Separates DNA, RNA, or proteins by size using an electric field through agarose or polyacrylamide gels
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Before you buy — what to inspect
Bio-Rad tanks are nearly indestructible. Even 20-year-old Mini-PROTEAN II systems work perfectly. Huge parts availability, every lab tech knows how to use them. Used prices are 60-80% off new.
Checklist: Electrode wires, lid latches, casting stands. Glass plates chip easily—inspect edges closely.
Now part of Thermo Fisher. XCell systems pair with NuPAGE/Bolt precast gels. Excellent for protein work. E-Gel is a proprietary precast system—verify you want that ecosystem before buying.
Checklist: Tension wedge mechanism on XCell must work smoothly. Buffer core gaskets may need replacement ($20).
Professional-grade vertical systems, historically the protein electrophoresis standard before Bio-Rad's dominance. SE600 is a workhorse for large-format 2D gels. Built to last decades.
Checklist: Cooling core functionality, glass plate condition, gasket integrity on multi-gel systems.
Solid American-made systems popular in genomics labs. Less common on secondary market but excellent value when found.
Checklist: Less standardized parts—verify everything is included before purchase.
Budget new alternatives
DNA/RNA horizontal electrophoresis on a budget
Undergraduate teaching labs, low-throughput PCR checks
Small biotech labs wanting new equipment warranty
Startup labs, individual researchers, very low volume work
Gel electrophoresis uses an electric field to migrate charged molecules through a porous gel matrix. DNA and RNA (negatively charged) move toward the positive electrode, with smaller fragments traveling faster and farther than larger ones. For proteins, samples are typically denatured with SDS to give uniform charge-to-mass ratios, allowing separation purely by size. Horizontal systems with agarose gels are standard for DNA/RNA work (50bp to 20kb range), while vertical polyacrylamide systems (PAGE) provide higher resolution needed for proteins and small nucleic acids. The power supply drives the separation—higher voltage means faster runs but risks overheating and band distortion. After electrophoresis, gels are stained (ethidium bromide, SYBR Safe, Coomassie, silver stain) and imaged. Modern labs often pair systems with gel documentation systems for digital capture. Complete systems include the gel tank, casting equipment, combs of various sizes, and a compatible power supply. Understanding your throughput needs (mini-gel vs. large format), resolution requirements, and sample types will determine whether you need a basic $200 setup or a $3,000+ integrated system.
Bio-Rad dominates gel electrophoresis with the widest reagent ecosystem, precast gel availability, and decades of protocol optimization. The Mini-PROTEAN system is cited in more papers than any competitor, ensuring protocol reproducibility. Their tanks are built like tanks—units from the 1990s still run perfectly. Universal compatibility with their Trans-Blot systems for downstream Western blotting makes this the default for protein labs.
What you lose: Cheaper systems have uneven electric fields causing curved 'smiling' bands, thin plastic that warps or cracks, poorly fitting combs that cause lane-to-lane leakage, and no ecosystem of compatible precast gels or accessories. Documentation and protocols are sparse, making troubleshooting harder.
What you keep: Basic separation still works—you'll resolve PCR products and see your ladder. For qualitative yes/no answers about DNA presence, budget systems are adequate. They're fine for teaching basic techniques where perfect data isn't required.
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