The aim of this study was to investigate the effect of using portulaca oleracea as a source of plant antioxidants for feeding fattening male lambs, on carcass traits, meat quality, and oxidative stability. Twenty-one male lambs with an average weight of 24±1.5 kg and 150±15 days old were fed with one of the experimental rations included a diet without portulaca oleracea as control, a diet containing 7.5%, and a diet containing 15% portulaca oleracea, for 84 days. The muscle (Longissimus dorsi) samplewas used to determine pH, chemical composition, colorimetric properties, and oxidative stability of meat. Meat lipid oxidation was determined after 1, 7, and 30 days of refrigerated storage using thiobarbituric acid (TBARS). The use of portulaca oleracea in diets improved meat color characteristics such as L, chroma, and Hue. The highest ash concentration and the lowest meat moisture were observed in the treatment of 15% portulaca oleracea (P<0.05). Meat pH was the lowest in the first hour after slaughter but did not differ at 24 h. Compared to the control, in both treatment groups feeding the lambs with portulaca significantly reduced the concentration of Malondialdehyde in the meat of the lambs and increased the meat oxidative stability (P<0.05). The results of this experiment showed that feeding portulaca oleracea by improving properties such as color and increasing the meat oxidative stability improves meat quality, which may have lead to an increase in its nutritional value in terms of human health.

Oil in foodstuff deep frying heated to a long time and effect of some factors (humidity, temperature and oxygen) cause different chemical and physical changes of the oil (such as hydrolysis, oxidation and polymerization) and degrade the quality of the oil and product. The results of these changes increase of the free fatty acids, peroxide value, polar compounds and trans isomers, and also decrease of the unsaturated fatty acids, oxidation induction time, levels of tochopherol and phenolic compounds, which all indicate a decline the oil quality. Studies shows that the chemical composition of oil and especially natural antioxidants are important parameters in predictive the behavior of oil in the frying process. Independently to the commercial category of olive oil, is clearly resistant against the deep frying. In this paper, the oxidative stability of oil during frying according to the source, the presence of natural bioactive compounds (antioxidants) and fatty acid composition have been compared with olive oil.

Walnut (Juglans regia L. ) is a tree with significant economic value and usage for human health and various food industries. However, fresh walnut kernels are a less widespread product than the dried kernels. This study aimed to determine the fresh walnut kernel properties including, fatty acid composition, proximate composition, total phenolics (TPs), total antioxidant capacity (TAC), acidic, peroxide and saponification values of extracted oil and minerals of fresh walnuts kernels. Green walnut fruits were harvested on commercial maturity. The content of different fatty acids (%) was determined as 16: 0; 5. 91, 18: 1; 77. 7, 18. 2; 11. 13 and 18: 3; 2. 84. Also, the essential nutritional compounds such as protein content (16 ± 0. 67), ash (3± 0. 32), water (20 ± 0. 49), fat (40 ± 0. 22) and total carbohydrate (21 ± 0. 23) were quantified and reported in percentages. The energy content was 508 ± 0. 48 kcal. Acidic values, peroxide values and saponification values in walnut oil were 3 ± 0. 14, 0. 3 ± 0. 06 and 130 ± 0. 54 respectively. Furthermore, the average mineral contents were also determined. In general, it can be claimed that fresh walnuts have significant amounts of protein, oil and minerals, and higher water content in comparison with dry nuts. Nonetheless, our results in comparison with the information available about dry walnuts showed that fresh walnuts contained less oil content compared to dried fruits.

The aim of this study is to describe the physicochemical properties of khinjuk kernel oil and oxidative stability of it was compared to virgin olive oil. Investigation showed that Kernel of Khinjuk has 30٪ oil. Kernel oil contains more than 80 percentages unsaturated fatty acids (USFA) and dominant fatty acid is oleic acid (57.39%). Iodine value, saponification number, total tocopherols, total sterols, Refractive Index and wax content were 98.7 g I/g, 172.3 mg KoH/g, 619.4 mg/Kg, 0.25%, 1.47 Degree and 0.002% respectively. In this research, also oxidative stability during 8 hours of heating process at 170 Ċ for khinjuk kernel oil and virgin olive oil were determined and compared. Oxidative Stability results based on data such as Peroxide Value, acidity value, Conjugated Diene Value (CDV), Oil/Oxidative Stability Index (OSI) and Carbonyl value (CV) were analyzed. The results of the comparison at different times of the thermal process showed that there was statistically Significant differences between means of CDV and OSI, but the CV means was not significantly among the oils. Finally due to the low values of conjugate and peroxides compounds and high OSI, oxidative stability of khinjuk kernel oil was more than virgin olive oil, that can be attributed to antioxidant compound specifically tocopherols.