TABLE 13.
Concentrations of short-chain fatty acids in fecal samples
| Subject | Short-chain fatty acid concn (mmol/kg [wet wt])
|
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Control period (n = 3)
|
Test period (n = 3)
|
Posttest period (n = 2)
|
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| Acetic acid | Propionic acid | Isobutyric acid | Butyric acid | Isovaleric acid | Acetic acid | Propionic acid | Isobutyric acid | Butyric acid | Isovaleric acid | Acetic acid | Propionic acid | Isobutyric acid | Butyric acid | Isovaleric acid | |
| 1 | 46.9 (10.5)a | 17.5 (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) | 41.7 | 12.6 | 1.1 | 12.2 | 1.3 |
| 2 | 65.9 (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) |
| 3 | 68.4 (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) |
| 4 | 56.9 (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) |
| 5 | 31.4 (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) |
| 6 | 51.9 (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) |
| 7 | 69.9 (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) |
| 8 | 70.6 (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) | 48.5 | 14.0 | 1.8 | 14.6 | 2.1 |
| 9 | 61.9 (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) |
| 10 | 56.6 (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.