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SpectraPor® Micro Float-A-Lyzer®
Ready-to-use Dialysis Device

Micro Float-A-Lyzer® ready-to-use dialysis devices are all made with proprietary Biotech Grade CE dialysis tubing, preassembled with volume specific lengths of membrane tubing and designed to maximize convenience, ease-of-use and sample recovery.

SpectraPor® Micro Float-A-Lyzer Dialysis Device

Designed for ultimate convenience, the Micro Float-A-Lyzer® significantly improves handling and dialysis of microliter volume samples. This ready-to-use dialysis device is constructed with high purity Biotech Grade Cellulose Ester (CE) membrane in 7 concise MWCOs from 0.1-100 kD for better molecular selectivity. The Luer® port and included syringe allow for easy loading, in-process testing and sample retrieval without risking needle punctures.

Biotech CE 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.


  • 2 ready-to-use volume sizes (100-200 µl and 400-500 µl)
  • 7 concise MWCO’s for better separations & selectivity
  • High purity Biotech Cellulose Ester (CE) membrane
  • Included syringe and Luer sample port for easy access (no needles)
  • Self-standing, self-floating and interlocking
unique design

Tubular membrane for max surface area with incorporated air bladder, stand and interlocking pegs

easy to use

Luer cap and syringe allow for easy and safe sample loading and in-process testing, no dangerous needles

total sample recovery

Syringe aspiration of clamp sealed membrane for 90-98% sample recovery

Broad MWCO range

7 MWCO’s from 0.1 - 100 kD for molecular selectivity from small peptides to large nanoparticles

High purity

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

featured application

Drug dissolution: Controlled release for dose determination

USP Apparatus 2 and 4 compatible

How it works

Typical Dialysis Applications for Micro 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

2 Volume Sizes 100-200 µl 400-500 µl
Height 4.4 cm 6.3 cm
Width 4.5 cm 4.5 cm
Thickness 1.9 cm 1.9 cm
Membrane flat width 10 mm 10 mm
Membrane diameter 6.4 mm 6.4 mm
7 MWCOs Color Code
0.1 - 0.5 kD Green
0.5 - 1.0 kD Orange
3.5 - 5 kD Black
8-10 kD Yellow
20 kD Red
50 kD White
100 kD Blue
Membrane type Biotech Grade Cellulose Ester (CE)
PP Luer-Lok cap Open and close for in-process sampling
Color-coded for MWCO
Leak proof and re-sealable
Body piece Seals top/bottom ends of membrane
Buoyant and self-orienting
Potting Polyurethane
Sample loading 1 ml syringe (included)
Packaging 12/package