HPLC, Liquid Chromatography

Buying guide

The detector decides most HPLC purchases, because it fixes what the system can actually measure. A variable-wavelength or diode-array UV detector covers the majority of pharmaceutical and small-molecule work; a refractive index detector is needed for compounds without a chromophore, such as sugars and polymers; a fluorescence or mass-selective detector is the choice where sensitivity or structural confirmation matters. Settle the detector first, because the pump and the column are specified around it rather than the other way round. A system built for a diode-array detector running a methanol gradient has different pressure and solvent-delivery requirements than an isocratic setup feeding a single-wavelength monitor.

Once the detection chemistry is set, the pump determines the kind of separation available. A binary or quaternary gradient pump handles complex mixtures and method development; an isocratic pump suffices for stable, single-mobile-phase assays and costs considerably less. Check the pressure rating against the columns intended for the work, since sub-two-micron particles push a standard HPLC toward UHPLC pressures.

On a used liquid chromatograph the verification is mechanical rather than theoretical. Confirm the pump seals and check valves hold pressure, ask whether the system has recent performance qualification documentation, and establish the lamp hours on a UV or fluorescence detector, as lamps are consumable and replacement is a real cost. The autosampler needle and injection valve wear with use, so a listing that notes injection-volume accuracy or recent servicing is worth more than one sold without that history. Firmware and software licensing also travel with the instrument, so verify that control software is included and compatible with the detector configuration.

Price spans a wide range here. Prices run from EUR 1 to EUR 236.745, with an average around EUR 8.104. The low end covers individual accessories, columns, and standalone modules; complete systems with modern detectors sit at the upper end. The budget a laboratory sets usually determines whether it buys a complete turnkey instrument or assembles a system from separate modules. Refurbished units listed for sale cost noticeably less than new, which is why 3013 of the listings are used. The brands that dominate the band are Agilent, Waters, Thermo Scientific, Agilent Technologies, Shimadzu, and a used instrument from one of these makers is generally easier to source parts and software for than a less common name.

Types of HPLC, Liquid Chromatography

Which HPLC component types are listed?

Among the listings that specify a type, the catalogue splits between complete instruments and the modules that make them up. A high-performance liquid chromatography (HPLC) system is the assembled instrument, ready to run once a column and method are loaded. An HPLC pump delivers the mobile phase at controlled pressure and flow, and is the module most often replaced or upgraded as separation needs change. An HPLC detector sits at the column outlet and converts the separated bands into a measurable signal, with UV, diode-array, refractive index, and fluorescence variants each suited to different chemistries. An autosampler automates injection, raising throughput for laboratories running long sample queues. A liquid chromatography accessory covers tubing, fittings, lamps, seals, and other consumables that keep a system running. A preparative chromatography column is the wider, higher-capacity column used when the goal is to collect purified material rather than to analyse it.

This equipment does the separation work behind much of molecular biology and the pharmaceutical sciences. HPLC is the standard tool for protein purification and peptide analysis, and reverse-phase and ion-exchange columns are routine in proteomics for resolving complex digests before mass spectrometry. Preparative columns are also used for isolating compounds in natural-product and biomanufacturing workflows, where the fraction collected feeds downstream synthesis or formulation. In molecular diagnostics and clinical analysis, liquid chromatography coupled to a mass detector quantifies drug metabolites and biomarkers, and the same chromatographic separation underpins immunoassay method validation and genomics reagent quality control.

The brands behind the HPLC listings

The HPLC listings are dominated by Agilent, Waters, Thermo Scientific, Agilent Technologies, Shimadzu. For a buyer this concentration is an advantage: these makers have large installed bases, so replacement pumps, detector lamps, seals, and columns remain widely stocked, and a given model is easy to compare against others of the same series on the market. Instruments from these makers also tend to hold established control software ecosystems, which simplifies integration when a module is added to an existing bench. Where a listing carries a less common name, confirm that consumables and software remain obtainable before committing.

What a used HPLC system costs here

The split is heavily toward pre-owned equipment: 3013 of the listings are used against 139 new, or 96 percent used. Prices run from EUR 1 to EUR 236.745. That spread covers everything from a single lamp or fitting at the low end to a complete multi-detector system at the high end, which is why a flat average sits at EUR 8.104 rather than near either boundary. Used and refurbished units are listed below new pricing, and the catalogue holds stock across 20 countries.