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Table 1 Comparison ofaveraged” (AM) and dispersion convection (DC) absorption rates

From: Quantitation of small intestinal permeability during normal human drug absorption

DC Model

AM Model

PDC (10-4 cm/sec)

TD (min)

TG(min)

Fr. Absorb

PAM(10-4 cm/sec)

TG (min)

Fr. Absorb

4.167

200

15

.987

4.77

17.2

.989

0.4167

200

15

0.600

0.493

18.56

0.604

0.04167

200

15

0.109

0.0514

19.76

0.111

0.004167

200

15

0.0119

0.00517

19.9

.012

4.167

1000

15

0.999

4.167

15

0.999

0.4167

1000

15

0.658

0.522

20.8

0.690

0.04167

1000

15

0.111

0.0645

29

0.121

0.004167

1000

15

0.0119

0.0067

30

0.0129

4.167

200

60

0.997

4.155

60.0

0.997

0.04167

200

60

0.109

0.062

86

0.107

4.167

1000

60

0.999

4.167

60.0

0.999

0.04167

1000

60

0.112

0.0879

114.5

0.121

  1. The theoretical time dependent absorption rate was generated for the DC parameters listed in the table (PDC = permeability, TD and TG = the dispersion and gastric emptying time constants). For all results, TF = 240 min, r = 1 cm, L = 700 cm. The DC “Fr. Absorb” is the resultant cumulative fraction absorbed. The AM parameters (permeability (PAM), TG and Fr. Absorb) were then adjusted to obtain the optimum fit to the DC absorption rate, similar to the procedure used to determine the experimental human small intestinal permeability by deconvolution.