Fig. 1
From: Lactobacilli possess inhibitory activity against dipeptidyl peptidase-4 (DPP-4)
DPP-4 inhibitory activity of lactobacilli and other bacteria. The figure shows the percentage DPP-4 inhibitory activity demonstrated by heat-killed sonicated extracts of Lactobacillus strains (Lb 1–15) isolated from human infant faecal samples, Lactobacillus reference strains (Ref 1–7), a Gram-positive control (Bifidobacterium bifidum, Ctrl 1) and two Gram-negative controls (Escherichia coli K12 - Ctrl 2 and Salmonella Typhimurium - Ctrl 3). Negative values indicate the presence of DPP-4-like activity. Data are expressed as mean ± SEM. *p < 0.05, **p < 0.01 and ***p < 0.001 compared with vehicle control. ns = not statistically significant