List of Articles Antioxidant property

• Open Access Article
  • Abstract Page
  • Full-Text
  
  1 - Evaluation of the Antioxidant Activities of Roasted and Unroasted Coffee Extracts
  Sahar Khorsand Manesh Mehrada Ghavami Behzad Bazyar
  Introduction: Oxidation is one of the most important spoiling reaction in the oils and fats and might be delayed by the use of antioxidants to some extent. Coffee contains some effective phenolic antioxidants such as chlorogenic acids, caffeic acids ester and quinnic ac More

  Introduction: Oxidation is one of the most important spoiling reaction in the oils and fats and might be delayed by the use of antioxidants to some extent. Coffee contains some effective phenolic antioxidants such as chlorogenic acids, caffeic acids ester and quinnic acids. The object of this research is to study the antioxidant activities of coffee extracts. Materials and Methods: In this research work coffee extracts were obtained by hexane and isopropanol after three hours of extraction period. The extracts yields and total phenolic compounds were determined using Folin ciocalteu method. The hexanolic and isoporopanolic extracts of both roasted and unroasted coffee from two varieties of coffee (Arabica, Robusta) were added to tallow at different concentrations. Peroxide value at 100UC (oven) and Induction period measurements at 110UC (Rancimat) were used as means to examine and investigate the antioxidant activities of the above extracts. Results: The results indicated that coffee extracts inhibited antioxidant activities and were able to reduce the oxidation chain reaction. The highest yield of phenolic compounds, taking Gallic acid as the index was related to the extracts obtained by isopropanol and accounted for 2.17 mg/g of dry matter. This might be due to higher polarity of isopropanol as compared to hexane. Conclusion: Among the extracts isopropanolic extract of roasted Robusta with 15% concentration exhibited the best antioxidant activity. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  2 - بررسی خاصیت آنتی اکسیدانی ‌‌عصاره‌‌ های اتانولی، پروپیلن گلایکولی و گلیسرولی گیاه Helichrysum oocephalum Boiss
  عالمه سرایانی ندا امینی
  Harmful chemicals, exposure to various types of radiation, and lifestyle changes have disrupted the oxidative balance in the body, as a result of which the amount of free radicals has increased, and this increase has a direct role in causing various diseases such as can More

  Harmful chemicals, exposure to various types of radiation, and lifestyle changes have disrupted the oxidative balance in the body, as a result of which the amount of free radicals has increased, and this increase has a direct role in causing various diseases such as cancer. Therefore, it is very necessary to identify compounds with antioxidant properties, since plants are rich in antioxidant compounds and are available to people, so the present study was conducted with the aim of investigating the antioxidant properties of Helichrysum oocephalum Boiss plant extract. In this research, after collecting the plant, its aerial parts and roots were powdered, then extraction was done by maceration method. For this purpose, three different solvents (propylene glycol, ethanol and glycerol) were used and the concentrations were 2.5, 5, 10, 20 and 40 mg/ml were obtained from propylene glycol, ethanol and glycerol extracts. Finally, the antioxidant properties of the extracts were measured using the DPPH test. Using the IC50 test, the concentration of the extract, which has antioxidant properties, was obtained. The results showed that the propylene glycol extract of the plant at a concentration of 40 mg/ml has the highest antioxidant properties, while the glycerol and ethanol extracts were ranked next. Statistical analysis also showed a significant difference (P<0.05). Also, the IC50 value for propylene glycol extract is equal to 12.40, which shows the high antioxidant power of the desired extract compared to the control, and the ethanol and glycerol extracts are after the propylene glycol extract, respectively. It seems that the propylene glycol extract of the plant at a concentration of 40 mg/ml can be used as an antioxidant compound in various industries including pharmaceuticals. Manuscript profile