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. 2021 Mar 19;11:649148. doi: 10.3389/fonc.2021.649148

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Copyright © 2021 Jiang, Wang, Shen, Yao, Chen, Li, Li, Shen, Kou, Chen, Zhou, Luo and Cheng

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The analytic HPLC chromatogram of purified [¹⁸F]AlF-NOTA-FAPI-04, UV absorbance at 220 nm. The UV absorbance and radioactive signals were both transformed into electrical signals. (A) UV absorbance of NOTA-FAPI-04 precursor. (B) The chromatogram of [¹⁸F]AlF-NOTA-FAPI-04 measured by radioactive detector. (C) The chromatogram of [¹⁸F]AlF-NOTA-FAPI-04 measured by UV detector.