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. 2020 Aug 4;412(26):7085–7097. doi: 10.1007/s00216-020-02842-y

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — 2D spectra of the hop variety Citra measured by EI-MS (a) and IMS (b). The regions for monoterpene ion signals are highlighted in white, for sesquiterpene ion signals in red, respectively. All identified substances are labelled with arrows in the MS spectrum or surrounded by dashed lines in the IMS spectrum and belong to α-pinene (1), β-pinene (2), myrcene (3), limonene (4), linalool (5), β-caryophyllene (6), α-humolene (7), 2-butanone (8), 2-hexanone (9), and 2-nonanone (10). Higher molecular cluster ions (dimers) are indicated by an asterisk