title: Stability of canola oil encapsulated by co-extrusion technology: effect of quercetin addition to alginate shell or oil core.
abstract: This study examines the co-extrusion encapsulation of canola oil by alginate, with an antioxidant (quercetin) incorporated either in the oil core or alginate shell. Optical and environmental scanning electron microscopy revealed spherical beads of diameter ∼350μm and wall thickness ∼65μm. Bead appearance, size, wall thickness and surface characteristics did not change appreciably after treatments at pH 3 for 2h, pH 6.5 for 2h or pH 6.5 for 1min then pH 3 for 2h, although the amounts of phenolics released from beads differed depending on the conditions. The quercetin addition approach strongly influenced the stability of canola oil during storage at 20 and 38°C. Quercetin in the core more effectively suppressed oil deterioration. Quercetin in shell caused a higher phenolic content after storage. FTIR and HPLC analyses were used to track changes in the chemical composition of the encapsulated oil beads during storage.
authors.affiliation: School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland, New Zealand.
authors.forename: Geoffrey I N
authors.initials: GI
authors.lastname: Waterhouse
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Dongxiao
authors.initials: D
authors.lastname: Sun-Waterhouse
mesh_terms: D000464:Alginates / Q000737:chemistry*; D000975:Antioxidants / Q000032:analysis; D005229:Fatty Acids, Monounsaturated / Q000737:chemistry*; D005519:Food Preservation / Q000379:methods*; D061353:Food Storage; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D011794:Quercetin / Q000737:chemistry*; D000074262:Rapeseed Oil
chemical_list: D000464:Alginates; D000975:Antioxidants; D005229:Fatty Acids, Monounsaturated; D006603:Hexuronic Acids; D000074262:Rapeseed Oil; D020723:Glucuronic Acid; D011794:Quercetin
keywords: Alginate; Canola oil; Co-extrusion encapsulation; Quercetin