The LPA C18:2, LPC C18:2, and phosphatidylcholine (PC) C16:0–18:2/PC C18:0–18:2 contents in the KRGM gintonin were determined using liquid chromatography with tandem mass spectrometry LC-MS-MS. The standard markers for LPA, LPC, and PC were identically prepared in high-pressure liquid chromatography (HPLC)-grade methanol, and the solutions were stored at 4 °C. An Agilent series 1100 HPLC instrument (Agilent Technologies, Santa Clara, CA, USA) and an API 2000 LC-MS/MS system (Applied Biosystems, Foster City, CA, USA) were used as previously described [15 (link),19 (link)]. The resultant data were given as mean ± relative standard deviation (%) from three different samples of KRGM gintonin.
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