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Microplate reader: A multifunctional tool in biomedical research
2025-03-12
A microplate reader is a laboratory instrument widely used in biomedical research, R&D, and clinical diagnostics. It detects optical signals (such as absorbance, fluorescence, and chemiluminescence) in microplates to perform quantitative and qualitative analysis of various biomolecules (such as proteins, nucleic acids, and cells). The high throughput, high sensitivity, and automation features of microplate readers make them an indispensable tool in modern life science research.
Working Principle of a Microplate Reader
The core function of a microplate reader is based on optical detection technology. Its working principle mainly includes the following steps:
Light Source Emission: The built-in light source (such as a xenon lamp or LED) of the microplate reader emits light of a specific wavelength.
Light Path Transmission: Light passes through a filter or monochromator to select a specific wavelength and irradiates the sample in the microplate.
Signal Detection: Molecules in the sample absorb or emit light signals, which are captured by a detector (such as a photomultiplier tube or CCD).
Data Analysis: The instrument converts the light signal into an electrical signal, and the software processes the data to output quantitative results.
According to different detection modes, microplate readers can be divided into the following categories:
Absorbance Detection: Used in ELISA, protein concentration determination, etc.
Fluorescence Detection: Used in fluorescence labeling experiments, cell viability assays, etc.
Chemiluminescence Detection: Used for high-sensitivity detection, such as reporter gene experiments.
Time-Resolved Fluorescence (TRF): Used to reduce background interference and improve the signal-to-noise ratio.
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