0587978 - ÚOCHB 2025 RIV DE eng J - Článek v odborném periodiku
Kloudová, Barbora - Vrkoslav, Vladimír - Polášek, Miroslav - Bosáková, Z. - Cvačka, Josef
Structural characterization of wax esters using ultraviolet photodissociation mass spectrometry.
Analytical and Bioanalytical Chemistry. Roč. 416, č. 25 (2024), s. 5497-5512. ISSN 1618-2642. E-ISSN 1618-2650
Grant CEP: GA MŠMT(CZ) LX22NPO5104
Institucionální podpora: RVO:61388963 ; RVO:61388955
Klíčová slova: wax ester * UV photodissociation * photochemistry * double bond * mass spectrometry
Obor OECD: Analytical chemistry; Physical chemistry (UFCH-W)
Impakt faktor: 3.8, rok: 2023 ; AIS: 0.667, rok: 2023
Způsob publikování: Open access
Web výsledku:
https://doi.org/10.1007/s00216-024-05434-2DOI: https://doi.org/10.1007/s00216-024-05434-2

Wax esters play critical roles in biological systems, serving functions from energy storage to chemical signaling. Their diversity is attributed to variations in alcohol and acyl chains, including their length, branching, and the stereochemistry of double bonds. Traditional analysis by mass spectrometry with collisional activations (CID, HCD) offers insights into acyl chain lengths and unsaturation level. Still, it falls short in pinpointing more nuanced structural features like the position of double bonds. As a solution, this study explores the application of 213-nm ultraviolet photodissociation (UVPD) for the detailed structural analysis of wax esters. It is shown that lithium adducts provide unique fragments as a result of Norrish and Norrish-Yang reactions at the ester moieties and photoinduced cleavages of double bonds. The product ions are useful for determining chain lengths and localizing double bonds. UVPD spectra of various wax esters are presented systematically, and the effect of activation time is discussed. The applicability of tandem mass spectrometry with UVPD is demonstrated for wax esters from natural sources. The UHPLC analysis of jojoba oil proves the compatibility of MS2 UVPD with the chromatography time scale, and a direct infusion is used to analyze wax esters from vernix caseosa. Data shows the potential of UVPD and its combination with CID or HCD in advancing our understanding of wax ester structures.
Trvalý link: https://hdl.handle.net/11104/0355050