterware that we are offering to replace any other supplier's pack you are currently using for cell or tissue culture media filtration with two packs of an appropriate Nalgene line.

Contact us with email sales@advtechind.com for details.

Maximum 4 packs of Nalgene product per laboratory.

Ultra Good

VWR International is pleased to offer the extremely successful Vivascience range of ultrafiltration products which provide end users with many benefits over similar technologies on the market. These include faster processing times, higher or equivalent recovery of the target protein, ease of use and ultra-competitive prices.

For more information on Vivascience's centrifugal, pressure-fugation, solvent absorption and tangential flow ultrafiltration devices, please email sales@advtechind.com
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Vivaspin 20 - Ultra Fast

Vivaspin 20 is a centrifugal concentrator capable of processing 20 ml samples in swing bucket centrifuges or 14 ml when used in 25° fixed angle rotors.

The product features twin, vertical PES membranes giving unparalleled filtration speeds and 100 x concentrations. Vivaspin 20 can be pressurised up to 5 bar prior to centrifugation for even faster processing. "Pressure-fugation" is particularly suitable for difficult or viscous samples, such as serum, or when using a low process temperature which reduces filtration speed.

The attachment of an accessory diafiltration cup containing buffer solution allows Vivaspin 20 to be used in a single step centrifugal desalting process. As solvent in the sample passes through the membrane it is continuously replaced by fresh buffer solution from the accessory cup to give 98% salt removal.

Other products in Vivascience's range of centrifugal concentrators include:

Vivaspin 500 (100-600 µl samples) Vivaspin 2 (2 ml samples) Vivaspin 6 (6 ml samples) Vivacell 70 (70 ml samples)

Order Details for Vivaspin 20:

Accessories:

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Sartolab Filter Units

The Sartolab 'P20' and 'P20 plus' are ready-to-use pressure filtration units which, when attached to a peristaltic pump, can filter up to 5 litres of media and aqueous solutions.

A 0.2 µm low adsorption cellulose acetate membrane allows fast flow rates. These flow rates are further enhanced in the Sartolab 'P20 plus' unit which contains a supplementary glass fibre pre-filter. Any trapped air bubbles automatically escape through one of the eight PTFE-membrane protected vent ports ensuring that the whole filter surface is utilised during filtration.

Sartolab P20:

Sartolab P20 plus:

Solid Phase Extraction in the Multiwell Format

Whatman has developed an outstanding range of devices for Solid Phase Extraction (SPE) applications in the multiwell format. These 96 well plates are either packed with a choice of media or contain a glass microfibre filter impregnated with C18 silica. An inert membrane support forms an integral part of the reinforced plate body and base plate and allows high flow rates under vacuum or centrifugation. Each well is individually sealed with a macroporous frit on the top of the resin bed.

SPE Bioplates contain Whatman chromatography media that have proven performance characteristics and are optimised for function in the application areas of:

Reverse phase - C18, GFM C18, C8 and C4 Reverse phase - phenyl Ion exchange - strong and weak anion and cation exchangers Polar/normal phase - silica/cyano

The plates are produced from chemically resistant polypropylene and have low binding and leaching characteristics. Each well features a long drip director to enable the filtrate to be accurately dispensed into a collection plate without cross contamination or loss of sample. SPE Bioplates conform to SBS standards and have a standard footprint for use with automated systems.

For further information please email sales@advtechind.com
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Turboblotter

The Nytran SuPerCharge TurboBlotter from Schleicher & Schuell is a completely reusable blotting device capable of generating high resolution transfers of DNA and RNA in only one hour. Easy to assemble and compatible with a range of gel sizes up to 20 x 25cm, the unique TurboBlotter is very economical in its use of paper and buffer.

Each TurboBlotter kit comprises the transfer device itself plus five sheets of Nytran nylon membrane and appropriate blotting papers and wicks.

For further information please email sales@advtechind.com

Vivacell 250

The Vivacell 250 is a new concept for the rapid, pressurised concentration of biological samples up to 250ml which offers numerous advantages when compared to stirred cells. Set up of the equipment takes a matter of seconds and, for simplicity, the product can be employed free standing on a bench top or in a refrigerator. For the fastest results Vivacell 250 can be used on a laboratory shaker where its gentle vortex action reduces the shear effects often seen with stirred mechanisms.

For more information on Vivascience's centrifugal, pressure-fugation, solvent absorption and tangential flow ultrafiltration devices, please email sales@advtechind.com
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Environmental Analysis

VWR International offers a wide range of products for air, groundwater and hazardous waste analysis.

Whatman - Filters, Glass Fibre

Whatman glass microfibre filters are manufactured from 100% borosilicate glass and are chemically inert and completely binder free. They are widely used in the routine monitoring of water pollution. Also for testing air pollution and the specialised analysis of solid pollutants, microorganisms, oil and acid smokes in air. They are particularly recommended for high efficiency collection of fine particles.

GF/A

A highly efficient general filter. Suitable for testing suspended solids in all types of water and effluent analyses. Also used in the testing of algae and bacterial cultures and in air pollution monitoring. Typical thickness:- 260 µm. Particle retention (liquid):- 1.6 µm.

GF/B

Thicker than GF/A and with a higher wet strength and increased loading capacity. Recommended for concentrated suspensions of small particles and in techniques requiring up to 68.5 mg of water per cm2. Suitable for measuring suspended solids in industrial effluents, especially at high loading. Typical thickness:- 675 µm. Particle retention (liquid):- 1.0 µm.

GF/C

Regularly specified in standard tests for determining suspended solids in water, removal of turbidity and filtration of bacterial cultures. Typical thickness:- 260 µm. Particle retention (liquid):- 1.2 µm.

Ordering Information
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Supplied as packs of 100, except those designated * which are in packs of 25.

Pall Life Sciences - Filters, Glass Fibre, TCLP

Low extractable, binder-free borosilicate glass fibre filters with a 0.7 µm (nominal) pore size designed to meet the requirements of the US EPA SW-846 Method 1311:- Toxicity Characteristics Leaching Procedure (TCLP). Each lot is tested and certified for arsenic, selenium, lead, cadmium, barium, chromium, silver and mercury content to ensure negligible levels of extractable metals.

TCLP Glass Fibre Filters. Pack of 50. Typical Filter Thickness: 380 µm. Pore size: 0.7 µm (nominal).

Pall Life Sciences - Filters, Membrane Disc, GLA-5000 (PVC)

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Pall Life Sciences - Filters, Glass Fibre Discs, Type A/E

Superior grade borosilicate glass fibre filters, without binder, suitable for a variety of applications including testing dissolved and suspended solids in waste water, and the gravimetric analysis of air pollutants. Type A/E filters are characterised by a high flow rate and wet strength and high dirt (solids) holding capacities. Autoclavable.

Pall Life Sciences - Filters, Membrane Disc, GN Metricel® (mixed cellulose esters)

Pall Life Sciences - Filters, Membrane Disc, DM Metricel® (vinyl/acrylic copolymer)

Pall Life Sciences - Filter Cassettes, Air Monitoring, 37 mm

Pall Life Sciences - Filter Holders, Open-face

Holder Construction Material:
25 mm: Acetal resin
37 mm and 47 mm: Aluminium

Effective Filtration Area:
25 mm 3.7 cm2
37 mm 4.9cm2
47 mm 9.6cm2

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General Filtration

Points Mean Prizes with Pall

Pall Life Sciences' new 'Frequent Filter' brochure is now out. Buy Pall Life Sciences filters from VWR International, collect the coupons in the product packaging and exchange them for gifts from the 'Frequent Filter' brochure. Items on offer include tool sets, a polo shirt, fleece jacket, trolley case, radio, portable CD player and, of course, a cuddly Lenny the Lab Rat, plus much more.

To receive a copy of Pall Life Sciences' 2001 'Frequent Filter' brochure please email sales@advtechind.com  

Schleicher & Who?

VWR International has increased its selection of filtration products by adding the Schleicher & Schuell range. So who are this company (and how do you pronounce their name)?

Schleicher & Schuell ("Shly-kur & Shool" or "S&S" if you find it easier!) have their head office and main production site in Germany and have been manufacturing high quality papers for over 400 years. As the German market leader for filter papers Schleicher & Schuell offer a large choice of quality products ensuring an optimal, competitively priced grade is available for your application.

Today their filtration range also covers membrane filters for microfiltration and microbiological analysis, ready-to-use units, blotting membranes and devices plus products for ultrafiltration.

To receive a Schleicher & Schuell catalogue please email  sales@advtechind.com  

Great Value For Money

Don't forget VWR International's own range of great value for money flat and folded filter papers, glass microfibre filters and syringe filters.

See the Filtration section in the 2000 Lab Supplies catalogue for more details.

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Microbiology Filtration

Specially designed for the microbiological testing of beverages, pharmaceuticals, water and other liquids, Sartorius' BioSart 100 is a 100ml sterile disposable monitor with a 47mm diameter membrane and pad.

The unit is placed onto a vacuum manifold and the sample, and then the media, poured into the top of the monitor and filtered through the gridded cellulose nitrate membrane. The lid and base of the Biosart can be used to form a Petri dish for incubation of the membrane after filtration.

White membrane 0.45µm Code 234/2011/00
Green membrane 0.45µm Code 234/2011/01
Grey membrane 0.45µm Code 234/2011/02

Reproducible Collection of Airborne Bacteria, Yeasts & Viruses Microbiology

The Sartorius MD8 airscan is designed to operate outside the test area making it an ideal instrument for the quantitative detection of airborne micro organisms in class A, B and 100 clean rooms and isolators. With a filtration rate of 1m3 of air in less than eight minutes, the MD8 allows isokinetic sampling at normal laminar flow velocities. Sampling times can be adjusted and maintained, ensuring reproducible analyses of the required air volume.

Micro organisms are retained by a gelatine membrane which reduces the risk of bacterial dehydration, so maintaining the viability of fragile samples. The gelatine filter is then placed directly onto an agar culture medium for incubation and colony growth.

For more information, plus details of membranes and other accessories, please look on page 4-323 of our 2000 Lab Supplies Catalogue, email sales@advtechind.com .

Retention rates: (a) Bacillus subtilis niger, 99.9995% (at 0.25m/sec) (b) Phage T1, 99.9% (at 0.3m/sec; 50% relative humidity) (c) Phage T3, 99.94% (at 0.3m/sec; 80% relative humidity)

To order the MD8 airscan please quote product code 234/2012/00.

Magnetic

Pall Life Sciences' 47mm filter funnels feature a unique magnetic seal allowing easy, one handed vacuum filtration of liquids with no leaks! Designed for water testing procedures, the products are sturdy and able to withstand repeated autoclaving.

Order details:- 47mm Magnetic Filter Funnels, manufactured from polyphenylsulphone, with 50ml graduations. For use with 47mm filters. One funnel per pack.

Filter Manifolds

Designed for the vacuum filtration of liquids when testing for microbiological or particulate contamination and suitable for use with both 25 and 47mm filter funnels. Each port has its own individual control valve allowing multiple samples to be processed independently. Choose from the polyurethane model with its small bench footprint (just 27.9cm wide) or the lightweight aluminium manifolds if chemical compatibility is an important issue.

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