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. 2022 Jan 4;8:806744. doi: 10.3389/fnut.2021.806744

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Copyright © 2022 Kil, Han, Hong, Kim, Park, Choi and Nam.

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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Comparison of (A) ¹H-¹³C HSQC and HMBC correlations and (B) ¹³C NMR signals of C-2 and NCH₃ of betaine (Bt), choline sulfate (CS), and choline (Cho) in PWB. (C) Spiking ¹H NMR experiments with commercial standards of CS, phosphocholine, and glycerophosphocholine.