Liquid chromatography with APCI and SALDI mass spectrometry detection using silver nanoparticles in cholesteryl esters analysis

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F17%3A00095341" target="_blank" >RIV/00216224:14310/17:00095341 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Liquid chromatography with APCI and SALDI mass spectrometry detection using silver nanoparticles in cholesteryl esters analysis

Original language description

Nonpolar lipid separation can be accomplished by several chromatographic modes according to the length of the fatty acyl chains and the number of double bonds position. Reversed-phase high performance liquid chromatography (RP-HPLC) in combination with UV detection at low wavelengths is often used for the detection of common lipids, but low sensitivity may cause difficulties. In this case, HPLC coupled to mass spectrometry with atmospheric pressure chemical ionization (APCI) can provide more specific information about studied analytes. Presented work is aimed to the combination of RP-HPLC with on-line UV and off-line mass spectrometry detection for cholesteryl esters determination. A simple HPLC method with on-line UV and APCI MS detection was proposed for analysis of cholesteryl esters with different number of double bonds in fatty acids chain in our case were selected cholesteryl ester stearate (CHS), cholesteryl ester oleate (CHE), cholesteryl ester linoleate (CHL) and cholesteryl ester arachidonate (CHA) [1]. Off-line detection was facilitated by surface-assisted laser desorption/ionization mass spectrometry (SALDI MS) using suspension of silver nanoparticles as matrix. After separation, a splitter combined with a laboratory-built spotter was used for eluent deposition on a target over a layer of silver nanoparticles for SALDI experiments [2]. The selected analytes were characterized based on comparison of identified fragment ions from spectra obtained by those two techniques. In SALDI spectra, cholesteryl esters fragment ions characteristic for fatty acids or molecular adduct ions with silver and sodium were observed. On the other hand, spectra obtained by APCI MS showed only cholesterol (Ch) fragment ion [Ch-H2O+H]+ (m/z 369.35). Combination of MS techniques with different ionization mechanisms allow obtaining complementary information for better characterization of the studied lipids. Developed method was used for determination of presented cholesteryl esters in human plasma samples.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

10406 - Analytical chemistry

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů