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L09319 Fluorescein isothiocyanate, isomer 1, 95%

CAS Number

Stock No. Size Price ($) Quantity Availability
L09319-MF 50mg 29.40
L09319-MD 250mg 84.40
L09319-03 1g 228.00
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Fluorescein isothiocyanate, isomer 1, 95%


Chemical Properties

Formula Weight
Melting point
Storage & Sensitivity
Keep Cold. Moisture Sensitive.
Slightly soluble in DMSO, ethanol, methanol DMF and acetone


Fluorescein isothiocyanate is used as fluorescent labeling reagent for proteins and for rapid identification of pathogens in fluorescent antibody technique. It is also used as a reagent for microsequencing of proteins and peptides (HPLC). On celite it is used for the labeling of fibrinogen.


Incompatible with strong oxidizing agents, strong bases and amines.

Literature References

Reagent for fluorescent labelling of proteins: Anal. Biochem., 20, 178 (1968).

Guilini, C.; Baehr, C.; Schaeffer, E.; Gizzi, P.; Rufi, F.; Haiech, J.; Weiss, E.; Bonnet, D.; Galzi, J. New Fluorescein Precursors for Live Bacteria Detection. Anal. Chem. 2015, 87 (17), 8858-8866.

Chen, Y.; Yang, C.; Li, T.; Zhang, M.; Liu, Y.; Gauthier, M. A.; Zhao, Y.; Wu, C. The Interplay of Disulfide Bonds, α-Helicity, and Hydrophobic Interactions Leads to Ultrahigh Proteolytic Stability of Peptides. Biomacromolecules 2015, 16 (8), 2347-2355.

GHS Hazard and Precautionary Statements

Hazard Statements: H302-H315-H317-H319-H334-H335

Harmful if swallowed. Causes skin irritation. May cause an allergic skin reaction. Causes serious eye irritation. May cause allergy or asthma symptoms or breathing difficulties if inhaled. May cause respiratory irritation.

Precautionary Statements: P261-P264b-P270-P271-P272-P280-P285-P301+P312-P302+P352-P304+P340-P305+P351+P338-P330-P333+P313-P337+P313-P342+P311-P362-P501c

Avoid breathing dust/fume/gas/mist/vapours/spray. Wash face, hands and any exposed skin thoroughly after handling Do not eat, drink or smoke when using this product. Use only outdoors or in a well-ventilated area. Contaminated work clothing should not be allowed out of the workplace. Wear protective gloves/protective clothing/eye protection/face protection. In case of inadequate ventilation wear respiratory protection. IF SWALLOWED: Call a POISON CENTER or doctor/physician if you feel unwell. IF ON SKIN: Wash with plenty of soap and water. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. Rinse mouth. If skin irritation or rash occurs: Get medical advice/attention. If eye irritation persists: If experiencing respiratory symptoms: Call a POISON CENTER or doctor/physician. Take off contaminated clothing and wash before reuse. Dispose of contents/ container to an approved waste disposal plant

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