title: Antioxidant activity of protocatechuates evaluated by DPPH, ORAC, and CAT methods.
abstract: Hibiscus sabdariffa L. is a worldwide consumed plant, principally after infusion of its dried sepals and calyces, which are usually discarded. Nevertheless, they represent a potential source of natural bioactive compounds, e.g. polyphenols, which could add value to this under-exploited plant. Protocatechuic acid (PA) was chosen as a model of the phenolic acids that can be extracted from H. sabdariffa. In order to modify PA hydrophilic character, which limits its use in lipid-rich food products, PA was esterified to C1-C18 alcohols, and the impact of lipophilization on its antioxidant activity was evaluated in both, an homogeneous (DPPH and ORAC methods) and an heterogeneous (CAT method) system. Results herein obtained showed that, depending on the grafted alkyl chain length, lipophilization could positively affect the antioxidant activity of PA in heterogeneous media; therefore, support its use as an innovative way to synthesize molecules with an improved antioxidant capacity and potential to be used as multifunctional preservatives in food.
authors.affiliation: Montpellier SupAgro, UMR 1208 Ingénierie des Agro-polymères et Technologies Émergentes, 2 Place Viala, F-34060 Montpellier, France.
authors.forename: Claudia
authors.initials: C
authors.lastname: Grajeda-Iglesias
authors.affiliation: Universidad Autónoma de Chihuahua, Facultad de Ciencias Químicas, Universitario s/n, Campus universitario N° 2, CP 31125 Chihuahua, Chihuahua, Mexico.
authors.forename: Erika
authors.initials: E
authors.lastname: Salas
authors.affiliation: CIRAD, UMR 1208 Ingénierie des Agro-polymères et Technologies Émergentes, 2 Place Viala, F-34060 Montpellier, France.
authors.forename: Nathalie
authors.initials: N
authors.lastname: Barouh
authors.affiliation: CIRAD, UMR 1208 Ingénierie des Agro-polymères et Technologies Émergentes, 2 Place Viala, F-34060 Montpellier, France.
authors.forename: Bruno
authors.initials: B
authors.lastname: Baréa
authors.affiliation: BIOTEC, National Science and Technology Development Agency (NSTDA), 113 Thailand Science Park, Thanon Phahonyothin, Tambon Khlong Neung, Amphoe Khlong Luang, Pathum Thani 12120, Thailand.
authors.forename: Atikorn
authors.initials: A
authors.lastname: Panya
authors.affiliation: Montpellier SupAgro, UMR 1208 Ingénierie des Agro-polymères et Technologies Émergentes, 2 Place Viala, F-34060 Montpellier, France. Electronic address: maria.figueroa@supagro.fr.
authors.forename: Maria Cruz
authors.initials: MC
authors.lastname: Figueroa-Espinoza
mesh_terms: D000975:Antioxidants / Q000737:chemistry; D035264:Flowers / Q000737:chemistry*; D031584:Hibiscus / Q000737:chemistry*; D062385:Hydroxybenzoates / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry
chemical_list: D000975:Antioxidants; D062385:Hydroxybenzoates; D010936:Plant Extracts; C009091:protocatechuic acid
keywords: Antioxidant; Bioactive compounds; CAT; DPPH; Food additive; Hibiscus sabdariffa L.; Lipophilization; ORAC; Protocatechuates; Protocatechuic acid