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2016 ; 6
(ä): 33756
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Differential human urinary lipid profiles using various lipid-extraction
protocols: MALDI-TOF and LIFT-TOF/TOF analyses
#MMPMID27646409
Tipthara P
; Thongboonkerd V
Sci Rep
2016[Sep]; 6
(ä): 33756
PMID27646409
show ga
Changes in lipid levels/profiles can reflect health status and diseases. Urinary
lipidomics, thus, has a great potential in clinical diagnostics/prognostics.
Previously, only chloroform and methanol were used for extracting lipids from the
urine. The present study aimed to optimize lipid extraction and examine
differential lipid classes obtained by various extraction protocols. Urine
samples were collected from eight healthy individuals and then pooled. Lipids
were extracted by six solvent protocols, including (i) chloroform/methanol (1:1,
v/v), (ii) chloroform/methanol (2:1, v/v), (iii) hexane/isopropanol (3:2, v/v),
(iv) chloroform, (v) diethyl ether, and (vi) hexane. Lipid profiles of the six
extracts were acquired by MALDI-TOF mass spectrometry (MS) and some lipid classes
were verified by LIFT-TOF/TOF MS/MS. The data revealed that phosphatidylglycerol
(PG) and phosphatidylinositol (PI) could be detected by all six protocols.
However, phosphatidylcholine (PC) and sphingomyelin (SM) were detectable only by
protocols (i)-(iv), whereas phosphatidylserine (PS) was detectable only by
protocols (iii)-(vi), and phosphatidylethanolamine (PE) was detectable only by
protocols (v)-(vi). In summary, we have demonstrated differential lipidome
profiles yielded by different extraction protocols. These data can serve as an
important source for selection of an appropriate extraction method for further
highly focused studies on particular lipid classes in the human urine.