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- W2343693519 abstract "The cationic complex technetium (2-carbomethoxy-2-isocyanopropane)6+ (99mTc-CPI) contains terminal ester groups that were included to provide a pathway for in-vivo metabolism of this compound, thereby enhancing its performance as a myocardial perfusion agent. Biodistribution studies of the compound demonstrated myocardial accumulation in rabbit, guinea pig, and chick, but not in rat and mouse. Radiochemical analysis by HPLC after in-vitro incubation of 99mTc-CPI in blood plasma from the various species confirmed enzymatic hydrolysis to numerous new compounds. Rat and mouse serum produced complete hydrolysis of this agent after incubation for less than 5 sec at 25 degrees C or rates greater than 500 times those observed in human, rabbit, guinea pig and chick serum. Chemical synthesis and isolation of the monohydrolyzed species with subsequent biodistribution studies in guinea pig and rabbit confirmed that this neutral lipophilic complex did not accumulate in heart tissue. It is concluded that varying rates of enzymatic in-vivo hydrolysis produce the interspecies biodistribution differences and may account for the moderate myocardial clearance relative to other isonitrile complexes." @default.
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- W2343693519 date "1992-07-01" @default.
- W2343693519 modified "2023-09-23" @default.
- W2343693519 title "Interspecies variation in biodistribution of technetium (2-carbomethoxy-2-isocyanopropane)6+." @default.
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