Evaluation of a chloride-based 89Zr isolation strategy using a tributyl phosphate (TBP)-functionalized extraction resin.

Abstract:

INTRODUCTION:The remarkable stability of the 89Zr-DOTA complex has been shown in recent literature. The formation of this complex appears to require 89Zr-chloride as the complexation precursor rather than the more conventional 89Zr-oxalate. In this work we present a method for the direct isolation of 89Zr-chloride from irradiated natY foils. METHODS:89Zr, 88Zr, and 88Y were prepared by 16 MeV proton irradiation of natY foils and used for batch-extraction based equilibrium coefficient measurements for TBP and UTEVA resin. Radionuclidically pure 89Zr was prepared by 14 MeV proton-irradiation of natY foils. These foils were dissolved in concentrated HCl, trapped on columns of TBP or UTEVA resin, and 89Zr-chloride was eluted in <1 mL of 0.1 M HCl. For purposes of comparison, conventionally-isolated 89Zr-oxalate was converted to 89Zr-chloride by trapping, rinsing, and elution from a QMA cartridge into 1 M HCl. Trace metal analysis was performed on the resulting 89Zr products. RESULTS:Equilibrium coefficients for Y and Zr were similar between UTEVA and TBP resins across all HCl concentrations. Kd values of <10-1 mL/g were observed for Y across all HCl concentrations. Kd values of >103 mL/g were observed at HCl concentrations >9 M for Zr, falling to Kd values of <100 mL/g at low HCl concentrations. 89Zr-chloride was recovered from small columns of TBP in <1 mL of 0.1 M HCl with an overall recovery efficiency of 89 ± 3% (n = 3). An average Y/Zr separation factor of 1.5 × 105 (n = 3) was obtained. Trace metal impurities, notably Fe, were higher in TBP-isolated 89Zr-chloride compared with 89Zr-chloride prepared using the conventional two-step procedure. CONCLUSION:TBP-functionalized resin appears promising for the direct isolation of 89Zr-chloride from irradiated natY targets. Excellent 89Zr recovery efficiencies were obtained, and chemical purity was sufficient for proof-of-concept chelation studies.

journal_name

Nucl Med Biol

authors

Graves SA,Kutyreff C,Barrett KE,Hernandez R,Ellison PA,Happel S,Aluicio-Sarduy E,Barnhart TE,Nickles RJ,Engle JW

doi

10.1016/j.nucmedbio.2018.06.003

subject

Has Abstract

pub_date

2018-01-01 00:00:00

pages

1-7

eissn

0969-8051

issn

1872-9614

pii

S0969-8051(18)30063-5

journal_volume

64-65

pub_type

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