title: Analytical Characterization of Polyphenols from Tara and Caesalpinia decapetala as Stabilizers of O/W Emulsions.
abstract: The extracts (0.5% [w/w]) from Caesalpinia spinosa or tara (CS) and Caesalpinia decapetala (CD) leaves were evaluated for their ability to inhibit lipid oxidation using oil-in-water (O/W) emulsions as the model system. Liquid chromatography (LC) combined with mass spectrometry (MS), using a hybrid quadrupole time-of-flight (QTOF) mass spectrometer, was employed for (1) the identification of potential antioxidant species in the extracts and (2) to follow their evolution through aging of the emulsions. CS extracts, containing esters and conjugated forms of gallic acid (GA), turned out to be more effective than CD, rich in flavonoid species, in stabilizing the O/W emulsions. After 3 wk at 33 °C, peroxide values of emulsions stabilized with CS and CD extracts were 6.7 and 18.2 meq hydroperoxides/kg, respectively. Responses measured for the oligomers and esterified forms of GA in CS containing emulsions decreased with time; however, the response for the free form of GA kept increasing.
authors.affiliation: Chemical Engineering Dept, Univ. Politècnica de Catalunya, Av. Diagonal 647, 08028, Barcelona, Spain.
authors.forename: M Gabriela
authors.initials: MG
authors.lastname: Gallego
authors.affiliation: Dept. de Química Analítica, Nutrición y Bromatología, Inst. de Investigación y Análisis Alimentario (IIAA), Univ. de Santiago de Compostela, Santiago de Compostela, 15782, Spain.
authors.forename: Tamara
authors.initials: T
authors.lastname: Rodríguez
authors.affiliation: Dept. de Química Analítica, Nutrición y Bromatología, Inst. de Investigación y Análisis Alimentario (IIAA), Univ. de Santiago de Compostela, Santiago de Compostela, 15782, Spain.
authors.forename: Isaac
authors.initials: I
authors.lastname: Rodríguez
authors.affiliation: Chemical Engineering Dept, Univ. Politècnica de Catalunya, Av. Diagonal 647, 08028, Barcelona, Spain.
authors.forename: María Pilar
authors.initials: MP
authors.lastname: Almajano
keywords: Caesalpinia decapetala; Caesalpinia spinosa; antioxidant; lipid oxidation; oil-in-water emulsions