title: Electron-beam irradiation effects on phytochemical constituents and antioxidant capacity of pecan kernels [ Carya illinoinensis (Wangenh.) K. Koch] during storage.
abstract: Pecans kernels (Kanza and Desirable cultivars) were irradiated with 0, 1.5, and 3.0 kGy using electron-beam (E-beam) irradiation and stored under accelerated conditions [40 degrees C and 55-60% relative humidity (RH)] for 134 days. Antioxidant capacity (AC) using 2,2-diphenyl-1-picrylhydrazyl (DPPH) and oxygen radical absorbance capacity (ORAC) assays, phenolic (TP) and condensed tannin (CT) content, high-performance liquid chromatography (HPLC) phenolic profile, tocopherol content, peroxide value (PV), and fatty acid profiles were determined during storage. Irradiation decreased TP and CT with no major detrimental effects in AC. Phenolic profiles after hydrolysis were similar among treatments (e.g., gallic and ellagic acid, catechin, and epicatechin). Tocopherol content decreased with irradiation (>21 days), and PV increased at later stages (>55 days), with no change in fatty acid composition among treatments. Color lightness decreased, and a reddish brown hue developed during storage. A proposed mechanism of kernel oxidation is presented, describing the events taking place. In general, E-beam irradiation had slight effects on phytochemical constituents and could be considered a potential tool for pecan kernel decontamination.
authors.affiliation: Vegetable and Fruit Improvement Center, Department of Horticultural Sciences, Texas A&M University, College Station, Texas 77843-2133, USA.
authors.forename: Jose E
authors.initials: JE
authors.lastname: Villarreal-Lozoya
authors.forename: Leonardo
authors.initials: L
authors.lastname: Lombardini
authors.forename: Luis
authors.initials: L
authors.lastname: Cisneros-Zevallos
mesh_terms: D000975:Antioxidants / Q000032:analysis*; D031325:Carya / Q000737:chemistry*; D003116:Color; D005227:Fatty Acids / Q000032:analysis; D005514:Food Irradiation / Q000009:adverse effects*; D005519:Food Preservation; D010084:Oxidation-Reduction; D010636:Phenols / Q000032:analysis; D012639:Seeds / Q000737:chemistry* / Q000528:radiation effects*; D013634:Tannins / Q000032:analysis; D013997:Time Factors; D024505:Tocopherols / Q000032:analysis
chemical_list: D000975:Antioxidants; D005227:Fatty Acids; D010636:Phenols; D013634:Tannins; D024505:Tocopherols