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Cy5 aldehyde

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Physical properties
Molecular weight945.04
Spectral properties
Correction Factor (260 nm)0.02
Correction Factor (280 nm)0.03
Correction Factor (482 nm)0.009
Correction Factor (565 nm)0.09
Extinction coefficient (cm -1 M -1)2500001
Excitation (nm)651
Emission (nm)670
Quantum yield0.271, 0.42
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: Cyanines
Molecular weight
Correction Factor (260 nm)
Correction Factor (280 nm)
Correction Factor (482 nm)
Correction Factor (565 nm)
Extinction coefficient (cm -1 M -1)
Excitation (nm)
Emission (nm)
Quantum yield
0.271, 0.42
Cy5 aldehyde is a reactive red fluorescent dye that can react with an amine, hydrazine or hydroxylamine. 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 Cy5 dye can be easily detected by a common fluorescence instrument under Cy5 channel.


Common stock solution preparation

Table 1. Volume of DMSO needed to reconstitute specific mass of Cy5 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 mM105.816 µL529.078 µL1.058 mL5.291 mL10.582 mL
5 mM21.163 µL105.816 µL211.631 µL1.058 mL2.116 mL
10 mM10.582 µL52.908 µL105.816 µL529.078 µL1.058 mL

Molarity calculator

Enter any two values (mass, volume, concentration) to calculate the third.

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Spectral properties

Correction Factor (260 nm)0.02
Correction Factor (280 nm)0.03
Correction Factor (482 nm)0.009
Correction Factor (565 nm)0.09
Extinction coefficient (cm -1 M -1)2500001
Excitation (nm)651
Emission (nm)670
Quantum yield0.271, 0.42

Product Family

NameExcitation (nm)Emission (nm)Extinction coefficient (cm -1 M -1)Quantum yieldCorrection Factor (260 nm)Correction Factor (280 nm)Correction Factor (482 nm)Correction Factor (565 nm)
Cy5 tertrazine [Cy5 tertrazine]65167025000010.271, 0.420.020.030.0090.09
Cy5 phosphoramidite65167025000010.271, 0.420.020.030.0090.09
Cy5 tyramide65167025000010.271, 0.420.020.030.0090.09
Cy5 tetrazine65167025000010.271, 0.420.020.030.0090.09
DBCO-Cy565167025000010.271, 0.420.020.030.0090.09
Fluorescein aldehyde [5-FAM aldehyde]49351783000-0.320.178--
Rhodamine aldehyde [5-TAMRA aldehyde]55257890000-0.320.178--
Cy3 aldehyde55556915000010.1510.070.073--
XFD488 aldehyde *Same Structure to Alexa Fluor™ 488 aldehyde*499520710000.9210.300.11--



View all 13 references: Citation Explorer
pH responsible and fluorescent Cy5.5-PEG-g-A-HA/CDDP complex nanoparticles: synthesis, characterization, and application for targeted drug delivery.
Authors: Cheng, Cui and Meng, Yabin and Zhang, Zhihong and Li, Ya and Liu, Chun and Zhang, Qiqing
Journal: Journal of materials science. Materials in medicine (2019): 58
[Microanalysis of Acetaldehyde Dehydrogenase 2 Genotype Based on SNaPShot-FCA].
Authors: Zeng, Shu-Shu and Gao, Xiu-Feng and Zhang, You and Feng, Chuan-Rui and Luo, Ya-Xiong and Wu, Xiao-Ting and Li, Yong-Sheng
Journal: Sichuan da xue xue bao. Yi xue ban = Journal of Sichuan University. Medical science edition (2019): 737-742
Tumoral Acidic pH-Responsive cis-Diaminodichloroplatinum-Incorporated Cy5.5-PEG- g-A-HA Nanoparticles for Targeting Delivery of CDDP against Cervical Cancer.
Authors: Cheng, Cui and Meng, Yabin and Zhang, Zhihong and Li, Ya and Zhang, Qiqing
Journal: ACS applied materials & interfaces (2018): 26882-26892
Sensitive Detection of Polynucleotide Kinase Activity by Paper-Based Fluorescence Assay with λ Exonuclease Assistance.
Authors: Zhang, Hua and Zhao, Zhen and Lei, Zhen and Wang, Zhenxin
Journal: Analytical chemistry (2016): 11358-11363
Sensitive detection of histamine using fluorescently labeled oxido-reductases.
Authors: Gustiananda, Marsia and Andreoni, Alessio and Tabares, Leandro C and Tepper, Armand W J W and Fortunato, Luca and Aartsma, Thijs J and Canters, Gerard W
Journal: Biosensors & bioelectronics (2012): 419-25
Protein thiol oxidation in murine airway epithelial cells in response to naphthalene or diethyl maleate.
Authors: Spiess, Page C and Morin, Dexter and Williams, Chase R and Buckpitt, Alan R
Journal: American journal of respiratory cell and molecular biology (2010): 316-25
Identification of S-nitrosated mitochondrial proteins by S-nitrosothiol difference in gel electrophoresis (SNO-DIGE): implications for the regulation of mitochondrial function by reversible S-nitrosation.
Authors: Chouchani, Edward T and Hurd, Thomas R and Nadtochiy, Sergiy M and Brookes, Paul S and Fearnley, Ian M and Lilley, Kathryn S and Smith, Robin A J and Murphy, Michael P
Journal: The Biochemical journal (2010): 49-59
An efficient strategy for sequencing-by-synthesis.
Authors: Gao, Li and Lu, Hua and Xu, Lijian and Lu, Zuhong
Journal: Journal of nanoscience and nanotechnology (2010): 2988-93
Chemical derivatization of compact disc polycarbonate surfaces for SNPs detection.
Authors: Bañuls, María-José and García-Piñón, Francisco and Puchades, Rosa and Maquieira, Angel
Journal: Bioconjugate chemistry (2008): 665-72
Single nucleotide polymorphism detection in aldehyde dehydrogenase 2 (ALDH2) gene using bacterial magnetic particles based on dissociation curve analysis.
Authors: Maruyama, Kohei and Takeyama, Haruko and Nemoto, Etsuo and Tanaka, Tsuyoshi and Yoda, Kiyoshi and Matsunaga, Tadashi
Journal: Biotechnology and bioengineering (2004): 687-94