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. 2021 Jan 15;11(1):196. doi: 10.3390/ani11010196

Figure 1.

Figure 1

Principal component analysis on the compositional parameters (32 variables, mean centered and scaled to unit variance) of acid oils from chemical refining (AO, n = 79). (a) Score plot colored according the botanical origin (see Table 1 for abbreviations); (b) loading plot (abbreviations: M, moisture; I, insoluble impurities; U, unsaponifiable matter; MIU, sum of M, I, and U; FFA-AC, free fatty acids determined by titration (acidity); POL, polymeric compounds; TAG, triacylglycerols DAG, diacylglycerols; MAG, monoacylglycerols; FFA-SE, free fatty acids determined by size exclusion chromatography; T + T3, sum of α-, β-, γ-, and δ-tocopherols and α-, β-, γ-, and δ-tocotrienols) and U/S ratio, ratio of unsaturated to saturated fatty acids calculated as explained in Table 3.