Table 1.

Permeability coefficients for metabolites and oxygen (PmO₂) in presence of a polyamide membrane (pore size 0.2 μm) with and without mucus layer (200 μm) (n = 2)

Polyamide membrane	FITC dextran			Oxygen
	4 kDa	20 kDa	150 kDa
With mucus	2.4 ± 10−6	2.5 ± 10−7	7.1 ± 10−9	2.5 ± 10−4
Without mucus	5.6 ± 10−6	4.1 ± 10−7	6.5 ± 10−7	NDa

^aND = not determined.

Data are expressed as cm sec⁻¹. The permeation coefficient was lower in presence of the mucus and with the increase of the FITC dextran kDa.