Direct Detect Provides Spot and Check Results

Merck Millipore, the Life Science division of Merck KGaA of Darmstadt, Germany, launched the Direct Detect™ system for rapid, simplified protein quantitation. Exploiting the company’s membrane expertise it enables IR measurement of amide bonds in protein chains, an intrinsic component of every protein, without relying on amino acid composition, dye-binding properties, or redox potential. “In addition to its analytical powers, the Direct Detect™ system provides a groundbreaking departure from traditional sample prep requirements typical of biomolecular quantitation. After samples are spotted on assay cards, they can be stored in ambient conditions without appreciable change in readout,” describes John Sweeney, Head of Life Science Business Field, Merck Millipore. “Another important advantage over conventional assays is that the Direct Detect™ calibration standard curve requires generation once, which provides additional time savings and ease of use.”

The system employs a hydrophilic polytetrafluoroethylene (PTFE) membrane designed to be transparent in most of the infrared spectral region and enables application of biomolecule solutions directly onto the membrane.

Because the system relies on IR-based detection of biomolecules, users can obtain accurate and reproducible protein quantitation in presence of reducing agents and detergents. As a result, the Direct Detect™ system can measure protein concentrations from 0.2mg/mL to 5mg/mL within seconds, without any bio- or immunochemical staining, directly from samples, including buffered solutions. The Direct Detect™ system can also be used to provide information on non-protein sample components, such as lipids and nucleic acids.