Microvolume Microplate Reader with Low-Volume Plates

What is the Microvolume Microplate Reader with Low-Volume Plates?

A microvolume microplate reader uses specialized low-volume plates or spot plates to measure absorbance of 2 microliter samples, often from 230 to 750 nanometers. It is chosen for high-throughput nucleic acid and protein quantification when sample is scarce and many samples must be measured.

Overview

These readers measure samples in microvolume plates that hold 2 microliters per well as a droplet or capillary-formed column, with a fixed short path length of roughly 0.5 millimeters or less. Up to 16 or 64 samples are read in one plate, and the typical 260 nanometer nucleic acid range spans about 2 to 3,000 nanograms per microliter for double-stranded DNA. Because the path is short, concentrated samples can be measured without dilution, and A260/A280 and A260/A230 ratios quantify purity. A xenon lamp with a monochromator or diode array provides spectra from 230 to 750 nanometers. Some instruments also accept standard 96-well plates for cuvette-equivalent reading. They are unsuitable for kinetic work, and plates should be wiped or discarded after use to avoid carryover between samples.

How does it work?

A microplate reader illuminates each well and measures the light that returns. In absorbance mode, a lamp such as a xenon flash source passes light through a filter or monochromator and the well, and a photodiode measures transmitted intensity. Absorbance follows the Beer–Lambert law, so concentration is proportional to optical density. In fluorescence mode, excitation light is directed at the sample and a photomultiplier tube or photodiode measures emission at a longer wavelength through a separate filter path, from the top or bottom of the plate. Luminescence mode uses no excitation and counts photons from chemical or biological light emission. Time-resolved fluorescence adds a delay after excitation to remove short-lived background. Precise plate carriers, path length correction, shaking and temperature control complete the system.

What are the key features?

• Reads 2 microliter samples without dilution using a short fixed path length
• Up to 16 or 64 samples per microvolume plate
• Full UV-Vis spectrum from 230 to 750 nanometers per sample
• Automatic A260/A280 and A260/A230 purity ratio reporting
• Accepts standard 96-well plates for cuvette-equivalent reading on some models
• Measurement time of under 10 seconds for a 16-sample plate

What are the technical specifications?

A typical microvolume microplate reader with low-volume plates configuration offers sample volume of 2 µL, wavelength range of 230–750 nm, path length of 0.5 mm or less (fixed, plate defined), dsDNA measurement range of 2–3,000 ng/µL, protein (BSA) range of 0.1–100 mg/mL and absorbance accuracy of ±2% at 0.5–1.5 A. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Microvolume Microplate Reader with Low-Volume Plates is used in DNA and RNA quantification for sequencing libraries, protein A280 measurement, purity checks before PCR and cloning, labeled nucleic acid dye-to-base ratio and bacterial OD600 on standard plates. Across the wider Microplate Readers class, laboratories also deploy it for ELISA quantification, cell viability and cytotoxicity assays and enzyme kinetics.

Which standards and certifications apply?

Relevant standards and methods include ANSI/SLAS 1-2004 to 4-2004, IEC 61010-1, IEC 61010-2-081, IEC 61326-1, ISO 13485 (IVD use) and 21 CFR Part 11. Certification candidates for this model are CE, ISO 9001 manufacturing and RoHS; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Place the reader on a vibration-free bench away from direct sunlight and strong electromagnetic sources, and allow the lamp and optics to warm up as specified. Verify absorbance accuracy and linearity with certified filters or standard solutions at installation and at least annually, and check fluorescence sensitivity with a fluorescein dilution series. Keep the plate carrier and optics clean, and replace flash lamps according to flash count. Use plates matched to the mode, for example clear for absorbance, black for fluorescence and white for luminescence. Apply software access control and data integrity features where regulated.

How do I select the right Microvolume Microplate Reader with Low-Volume Plates?

Select this variant for routine quantification of scarce nucleic acid or protein samples at high sample counts. A fluorometric method is better for very dilute samples or when contaminants interfere. In an RFQ specify sample volume, samples per plate, wavelength range, path length, and whether standard 96-well reading is also required.

How does it compare with other Microplate Readers variants?

Select a reader by the detection modes you need today and in the next few years. Absorbance-only readers suit routine ELISA and protein assays. Multimode readers add fluorescence, luminescence, time-resolved fluorescence or fluorescence polarization for cell-based and screening assays. Compare sensitivity (for example fluorescein detection limit), dynamic range, and wavelength flexibility between filters and monochromators. Check supported plate formats up to 384 or 1536 wells, read speed per plate, temperature control and shaking for kinetic work, and gas control for live-cell reading. For regulated laboratories, verify software with user management and audit trails. Consider injectors for flash luminescence, imaging readers for cell counting, and whether a stacker interface is needed for automation.