08 Labeling Chemistry



Fluorescent Labeling Reagent

  • Several journals addressing the subject of in vivo imaging
  • Monoclonal antibody-ICG conjugates functions as an autoquencher
  • Suitable wavelength for in vivo imaging
  • Product code
    I254  ICG-Sulfo-OSu
  • Chemical name
    2-[7-[1,3-Dihydro-1,1-dimethyl-3-(4-sulfobutyl)-2H-benzo[e]indol-2-ylidene]-1,3,5-heptatrienyl]-1,1-dimethyl-3-[5-(3-sulfosuccinimidyl)oxycarbonylpentyl]-1H-benzo[e]indolium, inner salt, sodium salt
  • MW
Unit size Price Item Code
1 mg $Call for price I254-10

Product Description

ICG is one of the dyes that is used for determining cardiac output, hepatic function, and liver blood flow, as well as for ophthalmic angiography. It has a long excitation wavelength and emission wavelength of about 780 nm and 800 nm, respectively. Because of its long wavelength near the infrared region and low cytotoxicity, ICG is used to label antibodies for in vivo assay. However, fluorescent intensity after conjugation with protein is quite low because of the formation of H-dimer or an energy transfer to antibody molecules after excitation. Dr. Kobayashi and others reported that the use of SDS and betamecraptoethanol with the conjugate increases fluorescent intensity dramatically by diminishing hydrophobic p-p interactions and separation of IgG chains. They applied a treated ICG-conjugated daclizumab (humanized monoclonal antibody) and humanized anti-HER IgG2 monoclonal antibody for in vivo assay to specifically visualized tumors.

Structural Formula

ICG-Sulfo-OSu [code: I254]

Data provision: NIH, K.Sano, H.Kobayashi

Technical info

1. Prepare 6.8 nmol antibody solution with pH 8.5 carbonate buffer or bicine buffer (Good’s buffer).
2. Add 6.8-68 nmol of ICG-Sulfo-OSu/DMSO solution to the antibody solution and incubate at room temperature for 30 minutes.
3. Purify the reaction mixture with a sephadex G50 column.


Open References

1) M. Ogawa, C. A. S. Regino, J. Seidel, M. V. Green, W. Xi, M. Williams, N. Kosaka, P. L. Choyke and H. Kobayashi, "Dual-Modality Molecular Imaging Using Antibodies Labeled with Activatable Fluorescence and a Radionuclide for Specific and Quantitative Targeted Cancer Detection", Bioconjugate Chem., 200920(11), 2177.
2) M. Ogawa, N. Kosaka, P. L. Choyke and H. Kobayashi, "In vivo Molecular Imaging of Cancer with a Quenching Near-Infrared Fluorescent Probe Using Conjuates of Monoclonal Antibodies and Indocyanine Green", Cancer Res.200969(4), 1268.
3) N. Kosaka, M. Ogawa, P. L. Choyke and H. Kobayashi, "Clinical implications of near-infrared fluorescence imaging in cancer", Future Oncology20095(9), 1501.
4) S. Ito, N.Muguruma, S. Hayashi, S. Taoka, T. Bando, K. Inayama, M. Sogabe, T. Okahisa, S. Okamura, H. Shibata, T. Irimura, K. Takesako and S. Shibamura, "Development of Agents for Reinforcement of Fluorescence on Near-infrared Ray Excitation for Immunohistological Staining", Bioorg. Med. Chem.19986, 613.
5) S. Ito, N. Muguruma, Y. Kakehashi, S. Hayashi, S. Okamura, H. Shibata, T. Okahisa, M. Kanamori, S. Shibamura, K. Takesako, M. Nozawa, K. Ishida and M. Shiga, "Development of Fluorescence-Emitting Antibody Labeling Substance by Near-Infrared Ray Excitation", Bioorg. Med. Chem. Lett., 19955, 2689.
6) K. Inayama, S. Ito, N. Muguruma, Y. Kusaka, T. Bando, Y. Tadatsu, M. Tadatsu, K. Ii, S. Shibamura and K. Takesako, "Basic Study of an Agent for Reinforcement of Near-infrared Fluorescence on Tumor Tissue", Digestive and Liver Disease, 200335, 88.
7) S. Ito, N. Muguruma, S. Hayashi, S. Taoka, T. Bando, Y. Kusaka, M. Yano, S. Ichikawa, A. Hiasa, T. Omoya, H. Honda, I. Shimizu, K. Ii, K. Nakamura, K. Takesako, Y. Goto and S. Shibamura, "Visualization of Human Gastric Cancer with a Novel Infrared Fluorescent Labeling Marker of Anti-carcinoembryonic Antigen Antibody in vitro"Dig. Endosc., 200012, 33.
8) S. Taoka, S. Ito, N. Muguruma, S. Hayashi, Y. Kusaka, K. Ii, K. Nakamura, K. Imaizumi, K. Takesako and S. Shibamura, "Reflected Illumination-type Imaging System for the Development of Infrared Fluorescence Endoscopy", Dig. Endosc.,199911(4), 321.
9) S. Ito, N. Muguruma, S. Hayashi, S. Taoka, A. Tsutsui, T. Fukuda, T. Okahisa, Y. Ohkita, H. Matsunaga, I. Shimizu, K. Nakamura, K. Imaizumi, K. Takesako and S. Shibamura,"Development of an Imaging System Using Fluorescent Labeling Substances Excited by Infrared Rays", Dig. Endosc.19979, 278.
10) S. Ito, N. Muguruma, Y. Kusaka, M. Tadatsu, K. Inayama, Y. Musashi, M. Yano, T. Bando, H. Honda, I. Shimizu, K. Ii, K. Takesako, H. Takeuchi and S. Shibamura, "Detection of Human Ganstric Cancer of Resected Specimens Using a Novel Infrared Fluorescent Anti-Human Carcinoembryonic Antigen Antibody with an Infrared Fluorescence Endoscope in Vitro"Endoscopy200133(10), 849.
11) N. Muguruma, S. Ito, T. Bando, S. Taoka, Y. Kusaka, S. Hayashi, S. Ichikawa, Y. Matsunaga, Y. Tada, S. Okamura, K. Ii, K. Imaizumi, K. Nakamura, K. Takesako and S. Shibamura, "Labeled Carcinoembryonic Antigen Antibodies Excitable by Infrared Rays: a Novel Diagnostic Method for Micro Cancers in the Digestive Tract", Internal Medicine199938(7), 537.
12) T. Bando, N. Muguruma, S. Ito, Y. Musashi, K. Inayama, Y. Kusaka, M. Tadatsu, K. Ii, T. Irimura, S. Shibamura and K. Takesako, "Basic Study on a Labeled anti-mucin Antibody Detectable by Infrared-fluorescence Endoscopy", J. Gastroenterol., 200237, 260.
13) N. Muguruma, S. Ito, S. Hayashi, S. Taoka, H. Kakehashi, K. Ii, S. Shibamura and K. Takesako, "Antibodies Labeled with Fluorescence-agent Excitable by Infrared Rays", J. Gastroenterol., 198833, 467.
14) K. Sano, T. Nakajima, K. Miyazaki, Y. Ohuchi, T. Ikegami, P. L. Choyke and H. Kobayashi, "Short PEG-Linkers Improve the Performance of Targeted, Activatable Monoclonal Antibody-Indocyanine Green Optical Imaging Probes", Bioconjugate Chem., 201324, 811.


Handling and storage condition

Appearance: Dark green powder or solid
Purity (HPLC): ≧ 80.0 %
IR spectrum: Authentic
Solubility in Dimethylformamide: To pass test (clear, dark green)
Handling and storage condition
-20°C, Protect from moisture

Product Classification

Product Classification

Search word