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Best practice mass photometry: a guide to optimal single-molecule mass measurement
Jiří Kratochvíl1,2, Raman van Wee1,2,3, Jan Christoph Thiele1,2
1The Kavli Institute for Nanoscience Discovery, University of Oxford, Oxford, UK.
Nature Protocols
|October 14, 2025
Summary
Mass photometry (MP) is a powerful technique for analyzing biomolecular interactions. This study details key factors and simple steps to optimize MP measurements for improved mass resolution and detection limits.
Area of Science:
- Biophysics
- Biochemistry
- Analytical Chemistry
Background:
- Mass photometry (MP) is a key technique for studying biomolecular interactions.
- Accurate measurement of optical contrast from individual molecules at interfaces is crucial for MP.
- Current MP performance can be limited by factors beyond photon shot noise.
Purpose of the Study:
- To identify key factors influencing mass photometry (MP) performance.
- To provide practical steps for optimizing MP measurements.
- To enhance mass resolution, quantitative detection limits, and reproducibility in MP.
Main Methods:
- Focus on critical parameters affecting MP performance.
- Development of simple, actionable steps for assay optimization.
- Analysis of factors influencing mass resolution, detection limits, and reproducibility.
Main Results:
- Identified key factors impacting MP performance.
- Demonstrated simple optimization steps to improve MP measurements.
- Achieved enhanced mass resolution, detection limits, and reproducibility.
Conclusions:
- Optimizing MP assay parameters significantly enhances measurement performance.
- Simple procedural adjustments can lead to superior mass-resolved quantification of biomolecular mixtures.
- MP remains a fast, simple, and powerful technique for biomolecular analysis with improved performance.
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