Fig. 1From: The propionic acid and butyric acid in serum but not in feces are increased in patients with diarrhea-predominant irritable bowel syndromeGas chromatograms of SCFAs in feces A. Peak identification: a, acetic acid; b, propionic acid; c, butyric acid. The chromatograms of SCFAs in serum B. Peak identification: d, propionic acid; e, butyric acidBack to article page