Compartment pH Transit time (h) Volume (ml) Length (cm) Radius (cm) SEFa Pore Radius (A) Porosity/Pore Length (cm^-1)
Stomach 1.3 0.25 50 30 10 1.000 2.200 2.580
Duodenum 6 0.26 48.25 15 1.60 4.235 10.41 48.64
Jejunum 1 6.20 0.95 175.3 62 1.50 3.949 9.6400 38.90
Jejunum 2 6.40 0.76 139.9 62 1.34 3.489 8.400 26.09
Ileum 1 6.60 0.59 108.5 62 1.18 3.029 7.160 16.46
Ileum 2 6.90 0.43 79.48 62 1.01 2.569 5.920 9.540
Ileum 3 7.40 0.31 56 62 0.85 2.109 4.680 4.896
Caecum 6.40 4.50 52.92 13.75 3.50 1.790 3.920 2.915
Ascending colon 6.80 13.50 56.98 29.02 2.50 2.480 3.500 3.220
a–SEF represent Surface area Enhancement Factors which are a measure of absorptive surface area in individual compartments
Table 3: ACAT Model Parameters for the Human fasted physiology.