HPLC equipment

Buying guide

The column decides the separation, but the detector decides what you can see, and on the second-hand market the detector is where a buyer should start. A UV or diode-array detector covers most routine work; a fluorescence, refractive-index or evaporative light-scattering detector answers a narrower question, and a mass-selective detector is a different purchase altogether. Match the detector to the compounds first, because a pump and an autosampler can be paired with almost anything, whereas a detector that cannot see your analyte makes the rest of the chromatography system useless. From there the pump matters: a binary or quaternary gradient pump opens up method development, while an isocratic pump suits a fixed, validated assay and costs less.

Condition is the real work on a used HPLC module, and it rewards questions a datasheet will not answer. A pump that has run for years may need new seals and a piston check; an autosampler's needle, rotor seal and sample loop wear with every injection; a lamp in a UV detector has a finite burn time and may be near its end. Ask for the instrument's run hours, the date of the last preventive maintenance, and whether the seller has a recent pressure trace or a baseline from the detector. A module that powers up tells you little; one that holds pressure and gives a flat baseline tells you it will separate a sample.

The price band here is wide, running from EUR 1 to EUR 150.647. That spread is the difference between a single accessory or a spare lamp at the bottom and a complete, modern UHPLC stack with a mass detector at the top, with the average listing at EUR 5.918. What this means for a buyer on a budget is that a working isocratic or gradient system can be assembled module by module well below the cost of a new one, since refurbished and used units listed for sale are more affordable than new. The brands that dominate the listings, Agilent, Waters, Thermo Scientific, Agilent Technologies, Shimadzu, are the ones whose parts, columns and service documentation are easiest to find, which keeps a second-hand purchase supportable for years. A warranty is often possible and is arranged in consultation for the specific listing, so confirm the terms on the listing itself rather than assuming them.

Types of HPLC equipment

Which HPLC component types are listed?

Among the listings that specify a type, the catalogue splits into whole systems and the individual modules that make them up. A high-performance liquid chromatography (HPLC) system is the complete, integrated instrument, bought when a laboratory needs a working setup out of the box. The modules are sold separately because each wears and is replaced on its own schedule. An HPLC pump delivers the mobile phase at constant high pressure, and the choice between isocratic and gradient models shapes which methods the instrument can run. An autosampler automates injection, reaching for it is routine wherever a lab runs long unattended sequences. An HPLC detector and the closely related analytical detector register the separated compounds as they leave the column, with the detection principle, UV, fluorescence, refractive index, deciding what the system can measure. Liquid chromatography accessories, columns, fittings, loops and lamps, are the consumable and semi-consumable parts that keep an existing instrument running.

The chromatography these instruments perform is central to the life sciences. In molecular biology and biochemistry, HPLC and the related UHPLC drive protein purification, peptide mapping and the separation of nucleic acids, and ion-exchange and size-exclusion columns are everyday tools in those workflows. Reversed-phase HPLC for small-molecule analysis anchors much of molecular diagnostics and pharmaceutical quality control, while HPLC coupled to a mass detector, the LC-MS configuration, is a workhorse of proteomics and metabolomics. Preparative liquid chromatography systems scale the same separation up for biomanufacturing and bioprocessing, isolating a purified product from a complex mixture. An autosampler feeding a high-throughput immunoassay or a therapeutic-drug-monitoring assay is also used for clinical sample analysis at volume.

The brands behind the HPLC listings

The names that recur in the listings are Agilent, Waters, Thermo Scientific, Agilent Technologies, Shimadzu. For a buyer this concentration is useful rather than limiting. These are the makers whose columns, seals, lamps and rotor seals are stocked by third parties, whose method files and service manuals circulate widely, and whose model numbers are well enough known that two used units can be compared on specification rather than guesswork. A pump or detector from one of these lines is easier to keep running for a decade than an orphaned instrument from a maker that has left the market. Parts can be sourced via Questpair where a module needs them.

What a used HPLC system costs here

The condition mix is heavily weighted: 98 percent of the listings are used. Prices span from EUR 1 to EUR 150.647, a range that reflects everything from a single lamp or fitting at the low end to a complete UHPLC-MS stack at the high end, with the average at EUR 5.918. Used and refurbished units are listed below the price of new equipment, which is what makes building a system from separate modules practical.