title: Effect of Leaves of Caesalpinia decapetala on Oxidative Stability of Oil-in-Water Emulsions.
abstract: Caesalpinia decapetala(Roth) Alston (Fabaceae) (CD) is used in folk medicine to prevent colds and treat bronchitis. This plant has antitumor and antioxidant activity. The antioxidant effects of an extract fromCaesalpinia decapetala(Fabaceae) were assessed by storage of model food oil-in-water emulsions with analysis of primary and secondary oxidation products. The antioxidant capacity of the plant extract was evaluated by the diphenylpicrylhydrazyl (DPPH), Trolox equivalent antioxidant capacity (TEAC), oxygen radical absorbance capacity (ORAC) and ferric reducing antioxidant power (FRAP) assays and by electron paramagnetic resonance (EPR) spectroscopy. Lyophilized extracts of CD were added at concentrations of 0.002%, 0.02% and 0.2% into oil-in-water emulsions, which were stored for 30 days at 33 ± 1 °C, and then, oxidative stability was evaluated. The CD extract had high antioxidant activity (700 ± 70 µmol Trolox/g dry plant for the ORAC assay), mainly due to its phenolic components: gallic acid, quercetin, catechin, 4-hydroxybenzoic acid andp-coumaric acid. At a concentration of 0.2%, the extract significantly reduced the oxidative deterioration of oil-in-water emulsions. The results of the present study show the possibility of utilizing CD as a promising source of natural antioxidants for retarding lipid oxidation in the food and cosmetic industries.
authors.affiliation: Chemical Engineering Department, Technical University of Catalonia, Av. Diagonal 647, 08028 Barcelona, Spain. maria.gabriela.gallego@upc.edu.
authors.forename: María Gabriela
authors.initials: MG
authors.lastname: Gallego
authors.affiliation: Chemical Engineering Department, Technical University of Catalonia, Av. Diagonal 647, 08028 Barcelona, Spain. skowyra.monika@gmail.com.
authors.forename: Monika
authors.initials: M
authors.lastname: Skowyra
authors.affiliation: Department of Food and Nutritional Sciences, University of Reading, Whiteknights, P.O. Box 226, Reading RG6 6AP, UK. m.h.gordon@reading.ac.uk.
authors.forename: Michael H
authors.initials: MH
authors.lastname: Gordon
authors.affiliation: Chemical Engineering Department, Technical University of Catalonia, Av. Diagonal 647, 08028 Barcelona, Spain. ainiazman@gmail.com.
authors.forename: Nurul Aini Mohd
authors.initials: NA
authors.lastname: Azman
authors.affiliation: Chemical Engineering Department, Technical University of Catalonia, Av. Diagonal 647, 08028 Barcelona, Spain. m.pilar.almajano@upc.edu.
authors.forename: María Pilar
authors.initials: MP
authors.lastname: Almajano
keywords: free radicals; lipid oxidation; oil-in-water emulsion; polyphenols