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. 2020 Nov 11;10:19566. doi: 10.1038/s41598-020-76140-z

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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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Mass spectra of iridoid glycoside standards in positive ion mode (a) and negative ion mode (b). (a) The predominant peaks arise from [M+Na]⁺ and major fragment ions arise from losses of C₆H₁₀O₅ (162 Da) and C₇H₁₄O₆ (194 Da). (b) The predominant pseudomolecular ion peak corresponds to [M–H]⁻ and major fragment ions arise from a C₁₁H₁₁O₅ (m/z 223) fragment and neutral losses of C₁₀H₁₆O₆ (232 Da) and C₁₇H₂₂O₁₀ (386 Da).