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• W2017795945 abstract "Stoichiometry of molecular complexes plays a crucial role in biology. Moreover, for quantitative fluorescence studies, it is often useful to know the number of fluorophores labeled onto the molecules studied. In this work, we propose an approach to determine the number of independent fluorescence emitters on fluorescent molecules based on fluorescence blinking caused by photo-induced triplet state formation, photo-isomerization or charge transfer. The fluorescence blinking is measured under two different excitation regimes, on the same setup, and in one and the same sample. By comparing the fluorescence fluctuations under continuous excitation using Fluorescence Correlation Spectroscopy (FCS), when all the fluorophores are blinking independently of each other, with those occurring under square-pulsed excitation using Transient State (TRAST) spectroscopy, when all fluorophores are blinking in a synchronized manner, the number of fluorophores per molecule can be determined. No calibration sample is needed and the approach is independent of experimental conditions and of the specific environment of the molecules under study.The approach was experimentally validated by labeling double stranded DNA (dsDNA) with different concentrations of the intercalating dye YOYO-1 Iodide. The sample was then measured consecutively by TRAST and FCS and the number of fluorophores per molecule was calculated. The determined numbers were found to agree well with the number of fluorophores per dsDNA, as determined from FCS measurements using additional calibration samples." @default.
• W2017795945 created "2016-06-24" @default.
• W2017795945 creator A5013002722 @default.
• W2017795945 creator A5062075584 @default.
• W2017795945 date "2015-02-26" @default.
• W2017795945 modified "2023-10-03" @default.
• W2017795945 title "Determination of molecular stoichiometry without reference samples by analyzing fluorescence blinking with and without excitation synchronization" @default.
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• W2017795945 doi "https://doi.org/10.1088/2050-6120/3/2/025001" @default.
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