Exploration of the antioxidant and antimicrobialcapacity of twosunflowerproteinconcentratefilms with naturallypresentphenoliccompounds

PABLO SALGADO; M. ELVIRA LÓPEZ-CABALLERO; M. CARMEN GÓMEZ-GUILLÉN; ADRIANA MAURI; M. PILAR MONTERO,

FOOD HYDROCOLLOIDS

ELSEVIER SCI LTD

Lugar: Amsterdam; Año: 2012 vol. 29 p. 374 - 381

0268-005X

The aim of this study was to assess the potential activation of sunflower protein films  with antioxidant and antimicrobial properties conferred by the phenolic compounds ofwith antioxidant and antimicrobial properties conferred by the phenolic compounds of  sunflower seeds, which remain associated to the proteins used as starting material forsunflower seeds, which remain associated to the proteins used as starting material for  film preparation. Two sunflower protein concentrates obtained from the residual pelletfilm preparation. Two sunflower protein concentrates obtained from the residual pellet  of oil industry were used, which had different content of phenolic compounds, mainlyof oil industry were used, which had different content of phenolic compounds, mainly  chlorogenic and caffeic acid. The film-forming dispersions and the films obtained werechlorogenic and caffeic acid. The film-forming dispersions and the films obtained were analyzed regarding their antioxidant properties (using ABTS, FRAP and PCL assays)analyzed regarding their antioxidant properties (using ABTS, FRAP and PCL assays)  and their antimicrobial properties (by agar disk diffusion tests). Phenolic compoundsand their antimicrobial properties (by agar disk diffusion tests). Phenolic compounds  conferred important antioxidant properties to both dispersions and films, this activityconferred important antioxidant properties to both dispersions and films, this activity  being dependent on their content and their free or protein-bound nature. Thesebeing dependent on their content and their free or protein-bound nature. These compounds, however, did not confer their characteristic antimicrobial propertiescompounds, however, did not confer their characteristic antimicrobial properties  reported in previous studies, possibly due to their interaction with proteins and the pHreported in previous studies, possibly due to their interaction with proteins and the pH of the film-dispersions. Since the antioxidant activity of phenolic compounds wasof the film-dispersions. Since the antioxidant activity of phenolic compounds was  preserved during the protein concentration process (inherent to the film formation),preserved during the protein concentration process (inherent to the film formation), these protein matrices may be considered useful for pro tecting these bioactivethese protein matrices may be considered useful for pro tecting these bioactive compounds.compounds.