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Analytical and Bioanalytical Chemistry

, Volume 411, Issue 3, pp 765–776 | Cite as

A new anion exchange purification method for Cu stable isotopes in blood samples

  • Shun-Chung YangEmail author
  • Lisa Welter
  • Anand Kolatkar
  • Jorge Nieva
  • Kathryn R. Waitman
  • Kuo-Fang Huang
  • Wen-Hsuan Liao
  • Shotaro Takano
  • William M. Berelson
  • A. Joshua West
  • Peter Kuhn
  • Seth G. John
Research Paper

Abstract

The isotopic composition of iron, zinc, copper, and cadmium (δ56Fe, δ66Zn, δ65Cu, and δ114Cd) are novel and promising tools to study the metabolism and homeostasis of trace metals in the human body. Serum δ65Cu has been proposed as a potential tool for diagnosis of cancer in liquid biopsy, and other metals may have similar utility. However, accurate analysis of trace metal isotopes is challenging because of the difficulties in purifying the metals from biological samples. Here we developed a simple and rapid method for sequential purification of Cu, Fe, Zn, and Cd from a single blood plasma sample. By using a combination of 11 M acetic acid and 4 M HCl in the first steps of column chemistry on AG-MP1 resin, we dramatically improve the separation of Cu from matrix elements compared to previous methods which use concentrated HCl alone. Our new method achieves full recovery of Cu, Fe, Zn, and Cd to prevent column-induced isotope fractionation effects, and effectively separates analytes from the matrix in order to reduce polyatomic interferences during isotope analysis. Our methods were verified by the analysis of isotope standards, a whole blood reference material, and a preliminary sample set including five plasma samples from healthy individuals and five plasma samples from cancer patients. This new method simplifies preparation of blood samples for metal isotope analysis, accelerating multi-isotope approaches to medical studies and contributing to our understanding of the cycling of Fe, Zn, Cu, and Cd in the human body.

Graphical abstract

Keywords

δ56Fe δ66Zn δ65Cu δ114Cd Chromatography Blood 

Notes

Acknowledgements

We would like to thank Nick Hawco, Paulina Pinedo-Gonzalez, and Irit Tal for technical support. We would also like to thank Editor Alfredo Sanz-Medel and two anonymous referees for their helpful comments.

Funding information

This work was supported by NSF award 1636332.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

All sampling procedures were approved by the University of Southern California, University Park Institutional Review Board (FWA no. 00007099), and the Scripps Health Green Hospital Institutional Review Board (FWA no. 00000411). All study participants provided written informed consent.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Shun-Chung Yang
    • 1
    Email author
  • Lisa Welter
    • 2
  • Anand Kolatkar
    • 2
  • Jorge Nieva
    • 3
  • Kathryn R. Waitman
    • 4
  • Kuo-Fang Huang
    • 5
  • Wen-Hsuan Liao
    • 6
  • Shotaro Takano
    • 7
  • William M. Berelson
    • 1
  • A. Joshua West
    • 1
  • Peter Kuhn
    • 2
    • 3
  • Seth G. John
    • 1
  1. 1.Department of Earth SciencesUniversity of Southern CaliforniaLos AngelesUSA
  2. 2.Bridge InstituteUniversity of Southern CaliforniaLos AngelesUSA
  3. 3.Keck School of MedicineUniversity of Southern CaliforniaLos AngelesUSA
  4. 4.Billings ClinicBillingsUSA
  5. 5.Institute of Earth SciencesAcademia SinicaTaipeiTaiwan
  6. 6.Research Center for Environmental ChangesAcademia SinicaTaipeiTaiwan
  7. 7.Institute for Chemical ResearchKyoto UniversityKyotoJapan

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