Transmetalation methods for the synthesis of PET and SPECT imaging agents
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United States of America Patent
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Feb 23, 2021
Grant Date -
Sep 1, 2016
app pub date -
Feb 26, 2016
filing date -
Feb 27, 2015
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Abstract
A process for the preparation of a radionuclide imaging agent includes providing an imaging agent including a chelated place-holder metal; loading the imaging agent onto an acid stable stationary phase; replacing the chelated place-holder metal of the imaging agent loaded on the stationary phase with a replacement radioactive metal under mild reaction conditions; and eluting the imaging agent including the chelated replacement radioactive metal from the stationary phase to provide a radionuclide imaging agent suitable for positron emission tomography (PET) or single-photon emission computed tomography (SPECT). The imaging agent can include a targeting agent that is directly conjugated to the imaging agent or by means of a linker. The process may also apply to other metals that are non-radioactive but used as diluent metals or other metals that are strongly bound to DOTA.
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