Used Molecular Devices SpectraMax® Plus 384 Microplate Reader

The Molecular Devices SpectraMax® Plus 384 Microplate Reader​ is a dedicated high-performance UV-Vis absorbance reader designed to bridge the gap between traditional cuvette spectrophotometers and high-throughput microplate detection. It combines the full-spectrum flexibility of a research-grade spectrophotometer with the speed and efficiency of a 384-well plate reader, making it a workhorse for quantitative analysis in academic, pharmaceutical, and biotechnology laboratories.

Core Technology & Optical Performance

At the heart of the SpectraMax Plus 384 is a sophisticated high-resolution monochromator system​ (2 nm bandwidth) that eliminates the need for fixed-wavelength filters. It utilizes a high-energy xenon flash lamp and a multi-channel detection system that mimics a dual-beam spectrophotometer, providing exceptional baseline stability and low stray light (<0.05% at 230 nm). This allows for precise measurements across a broad wavelength range of 190–1000 nm, tunable in 1 nm increments, which is critical for challenging UV applications like nucleic acid quantification and low-wavelength protein assays (e.g., at 205 nm or 280 nm).

A key innovation is the PathCheck® Sensor technology, which automatically corrects microplate absorbance readings to a standard 1 cm pathlength. This feature normalizes data to cuvette-equivalent values, allowing researchers to directly apply traditional spectrophotometric calculations (e.g., for DNA concentration) without manual adjustments, regardless of well volume or temperature.

Key Features & Workflow Integration

• Dual-Function Design: The instrument features a dedicated 1 cm cuvette port​ alongside the microplate drawer. This enables direct comparison of samples between cuvettes and plates, or quick single-sample checks without wasting a whole plate, maintaining the familiar workflow of a traditional lab spectrophotometer.

• High-Speed Throughput: Despite its research-grade optics, the reader is optimized for speed. In "Speed Read" mode, it can read a 96-well plate in approximately 5 seconds and a 384-well plate in about 16 seconds, significantly accelerating ELISA and kinetic assay workflows.

• Automation Ready: The reader is fully compatible with Molecular Devices' StakMax® Microplate Stacker​ and third-party robotic arms. This allows for unattended operation in automated screening environments, with seamless integration managed by the powerful SoftMax® Pro Software.

Technical Specifications

Applications

The SpectraMax Plus 384 is predominantly used for DNA, RNA, and protein quantification​ (A260/A280, Bradford, BCA), ELISA/EIA development, enzyme kinetics​ (Km, Ki), bacterial growth curves​ (OD600), and cell viability/cytotoxicity assays. Its robust design and cuvette-compatible nature make it particularly valuable in core facilities and labs that require a single instrument to handle both routine spectrophotometry and high-density plate reading.

Note: Specifications may vary with optional accessories like the SpectraDrop module for 2 µL micro-volume measurements. Always verify the specific configuration when evaluating a used instrument.