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An extended model for open-ended fluorosensor probes
1Department of Chemical Reaction Engineering, Chalmers University of Technology, Göteborg, Sweden.
Biotechnology Progress
|March 1, 1993
Summary
Accurate NADH measurements require a geometric factor in models, accounting for light emission distribution and excitation beam divergence. This improves quantitative analysis beyond simple assumptions.
Area of Science:
- Analytical Chemistry
- Biochemistry
- Spectroscopy
Background:
- Accurate quantification of nicotinamide adenine dinucleotide (NADH) is crucial in biochemical assays.
- Traditional fluorometric methods often rely on simplified models for light emission and propagation.
Purpose of the Study:
- To develop a more accurate model for quantitative fluorometry of NADH solutions.
- To investigate the impact of geometric factors and light emission patterns on measurement accuracy.
Main Methods:
- Fluorometric measurements of pure NADH solutions across a range of concentrations (8-800 microM) and path lengths (0-140 mm).
- Utilized an open-ended fluorosensor.
- Developed and tested a mathematical model incorporating a geometric factor.
Main Results:
- A geometric factor is essential for quantitatively explaining fluorosensor measurements of NADH.
- The assumption of completely directed emitted light is inaccurate.
- A model assuming uniform light distribution provided a better fit, but required accounting for excitation beam divergence.
Conclusions:
- Quantitative fluorometry of NADH necessitates a refined model that includes geometric considerations.
- Uniform light emission and excitation beam divergence are critical parameters for accurate NADH quantification.