Corrosion inhibition of carbon steel by Vitex agnus castus leaves essential oils from the oasis of Tata

The corrosion inhibition of carbon steel in 1.0 M HCl solution of essential oils of Vitex agnus castus leaves obtained by hydrodistillation was studied using: weight loss, electrochemical impedance spectroscopy, and potentiodynamic polarization. The inhibition efficiency of the carbon steel attaints more than 79% at the concentration of 1g/L. This efficiency reaches 81.05% and 80.95%¨with the EIS and potentiodynamic polarization tests were used respectively. Polarization curves reveal that Vitex agnus castus essential oils were a mixed type inhibitor. Changes in impedance parameters (charge transfer resistance, Rt, and double-layer capacitance, Cdl) were indicative of adsorption of Vitex agnus castus essential oils on the metal surface leading to the formation of a protective film. The effect of the temperature on the corrosion behavior with the addition of the optimal concentration of Vitex agnus castus essential oils was studied in the temperature range 298– 328 K

Chemical characterization and oxidative stability of seeds and oil of sesame grown in Morocco

The objective of this research work was to determine the characteristic features of the oil content and composition of nutrients of sesame seeds grown in Morocco. Characteristic features of the seed oil revealed a high degree of unsaturation and as determined by gas chromatography reported herein, the major unsaturated fatty acids were linoleic acid (46.9%) followed by oleic acid (37.4%), while the main saturated fatty acid was palmitic acid (9.1%). Sesame seed oil was also found to be rich in tocopherols with a predominance of γ-tocopherol (90.5%). The phytosterol marker β-sitosterol accounted for 59.9% of total sterols contained in sesame seed oil. This oil, therefore, has a potential for its use in human nutrition or industrial applications. Compositional analysis revealed that the sesame seeds contained considerable amounts of protein (22%) and high amounts of lipids (52%). Nutrient information reported herein illustrates the benefits to public health for consumers of these plant seeds. In terms of oil, sesame seed oil may be considered as a valuable source for new multi-purpose products as industrial, cosmetic, and pharmaceutical uses