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Title: Anion exchange and extraction chromatography tandem column isolation of zirconium-89 (89Zr) from cyclotron bombarded targets using an automated fluidic platform

Journal Article · · Journal of Chromatography
ORCiD logo [1];  [1];  [1];  [2]
  1. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
  2. Oregon Health & Science Univ., Portland, OR (United States)

The long-lived positron emitter 89Zr is a highly promising nuclide employed in diagnostic Positron Emission Tomography (PET) imaging. Methods of radiochemical processing to obtain 89Zr for clinical use are traditionally performed with a single hydroxamate resin column. In this work, we present a tandem column purification method for the preparation of high-purity 89Zr from cyclotron bombarded Y metal foils. The primary column is a macroporous, strongly basic anion exchange resin on styrene divinylbenzene co-polymer. The secondary microcolumn, with an internal volume of 33 µL, is packed with an extraction chromatography resin (ExCR) loaded with HDEHP. A condition of “inverted selectivity” is presented, wherein the 89Zr elution from the primary column is synonymous with the load condition on the secondary column. The ability to transfer 89Zr from one column to the next allows two sequential column clean-up methods to be performed prior to the final elution of the 89Zr product. This approach assures delivery of very high purity 89Zr . The tandem column purification process has been implemented into a prototype automated fluidic system. Optimization of the method is presented, followed by evaluation of the process using seven cyclotron bombarded Y metal foil targets. Once optimized, we found that 93.7±2.3% of the 89Zr present in the foils was recovered in the secondary column elution fraction (0.8 M oxalic acid). Radiochromatograms of the product elution peaks enabled determination of full width at half-maximum (FWHM) and 89Zr collection yields as a function of volume. Because of the small size of the secondary microcolumn, a 89Zr product volume of ~0.28 mL is reported, which provides a substantially increased nuclide concentration over traditional methods. Finally, we evaluated the transchelation of the resulting 89Zr oxalate product to deferoxamine mesylate (DFOM) salt. We observed effective specific activities (ESA) and bindable metals concentrations ([MB]) that exceed those reported by the traditional single hydroxamate column method.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE; National Institutes of Health (NIH)
Grant/Contract Number:
AC05-76RL01830; S10-RR017229
OSTI ID:
1987542
Alternate ID(s):
OSTI ID: 1960970
Report Number(s):
PNNL-SA-169036; TRN: US2402782
Journal Information:
Journal of Chromatography, Vol. 1678; ISSN 0021-9673
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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