title: The kinetics of the swelling process and the release mechanisms of Coriandrum sativum L. essential oil from chitosan/alginate/inulin microcapsules.
abstract: The encapsulation by spray drying method of coriander essential oil (CEO) in various materials (chitosan, alginate, chitosan/alginate, chitosan/inulin) was studied. The viscoelastic properties of the oil-in-water (O/W) emulsions and the characteristics of CEO-loaded microcapsules like morphology, moisture, wettability, solubility, flowability properties, swelling and release mechanisms were investigated. The chitosan microcapsules had a brain-like structure while the alginate and chitosan/alginate microcapsules are spherical with a smooth surface. The Compressibility Index (CI=29.09-32.25%) and Hausner Ratio (HR=1.38-1.44) values showed that all the microcapsules prepared correspond to the "poor" flowability powders group. The chitosan microcapsules exhibited the maximum release rate at pH 2.5 while the alginate microcapsules exhibited the maximum release rate at pH 6.5. Kinetics and mechanism of CEO release were studied using various mathematical models such as, zero order, first order, Higuchi model and Peppas model. The diffusional exponent (n) values of Peppas equation explains a non Fickian transport mechanism and diffusion or diffusion-swelling controlled process.
authors.affiliation: "Dunărea de Jos" University of Galati, Faculty of Food Science and Engineering, "Domneasca" Str. 111, RO-800201 Galati, Romania. Electronic address: cristian.dima@ugal.ro.
authors.forename: Cristian
authors.initials: C
authors.lastname: Dima
authors.affiliation: "Dunărea de Jos" University of Galati, Faculty of Food Science and Engineering, "Domneasca" Str. 111, RO-800201 Galati, Romania.
authors.forename: Livia
authors.initials: L
authors.lastname: Pătraşcu
authors.affiliation: "Dunărea de Jos" University of Galati, Faculty of Science and Environment, "Domneasca" Str. 111, RO-800201 Galati, Romania.
authors.forename: Alina
authors.initials: A
authors.lastname: Cantaragiu
authors.affiliation: "Dunărea de Jos" University of Galati, Faculty of Food Science and Engineering, "Domneasca" Str. 111, RO-800201 Galati, Romania.
authors.forename: Petru
authors.initials: P
authors.lastname: Alexe
authors.affiliation: "Dunărea de Jos" University of Galati, Faculty of Science and Environment, "Domneasca" Str. 111, RO-800201 Galati, Romania.
authors.forename: Ştefan
authors.initials: Ş
authors.lastname: Dima
mesh_terms: D000464:Alginates / Q000737:chemistry*; D002214:Capsules / Q000737:chemistry; D048271:Chitosan / Q000737:chemistry; D028526:Coriandrum / Q000737:chemistry*; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007444:Inulin / Q000737:chemistry*; D009822:Oils, Volatile / Q000737:chemistry*; D012995:Solubility
chemical_list: D000464:Alginates; D002214:Capsules; D006603:Hexuronic Acids; D009822:Oils, Volatile; D020723:Glucuronic Acid; D007444:Inulin; D048271:Chitosan
keywords: Coriander essential oil; Kinetic swelling; Microcapsules; Release mechanism; Spray drying