High-Throughput Analysis of Water-Soluble Choline and Related Metabolites in Human Milk
Current Developments in Nutrition(2020)
摘要
Abstract Objectives Choline and related metabolites play important roles in metabolic processes. Inadequate provision of these nutrients to the exclusively breast-fed infant can negatively impact its healthy growth and development. Methods We developed an UPLC-MS/MS method for analyzing choline (Cho), phospho-choline (PCho), glycerophospho-choline (GPCho), total choline (tCho = Cho + PCho + GPCho), betaine, carnitine, creatinine, dimethyl glycine (DMG), methionine, and trimethylamine N-oxide (TMAO) in human milk. Results Optimized results were obtained using a Phenomenex Luna Silica (2) column, 100 × 2 mm, 3 µm, and a gradient of 0.1% aqueous propionic acid (A) and acetonitrile (B) from 60% to 90% A over 2 min (Waters ACQUITY UPLC I-Class - SCIEX 4500TQ mass spectrometer). Sample preparation required only 5–10µL of milk, diluted 1:80 in methanol/water, 4:1, v/v, prior to analysis. Quantification was done using isotopically labeled internal standards and an external standard curve. Pooled human milk used for method validation showed recovery rates from 108–131% for all analytes, and an overall process efficiency from 54 to 114%. All standard curves revealed good linearity (r > 0.999). Milk from apparently healthy Brazilian mothers (1–120days pp) revealed large concentration ranges within and between analytes (IQR, mg/L): Cho 10.3, 20.3; GPcho 48.7, 101; PCho 134, 221; tCho 120, 166; betaine 0.25, 0.53; carnitine 3.35, 5.06; creatinine 2.92, 3.90; DMG 0.26, 0.54; methionine 0.47, 0.90. 63% of the milk samples reached the tCho value used for the Adequate Intake (1–6 mo). Conclusions Our newly implemented method enabled the simultaneous analysis of water-soluble forms of choline and related metabolites in human milk in minute amounts of sample, and requiring only minimalistic sample preparation. Funding Sources Bill & Melinda Gates Foundation (OPP1148405), USDA/ARS Intramural Project (5306–51,530-019–00), and CNPq (Brazilian National Council for Science and Technology).
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