title: Microencapsulation of grape polyphenols using maltodextrin and gum arabic as two alternative coating materials: Development and characterization.
abstract: Phenolic compounds obtained from fruits have recently gained a great attention due to their bioactive roles. However, they are sensitive and they can be easily affected by physicochemical factors that create a great challenge to incorporate them into the food products. Hence, this work aimed to investigate microencapsulation of these compounds to provide a solution for this problem by improving their stability and protecting them against oxidation, light, moisture and temperature. A lab scale spray-dryer was chosen to produce microcapsules of polyphenols using different dextrose equivalents of maltodextrin and gum arabic as a coating material. Two different core: coating material ratios (1:1 and 1:2), three different maltodextrin: gum arabic ratios (10:0, 8:2 and 6:4), and four different inlet temperatures (120, 140, 160, 180°C) were investigated. When all parameters (yields, hygroscopicity, total and surface phenolic contents, antioxidant activity, individual phenolic compounds and particle morphology) were evaluated; the most efficient microcapsules were obtained with an 8:2 ratio of maltodextrin: gum arabic at 140°C inlet temperature. Microcapsules were also comprehensively studied and characterized using scanning electron microscopy (SEM) and high performance liquid chromatography (HPLC).
authors.affiliation: Ankara University, Faculty of Engineering, 06110 Ankara, Turkey.
authors.forename: Aysu
authors.initials: A
authors.lastname: Tolun
authors.affiliation: Technical University of Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany. Electronic address: zeynep.altintas@tu-berlin.de.
authors.forename: Zeynep
authors.initials: Z
authors.lastname: Altintas
authors.affiliation: Ankara University, Faculty of Engineering, 06110 Ankara, Turkey.
authors.forename: Nevzat
authors.initials: N
authors.lastname: Artik
mesh_terms: D002851:Chromatography, High Pressure Liquid; D004339:Drug Compounding / Q000379:methods*; D006170:Gum Arabic / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D010936:Plant Extracts / Q000737:chemistry*; D059808:Polyphenols / Q000737:chemistry*; D011134:Polysaccharides / Q000737:chemistry*; D027843:Vitis / Q000737:chemistry*
chemical_list: D010936:Plant Extracts; D059808:Polyphenols; D011134:Polysaccharides; C008315:maltodextrin; D006170:Gum Arabic
keywords: Antioxidant activity; Grape polyphenols; HPLC; Microencapsulation; Scanning electron microscopy