Background & Aim: Medicinal plants can be a good replacement for common cancer treatment including chemotherapy, radiation therapy and surgery because they don’t have many side effects. The aim of this study was to investigate the effect of temperature on the free radical scavenging in the presence of medicinal plants.Experimental: For determination of free radical scavenging activity was used the stable 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay at different temperatures. Ethanolic extracts of Sage (Salvia officinalis), red cabbage (Brassica oleracea), walnut (Juglans regia L.), yellow sweet clover (Melilotus officinalis) and hawthorn (Crataegus oxyacantha) one by one and then the mixtures of each pair of plants were investigated.Results: The most free radical scavenging percentages are related to plants in single forms not mixtures. The results demonstrated that with increasing temperature, free radical scavenging increased in the presence of sage, while it decreased in the presence of hawthorn. The highest free radical scavenging percentages at temperatures ranging from ambient to body and fever are related to sage at 25˚C, and then walnut leaves at 37˚C and finally, hawthorn at 40˚C.Recommended applications/industries: The results indicated that for preventing herb-herb interactions, medicinal plants as tea, food and fruit are used alone. پرونده مقاله

Reactions of free radicals and reactive oxygen species (ROS) with biological molecules in vivo play an important physiological role in many diseases. 2,2-diphenyl-1-picrylhydrazyl (DPPH) is a stable free radical and often used as a routine reagent to evaluate the antioxidant capacity of an antioxidant. This study was undertaken to investigate the free radical-scavenging and antioxidant activities of Zinc, Vitamin C and mixture of them. UV-Vis spectrophotometry method was used to evaluate the ability of Zinc, Vitamin C and mixture of them to scavenge DPPH radical. The kinetic parameters such as rate constant and activation energy in experimental conditions were calculated. The rate constants of the H atom abstraction by DPPH (), in the presence of Zinc, Vitamin C and mixture of them were obtained (0.4209, 2.092 and 1.82 min-1) respectively, under pseudo-first-order conditions at 25 oC. پرونده مقاله

In this study, the potential of biosorbent obtained from silk maze, was investigated for the batch biosorption of Direct red 81 (DR 81) in aqueous solution. The effects of temperature, biosorbent amount, contact time, initial dye concentration and ultrasonic irradiation were also evaluated. Furthermore, experimental equilibrium and kinetics data were fitted by Langmuir and Freundlich isotherms and pseudo-first-order and pseudo-second-order kinetic models, respectively. Kinetic experiments revealed that the biosorption of DR 81 onto modified silk maze can be described with a pseudo second-order model while the equilibrium isotherm data were well described by the Freundlich model. The negative thermodynamic values of ΔHoand ΔGoshowed that the biosorption is an endothermic process and occurs spontaneously in the nature.The results presented that this waste material may be a suitable biosorbent for removal of industrial effluents due to its low cost and high efficiency. پرونده مقاله