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SpectraPor® Float-A-Lyzer Dialysis Device

Ready-to-use dialysis devices are all made with proprietary Biotech Grade CE dialysis tubing, pre-assembled with volume specific lengths of membrane tubing and designed to maximize convenience, ease-of-use and sample recovery.

SpectraPor® Float-A-Lyzer® Dialysis Device

The SpectraPor® Float-A-Lyzer® Dialysis Device is a unique and leak-proof, ready-to-use device designed for easy and convenient dialysis of small sample volumes from 1 – 10 ml. The device is made with high purity Biotech Grade Cellulose Ester (CE) membrane in 9 MWCOs from 0.1-1,000 kD. Screw cap lid and included pipette allow for easy loading, in-process testing and sample retrieval without the risk of needle punctures.

Biotech CE membrane exhibits a fair chemical compatibility and tolerates pH 2-9 and temp 4-37 °C. Exposure to most organic solvents is not recommended and should be confirmed on the Repligen Chemical Compatibility table.


  • 3 ready-to-use volume sizes (1 ml, 5 ml & 10 ml)
  • 9 Concise MWCO’s for better selectivity & separations
  • High purity Biotech Cellulose Ester (CE) membrane
  • Leak-proof and color-coded screw cap
  • Complete with floatation ring and pipette included
Unique design

Tubular membrane allows for maximum surface area and minimum volume uptake & dilution. Float ring ensures buoyancy and vertical orientation

easy to use

Screw-on cap and pipette provides easy and safe sample loading and in-process testing with no dangerous needles

total sample recovery

Cylindrical shape provides open access for 95-98% sample volume recovery

Broad MWCO Range

9 MWCOs from 0.1 - 1,000 kD for all dialysis applications from small peptides to large nanoparticles

High Purity

Achieve 98% sample purity with Biotech CE membrane, no heavy metal and sulfides.

Featured Application

Drug Dissolution: Controlled release for dose determination

USP Apparatus 2 and 4 compatible

How it works

Three easy steps

  1. Rinse with water

  2. Load sample

  3. Dialyze

Typical Dialysis Applications for Float-A-Lyzer® Dialysis Devices

  • Drug dissolution and controlled release studies
  • Salt, urea, surfactant and cesiuam removal
  • HPLC sample preparation
  • pH change, buffer exchange and final formulation
  • Purification of Protein, DNA, plasmids, macromolecules, nanoparticles and liposomes
  • Biopolymer purification and removal of monomers
  • Enzyme activity and ligand binding studies
  • DNA and Protein electroelution

Product Specifications

3 Volume Sizes 1 ml 5 ml 10 ml
Working volume 0.8 ml - 1.3 ml 4.0 ml - 5.5 ml 8.0 ml - 11.0 ml
Total length 5 cm 10 cm 16 cm
Membrane diameter 10 mm 10 mm 10 mm
Top piece diameter 23 mm 23 mm 23 mm
Flotation ring 38 mm 38 mm 38 mm
9 MWCOs Color Code
0.1 - 0.5 kD Green
0.5 - 1 kD Orange
3.5 - 5 kD Black
8 - 10 kD Yellow
20 kD Red
50 kD Violet
100 kD Blue
300 kD Amber
1000 kD Pink
Membrane type Biotech grade Cellulose Ester (CE)
Screw-on cap Open and close for in-process sampling
  Color-coded for MWCO
Silicon O-ring Leak proof and resealable
Flotation ring Device body inserts through center to maintain buoyancy in buffer
Top/Bottom piece Polycarbonate
Potting Polyurethane
Sample loading Disposable pipette for 5 and 10 ml (included)
Pipette tip for 1 ml (not included)
Package/Quantity Dry with glycerol, 12/package