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. 2018 Jun 5;32(7):463–473. doi: 10.1007/s12149-018-1268-6

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 3 — HPLC chromatograms of 4-[¹⁰B]borono-2-[¹⁸F]fluoro-l-phenylalanine (l-[¹⁸F]FBPA) separation using 10 different eluents. a–j Correspond to the chromatograms with eluents 1–10. Red and blue lines show the elution profiles of radioactivity and ultraviolet (UV, 260 nm) absorbance, respectively. The unit of the vertical axis are the millvolt output of the UV detector. Elution positions of 4-[¹⁰B]borono-l-phenylalanine (l-BPA), l-FBPA, and 2-, 3-, and 4-fluoro-d,l-phenylalanine (2-, 3-, and 4-FPhe, respectively) are indicated