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1-Ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC, EDAC or EDCI) is a water-soluble carbodiimide usually obtained as the hydrochloride. It is typically employed in the 4.0-6.0 pH range. It is generally used as a carboxyl activating agent for the coupling of primary amines to yield amide bonds. Additionally, EDC can also be used to activate phosphate groups in order to form phosphomono-esters and phosphodiesters. Common uses for this carbodiimide include peptide synthesis, protein crosslinking to nucleic acids, but also in the preparation of immunoconjugates. EDC is often used in combination with ''N''-hydroxysuccinimide (NHS) for the immobilisation of large biomolecules.
EDC is commercially available. It may be prepared by coupling ethyl isocyanate with ''N'',''N''-dimethylpropane-1,3-diamine to give a urea, followed by dehydration:
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