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. 2014 Mar 14;9(3):e91806. doi: 10.1371/journal.pone.0091806

Figure 6. Effects of repeated freeze-thawing on lipid metabolite stability in plasma and serum of young males.

Figure 6

Lipid metabolite levels after 10 freeze-thaw cycles were compared with those after two freeze-thaw cycles for plasma and serum samples. (A) 18∶0–18∶2 PC, (B) arachidonic acid, (C) Ch, (D) 20∶4 ChE. The graph shows medians and interquartile ranges. Statistical significance was determined by Wilcoxon matched-pairs signed-rank test (**p<0.01, ***p<0.001). PC, phosphatidylcholine; Ch, cholesterol; ChE, cholesteryl ester.