iFluor® 647–dextran conjugate (average MW = ~70K)
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: ~70,000 Da dextran provides minimal cellular uptake and extended extracellular retention, ideal for exclusion-based studies.
- Application Areas: Optimized for vascular permeability assays, paracellular transport studies, and extracellular matrix diffusion analyses in both in vitro and in vivo models.
- 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 ~70,000 Da) is a high molecular weight, water-soluble fluorescent probe designed for advanced studies of extracellular transport and vascular dynamics. The 70 kDa dextran polymer is covalently labeled with iFluor® 647, a far-red-emitting fluorophore with excitation and emission maxima at approximately 656 nm and 670 nm. The increased hydrodynamic size of the 70 kDa dextran significantly limits cellular internalization, allowing for prolonged extracellular residence and reduced endocytic uptake. These properties make the conjugate particularly suitable for quantitative analysis of vascular permeability, paracellular transport, and interstitial diffusion in both in vitro and in vivo models.
iFluor® 647 offers a high fluorescence quantum yield and superior photostability, providing a consistent, low-background signal in complex biological environments. Its spectral profile is closely aligned with that of Alexa Fluor® 647 and Cy5, enabling compatibility with 633 nm and 640 nm laser excitation on standard flow cytometry and fluorescence imaging platforms. Supplied as a lyophilized powder, the conjugate is readily reconstituted in aqueous buffers for immediate use in fluorescence-based assays requiring high molecular weight, extracellular fluorescent tracers.
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 = ~70K) | 403 | 427 | 370001 | 0.911 | 0.48 | 0.77 | - |
iFluor® 647–dextran conjugate (average MW = ~10K) | 656 | 670 | 2500001 | 0.251 | 0.03 | 0.03 | 0.0793 |
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 |
References
Authors: Forte, Nicola and Imperatore, Roberta and Marfella, Brenda and Nicois, Alessandro and Verde, Roberta and Palomba, Letizia and Di Marzo, Vincenzo and Cristino, Luigia
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