title: Effect of starch filler on calcium-alginate hydrogels loaded with yerba mate antioxidants.
abstract: A liquid extract of yerba mate (Ilex paraguariensis), with antioxidant properties was encapsulated in calcium-alginate hydrogels containing corn starch as filler at different concentrations. Hydrogel beads were characterized for morphological and size aspects, encapsulation efficiency, Fourier Transform Infrared Spectrometry (FT-IR) and thermal behavior. Addition of starch improved the encapsulation efficiency from 55 to 65%. In vitro release of polyphenols was analyzed in model gastric and intestinal media. The recovery of encapsulated polyphenols occurred mainly in the simulated gastric fluid (85%). Kinetics and release mechanism were satisfactorily fitted to semi-empirical models. The incorporation of starch filler (2 g/100 mL) in calcium alginate hydrogels modified the release profile of polyphenols in acidic medium. In calcium alginate beads, a release mechanism combining erosion and diffusion was observed. Whereas, for polyphenols release of starch loaded beads, only diffusion was relevant.
authors.affiliation: CIDCA, Centro de Investigación y Desarrollo en Criotecnología de los Alimentos, CONICET, Fac. Cs. Exactas (UNLP), 47 y 116, La Plata, Argentina. alexlcordoba@gmail.com
authors.forename: Alex
authors.initials: A
authors.lastname: López Córdoba
authors.forename: Lorena
authors.initials: L
authors.lastname: Deladino
authors.forename: Miriam
authors.initials: M
authors.lastname: Martino
mesh_terms: D000464:Alginates / Q000737:chemistry*; D000975:Antioxidants / Q000737:chemistry*; D001713:Biphenyl Compounds / Q000737:chemistry; D002152:Calorimetry, Differential Scanning; D005750:Gastric Juice / Q000737:chemistry; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D020100:Hydrogels / Q000737:chemistry; D030019:Ilex paraguariensis; D007419:Intestinal Secretions / Q000737:chemistry; D010851:Picrates / Q000737:chemistry; D010936:Plant Extracts / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013213:Starch / Q000737:chemistry*
chemical_list: D000464:Alginates; D000975:Antioxidants; D001713:Biphenyl Compounds; D006603:Hexuronic Acids; D020100:Hydrogels; D010851:Picrates; D010936:Plant Extracts; D020723:Glucuronic Acid; D013213:Starch; C004931:1,1-diphenyl-2-picrylhydrazyl