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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

NameExcitation (nm)Emission (nm)Extinction coefficient (cm -1 M -1)Quantum yieldCorrection Factor (260 nm)Correction Factor (280 nm)Correction Factor (656 nm)
iFluor® 405–dextran conjugate (average MW = ~70K)4034273700010.9110.480.77-
iFluor® 647–dextran conjugate (average MW = ~10K)65667025000010.2510.030.030.0793
iFluor® 647–dextran conjugate (average MW = ~150K)65667025000010.2510.030.030.0793
iFluor® 647–dextran conjugate (average MW = ~20K)65667025000010.2510.030.030.0793

References

View all 50 references: Citation Explorer
The Blue Light-Responsive Lateral Pathway of the Retinohypothalamic Tract Promotes Endocannabinoid-Driven Modulation of Orexin Neurons.
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
Journal: Journal of neurochemistry (2025): e70137
Synthesis and optimization of fluoxetine-loaded polymeric nanoparticles for dual therapeutic applications in cancer and depression.
Authors: Shoaib, Muhammad and Arif, Hira and Awan, Asia Naz and Khan, Moona Mehboob and Batool, Sehrish and Ahmed, Shakil
Journal: Daru : journal of Faculty of Pharmacy, Tehran University of Medical Sciences (2025): 18
Persisting blood-brain barrier disruption following cisplatin treatment in a mouse model of chemotherapy-associated cognitive impairment.
Authors: Patai, Roland and Csik, Boglarka and Nyul-Toth, Adam and Gulej, Rafal and Vali Kordestan, Kiana and Chandragiri, Siva Sai and Shanmugarama, Santny and Tarantini, Stefano and Mukli, Peter and Ungvari, Anna and Yabluchanskiy, Andriy and Ungvari, Zoltan and Csiszar, Anna
Journal: GeroScience (2025): 3835-3847
Corneal epithelial cells upregulate macropinocytosis to engulf metabolically active axonal mitochondria released by injured axons.
Authors: Pal-Ghosh, Sonali and Datta-Majumdar, Himani and Datta, Soneha and Dimri, Shelly and Hally, Jordan and Wehmeyer, Hugo and Chen, Zhong and Watsky, Mitchell and Ma, Jian-Xing and Liang, Wentao and Stepp, Mary Ann
Journal: The ocular surface (2025): 173-188
Genetic tools for imaging microcirculation via plasma labeling.
Authors: Wang, Xiaowen and Vittani, Marta and Lee, Ashley Bomin and Knak, Philip Gade and Hirase, Hajime
Journal: Anatomical science international (2025)
Page updated on July 2, 2025

Ordering information

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Catalog Number21720
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Physical properties

Solvent

Water

Spectral properties

Correction Factor (260 nm)

0.03

Correction Factor (280 nm)

0.03

Correction Factor (656 nm)

0.0793

Extinction coefficient (cm -1 M -1)

2500001

Excitation (nm)

656

Emission (nm)

670

Quantum yield

0.251

Storage, safety and handling

H-phraseH303, H313, H333
Hazard symbolXN
Intended useResearch Use Only (RUO)
R-phraseR20, R21, R22

Storage

Freeze (< -15 °C); Minimize light exposure