iFluor® 647–dextran conjugate (average MW = ~10K)
Product key features
- Fluorophore Properties: Conjugated to iFluor® 647, a far-red fluorophore with Ex/Em max = ~656/670 nm; spectrally analogous to Alexa Fluor® 647 and Cy5.
- Dextran Carrier: ~10,000 Da dextran provides efficient endocytic uptake and intracellular diffusion, ideal for fluid-phase tracer applications and vesicular transport studies.
- Application Areas: Optimized for endocytosis tracking, intracellular trafficking, and fluid-phase uptake assays in both live and fixed cell systems.
- Photostability & Brightness: Strong fluorescence intensity, high quantum yield, and resistance to photobleaching for reliable, long-term signal detection.
- Spectral Advantage: Far-red emission minimizes cellular autofluorescence and allows for deep tissue imaging and sensitive detection in complex biological samples.
Product description
iFluor® 647–dextran conjugate (average molecular weight ~10,000 Da) is a hydrophilic fluorescent probe composed of a 10 kDa dextran polymer covalently labeled with iFluor® 647, a far-red-emitting dye with excitation and emission maxima at approximately 656 nm and 670 nm, respectively. The relatively low molecular weight of the dextran backbone supports efficient cellular uptake and intracellular diffusion, making this conjugate particularly suitable for applications such as endocytosis tracking, fluid-phase uptake assays, and vesicular transport studies.
iFluor® 647 exhibits spectral characteristics comparable to Alexa Fluor® 647 and Cy5, offering high fluorescence quantum yield, excellent photostability, and minimal spectral overlap with visible-range fluorophores. Its far-red emission profile provides low background fluorescence and enhanced penetration in tissue imaging, enabling multiplexing with other fluorophores in multi-color flow cytometry and microscopy applications. The conjugate is supplied as a lyophilized powder and reconstitutes readily in aqueous buffers, providing a reliable and high-sensitivity tracer for both live-cell and fixed-sample experiments requiring detection in the far-red spectral range.
Spectrum
Product family
Name | Excitation (nm) | Emission (nm) | Extinction coefficient (cm -1 M -1) | Quantum yield | Correction Factor (260 nm) | Correction Factor (280 nm) | Correction Factor (656 nm) |
iFluor® 405–dextran conjugate (average MW = ~10K) | 403 | 427 | 370001 | 0.911 | 0.48 | 0.77 | - |
iFluor® 647–dextran conjugate (average MW = ~150K) | 656 | 670 | 2500001 | 0.251 | 0.03 | 0.03 | 0.0793 |
iFluor® 647–dextran conjugate (average MW = ~20K) | 656 | 670 | 2500001 | 0.251 | 0.03 | 0.03 | 0.0793 |
iFluor® 647–dextran conjugate (average MW = ~70K) | 656 | 670 | 2500001 | 0.251 | 0.03 | 0.03 | 0.0793 |
References
Authors: Cui, Cedric S and Lerskiatiphanich, Titaya and Li, Xaria X and Giri, Rabina and Liu, Ning and Kumar, Vinod and Whittaker, Andrew K and Han, Felicity Y and Clark, Richard J and Begun, Jakob and Lee, John D and Woodruff, Trent M
Journal: British journal of pharmacology (2025)
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Journal: American journal of physiology. Cell physiology (2025): C404-C413
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Journal: Journal of visualized experiments : JoVE (2024)