HOOK™ Dye Labeling Kit (FITC)

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SKU: 786-080-XX Category:
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FITC (fluorescein isothiocyanate) is a commonly used fluorescent label for proteins, as it contains the groups required for conjugating to amino, sulfhydryl, imidazoyl, tyrosyl or carbonyl groups of proteins. FITC has a molecular weight of 389, and excitation and emission wavelengths of 494nm and 520nm, respectively, therefore emitting green visible light. This kit utilizes SpinOUT™ desalting columns, for the rapid removal of unconjugated dye.

The FITC labeling reagent is also available in our single use OneQuant™ format.

This kit is an improvement on Cat. # 786-059 as it offers greater free dye removal and complete coupling in less time.



  • Synonym:  Fluorescein-5-Isothiocyanate
  • CAS Number: 3326-32-7
  • Linear Formula: C21H11NO5S
  • Molecular Weight: 389.4
  • Dye preweighed and supplied in single use OneQuant™ vials (Also available separately).
  • Suitable for most proteins.
  • Utilizes  SpinOUT™ desalting columns, for the rapid removal of unconjugated dye



  • Labeling of a green fluorescent dye to proteins and peptides.
  • Suitable for antibody labeling.



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