Protein purification

Membrane: polyethersulphone. Vivaspin 20ml centrifugal concentrators have been developed to offer increased volume flexibility and performance. Vivaspin 20 handles up to 20ml in swing bucket centrifuges and 14ml in 25° fixed angle rotors accepting 50ml centrifuge tubes. Featuring twin vertical membranes for unparalleled filtration speeds the Vivaspin 20 can achieve 100x plus concentrations. Remaining volume is easy to read off the printed scale on the side of the concentrator and the modified dead stop pocket further simplifies direct pipette recovery of the final concentrate.

Membrane: polyethersulphone. Compatible with swing-out and fixed-angle rotors. The vertical, built-in membrane guarantees minimal membrane fouling and provides rapid sample concentration. Low protein adsorption gives minimal sample loss.

Membrane: polyethersulphone. This 2 ml volume unit combines the rapidity of the classic Vivaspin products with reduced internal surface and membrane areas for superior recoveries from very dilute solutions. With a choice of suitable membranes (PES, CTA, Hydrosart) Vivaspin 2 provides the highest flexibility for process optimisation. Vivaspin 2 guarantees maximum sample recovery either by reverse centrifuging into the concentrate recovery cap or by directly pipetting the concentrate from the deadstop pocket built into the bottom of the concentrator.

Vivaspin^® Filtrate is a ready to use unit for small volume centrifugal ultrafiltration to separate proteins from low molecular weight substances in biological samples.

Typical applications include:

• Drug binding studies
• Determination of metabolites in serum
• Protein removal from blood samples
• Cleaning of liposomes (virus removal)

Membrane: polyethersulphone. Vivaspin 6ml concentrators have been developed to offer increased volume flexibility and performance. Vivaspin 6 can process an impressive 6ml in either swing-out buckets or fixed angle rotors accepting standard 15 ml conical bottom test tubes. The Vivaspin 6 features twin vertical membranes for unparalleled filtration speeds and 100x plus concentrations.

Vivaspin™ ultrafiltration spin columns for minimal handling and reduced sample loss. Specially designed for rapid, non-denaturing concentration and desalting of proteins and other biological samples. Vertical polyethersulfone (PES) membrane minimizes membrane clogging to ensure high flow rates.

Features & Benefits:

• Dead-stop technology: samples are not concentrated to dryness and allows direct concentrate recovery
• pH compatibility from pH 1 to 9
• Polycarbonate tube design for minimal protein adsorption
• Suitable for sample volumes from 100 µl to 20 ml with a molecular weight cutoff value of Mr 3000 to 100 000

Membrane: cellulose triacetate

Solutions of any macromolecules, simple and efficient, desalt and concentrate. Suitable for any centrifuge holding 1.5 ml tubes.

Features & Benefits:

• Even with diluted solutions the recovery is more than 95%.
• Reverse spin to maximize recovery even in the smallest sample
• Storage of filtrate or concentrated sample, very easy in standard microcentrifuge tubes
• concentration factor up to 100 x

Thin channel, crossflow filter units with 50cm² / 200cm² filter areas for capacities between 100ml / 500ml and 5L. This system provides high crossflow rates at minimum pumping pressure and does not require additional fittings for scale-up. VivaFlow 50 is easy to operate with a flow restrictor and, optionally, a pressure indicator. Modular construction with luer connections allows interlocking of units in series for easy scale-up. Recovery rates are maximised due to optimised recirculation volume and by use of low adsorption materials. Disposable.
For greater volumes, VivaFlow 200 is available with a filter area of 200cm² and includes pressure indicator, flow restrictor, filtrate tubing and connectors.
Membrane: polyethersulphone

Standard and Weighted Spectra/Por Closures provide a leak-proof seal for dialysis tubing while aiding in sample buoyancy and vertical orientation. They are available in 23, 35, 55, 75 and 90 mm sealing widths and a variety of colors for easy sample identification. Closures are autoclavable.