Indocyanine green
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IUPAC name
sodium 4-[2-[(1E,3E,5E,7Z)-7-[1,1-dimethyl-3-(4-sulfonatobutyl)benzo[e]indol-2-ylidene]hepta-1,3,5-trienyl]-1,1-dimethylbenzo[e]indol-3-ium-3-yl]butane-1-sulfonate
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| Other names
Cardiogreen; Foxgreen; Cardio-Green; Fox Green; IC Green
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3D model (Jmol)
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| ChEBI | |
| ChemSpider | |
| ECHA InfoCard | 100.020.683 |
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PubChem CID
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| Properties | |
| C43H47N2NaO6S2 | |
| Molar mass | 774.96 g/mol |
| Hazards | |
| Main hazards | Xi |
| R-phrases (outdated) | R36/37/38 |
| S-phrases (outdated) | S26 S36 |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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 (what is   ?) |
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| Infobox references | |
Indocyanine green (ICG) is a cyanine dye used in medical diagnostics. It is used for determining cardiac output, hepatic function, and liver blood flow, and for ophthalmic angiography. It has a peak spectral absorption at about 800 nm. These infrared frequencies penetrate retinal layers, allowing ICG angiography to image deeper patterns of circulation than fluorescein angiography. ICG binds tightly to plasma proteins and becomes confined to the vascular system. ICG has a half-life of 150 to 180 seconds and is removed from circulation exclusively by the liver to bile juice.
ICG is a fluorescent dye which is used in medicine as an indicator substance (e.g. for photometric hepatic function diagnostics and fluorescence angiography) in cardiac, circulatory, hepatic and ophthalmic conditions. It is administered intravenously and, depending on liver performance, is eliminated from the body with a half life of approx. 3–4 minutes. ICG sodium salt is normally available in powder form and can be dissolved in various solvents; 5% (<5% depending on batch) sodium iodide is usually added to ensure better solubility. The sterile lyophilisate of a water-ICG solution is approved in many European countries and the United States under the names ICG-Pulsion and IC-Green as a diagnostic for intravenous use.
ICG was developed in the Second World War as a dye in photography and tested in 1957 at the Mayo Clinic for use in human medicine. After being granted FDA approval in 1959, ICG was initially used primarily in hepatic function diagnostics and later in cardiology. In 1964, S. Schilling was able to determine renal blood flow using ICG. From 1969, ICG was also used in the research and diagnosis of subretinal processes in the eye (in the choroid). In the years since 1980, the development of new types of cameras and better film material or new photometric measuring devices has cleared away many technical difficulties. In the mean time, the use of ICG in medicine (and especially in fluorescent angiography in ophthalmology) has become established as standard. A distinction is therefore also made, when describing fluorescent angiography, between NA fluorescent angiography and ICGA / ICG fluorescent angiography. Around 3,000 scientific papers on ICG have now been published worldwide.
The absorption and fluorescence spectrum of ICG is in the near infrared region. Both depend largely on the solvent used and the concentration. ICG absorbs mainly between 600 nm and 900 nm and emits fluorescence between 750 nm and 950 nm. The large overlapping of the absorption and fluorescence spectra leads to a marked reabsorption of the fluorescence by ICG itself. The fluorescence spectrum is very wide. Its maximum values are approx. 810 nm in water and approx. 830 nm in blood. For medical applications based on absorption, the maximum absorption at approx. 800 nm (in blood plasma at low concentrations) is important. In combination with fluorescence detection, lasers with a wavelength of around 780 nm are used. At this wavelength, it is still possible to detect the fluorescence of ICG by filtering out scattered light from the excitation beam.
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