Large-Format Vertical Electrophoresis System for 2D-PAGE

What is the Large-Format Vertical Electrophoresis System for 2D-PAGE?

A large vertical unit for 20 x 20 cm gels, often with a cooling circuit, designed for the second dimension of two-dimensional electrophoresis and high-resolution separation of complex proteomes. It runs one to twelve gels at a time.

Overview

Two-dimensional electrophoresis first separates proteins by isoelectric point on an immobilised pH gradient strip and then by molecular weight on an SDS-PAGE slab. The second dimension needs large, uniform gels, typically 20 x 20 cm or 24 x 20 cm, with thickness of 1.0 mm, so that thousands of spots can be resolved. Large-format systems therefore include a tank with a buffer-circulating cooling circuit that keeps the temperature within 1 °C, a tall casting cassette with gradient-maker compatibility, and racks that hold six or twelve gels. Runs last 4–16 hours at low constant current to limit heat. Well-made plates, reproducible casting and stable temperature are crucial because spot matching between gels depends on consistent migration. Users include proteomics cores and biomarker discovery groups.

How does it work?

In a vertical system a polyacrylamide gel is cast between two glass plates separated by spacers and mounted so that its top edge dips into an upper buffer chamber and its bottom edge into a lower one. Voltage across the two chambers drives charged molecules down through the gel. Polyacrylamide forms a tighter and more uniform mesh than agarose, and its pore size is set by total acrylamide percentage and crosslinker ratio, so proteins or fragments differing by a few kilodaltons or a single nucleotide can be resolved. In discontinuous SDS-PAGE, a stacking gel concentrates samples into a sharp band before they enter the resolving gel. Key parts include the plates, spacers, combs, clamps, gaskets, buffer chambers and a cooling core or plate that removes Joule heat.

What are the key features?

• Gel size of 20 x 20 cm or larger supports high-resolution second-dimension separation of complex proteomes
• Circulating cooling circuit keeps gel temperature stable within about 1 °C during long runs
• Racks hold six to twelve gels for parallel runs that support reproducible spot matching
• Gradient-maker compatible casting cassettes produce uniform 8–16% or 10–20% gels
• Strip-holder compatible plates allow immobilised pH gradient strips to be placed directly
• Stainless-steel or polycarbonate tank resists buffer and cleaning chemicals during repeated use

What are the technical specifications?

A typical large-format vertical electrophoresis system for 2d-page configuration offers gel size (W x L) of 20 x 20 cm or 24 x 20 cm, gel thickness of 1.0 mm (0.75–1.5 mm options), number of gels per run of 1–12, buffer volume of approx. 6–20 L depending on rack, temperature control of 10–25 °C, approx. ±1 °C with external circulator and maximum voltage of 600 V DC. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Large-Format Vertical Electrophoresis System for 2D-PAGE is used in two-dimensional proteomics, biomarker discovery, differential protein expression studies and comparison of complex protein lysates. Across the wider Vertical Electrophoresis class, laboratories also deploy it for SDS-PAGE protein separation, native PAGE and activity gels and two-dimensional electrophoresis.

Which standards and certifications apply?

Relevant standards and methods include IEC 61010-1, IEC 61326-1, Ph. Eur. 2.2.31, USP <1053> and ISO 17025. Certification candidates for this model are CE, ISO 9001 manufacturing and RoHS; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Assemble plates on a clean, flat surface and check gaskets and spacers for damage before each cast, since leaks ruin gels and contaminate the lower chamber. Acrylamide monomer is neurotoxic, so use gloves and cured gels or pre-cast products where possible. Use fresh APS and TEMED for reproducible polymerisation. Keep buffer chambers filled to the marked level and fit the cooling core for long runs. Clean glass plates with non-abrasive detergent and never use razor blades for separation. Electrical safety follows IEC 61010-1, with interlocked lids and insulated leads. Keep records of gel percentage, buffer batch and run conditions, and verify performance with molecular weight markers.

How do I select the right Large-Format Vertical Electrophoresis System for 2D-PAGE?

Select a large-format system for 2D-PAGE and high-resolution proteome work, where spot reproducibility matters more than speed. It needs a circulator, more buffer and a power supply with enough voltage and low-current control. Specify gel size and number, cooling capacity, IPG strip length and casting capacity.

How does it compare with other Vertical Electrophoresis variants?

Decide the gel format from the application. Mini gels of about 8 x 7 cm are quick and economical for routine protein checks and western blot preparation. Midi and large-format gels give longer separation paths for complex samples, and 20 x 20 cm plates are standard for two-dimensional electrophoresis. Sequencing apparatus with long thin plates suits nucleic acid work at single-base resolution. Consider throughput, whether multiple gels must be run and cast together, and whether cooling is needed for long high-voltage runs. Check gel thickness options from 0.75 to 1.5 mm, comb well counts, compatibility with pre-cast gels, and plate and spacer quality, because chipped glass causes leaks. Match the power supply to voltage and current needs, especially for multi-gel runs.