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 All Categories    Whatman Mini-UniPrep™ G2 Syringeless Filters
All Categories > Filtration Products > Whatman Mini-UniPrep™ G2 Syringeless Filters  

Whatman Mini-UniPrep™ G2 Syringeless Filters

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The Whatman Mini-UniPrep™ G2 Syringeless filter simplifies UHPLC/HPLC sample preparation over the traditional syringe filter method. The Whatman Mini-UniPrep G2 is an all-in-one intergrated filter that replaces the syringe, syringe filter, glass vial, cap, and septum. After the filtration step, Whatman Mini-UniPrep G2 can be placed directly into the autosampler in readiness for injecting sample into the UHPLC/HPLC instrument.

The Whatman Mini-UniPrep G2 includes an integral borosilicate glass vial housed within the plunger and a borosilicate glass chamber for holding the unfiltered liquid. During the filtration step, the plunger is compressed into the glass chamber containing the unfiltered liquid. As the plunger travels downward, liquid flows through the filtration membrane to the top of the plunger and drops into the glass collection vial housed within the plunger. Therefore, the sample only contacts plastic for a very short period of time, i.e. only while the plunger is being compressed through the unfiltered liquid. Once compressed, the Whatman Mini-UniPrep G2 is ready to be loaded directly on to the autosampler.

Whatman Mini-UniPrep G2 comes in a number of configurations including slit septa for those autosamplers and robotic systems that require a slit septa.  It is also available in amber for light-sensitive samples.  Amber Whatman Mini-UniPrep meets the requirements of the U.S. Pharmacopeia (USP) and European Pharmacopeia (EP) for light transmission.

Features of the Whatman Mini-UniPrep G2

  • Consists of an intergral borosilicate glass autosampler vial, plunger with attached filter membrane, and septum/cap.
  • Filters samples three times faster compared to the traditional syringe filter method.
  • Glass construction minimizes the risk of leachables contaminating the sample.
  • Designed to be loaded directly into the autosampler.
  • Includes visual indication that the sample has been filtered.
  • Minimizes instrument downtime due to unfiltered samples.
  • Wide range of membranes with 0.2 and 0.45µm pore sizes to meet specific sample filtration requirements.

Technical Specifications - 


Once compressed, equivalent in size to 12x32mm vial

Materials of Construction

Chamber: Borosilicate Glass
Plunger Outer Housing: Polypropylene
Plunger Inner Storage Vial: Borosilicate Glass
Filter Media: As specified
Septa: Silicone with PTFE Liner
Cap: Polypropylene

Filtering Capacity

Chamber (Unfiltered Sample): 500µL
Inner Storage Vial (Filtered Sample): 330µL
Recommended Minimum Filtering Volume:
220µL placed in the Chamber to obtain 50µL in Inner Storage Vial

Nominal Force Needed to Compress

Approx. 25 lbs. (11.3 kg)

Autosampler Compatibility

Any autosampler that accommodates standard 12x32mm profile vials (Needle height of the autosampler may need adjusting)

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Nylon Filtration Media

Sample type: Aqueous/organic samples in 3 to 10 pH range

PVDF (Polyvinylidene Difluoride) Filtration Media

Sample type: Aqueous/organic solvents-low non-specific protein binding media.

PTFE (Polytetrafluoroethylene) Filtration Media

Sample type: Chemically aggressive solutions.

PP (Polypropylene) Filtration Media

Sample type: General filtration media/solvent based samples
Whatman Filtration Mini-UniPrep G2 Collage

Accessories for Whatman Mini-UniPrep™ G2 Syringeless Filters

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