Fig. 4

Effect of pectin on the jejunum microbial tryptophan metabolism concentration. A Trp (tryptophan); B ST (Skatole); C IAA (3-Indole acetic acid); D IPA (3-indolepropionic). E 5-Hydroxyindole-3-acetic acid; F Tpm (Tryptamine); G 5-HT (5-hydroxytryptamine); H Kyn (Kynurenine). Data are presented as the mean ± SE, (n = 8). ^*P < 0.05; ^**P < 0.01; ^***P < 0.001