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Fluorescein aldehyde [5-FAM aldehyde]

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Physical properties
Molecular weight550.52
Spectral properties
Correction Factor (260 nm)0.32
Correction Factor (280 nm)0.178
Extinction coefficient (cm -1 M -1)83000
Excitation (nm)493
Emission (nm)517
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


See also: Fluoresceins
Molecular weight
Correction Factor (260 nm)
Correction Factor (280 nm)
Extinction coefficient (cm -1 M -1)
Excitation (nm)
Emission (nm)
Fluorescein aldehyde is a reactive fluorescent dye that can react with an amine, hydrazine or hydroxylamine. Fluorescein is the most widely used green fluorescent dye. Aldehyde group is reactive toward amines, hydrazide or hydroxylamine groups from pH 5-9. Unlike amine reactive succinimidyl ester group (NHS), aldehyde can react with N-terminal amine groups at acidic pH, a condition sometimes required for certain bioconjugation reactions. Aldehyde reacts with amine group to form an intermediate Schiff bond. Further reduction with hydride will form a stable C-N bond. Reaction between aldehyde and other groups allows site-specific conjugation and labeling of fluorescein dyes to desired position on targeted molecules. Conjugated fluorescein dye can be easily detected by a common fluorescence instrument under FITC channel.


Common stock solution preparation

Table 1. Volume of DMSO needed to reconstitute specific mass of Fluorescein aldehyde [5-FAM aldehyde] to given concentration. Note that volume is only for preparing stock solution. Refer to sample experimental protocol for appropriate experimental/physiological buffers.

0.1 mg0.5 mg1 mg5 mg10 mg
1 mM181.646 µL908.232 µL1.816 mL9.082 mL18.165 mL
5 mM36.329 µL181.646 µL363.293 µL1.816 mL3.633 mL
10 mM18.165 µL90.823 µL181.646 µL908.232 µL1.816 mL

Molarity calculator

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Spectral properties

Correction Factor (260 nm)0.32
Correction Factor (280 nm)0.178
Extinction coefficient (cm -1 M -1)83000
Excitation (nm)493
Emission (nm)517

Product Family

NameExcitation (nm)Emission (nm)Extinction coefficient (cm -1 M -1)Quantum yieldCorrection Factor (260 nm)Correction Factor (280 nm)
Fluorescein biotin4985178000010.79001, 0.9520.320.35
Fluorescein dicaprylate [Fluorescein dioctanoate]4985178000010.79001, 0.9520.320.35
Fluorescein DHPE4985178000010.79001, 0.9520.320.35
Rhodamine aldehyde [5-TAMRA aldehyde]55257890000-0.320.178
Cy3 aldehyde55556915000010.1510.070.073
Cy5 aldehyde65167025000010.271, 0.420.020.03
XFD488 aldehyde *Same Structure to Alexa Fluor™ 488 aldehyde*499520710000.9210.300.11
Fluorescein Tyramide4985178000010.79001, 0.9520.320.35



View all 50 references: Citation Explorer
Preparation and optical parameter characterization of two aldehyde derivative thin films for photonic applications by drop casting method.
Authors: Melavanki, Raveendra and Vaijayanthimala, S and Yallur, Basappa Chanabasappa and Shelar, Vikas M and Singh, Diksha and Sadasivuni, Kishor Kumar and Patil, N R
Journal: Luminescence : the journal of biological and chemical luminescence (2020): 903-912
Establishing sample-preparation protocols for X-ray phase-contrast CT of rodent spinal cords: Aldehyde fixations and osmium impregnation.
Authors: Barbone, Giacomo E and Bravin, Alberto and Mittone, Alberto and Kraiger, Markus J and Hrabě de Angelis, Martin and Bossi, Mario and Ballarini, Elisa and Rodriguez-Menendez, Virginia and Ceresa, Cecilia and Cavaletti, Guido and Coan, Paola
Journal: Journal of neuroscience methods (2020): 108744
Characterization of ascites-derived aldehyde dehydrogenase-positive ovarian cancer stem cells isolated from Leghorn chickens.
Authors: Tiwari, Anupama and Hadley, Jill A and Ramachandran, Ramesh
Journal: Poultry science (2020): 2203-2214
Introduction of an Aldehyde Handle on Nanobodies by Affinity-Guided Labeling.
Authors: Mortensen, Michael R and Skovsgaard, Mikkel B and Märcher, Anders and Andersen, Veronica L and Palmfeldt, Johan and Nielsen, Thorbjørn B and Tørring, Thomas and Laursen, Nick S and Andersen, Kasper R and Kjems, Jørgen and Gothelf, Kurt V
Journal: Bioconjugate chemistry (2020): 1295-1300
2-Formyl-dATP as Substrate for Polymerase Synthesis of Reactive DNA Bearing an Aldehyde Group in the Minor Groove.
Authors: Krömer, Matouš and Brunderová, Mária and Ivancová, Ivana and Poštová Slavětínská, Lenka and Hocek, Michal
Journal: ChemPlusChem (2020): 1164-1170
Isocyanoacetate-Aldehyde Polymerization: A Facile Tool toward Functional Oxazoline-Containing Polymers.
Authors: Cheng, Tianyu and Chen, Yizhao and Ding, Jie and Qin, Anjun and Tang, Ben Zhong
Journal: Macromolecular rapid communications (2020): e2000179
Didactic approach recounting advances and limitations in novel glutathione and cysteine detection (reduced GSH probe) with mixed coumarin, aldehyde, and phenyl-selenium chemistry.
Authors: Lee, Woohyun and Mulay, Sandip V and Shimodaira, Shingo and Abdillah, Ariq and Palma, Jaymee and Kim, Youngsam and Yudhistira, Tesla and Churchill, David G
Journal: Methods in enzymology (2020): 267-289
Bisretinoid phospholipid and vitamin A aldehyde: Shining a light.
Authors: Kim, Hye Jin and Sparrow, Janet R
Journal: Journal of lipid research (2020)
Citral Inhibition of Human Salivary Aldehyde Dehydrogenase.
Authors: Laskar, Amaj Ahmed and Khan, Masood Alam and Ahmad, Sumbul and Hashmi, Amiruddin and Younus, Hina
Journal: Cell biochemistry and biophysics (2020): 31-42
Thiophene-Based Aldehyde Derivatives for Functionalizable and Adhesive Semiconducting Polymers.
Authors: Istif, Emin and Mantione, Daniele and Vallan, Lorenzo and Hadziioannou, Georges and Brochon, Cyril and Cloutet, Eric and Pavlopoulou, Eleni
Journal: ACS applied materials & interfaces (2020): 8695-8703