PCA scores plots of ISO-induced MI rat serum. The rats were administrated with test drugs for 7 days at the same doses of 5 g/kg·w·d and twice injections of ISO on days 6 and 7 to induce MI model. The samples were collected on the day 7. Serum samples were analyzed using UPLC/TOF-MS and the data were processed by PCA in the software SIMCA-P package. SLF 8:2, 7:3, and 6:4 represent the ratios of PG to SM. Details of the experimental procedures are given in Materials and Methods.