title: [Theoretical calculation and experimental study of membrane thickness of alginate-(poly-L-lysine)-alginate microcapsules].
abstract: Alginate-(Poly-L-Lysine)-Alginate(APA) microcapsules were prepared by Electrostatic Droplet Generator(EDG) technique and the thickness of microcapsule membrane, which was composed by polyelectrolyte complex, were studied in this paper. The theoretical formula was given for the measurement of membrane thickness of APA microcapsules by element analysis of membrane and calculation. The membrane thickness was 7-10 microns by theoretical calculation. On the other hand, the thickness of membrane was measured by SEM and optical microscopy and the results were 7 microns and 12 microns, respectively. The results showed that theoretical calculation is in good accordance with experimental determoination of mermbrane thickness and the membrane thickness of APA microcapsule is about 7-10 microns. The optical microscopy is an easy way to measure membrane thickness.
authors.affiliation: School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072. tdxsun@eyou.com
authors.forename: Duoxian
authors.initials: D
authors.lastname: Sun
authors.forename: Yiqing
authors.initials: Y
authors.lastname: Chen
authors.forename: Jun
authors.initials: J
authors.lastname: Yang
authors.forename: Jing
authors.initials: J
authors.lastname: Su
authors.forename: Anthony M
authors.initials: AM
authors.lastname: Sun
mesh_terms: D000464:Alginates; D002214:Capsules; D008432:Mathematical Computing; D008567:Membranes, Artificial; D011107:Polylysine / Q000031:analogs & derivatives*; D013057:Spectrum Analysis
chemical_list: D000464:Alginates; D002214:Capsules; D008567:Membranes, Artificial; C051546:alginate-polylysine-alginate; D011107:Polylysine