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Fluorescent rhodol derivatives: versatile, photostable labels and tracers
J E Whitaker1, R P Haugland, D Ryan
1Molecular Probes, Inc., Eugene, Oregon 97402.
Analytical Biochemistry
|December 1, 1992
Summary
Chemically reactive rhodol dyes were developed with tunable optical properties and improved photostability. These novel fluorescent probes offer enhanced performance for various bioimaging applications compared to existing dyes.
Area of Science:
- Organic Chemistry
- Biochemistry
- Analytical Chemistry
Background:
- Fluorescent dyes are essential tools in biological research for imaging and detection.
- Existing dyes like fluorescein and tetramethylrhodamine (TMR) have limitations in photostability, pH sensitivity, and conjugation efficiency.
- There is a need for novel fluorescent probes with improved optical properties and chemical reactivity.
Purpose of the Study:
- To synthesize and characterize a series of chemically reactive, fluorescent rhodol derivatives.
- To evaluate the optical properties, photostability, and pH sensitivity of these new rhodol dyes.
- To compare the performance of rhodol derivatives with established fluorescent probes like fluorescein and TMR.
Main Methods:
- Synthesis of rhodol derivatives incorporating various reactive functional groups (e.g., activated esters, haloacetamides, acrylamides).
- Spectroscopic characterization including absorption and emission maxima, extinction coefficients, and fluorescence lifetimes.
- Evaluation of photostability, pH sensitivity, solubility, and performance upon conjugation to proteins.
Main Results:
- Rhodol dyes exhibited tunable absorption (490-550 nm) and emission (520-580 nm) maxima with high extinction coefficients (>50,000 M-1 cm-1).
- Most derivatives showed fluorescence lifetimes of 3-4 ns and were compatible with standard laser lines (488, 514 nm) and filter sets.
- Rhodol dyes demonstrated superior photostability and lower pH sensitivity compared to fluorescein derivatives, and higher quantum yields and solubility than TMR analogs.
Conclusions:
- Chemically reactive rhodol derivatives offer a versatile platform for developing advanced fluorescent probes.
- These novel rhodol dyes provide enhanced photostability, pH insensitivity, and improved performance in aqueous solutions and protein conjugates.
- The rhodol dyes are suitable for multicolor fluorescence microscopy, flow cytometry, and DNA sequencing, offering advantages over existing fluorophores.