Anotop Plus 25mm Sterile Syringe Filter w/GMF PreFilter, 0.02 um, 50 Pk
Whatman SKU: 6809-4102

Whatman Anotop Aluminum Oxide Syringe Filters, 0.02 µm, 25 mm, 50/Pk - 6809-4102

Whatman's Anotop line separates by physical particle dimension alone, a capability rooted in ceramic media chemistry rather than the organic polymer chemistries used in most other membrane technologies. A syringe filter dispenses filtrate directly into an autosampler vial, without the intermediate collection vessel a bulk vacuum filtration setup typically needs. The alumina membrane presents a high-density honeycomb pore structure and delivers sterile-grade retention at sub-micron pore sizes. The polypropylene housing routes flow to minimize backpressure in service while shipping pre-sterilized and sealed for direct use in aseptic workflows and holds its seal true run after run. Where bench-scale prep must move quickly from one sample to the next, each sample starts as clean as the last without a carry-over risk or a cleaning step between uses.

Membrane Characteristics

• Uniform capillary pore array gives high pore density without lateral crossover
• Low intrinsic autofluorescence limits background signal in fluorescence work
• Membrane surface turns optically transparent once wetted with liquid
• Inorganic ceramic structure resists solvent swelling common to polymer membrane materials
• Absolute pore-size rating holds consistent across every protocol

Housing Characteristics

• Translucent housing wall allows visual confirmation of sample flow during filtration
• Polypropylene density near 0.90 g/cm3 keeps housing weight low relative to denser engineering plastics
• Plasticizer-free polyolefin construction keeps the fluid path clean
• Inert polyolefin wall contributes minimal sample adsorption to the filtrate

Removing particulates from your buffers and mobile phases extends column life and keeps your baselines steady. Reliable particulate removal protects your instruments and your data so column life and baseline stability stay predictable. Standardize your filtration purchases across every method with volume pricing and documentation from the Tisch Scientific team.

For more information about chemical compatibility, please review our Chemical Compatibility Chart.

Bubble Point (psi)

6.9 bar (100 psi)

Connection Type

Luer-Lok/ Luer Slip

Diameter

25mm

Filtration Area

4.91cm²

Material

Anopore

Pack Count

50

Pore Size (µm)

0.02

Prefilter (Yes/No)

No

Sterility

Nonsterile

Volume Throughput (ml)

Up to 100ml

Wettability

Hydrophilic

• Electrolyte Clarification - Removes colloidal particles from electrochemical solutions for reproducible impedance and conductivity measurements.
• Drinking Water Compliance - Concentrates microorganisms from potable water samples for enumeration and regulatory-method pathogen detection testing.
• Drug Nanoparticle QC - Removes oversized aggregates from nanoparticle drug carriers before size and zeta potential analysis for formulation release.
• Nucleic Acid Clarification - Removes particulates from plasmid and oligonucleotide preparations ahead of gel electrophoresis and UV quantitation.
• Quantum Dot Preparation - Removes oversized aggregates from quantum dot suspensions ahead of photoluminescence and fluorescence spectroscopy.
• Gravimetric Solids Testing - Determine particulate mass accurately, using a non-hygroscopic ceramic that resists moisture-driven drift.