Sample Preparation

Download the Protein Sample Preparation Handbook


Sample preparation is a key procedure in sample analysis.  Frequently, the component of interest is present in levels too low for detection or the presence of interfering matrix elements can mask the analysis of the component of interest. Sample preparation can concentrate the component to adequate levels for measurement and remove excess contaminants to yield clean, informative samples. G-Biosciences offers a variety of products for sample preparation.

Dialysis is a popular technique used for the exchange of buffer medium across semi-permeable membranes. Dialysis devices are available in many configurations for research applications. We offer innovative dialysis devices and accessories for processing small samples. Tube-O-Array is available for the dialysis of up to 12 samples at one time.

Many research applications require concentration of dilute protein solutions. Protein solutions may be concentrated by precipitation, chromatographic capture and elution, or by lyophilization. G-Biosciences offers a selection of protein concentration systems suitable for concentrating proteins for running gels, raising antibodies, protein purification, protein assays and other applications.  Proteins concentrated with these kits are suitable for the majority of downstream applications.

For removing contaminants such as detergents, salts, dyes, and radioisotopes we offer a selection of contamination removal systems. These include our ready-to-use disposable desalting columns and Spin-OUT Columns for removing contamination from protein and nucleic acid samples.

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Centrifuge Tube Adapter

The centrifuge adapter is designed for centrifugation of Medi and Micro Tube-O-DIALYZER™ in a bench top centrifuge. The centrifuge adapter is required for 100% sample recovery by centrifugation ..


Replacement Tube-O-DIALYZER™ floats are also available separately.  Floats for Tube-O-DIALYZER™ Micro and Medi sizes are available.  The floats for Micro are available in two siz..

Micro Dialysis Cups

For dialysis of small sample volumes, equilibrium dialysis, dialysis of single use preparations, and other dialysis applications. The Micro Dialysis Cup has dialysis buffer capacity of 2-15 ml...


Two dialysis tanks specifically designed for use with the Tube-O-DIALYZER™. Two sizes are available that are suitable for Micro and Medi size Tube-O-DIALYZER™. Each tank will accommodate 7 Tube-O-DIAL..

C18 Spin Columns

G-Biosciences C18 Spin Columns are ready-to-use micro centrifuge columns for peptide clean up and concentration.  The columns consist of porous C18 reverse-phase resin that has a particle size if..


The Column-PROTEIN-Concentrate™ kit has been specifically developed for concentration of those proteins that cannot be concentrated either by precipitation or other techniques. The kit is based ..

Concentrator Powder

Concentrator Powder is a high molecular weight polymer which will not migrate across the dialysis membrane.  Simply transfer your dilute protein solution to a dialysis bag or dialysis device, suc..

Concentrator Solution

Concentrator Solution is a novel liquid polymer for the rapid concentration of dilute protein solutions with zero loss, using dialysis.   Simply transfer your dilute protein solution to a d..


Dialysis is the process of separating molecules in solution by the difference in their rates of diffusion through a semi permeable membrane, such as dialysis tubing or Tube-O-DIALYZER™ dialysis ..


EndotoxinOUT™ was designed for the rapid removal of endotoxins and pyrogens (LPS, lipopolysaccharides) from nucleic acid (DNA) samples. EndotoxinOUT™ is an ideal product for the cleanup of..

G-Trap™ GT-100 Desalting Column

G-Trap™ GT-100 Desalting Column is prepacked ready to use column for separation of low molecular weight substances from high molecular weight substances based on size exclusion chromatography.&n..

G-Trap™ GT-1200 Desalting Column

G-Trap™ GT-1200 Desalting Column is prepacked ready to use column for separation of low molecular weight substances from high molecular weight substances based on size exclusion chromatography.&..