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Whatman Mini-UniPrep™ Filter Systems


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Whatman Mini-UniPrep™ Syringeless Filter


The Whatman Mini-UniPrep™ Syringeless Filters provide a faster and easier way to remove particulates from samples being prepared for High-Performance Liquid Chromatography (HPLC)/Ultra High Performance Liquid Chromatography (UHPLC) analysis. In fact, Whatman Mini-UniPrep lets you prepare samples in one third the time required by other methods. Add up the time savings, plus the money saved from cutting multiple consumables out of the sample preparation process and you'll see huge benefits for your laboratory.

Whatman Mini-UniPrep is a preassembled filtration device consisting of a 0.4mL capacity chamber and a plunger. The plunger contains a filtration membrane at one end and preattached cap/septum at the other. The plunger is pressed through the sample in the outer chamber and positive pressure forces the filtrate into the reservoir of the plunger. Air escapes through the vent holes until the locking ring is engaged providing an air-tight seal. Within seconds the Mini-UniPrep can be placed into your autosampler tray for injection into your instrument.

The device can be used either manually or with a compressor unit. The multi-compressor can process up to 6 samples at one time, further improving sample processing time and reducing the risk of hand stress. The Whatman Mini-UniPrep device is designed to fit into any autosampler accommodating 12x32mm vials. Alternatively, the septum can be pierced with a needle and the sample drawn off for manual injection into an analyzer.

Features and benefits

  • All-in-one filtration process allows you to process sample loads in one-third the time.
  • Wide Range of membrane choices from 0.2 and 0.45µm pore sizes to meet specific sample application requirements.
  • Compatible with most major autosamplers.
  • Fewer consumables required, reducing costs by up to 40%.

Applications

  • Routine HPLC/UHPLC analysis
  • Composite assays
  • Content uniformity
  • Protein precipitation
  • Solubility testing
  • Dissolution testing
  • Sample filtration

Amber Whatman Mini-UniPrep Syringeless Filter
Protects samples from UV damage.

Features and benefits

  • Amber colorant prevents photodegradation of light sensitive samples.
  • Same colorant used in pharmaceutical containers designed to meet USP specifications for light resistance.
  • Translucent amber chamber and plunger enable easy visual inspection.

Applications

  • Use with any compound that requires protection from light, such as catecholamines or vitamins.

Slit Septa Whatman Mini-UniPrep Syringeless Filter
For high-throughput automation.

Features and benefits

  • Slit septum cap enables Whatman Mini-UniPrep use with current robotics on HPLC instruments for high throughput automation.
  • Durable yet flexible slit septum cap has been specially designed for instruments with sensitive sampling needs.
  • Sample evaporation is minimal.

Applications

  • Use with standard robotics on HPLC instruments with sensitive needles, allowing for higher throughput.

Technical Specifications - 

Dimensions

Once compressed, equivalent in size to 12x32mm vial

Materials of Construction

Housing and Cap: Polypropylene
Filter Media: As specified
Septa: PTFE coated silicone rubber

Filtering Capacity

400µL

Nominal Force Needed to Compress

Approx. 18 lbs. (8.2 kg)

Maximum operating temperature

50°C (120°F)

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Whatman Mini-UniPrep™ G2 Syringeless Filter


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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 - 

Dimensions

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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