DTPA

DTPA
Name	Diethylenetriaminepentaacetic acid
Formula	C14H23N3O10
Molar mass	393.34 g·mol−1
Appearance	white crystalline powder
Solubility	soluble in water

DTPA is an aminopolycarboxylic chelating agent widely used in coordination chemistry, analytical protocols, medicine, and environmental remediation. It binds polyvalent metal ions to form stable complexes, influencing workflows in laboratories run by institutions such as Massachusetts Institute of Technology, National Institutes of Health, University of Cambridge, Stanford University and industrial research at companies like BASF, Dow Chemical Company, DuPont and 3M. Its development and deployment intersect with projects and programs funded by agencies including National Science Foundation, European Commission, United States Department of Energy, Japanese Ministry of Education, Culture, Sports, Science and Technology and regulatory oversight by United States Environmental Protection Agency.

Chemical structure and properties

The molecule features a backbone derived from triethylenetetramine analogs and five acetate arms that confer hexadentate to octadentate coordination behavior observed in complexes studied at Max Planck Society, Lawrence Berkeley National Laboratory, Oak Ridge National Laboratory, CERN and Los Alamos National Laboratory. Spectroscopic characterization has been reported in literature associated with Royal Society of Chemistry, American Chemical Society, Nature Publishing Group, Science (journal) and Proceedings of the National Academy of Sciences. Protonation constants and stability constants for metal complexes have been measured in collaborations involving University of Oxford, California Institute of Technology, ETH Zurich, University of Tokyo and Imperial College London. The ligand is highly hydrophilic, with chelation thermodynamics influenced by hard/soft acid–base considerations discussed in reviews connected to Nobel Prize in Chemistry winners and frameworks used at Journal of the American Chemical Society.

Synthesis and production

Industrial and laboratory syntheses trace techniques developed in part at DuPont Research Laboratory, Rothamsted Research, Bayer, Monsanto and university labs at University of California, Berkeley, Harvard University, Yale University and Princeton University. Typical routes employ exhaustive alkylation of diethylenetriamine derivatives followed by carboxymethylation steps, paralleling methods described in protocols from Merck Group and monographs produced for American Society for Testing and Materials. Production scale-up and process optimization were topics at symposia hosted by International Union of Pure and Applied Chemistry, Gordon Research Conferences and conferences at Society of Chemical Industry headquarters. Quality control uses standards traceable to metrology labs such as National Institute of Standards and Technology and physicochemical data submitted to compilations endorsed by International Union of Pure and Applied Physics.

Uses and applications

DTPA finds application in radiopharmaceutical chelation workflows used in imaging centers associated with Mayo Clinic, Johns Hopkins Hospital, Cleveland Clinic and oncology departments at Memorial Sloan Kettering Cancer Center. It serves as a sequestrant in industrial formulations produced by BASF and Bayer for water treatment projects in collaboration with municipal programs like those in London, New York City, Tokyo and Singapore. Environmental remediation deployments occur in projects led by United States Department of Energy and contractors such as Bechtel for radionuclide mobilization studies related to sites like Hanford Site and Chernobyl. Analytical chemistry labs at European Organization for Nuclear Research, Brookhaven National Laboratory and Rutherford Appleton Laboratory use DTPA in metal speciation assays and sample preparation for instruments manufactured by Thermo Fisher Scientific and Agilent Technologies.

Pharmacology and toxicology

In clinical contexts DTPA derivatives and salts are used in decorporation therapy for internal contamination with transuranic elements, with protocols referenced by World Health Organization, Centers for Disease Control and Prevention, Food and Drug Administration and military medical units of United States Department of Defense. Pharmacokinetic and safety profiles have been evaluated in trials reported through collaborations involving University of Pennsylvania, Columbia University, Karolinska Institutet, McGill University and University of Toronto. Acute and chronic toxicity data are compiled by agencies such as European Medicines Agency and occupational safety organizations like Occupational Safety and Health Administration and Health and Safety Executive; studies often cite interactions with metals cataloged by panels convened at International Agency for Research on Cancer and National Toxicology Program. Adverse effect monitoring is incorporated into pharmacovigilance systems coordinated with United Kingdom Medicines and Healthcare products Regulatory Agency and veterinary medicine research at Royal Veterinary College.

Environmental fate and remediation

Behavior in soils, sediments and aquatic systems has been investigated in field studies at contaminated sites including Love Canal, Three Mile Island, Fukushima Daiichi nuclear disaster environs and industrialized estuaries in collaboration with researchers from Scripps Institution of Oceanography, Woods Hole Oceanographic Institution, U.S. Geological Survey and Chinese Academy of Sciences. Mobility of metal-DTPA complexes, biodegradation potential cited by teams at Environmental Protection Agency laboratories and photolysis susceptibility assessed by groups at Lawrence Livermore National Laboratory inform remediation strategies used by contractors like AECOM and NGOs such as Greenpeace and The Nature Conservancy. Remediation technologies incorporate DTPA for phytoextraction trials led by United Nations Environment Programme initiatives and agronomy departments at Iowa State University and University of Wisconsin–Madison.

Regulation and safety standards

Regulatory frameworks addressing production, transport and clinical use are enforced by European Commission, U.S. Food and Drug Administration, United States Environmental Protection Agency, Health Canada and national competent authorities such as Japan Pharmaceuticals and Medical Devices Agency and Australian Therapeutic Goods Administration. Standards for allowable residuals in water and waste streams reference criteria developed at World Health Organization and testing protocols standardized by International Organization for Standardization. International agreements on hazardous materials and radiological countermeasures, including guidelines from International Atomic Energy Agency and emergency response coordination by North Atlantic Treaty Organization, affect deployment and stockpiling decisions. Occupational exposure limits and material safety data sheet practices are harmonized with directives from European Chemicals Agency and consensus standards from American National Standards Institute.

Category:Chelating agents