title: Biocompatibility of microcapsules for cell immobilization elaborated with different type of alginates.
abstract: The biocompatibility of alginate-PLL-alginate (APA) microcapsules has been evaluated with respect to impurity levels. The impurity content of three different alginates (a raw high M-alginate, a raw high G-alginate and a purified high G-alginate) has been determined and the in vivo antigenic response of APA beads made with each alginate assessed. Results show that purification of the alginate not only reduces the total amount of impurities (63% less in polyphenols, 91.45% less in endotoxins and 68.5% less in protein in relation to raw high M-alginate), but also avoids an antibody response when microcapsules of this material are implanted in mice. In contrast, raw alginates produced a detectable antibody response though the differences in their impurity content. Consequently, this work revealed that purity of the alginate rather than their chemical composition, is probably of greater importance in determining microcapsule biocompatibility.
authors.affiliation: Laboratory of Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of the Basque Country, Vitoria-Gasteiz, Spain.
authors.forename: G
authors.initials: G
authors.lastname: Orive
authors.forename: S
authors.initials: S
authors.lastname: Ponce
authors.forename: R M
authors.initials: RM
authors.lastname: Hernández
authors.forename: A R
authors.initials: AR
authors.lastname: Gascón
authors.forename: M
authors.initials: M
authors.lastname: Igartua
authors.forename: J L
authors.initials: JL
authors.lastname: Pedraz
mesh_terms: D000464:Alginates / Q000378:metabolism / Q000494:pharmacology*; D000818:Animals; D001672:Biocompatible Materials; D002214:Capsules; D004731:Endotoxins / Q000378:metabolism; D005419:Flavonoids; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D010636:Phenols / Q000378:metabolism; D011108:Polymers / Q000378:metabolism; D059808:Polyphenols; D013050:Spectrometry, Fluorescence
chemical_list: D000464:Alginates; D001672:Biocompatible Materials; D002214:Capsules; D004731:Endotoxins; D005419:Flavonoids; D010636:Phenols; D011108:Polymers; D059808:Polyphenols