How do ELISA Systems work?
Enzyme-linked immunosorbent assay uses a plastic microplate whose wells carry a bound capture antibody or antigen. Sample is added, and any target present binds to the solid phase during incubation. After washing, a detection antibody conjugated to an enzyme such as horseradish peroxidase or alkaline phosphatase is added and binds to the captured target. A further wash removes unbound conjugate, then a substrate is added and the enzyme converts it into a coloured product. The reaction is stopped with acid or base and the absorbance is read at a defined wavelength, usually 450 nanometers with a reference wavelength between 600 and 650 nanometers. Absorbance is proportional to the amount of bound analyte, and a calibration curve, often four-parameter logistic, converts readings into concentrations or index values. Strict washing, incubation timing and temperature control determine the reliability of the result.
Which ELISA Systems variants are available?
- Microplate ELISA Reader — A microplate ELISA reader is a photometer that measures absorbance in 96-well or strip plates at selected wavelengths and converts readings into concentrations or index values.
- Automated Microplate Washer for ELISA — An automated microplate washer dispenses and aspirates wash buffer from the wells of a microplate under programmed control, removing unbound material between assay steps.
- Integrated ELISA Reader and Washer System — This system combines the reader and washer in one instrument with shared software, so plate washing and reading are performed in a single sequence with one protocol.
- Automated ELISA Processing System — An automated ELISA processing system performs sample and reagent pipetting, incubation, washing, substrate addition and reading without operator intervention.
- ELISA Workstation with Incubation and Shaking — This workstation combines a microplate incubator with shaking and a reader in a single instrument, so temperature-dependent steps and reading occur under controlled conditions.
How do I choose the right variant?
Define the assays first, then decide how much automation is appropriate. Laboratories running fewer than one hundred wells per day can work with a reader and washer plus manual pipetting, while larger volumes justify an automated processor with plate handling, incubation and reporting. Compare readers by wavelength range, filter set, linearity, and whether they support kinetic and dual-wavelength measurement. For washers, check residual volume, the number of wash cycles programmable, and the manifolds for 96-well and strip formats. For automated systems, check plate capacity, walkaway time, whether the software handles assay protocols centrally, and the traceability of each step with lot numbers and operator identification. Confirm the assay registration status in your market, since ELISA kits are regulated separately from the instruments.
Where are ELISA Systems used?
ELISA Systems are specified in infectious disease serology, allergy specific IgE testing, autoimmune antibody screening and research and clinical trial assays.
Which standards and certifications apply?
Work with ELISA Systems is commonly governed by ISO 15189, CLSI EP05, CLSI I/LA20, CLSI M29, IEC 61010-1 and IEC 61010-2-101. Instrument certifications such as CE marking are confirmed per configuration and never assumed.
What are the key considerations before purchase?
Place the reader and washer on a level bench away from vibration and direct light, and keep the plate carrier and optical window free of dust. Verify performance at installation with a reference dye plate for optical accuracy and with controls for each assay. Daily tasks include checking the washer manifold for blockage, priming the wash lines and running controls at two or three levels. Plates should be read immediately after stopping the reaction, since colour continues to develop and delays bias results, and consistent timing across the plate matters more than absolute speed. Replace tubing and manifold pins when flow becomes uneven, and dispose of wash waste and plates as biohazardous material.
