Abstract
Extraction of lipids from biological samples is a critical step in lipidomics, especially for shotgun lipidomics where lipid extracts are directly infused into a mass spectrometer. The butanol–methanol (BUME) extraction method was originally developed to extract lipids from plasma samples with 1 % acetic acid. Considering some lipids are sensitive to acidic environments, we modified this protocol by replacing acetic acid with lithium chloride solution and extended the modified extraction to tissue samples. Although no significant reduction of plasmalogen levels in the acidic BUME extracts of rat heart samples was found, the modified method was established to extract various tissue samples, including rat liver, heart, and plasma. Essentially identical profiles of the majority of lipid classes were obtained from the extracts of the modified BUME and traditional Bligh–Dyer methods. However, it was found that neither the original, nor the modified BUME method was suitable for 4-hydroxyalkenal species measurement in biological samples.
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Abbreviations
- 4-HA:
-
4-Hydroxyalkenal
- 4-HNE:
-
4-Hydroxy-2E-nonenal
- BUME:
-
Butanol–methanol
- Cer:
-
Ceramide
- CerPCho:
-
Sphingomyelin
- ChoGpl:
-
Choline glycerophospholipids
- ESI:
-
Electrospray ionization
- EtAc:
-
Ethyl acetate
- EtnGpl:
-
Ethanolamine glycerophospholipids
- Fmoc:
-
Fluorenylmethyloxycarbonyl
- HPLC:
-
High performance liquid chromatography
- lysoPtdCho:
-
Lyso phosphatidylglycerol
- lysoPtdEtn:
-
Lyso phosphatidylethanolamine
- IS:
-
Internal standard
- MS:
-
Mass spectrometry
- MTBE:
-
Methyl-tert-butyl ether
- nESI:
-
Nano-electrospray ionization
- NLS:
-
Neutral loss scan
- PlsEtn:
-
Ethanolamine plasmalogen
- PlsCho:
-
Choline plasmalogen
- PBS:
-
Phosphate-buffered saline
- Ptd2Gro:
-
Cardiolipin
- PtdCho:
-
Phosphatidylcholine
- PtdEtn:
-
Phosphatidylethanolamine
- PtdGro:
-
Phosphatidylglycerol
- PtdIns:
-
Phosphatidylinositol
- PtdOH:
-
Phosphatidic acid
- PtdSer:
-
Phosphatidylserine
- TAG:
-
Triacylglycerol(s)
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Acknowledgments
This work was partially supported by National Institute of General Medical Sciences Grant R01 GM105724 and intramural institutional research funds.
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Cruz, M., Wang, M., Frisch-Daiello, J. et al. Improved Butanol–Methanol (BUME) Method by Replacing Acetic Acid for Lipid Extraction of Biological Samples. Lipids 51, 887–896 (2016). https://doi.org/10.1007/s11745-016-4164-7
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DOI: https://doi.org/10.1007/s11745-016-4164-7