AI Article Synopsis
- - Wax esters are important in biological systems for energy storage and chemical signaling, with their diversity linked to different alcohol and acyl chain characteristics.
- - Traditional mass spectrometry methods like CID and HCD help analyze wax ester properties, but struggle with detailed structural aspects like double bond positions.
- - This study showcases the use of 213-nm ultraviolet photodissociation (UVPD) for more precise analysis of wax esters, revealing the method's effectiveness in determining chain lengths and locations of double bonds, especially in natural wax sources like jojoba oil.
Article Abstract
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 MS 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.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11427557 | PMC |
| http://dx.doi.org/10.1007/s00216-024-05434-2 | DOI Listing |
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