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2 protocols using equisplash lipidomix quantitative mass spec internal standard

1

Comprehensive Lipidomics Analysis Protocol

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All LC-MS grade solvents including acetonitrile and water were purchased from Fisher Optima grade, Fisher Scientific. High purity formic acid (99%) was purchased from Thermo-Scientific. Debrisoquine and 4-nitrobenzoic acid were purchased from Sigma-Aldrich. EquiSPLASH® LIPIDOMIX® quantitative mass spec internal standard and 15:0-18:1-d7-PA, C15 Ceramide-d7 (d18:1-d7/15:0) and 18:1 Chol (D7) ester were purchased from Avanti polar lipids. Internal standard for free fatty acid (FFA), dihydroceramides (DCER), hexosylceramides (HCER), lactosylceramides (LCER) were purchased from Sciex as Lipidyzer platform kit. The LC-MS data acquisition details are provided in Supplementary data.
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2

Lipidomics Internal Standard Quantification

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EquiSPLASH™ LIPIDOMIX® Quantitative Mass Spec Internal Standard, α-mycolic acid (C80) and methoxy cis α-mycolic acid were purchased from Avanti Polar Lipids (Birmingham, AL). Optima LC-MS grade acetonitrile plus 0.1% formic acid, water plus 0.1% formic acid, methanol and 2-propanol were purchased from Fisher Chemical (Waltham, MA). LC grade chloroform was purchased from Sigma (St. Louis, MO). All other chemicals were purchased from Sigma (St. Louis, MO) and were of analytical grade quality. A 10 mM stock solution of ammonium formate at pH 6.2 was used as a standard buffer.
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