Abstract
Simple chelates and chelate conjugated monoclonal antibodies labeled with 111In, 57Co and 67Cu demonstrate marked differences in stability when exposed to a serum environment. Among these radiometals, on DTPA, the order of stability is 111In 57Co ≫ 67Cu. On benzyl-EDTA, the order of stability is 111In {reversed tilde equals} 57Co ≫ 67Cu. Among those investigated, the only serum stable 67Cu chelate found was 67Cu-TETA. The order of stability observed for 57Co vs 67Cu is contrary to published equilibrium constants. These in vitro studies suggest that the in vivo behavior of metal chelates exposed to a complex molecular environment may not be predicted by classically determined equilibrium constants.
Original language | English (US) |
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Pages (from-to) | 363-368 |
Number of pages | 6 |
Journal | International Journal of Radiation Applications and Instrumentation. |
Volume | 13 |
Issue number | 4 |
DOIs | |
State | Published - 1986 |