title: Continuous flow mucosal cells for measuring the in-vitro permeability of small tissue samples.
abstract: Continuous-flow chambers are described for the measurement of permeability of small tissue samples. The design incorporates a large-capacity donor chamber to permit adequate loading of the applied compound and a low-volume (0.3 mL) receiving chamber that ensures rapid removal of penetrant at relatively low (1.5 mL/h or less) pumping rates. Different sized support disks allow tissue biopsies as small as 4 mm in diameter to be utilized. Comparisons of flux and permeability constants (Kp) for water across oral mucosa indicate that there was no significant difference between values obtained for 10- and 4-mm biopsies. Comparisons of flux and Kp values for porcine oral mucosa and a synthetic membrane between continuous flow and conventional, side-by-side chambers indicated that the latter values were significantly lower, suggesting stasis and inefficient removal of perfusate in the side-by-side design. The Kp values for water obtained in the continuous-flow chambers with pig skin were similar to those published elsewhere for human skin.
authors.affiliation: Dows Institute for Dental Research, University of Iowa, Iowa City 52242, USA.
authors.forename: C A
authors.initials: CA
authors.lastname: Squier
authors.forename: M
authors.initials: M
authors.lastname: Kremer
authors.forename: P W
authors.initials: PW
authors.lastname: Wertz
mesh_terms: D000818:Animals; D008567:Membranes, Artificial; D009061:Mouth Mucosa / Q000166:cytology / Q000378:metabolism*; D010539:Permeability; D012867:Skin / Q000166:cytology / Q000378:metabolism*; D013552:Swine
chemical_list: D008567:Membranes, Artificial