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Isopropanol extraction for cerebrospinal fluid lipidomic profiling analysis.
Ane Iriondo1, Mikel Tainta1, Jon Saldias1
1Center for Research and Advanced Therapies. CITA-Alzheimer Foundation, Mikeletegi 71, 20009 Donostia-San Sebastian, Gipuzkoa, Spain.
Talanta
|January 11, 2019
Summary
Isopropanol (IPA) precipitation is a superior method for cerebrospinal fluid (CSF) lipid extraction. This simple technique offers excellent lipid coverage, reproducibility, and recovery for untargeted lipidomic analysis.
Area of Science:
- Neuroscience
- Analytical Chemistry
- Biochemistry
Background:
- Cerebrospinal fluid (CSF) lipidomics is crucial for understanding brain signaling and neurological diseases.
- Existing CSF lipid extraction methods lack comparative studies on their effectiveness.
- Optimizing lipid extraction is vital for accurate untargeted lipidomic measurements.
Purpose of the Study:
- To compare two distinct CSF lipid extraction protocols: isopropanol (IPA) precipitation and chloroform-methanol liquid-liquid extraction.
- To evaluate and optimize CSF lipid extraction for untargeted ultra-high performance liquid chromatography-mass spectrometry (UHPLC-MS).
- To assess protocols based on simplicity, lipid coverage, reproducibility, and recovery efficiency.
Main Methods:
- Human CSF samples from healthy volunteers were used.
- Two protocols were compared: IPA protein precipitation and chloroform-methanol liquid-liquid extraction.
- Lipidomic analysis was performed using untargeted UHPLC-MS.
Main Results:
- Both methods demonstrated high reproducibility (over 75% of lipids with CV <30%).
- IPA precipitation showed better recovery for most lipid classes and was simpler and less toxic.
- IPA precipitation exhibited higher selectivity for polar lipids compared to liquid-liquid extraction.
Conclusions:
- Isopropanol (IPA) precipitation is a highly effective, simple, and reproducible method for CSF lipid extraction.
- IPA precipitation offers excellent lipid coverage and recovery, making it ideal for large-scale untargeted lipid profiling.
- This method is a preferred choice for CSF analysis using UHPLC-MS.
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