Skip to main content
. 2013 Mar 28;8(3):e59810. doi: 10.1371/journal.pone.0059810

Figure 5. Effect of L-Arg or L-Lys supplementation on PROP bitterness intensity.

Figure 5

Mean values ± SEM of bitterness intensity evoked by PROP, PROP+L-Arg and PROP+L-Lys solutions in a group of 40 subjects (upper graph). The same data are shown in the lower graph for each taster group (14 non-tasters; 14 medium tasters; 12 PROP super-tasters). Control solutions containing only L-Arg or L-Lys are not shown as they did not evoke any taste perception. * = significantly different from PROP (PROP +L-Arg: F[1,37] = 27.124, p = 0.00001and PROP+L-Lys: F[1,37] = 5.949, p = 0.0196; repeated measures ANOVA). Different letters indicate significant differences (p≤0.0012; Newman-Keuls test subsequent to repeated measures ANOVA).