title: Physical and chemical stability of gum arabic-stabilized conjugated linoleic acid oil-in-water emulsions.
abstract: Oil-in-water (O/W) emulsions have been used as a delivery system to protect conjugated linoleic acid (CLA), a polyunsaturated fatty acid, from oxidation. Conventional gum arabic (GA) and two matured gum arabic samples (EM2 and EM10) were used as emulsifiers to prepare CLA-in-water emulsions. The emulsions have optimal physical and chemical stability at gum concentrations of 5% for all three gums. Emulsions with higher gum concentrations are more susceptible to lipid oxidation. This is attributed to reduced physical stability at higher gum concentrations because of the coalescence and depletion-induced flocculation of the emulsion droplets. The prooxidants iron and copper intrinsically contained in the gums could also contribute to this instability. Among the three gums, EM10 provides the most effective protection for CLA both physically and chemically, because of its superior interfacial properties over GA and EM2.
authors.affiliation: Glyn O. Phillips Hydrocolloid Research Centre at HUT, School of Food and Pharmaceutical Engineering, Faculty of Light Industry, Hubei University of Technology, Wuhan 430068, China.
authors.forename: Xiaolin
authors.initials: X
authors.lastname: Yao
authors.forename: Qiong
authors.initials: Q
authors.lastname: Xu
authors.forename: Dazhi
authors.initials: D
authors.lastname: Tian
authors.forename: Nana
authors.initials: N
authors.lastname: Wang
authors.forename: Yapeng
authors.initials: Y
authors.lastname: Fang
authors.forename: Zhongyang
authors.initials: Z
authors.lastname: Deng
authors.forename: Glyn O
authors.initials: GO
authors.lastname: Phillips
authors.forename: Jiang
authors.initials: J
authors.lastname: Lu
mesh_terms: D055598:Chemical Phenomena; D003300:Copper / Q000737:chemistry; D004355:Drug Stability; D045703:Emulsifying Agents / Q000737:chemistry; D004655:Emulsions / Q000737:chemistry; D006170:Gum Arabic / Q000737:chemistry*; D007501:Iron / Q000737:chemistry; D044243:Linoleic Acids, Conjugated / Q000737:chemistry*; D008853:Microscopy; D010084:Oxidation-Reduction; D010316:Particle Size; D014867:Water / Q000737:chemistry
chemical_list: D045703:Emulsifying Agents; D004655:Emulsions; D044243:Linoleic Acids, Conjugated; D014867:Water; D003300:Copper; D006170:Gum Arabic; D007501:Iron