Effect of reaction conditions on preparations of rhenium-188 hydroxyethylidene diphosphonate complexes.

Abstract:

:Rhenium-186 (Re-186) hydroxyethylidene diphosphonate (HEDP) has been shown to localize in metastatic foci within bone in a manner similar to Tc-99m bone-seeking agents. Usually, in the preparation of diagnostic Tc-99m radiopharmaceuticals, the concentration of Tc is at trace level (10(-8) M). However, large amounts of carrier are included in the preparation of Re-186 radiopharmaceuticals (10(-4) M), which may significantly affect the preparation of Re-HEDP. In this study, Re-188 was used as an Re tracer. The effects of pH and concentrations of Re carrier on the preparation of Re-HEDP were investigated. Re-188-Sn-HEDP was prepared by reconstitution of a kit of lyophilized HEDP mixture, and tin chloride with a radioactive solution of perrhenate in saline. The total concentration of Re present in this work ranged from 10(-8) to 10(-3) M. The results showed that high labeling efficiency was obtained for each preparation. Although the chemical behaviors of the Re-188 HEDP complexes, with and without carrier, were similar, the biodistribution patterns of carrier free Re-188 HEDP in rats were found to differ from the biodistribution patterns of carrier-added Re-188 HEDP.

journal_name

Nucl Med Biol

authors

Lin WY,Hsieh JF,Lin CP,Hsieh BT,Ting G,Wang SJ,Knapp FF Jr

doi

10.1016/s0969-8051(99)00007-4

keywords:

subject

Has Abstract

pub_date

1999-05-01 00:00:00

pages

455-9

issue

4

eissn

0969-8051

issn

1872-9614

pii

S0969-8051(99)00007-4

journal_volume

26

pub_type

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