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. 2018 Aug 22;6:342. doi: 10.3389/fchem.2018.00342

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Copyright © 2018 Münger, Boulos and Nyström.

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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Proposed MS/MS fragmentation pathways for the formation of characteristic ions resulting from C-ring fragmentation in case of (A) Δ⁵-sterol, (B) Δ⁷-sterol, (C) stanol, and (D) Δ⁵,Δ⁷-sterol, as well as (E) partial C-ring fragmentation. Also shown are proposed mechanisms for side chain loss in case of (F) any Δ²²-sterols, (G) any sterols or stanols with saturated side chain, and partial side chain loss in the case of (H) a Δ⁵,Δ²²-sterol, and (I) a Δ⁵,Δ^24(24¹)-sterol.