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iFluor® 488 tyramide
For many immunohistochemical (IHC) applications, traditional enzymatic amplification procedures are sufficient for achieving adequate antigen detection. However, several factors limit their sensitivity and utility. Tyramide signal amplification (TSA) has proven to be a particularly versatile and powerful enzyme amplification technique with improved assay sensitivity. TSA is based on the ability of HRP, in the presence of low concentrations of hydrogen peroxide, to convert labeled tyramine-containing substrate into an oxidized, highly reactive free radical that can covalently bind to tyrosine residues at or near the HRP. To achieve maximal IHC detection, tyramine is prelabeled with a fluorophore. The signal amplification conferred by the turnover of multiple tyramide substrates per peroxidase label results in the ability to detect low-abundance targets with ultrasensitive precision and reduces the amount of antibodies and hybridization probes needed. In IHC applications, this method can also enhance sensitivity in cases where the primary antibody dilution needs to be increased to reduce nonspecific background signals or overcome weak immunolabeling due to suboptimal fixation procedures or low levels of target expression. The iFluor® 488 tyramide contains the bright iFluor® 488 that can be readily detected with the standard FITC filter set. iFluor® dyes have higher florescence intensity, increased photostability, and enhanced water solubility, resulting in fluorescence signals with significantly higher precision and sensitivity. iFluor® 488 is an excellent replacement for Alexa Fluor® 488 tyramide (Alexa Fluor® is the trademark of ThermoFisher), FITC tyramide, or other comparable fluorescent tyramide conjugates.
Immunofluorescent image of paraffin-embedded human lung carcinoma labeled with  EpCAM Rabbit mAb followed with HRP-labeled goat anti-rabbit IgG (H+L) (Cat#16793) . The signal was developed with iFluor® 488 tyramide or Alexa Fluor™ 488 Tyramide Reagent (Green). Cells were also counterstained with DAPI (Blue).
Immunofluorescent image of paraffin-embedded human lung carcinoma labeled with  EpCAM Rabbit mAb followed with HRP-labeled goat anti-rabbit IgG (H+L) (Cat#16793) . The signal was developed with iFluor® 488 tyramide or Alexa Fluor™ 488 Tyramide Reagent (Green). Cells were also counterstained with DAPI (Blue).
protocol
Protocol
COA
CatalogSize
Price
Quantity
45100200 slides
Price
 
Physical properties
Molecular weight531.47
SolventDMSO
Spectral properties
Correction factor (260 nm)0.21
Correction factor (280 nm)0.11
Extinction coefficient (cm -1 M -1)
75000
1
Excitation (nm)491
Emission (nm)516
Quantum yield
0.9
1
Storage, safety and handling
H-phraseH303, H313, H333
Hazard symbolXN
Intended useResearch Use Only (RUO)
R-phraseR20, R21, R22
StorageFreeze (< -15 °C); Minimize light exposure
UNSPSC12352200
Instrument settings
Fluorescence microscope
ExcitationFITC filter set
EmissionFITC filter set
Recommended plateBlack wall/clear bottom
Documents
Protocol
Safety Data Sheet (Catalog 45100)
Safety Data Sheet (Catalog 11060)
Certificate of Analysis
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Page updated on October 27, 2025