فهرست مقالات Rate constant

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  1 - Preliminary Studies on Antioxidative Potentials of Extracts of Defatted Locust Bean Condiment
  B. Daramola
  Preliminary investigation on antioxidative potentials of defatted fermented locust bean extract in comparison to defatted non-fermented locust bean was conducted. Qualitative antioxidative assessment on the extract was accomplished by screening the phytochemical endowme چکیده کامل

  Preliminary investigation on antioxidative potentials of defatted fermented locust bean extract in comparison to defatted non-fermented locust bean was conducted. Qualitative antioxidative assessment on the extract was accomplished by screening the phytochemical endowment, and similar bioactive components. Also some antioxidative indices were quantitatively evaluated. Results showed that the defatted fermented samples were characterized with high amount of phytochemical and bioactive compounds notably phenolic compounds, saponins, peptides, amino acid and reductones. However, alkaloids and flavonoids were not detected. UV-Spectral characteristics of the extracts corroborated same. Similarly, quantitative antioxidative markers evaluated showed that the antioxidative capacity in terms of relative reducing power, total phenolic content and DPPH of fermented locust bean of defatted fermented locust bean extract were higher than the antioxidative capacity of the corresponding defatted non-fermented locust bean extract. Also, the antioxidant activity rate content, and EC50 of the extract were evaluated. This study demonstrated the antioxidant endowment of fermented locust bean condiment in comparison to non-fermented locust bean condiment. پرونده مقاله
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  2 - Study of Antioxidant and Free Radical Scavenging Activities of Cotoneaster medicus and Glycyrrhiza glabra Plants
  M. M. Heravi S. Rodi P. Ardalan
  10.22034/jchr.2018.544027
  Extracts of Cotoneaster medicus, Glycyrrhiza glabra, as endemic plants of Iran, along with mixture of them were investigated for their antioxidant activities using 2, 2- diphenyl-1-picrylhidrazyl (DPPH) reagent. UV-Vis spectrophotometry method was used to evaluate the a چکیده کامل

  Extracts of Cotoneaster medicus, Glycyrrhiza glabra, as endemic plants of Iran, along with mixture of them were investigated for their antioxidant activities using 2, 2- diphenyl-1-picrylhidrazyl (DPPH) reagent. UV-Vis spectrophotometry method was used to evaluate the ability of Cotoneaster and Glycyrrhiza glabra antioxidant 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 (k1), in the presence of C. medicus and G. glabra antioxidant were obtained under pseudo-first-order conditions at different temperatures. The order in DPPH radical-scavenging was: mixture of C. medicus and G. glabra > C. medicus > G.  glabra plants. The numerical values of activation energy were found to be 45.84 kJ.mol-1for G. glabra and 62.02kJ.mol-1 for C. medicus. پرونده مقاله