Electrophoresis

Buying guide

Because this spans the whole bench rather than one device, the price range is far wider than any single category shows. Across these listings prices run from EUR 1 to EUR 533.942. The figure at the bottom is a consumable: a single buffer sachet, a membrane, a reagent vial, the kind of item a lab reorders without a second thought. The figure at the top belongs to the instrument end, a molecular imager or a capillary system, where the detection optics and the enclosed hardware carry the cost. A tank and power supply sit well below that, which is why a basic separation setup can be assembled for a fraction of what the imaging step alone costs.

Condition is the other axis. 94 percent of the listings are used. For a tank, a power supply, or a transfer cell that is often a straightforward buy, since the mechanics are simple and a working unit works. For an imager or a capillary instrument the detection hardware is what matters, so a buyer weighs the saving against the listing's stated state and age. Used and refurbished units are listed below new prices, and where that trade-off has to be judged it is judged on the individual listing. A warranty is often possible and is arranged in consultation for the specific listing, so the terms on the imaging instrument that holds most of the budget are worth settling before the purchase rather than after.

Types of Electrophoresis

Electrophoresis is the subject here, and the apparatus it leans on falls into a few groups: tanks and power supplies for the separation, blotting and detection gear where proteins are involved, molecular imagers to record the result, and the consumables and reagents that every run consumes. The work itself is not one machine but a sequence, and the sections below walk it in the order a bench actually runs it.

Running the separation

The core step is the separation, and it needs two pieces that have to match. A tank or chamber holds the gel and the buffer, and a power supply drives a constant voltage or current through it. The pairing matters more than either piece alone: a supply rated for a small vertical mini-gel will not hold a steady field across a large horizontal submarine tank, and a run that sags in voltage halfway through smears the bands it was meant to resolve. Among the listings that specify a type, both vertical and horizontal formats appear, and the power supplies range from simple fixed-output units to programmable models that ramp and hold.

Capillary systems sit apart from this. Instead of a slab gel, the separation runs inside a narrow fused-silica capillary, with detection built into the instrument rather than a separate imaging step. They are their own class of apparatus and are listed as such, so a lab choosing between slab and capillary is choosing between two different benches, not two sizes of the same one.

What changes when proteins are involved?

A nucleic-acid run can often end at the gel, read directly under a transilluminator. A protein run usually does not. The proteins are transferred out of the gel onto a membrane, then probed with antibodies to find the one target among many, which is the western blotting step. This adds equipment the DNA bench never touches: a transfer cell, and the antibodies and reagents that make a single band visible.

This is where two steps constrain each other. The transfer has to move protein off the gel cleanly before any detection can work, so a weak or uneven transfer limits what the best imager can later show. The categories behind this step, western blotting gear and antibodies and reagents, are carried here alongside the separation equipment, because the two halves of a protein workflow are bought for the same bench.

Recording the result

A separation that no one can read has produced nothing, so the last step is imaging. Molecular imagers and imaging systems capture the gel or the blot, whether that is fluorescence, chemiluminescence from a western, or a stained DNA gel. This is the step that turns a physical band into a measurable signal, and the detection method the imager supports has to match the label the run used: a chemiluminescent blot and a fluorescent stain do not read on the same hardware.

What keeps a run going day to day?

Beyond the instruments, the work consumes a steady stream of consumables and reagents, and these are the categories a lab reorders rather than buys once. Buffers, precast or hand-poured gels, membranes, and the general laboratory supplies a bench runs through all sit here. They are listed because the work cannot run without them, not because they define it, so a lab stocking up treats this part of the catalogue differently from the instrument side.