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Standardized measurements and differential spectroscopy in microplates.
G Geiger1, J Bernhagen, E Wagner
1Laboratory of Biochemistry, Institute for Interfacial Engineering, University of Stuttgart, Fraunhofer IGB, Nobelstrasse 12, Stuttgart, D-70569, Germany.
Analytical Biochemistry
|August 25, 2001
Summary
This study introduces a novel microplate (MP) and lid system designed to overcome common drawbacks in high-throughput (HTP) assays. The innovative design ensures a defined pathlength and reduces evaporation and cross-contamination for accurate spectroscopic analysis.
Area of Science:
- Biotechnology
- Analytical Chemistry
- Spectroscopy
Background:
- Microplates (MPs) are widely used in high-throughput (HTP) processes for various applications including spectroscopic analysis, cell culture, and sample storage.
- Standard MPs suffer from limitations such as ill-defined pathlength, meniscus formation, evaporation, and cross-contamination, which can affect assay accuracy.
- There is a need for improved MP systems that address these drawbacks to enhance reliability and precision in HTP assays.
Purpose of the Study:
- To develop and validate a novel microplate (MP) and lid system to mitigate common drawbacks associated with standard MPs.
- To enable precise and standardized spectrophotometric quantitations in HTP applications.
- To facilitate noninvasive detection of molecular interactions for drug screening and other HTP purposes.
Main Methods:
- Development of a novel microplate (MP) system featuring cup-like lids inserted into MP wells.
- Utilizing the flat bottoms of the cup-like lids to create a planar interface and a defined pathlength.
- Demonstrating the system's capability for differential spectroscopic analysis by investigating the binding of reduced nicotinamide adenine dinucleotide to dihydrolipoamide dehydrogenase.
Main Results:
- The novel MP lid system effectively minimizes drawbacks such as ill-defined pathlength, evaporation, and cross-contamination.
- The system provides a defined pathlength, enabling accurate differential spectroscopic analysis comparable to tandem cuvettes.
- The binding of reduced nicotinamide adenine dinucleotide to dihydrolipoamide dehydrogenase was successfully investigated using the devised MP system.
Conclusions:
- The developed MP lid system offers a low-cost solution for standardized spectrophotometric quantitations in various solvents.
- The system is suitable for routine MP applications and offers advantages for HTP assays and drug screening.
- The noninvasive nature of the method, requiring no labeling or immobilization of analytes, makes it advantageous for detecting molecular interactions.