Table 13.

Concentrations of short-chain fatty acids in fecal samples

SubjectShort-chain fatty acid concn (mmol/kg [wet wt])
Control period (n = 3)Test period (n = 3)Posttest period (n = 2)
Acetic acidPropionic acidIsobutyric acidButyric acidIsovaleric acidAcetic acidPropionic acidIsobutyric acidButyric acidIsovaleric acidAcetic acidPropionic acidIsobutyric acidButyric acidIsovaleric acid
146.9 (10.5)a17.5 (3.8)1.4 (0.4)14.1 (2.7)1.5 (0.5)87.6 (3.5)25.7 (2.7)1.2 (0.2)30.2 (3.9)1.0 (0.1)41.712.61.112.21.3
265.9 (19.5)22.1 (4.5)0.9 (0.1)26.1 (6.9)0.9 (0.1)75.7 (3.2)23.2 (0.5)1.0 (0.1)32.3 (3.9)0.9 (0.1)69.6 (6.4)21.8 (0.6)0.8 (0.4)23.1 (4.5)0.8 (0.3)
368.4 (11.4)17.2 (1.9)2.5 (0.5)23.1 (4.4)3.2 (0.7)73.7 (14.4)23.2 (3.8)3.1 (1.0)20.2 (5.1)3.8 (1.3)58.9 (6.4 )14.6 (0.6)1.4 (0.2)12.8 (2.2)1.7 (0.3)
456.9 (11.5)11.5 (1.8)0.3 (0.1)12.4 (2.6)0.5 (0.1)98.8 (31.5)31.9 (12.4)3.1 (1.7)47.3 (20.7)3.7 (2.1)49.1 (26.1)12.4 (5.4)1.0 (0.3)17.9 (7.7)1.1 (0.3)
531.4 (2.8)8.6 (1.5)0.8 (0.1)8.4 (1.2)1.4 (0.2)40.1 (3.1)12.4 (1.3)1.7 (0.2)11.6 (0.8)2.2 (0.4)23.8 (12.2)5.8 (2.1)0.7 (0.7)5.5 (1.7)1.2 (0.4)
651.9 (8.2)13.0 (2.1)1.7 (0.5)14.9 (2.6)2.0 (0.7)70.3 (24.3)12.9 (3.8)0.9 (0.1)31.6 (7.5)1.0 (0.1)44.1 (11.8)15.1 (1.7)1.3 (0.1)9.7 (0.9)1.5 (0.1)
769.9 (4.1)22.4 (0.6)2.5 (0.4)28.5 (1.8)3.0 (0.7)70.6 (5.6)23.6 (3.3)2.5 (0.3)28.0 (5.3)3.4 (0.2)55.6 (3.5)18.9 (3.9)1.0 (0.1)15.1 (3.2)1.6 (0.5)
870.6 (3.0)15.7 (1.7)0.6 (0.3)17.6 (1.8)0.9 (0.1)49.4 (0.2)15.1 (3.0)1.4 (0.5)15.1 (4.7)1.7 (0.7)48.514.01.814.62.1
961.9 (15.0)28.9 (6.5)1.3 (0.2)22.9 (6.9)1.6 (0.4)59.0 (13.5)26.8 (3.9)1.7 (0.2)18.6 (4.1)2.0 (0.1)38.5 (19.7)15.6 (7.7)1.6 (0.2)12.7 (4.9)2.1 (0.2)
1056.6 (13.4)20.2 (2.2)1.6 (0.4)26.6 (5.0)2.1 (0.5)57.1 (11.2)17.1 (2.2)0.8 (0.4)24.3 (4.2)1.2 (0.4)36.5 (3.0)14.1 (1.4)1.7 (0.4)14.0 (2.5)2.2 (0.5)
  • a Mean (standard error of the mean). In most cases three fecal samples were assayed during the control or test period, one at the beginning of the period, one during the middle of the period, and one at the end of the period. For subjects 1 and 8 two samples were assayed during the test period and one sample was obtained during the posttest period.