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AAT Bioquest

XFD430 TCO

Product key features

  • Ex/Em: 432/540 nm
  • Extinction coefficient: 15,000 cm-1M-1
  • Reactive Group: TCO
  • Click Chemistry Conjugation: Provides rapid and copper-free labeling of tetrazine-modified biomolecules
  • pH-Insensitive & High Hydrophilicity: Maintains stable fluorescence across pH 4–10 and minimizes aggregation
  • Large Stokes Shift: Provides clear signal separation and minimizes spectral overlap, enhancing imaging accuracy in sensitive applications

Product description

XFD430, manufactured by AAT Bioquest, is a green-fluorescent dye that is structurally identical to Alexa Fluor™ 430 (ThermoFisher). With excitation and emission maxima at 432 nm and 540 nm, respectively, it is optimally excited by a 405 nm violet laser. Its large Stokes shift reduces spectral overlap with blue-emitting fluorophores, providing a superior signal-to-noise ratio in multiplexed fluorescence assays. XFD430 also exhibits good water solubility and remains pH-insensitive across a wide range (pH 4–10), making it well-suited for generating stable, reproducible fluorescence signals in both microscopy and flow cytometry applications.

XFD430 TCO is particularly useful for labeling tetrazine-modified biomolecules under copper-free conditions. It reacts with tetrazine-functionalized molecules, forming a stable conjugate via a dihydropyrazine moiety. This click reaction is favored over others due to its extremely fast kinetics and higher yields under mild reaction conditions, making it a popular choice for researchers.

Spectrum

Product family

NameExcitation (nm)Emission (nm)Extinction coefficient (cm -1 M -1)Correction Factor (260 nm)Correction Factor (280 nm)
XFD350 TCO343441190000.250.19
XFD405 TCO40142135,0000.230.70
XFD430 acid43254015,000-0.28
XFD430 alkyne43254015,000-0.28
XFD430 amine43254015,000-0.28
XFD430 azide43254015,000-0.28
XFD430 Tetrazine43254015,000-0.28
XFD488 TCO499520730000.30.11
XFD514 TCO518543800000.310.18
XFD532 TCO534553810000.240.09
XFD546 TCO5615721120000.210.12
XFD555 TCO5535681500000.080.08
XFD568 TCO579603913000.450.46
XFD594 TCO590618900000.430.56
XFD610 TCO611629144,0000.430.44
XFD633 TCO632650159,000-0.55
XFD635 TCO633647140,000--
XFD647 TCO6506712390000.000.03
XFD660 TCO6636911320000.000.10
XFD680 TCO6817041840000.000.05
XFD700 TCO6967191920000.000.07
XFD750 TCO7527762400000.000.04
XFD790 TCO782805260,0000.090.08
Show More (14)
Page updated on May 19, 2025

Ordering information

Price
Unit size
Catalog Number70027
Quantity
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Additional ordering information

Telephone1-800-990-8053
Fax1-800-609-2943
Emailsales@aatbio.com
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Purchase orderSend to sales@aatbio.com
ShippingStandard overnight for United States, inquire for international
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Physical properties

Molecular weight

711.79

Solvent

DMSO

Spectral properties

Correction Factor (280 nm)

0.28

Extinction coefficient (cm -1 M -1)

15,000

Excitation (nm)

432

Emission (nm)

540

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
UNSPSC12352200