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. 2023 Oct 25;14:6795. doi: 10.1038/s41467-023-42575-x

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© The Author(s) 2023

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. 6 — a Extracted ions chromatogram and structures of the most abundant O-glycans (>0.1% relative concentration) of bovine submaxillary mucin (BSM) released with neutralized hypochlorite at pH 6.8 (n = 1). Ser and Thr refer to the conjugated amino acid in bovin submaxillary mucin. After release, the O-glycan previously conjugated to Ser is detected as a glycolic acid glycoside and to Thr as a lactic acid glycoside. b ATDs and CCS of O-acetylated Neu5Ac B1 ion of selected O-glycan structures of BSM (n = 1). ATD in blue. Left dashed line corresponds to the B1 ion from the 7-O-acetylated Neu5Ac standard. Right dashed line corresponds to the B₁ ion from 9-O-acetylated Neu5Ac standard. c Stacked ATDs and CCS of B₁ ions from di-O-acetylated Neu5Ac of BSM. Dashed line corresponds to the B1 ion from the 7,9-di-O-acetylated Neu5Ac standard.