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P.J. Cobert Associates, Inc.

2302 Weldon Parkway

St. Louis, MO  63146

Toll Free: 1-800-972-4766

Phone: 314-993-2390

Fax: 314-993-2491

cobert@cobertassoc.com

Over 30 Years of chromatography experience!

                                                                             WHATMAN

Filter Plates ______________________________________________________________________________________________

                                                           

UNIFILTER® Filtration Microplates

The patented Whatman UNIFILTER microplates with filter-bottom wells are convenient and ready to use.  Available in 24, 96 and 384 well formats, UNIFILTER microplates offer a choice of filter media to meet exact application requirements.

 

The unique drip director design of Whatman UNIFILTER microplates ensures precise collection of the filtrate to allow for further processing and analysis.  UNIFILTER microplates are available in a range of well volumes from 100µL to 10mL.

 

Features and Benefits

  • No crosstalk.  Patented integral filter design prevents well-to-well cross contamination

  • Economical to use.  Wide range of well volume options ensures efficient use of materials.

  • Better control.  Choice of filter media allows control of the flow rates and retention characteristics.

  • Versatile.  A broad range of filtration media is available including glass fiber, polypropylene, cellulose nitrate, cellulose acetate, nylon and ion exchange cellulose

Filter Media

Flow Rate*

Protein Binding

Hydrophilic

Solvent Resistance

Physical Strength

Thermal Resistance °C

General Comments

Cellulose Nitrate (CN)

4

High

Yes

Poor

Brittle

<125

Highly adsorptive membrane (CN) typically used for DNA/RNA/protein hybridization, also for ELISA and RIA-based assays.

Cellulose Acetate (CA)

3

Low

Yes

Poor

Moderate

<120

Typically used for low protein binding applications, good wet strength.  General purpose microbiological filter.

Polypropylene (PP)

2

Negligible

No

Very Good

Good

<80

Typically used for prefiltration.  Sensitive to gamma sterilization.  Very low extractables, chemically inert.

Polyvinylidene fluoride (PVDF) Hydrophilic**

4

Low

Yes

Good

Good

<135

Low protein binding, good chemical resistance.

Glass Microfiber (GF)

5

Moderate

Yes

Very Good

Poor

High

Wide range available.  Typically used as absorptive or adsorptive wicking media and prefilters.  Excellent particle retention and resistance to clogging.  Used for DNA binding.

 

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              All prices subject to change without notice.

*PRICING NOTE* - P.J. Cobert Associates, Inc. would like to notify you that we have received late notification of price increases

for several manufacturers effective August 1, 2008. We have no control over when manufacturers increase their prices, however

we always do everything possible to keep our pricing as competitive as we can. We apologize for any inconvenience this may cause.

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