2.1. Materials and chemicals
Senjed (Elaeagnus angustifolia L.) fruit obtained from the
traditional market (Azarshahr, Iran) and were separated manually from
the peel, then the separated peels were dried in an oven at 40 °C till
the constant moisture content of 7.5%. Sesame oil was freshly prepared
from a traditional cold-pressed oil manufacture (Azarshahr, Iran).
1,1-Diphenyl-2-picrylhydrazyl (DPPH), gallic acid, (+) catechin
1,1,3,3,-tetramethoxypropane and tert-Butylhydroquinone (TBHQ) were
purchased from Sigma Chemical Co. (St. Louis, MO, USA).
Folin–Ciocalteau reagent, isooctane solvent and p-anisidine reagent
were purchased from E. Merck Co. (Darmstadt, Germany). All other
reagents were of analytical grade.