Microfluidics

A microfluidic system is an instrument that moves and analyses fluids in channels narrower than a human hair, handling nanolitre to microlitre volumes through etched or moulded channel networks. It separates, sizes and quantifies biological molecules such as DNA, RNA and proteins.

Microfluidics refers to the control of very small fluid volumes through microchannels, where the tight channel geometry governs how samples flow and separate. In a laboratory it is applied to sizing and quantitation of nucleic acids and proteins using minute amounts of sample.

Sample is driven through a chip or cartridge containing etched or moulded channels, where an applied voltage or pressure separates molecules by size or charge as they pass a detection point. A laser or LED excites the sample and a detector reads the signal to produce sizing and concentration data.

The listings that specify a type include nucleic acid analysers, protein analysers, microfluidic electrophoresis systems, DNA fragment analysers, protein analysis systems and broader molecular biology instruments. The first two groups appear most among the typed listings.

They size and quantify DNA and RNA for genomics and pre-sequencing quality control, read fragment length distributions for genotyping and library preparation, and separate proteins by molecular weight to assess purity. The common thread is work where sample is scarce and a slab gel wastes too much of it.

Start with the sample you measure: a nucleic acid analyser sizes DNA and RNA, a protein analyser separates by molecular weight, and the two diverge completely in their chips, reagent kits and software. Fix the measurement first, then confirm the consumable line the instrument needs is still manufactured and sold.

A used unit is sold in its existing condition, while a refurbished unit has been checked and brought back toward working specification before listing. On both, verify the optics, fluidics and the consumable line rather than relying on the label, and ask for a recent run on a known standard.

Prices in the catalogue range from EUR 15 to EUR 232.440, with an average around EUR 14.926. The low end covers loose chips and accessories while the high end covers complete bench analysers, so read the figure against the instrument class before treating it as a budget.

Agilent, Bio-Rad, PerkinElmer, Precision Nanosystems and 10x Genomics account for most of the microfluidic listings in the catalogue. Units from a widely listed maker are easier to compare and their chips circulate more freely, while the less common names fill specific niches such as single-cell partitioning.

A warranty is often possible and is arranged in consultation for the specific listing. Terms are not set centrally, so check the individual listing and raise the question with the supplier before purchase.

Parts and chips for the widely listed makers circulate more freely than those for niche names, which lowers the risk of a unit stranding on a discontinued consumable. Parts can be sourced via Questpair when a listing needs them.

On a used unit the optics and the fluidics are what age: the laser or LED excitation source, the detector, and the pumps and valves that must hold pressure without leaking. A system whose source still reaches rated output and whose fluidics hold pressure can run for years, so verify those before buying rather than counting on age alone.

Used and refurbished microfluidic systems are listed at lower prices than new, which is the practical draw at a capability level that lists in six figures new. Weigh the consumable commitment into the figure, and because warranty is arranged per listing, compare the specific unit rather than assuming any difference beyond price.

The Questpair catalogue holds 253 microfluidic listings from 18 verified suppliers and distributors across 9 countries. New, used and refurbished systems are listed together, so you can compare condition and price in one place.

Lead time and shipping depend on the individual supplier and the unit's location, which varies across the 9 countries represented in the catalogue. Check the specific listing, and for details Questpair specialists respond within one hour.

Calibration is checked against a known standard such as a sizing ladder or a protein reference, which shows the instrument resolving a sample rather than simply powering on. Where a buyer wants calibration or part sourcing, Questpair handles parts and arranges warranty in consultation for the specific listing.

Nucleic acid analysers and protein analysers dominate the typed listings. Genomics and pre-sequencing quality control groups reach for nucleic acid analysers and DNA fragment analysers, while proteomics and protein purification groups reach for protein analysers and protein analysis systems; microfluidic electrophoresis systems carry out the capillary and chip-based separation underneath both.

Agilent, Bio-Rad, PerkinElmer, Precision Nanosystems and 10x Genomics account for most of what is listed. For a buyer that concentration means several units of the same series often sit on the marketplace at once, so a price has context, the parts and chips circulate more freely, and the gap a used listing offers against a known new price is visible rather than guessed.

The band runs from EUR 15 to EUR 232.440. At the bottom sit bare accessories, loose chips and consumables, while the top holds complete bench analysers with their optics, fluidics and detection intact; the consumable each unit needs factors into the real cost as much as the sticker price does.