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There are at least 200 serogroups of V. cholerae but only two of them are causing epidemics \u2013 O1 and O139 serogroups. Fragmentation analysis of O-antigen, also known as O-specific polysaccharide (OSP), from lipopolysaccharide (LPS) is important to obtain new information about its structure, such as fragmentation patterns and fragment structures. In the present study, OSP and core (OSPc) structure from V. cholerae O139 was studied using matrix-assisted laser desorption ionization (MALDI)-time of flight (TOF) and direct injection electrospray ionization (ESI)-MS methods. MALDI-TOF analysis was performed in positive-ion reflectron mode, while ESI-MS was performed in negative ionization mode. ESI-MS analysis was followed by ESI-MS\/MS analysis. Using this analytical approach, we managed to obtain two possible fragmentation pathways of OSP from V. cholerae O139. Mutual sign of these two pathways is shortening the length of the oligosaccharide by neutral loss of monosaccharide residues. Additionally, liquid chromatography-MS analysis was performed to separate depicted molecular forms of OSPc.<\/jats:p>","DOI":"10.1177\/14690667221099119","type":"journal-article","created":{"date-parts":[[2022,5,6]],"date-time":"2022-05-06T07:21:34Z","timestamp":1651821694000},"page":"47-55","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":1,"title":["Fragmentation analysis of O-specific polysaccharide from bacteria\n                    <i>Vibrio cholerae O139<\/i>\n                    by MALDI-TOF and LC\/ESI-MS\/MS"],"prefix":"10.1177","volume":"28","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2463-7167","authenticated-orcid":false,"given":"Filip","family":"Pan\u010d\u00edk","sequence":"first","affiliation":[{"name":"Institute of Chemistry, Slovak Academy of Sciences, Bratislava, Slovak 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