Plant lipid metabolism is a dynamic network where synthesis of essential membrane lipids overlaps with synthesis of valuable storage lipids (e.g., vegetable oils). Monogalactosyldiacylglycerol (MGDG) is a key component of the chloroplast membrane system required for photosynthesis and is produced by multiple pathways within the lipid metabolic network. The bioengineering of plants to enhance oil production can alter lipid metabolism in unexpected ways which may not be apparent by static quantification of lipids, but changes to lipid metabolic flux can be traced with isotopic labeling commonly with [14C]acetate. Because lipid classes such as MGDG are composed of many different molecular species, full analysis of metabolically labeled lipids requires separation and quantification of the
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