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Simultaneous total analysis of core and polar membrane lipids in archaea by high‐performance liquid chromatography/high‐resolution mass spectrometry coupled with heated electrospray ionization
Author(s) -
Horai Shunsuke,
Yamauchi Noriaki,
Naraoka Hiroshi
Publication year - 2019
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.8506
Subject(s) - chemistry , chromatography , electrospray ionization , mass spectrometry , atmospheric pressure chemical ionization , elution , liquid chromatography–mass spectrometry , polar , analytical chemistry (journal) , chemical ionization , ionization , organic chemistry , ion , physics , astronomy
Rationale Archaea have characteristic membrane lipids including diether and/or tetraether isoprenoidal core lipids with various polar head groups. Since the polar group is removed soon after the end of archaeal activity, the occurrences of core and polar lipids are regarded as dead and active signals, respectively. The core and polar lipids have generally been analyzed separately using atmospheric pressure chemical ionization (APCI) and electrospray ionization (ESI), respectively, coupled with mass spectrometry. Methods In this study, simultaneous analyses of core and polar archaeal lipids have been examined using heated electrospray ionization (HESI) by high‐performance liquid chromatography/high‐resolution mass spectrometry (HPLC/HRMS). Results Both core and intact polar lipids can be analyzed simultaneously by HESI with good sensitivity (sub ng to 100 ng) and separation using a semi‐bore diol column by normal‐phase chromatography. The core lipids eluted firstly to separate archeaol, then glycerol dibiphytanyl glycerol tetraethers (GDGTs), followed by the polar lipids with glycosides and glycophosphates. The relative GDGT composition is identical between HESI and APCI methods. Conclusions The simultaneous analysis has the benefit of minimizing sample amount and elution solvent as well as preparation work. The method can also be applied to a compound class fractionation for compound‐specific carbon and hydrogen isotope analysis.