با حلال هاي آلي و بررسي خصوصيات آن SALVIA LERIIFOLIA استخراج عصاره آنتي اكسيداني برگ گياه نوروزك

Extraction of antioxidant from Salvia leriifolia leaves with organic solvents and its characteristics

Antioxidative activity of Saliva leriifolia leaves and its potential for application as a natural antioxidant was investigated. Comparison of extraction efficiency and antioxidative activities using different organic solvent extracts (i.e. methanol, ethanol, acetone, chloroform and hexan) indicated that the methanolic extract had the highest antioxidative effect on sunflower oil. The effect of three levels of methanolic extract (0.10, 0.15, 0.20% WN) on oxidative stability of sunflower oil in light and in dark (60°C) were compared with butylated hydroxytoluene (BHT) (0.02% Will) and a-tocopherol (0.04% W/V). For all treatments, peroixde and thiobarbitoric acid tests were conducted during two months with 10-day intervals. The results were analysed as a factorial experiment in a compeletly randomized design with three replicates. All the three levels of methanolic extracts showed that antioxidative activity was increased significantly (P<0.05) with increaseing in concentrations. However, antioxidative activity of methanolic extract was significantly lower than BHT and a-tocopherol (P<0.05) even at its highest concentration. Change of sunflower oil oxidation during time in the presence of different levels of methanolic extract was similar to that of BHT and a-tocopherol. Furthermore, control of oxidative rancidity with the methanolic extract, BHT and a-tocopherol, was higher in dark than in light. The results of taste panel on two products containing 0.2% of methanolic extract (the highest concentration) which were prepared at two tempratures (low and high) showed that, there was no negative effect on sensory properties.