فهرس المقالات Red onion Skin

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  1 - Sequential Solvent Extraction of Red-Onion (Allium cepa L) Skin: Influence of Solvent Polarity on Antioxidant and Radical Scavenging Activity
  S. Mahdian Kouchaksarayi S.M. Vahdat M. Hejazi M. Khavarpour Z. Salimi
  The present study was performed to evaluate the influence of solvent polarity on antioxidant and radical scavenging activity of the extracts of red onion skin. Extracts were obtained using sequential extraction method with various solvents namely ethyl acetate, n-butano أکثر

  The present study was performed to evaluate the influence of solvent polarity on antioxidant and radical scavenging activity of the extracts of red onion skin. Extracts were obtained using sequential extraction method with various solvents namely ethyl acetate, n-butanol, methanol and water. Ethyl acetate and n-butanol extracts demonstrated the highest total phenolic (577.310±9.2 and 441.379±7.3 mg GAE/g extract, respectively) and flavonoids contents (36.188±5.1 and 33.844±4.6 mg QE/g extract, respectively), as well asthe highest antioxidant capacity compared to methanolic and waterextracts through all antioxidant assays.The results showed that all extracts exhibited antioxidant activity in a concentration-dependent manner. Significant correlation was obtained between antioxidant activities and total flavonoids.The highest DPPH and nitric oxide radical scavenging were acquired for n-butanol extract.Furthermore, ethyl acetate extract displayed the most reducing power.The results indicated that the components with antioxidant properties in onion skin were extracted in non-polar solvents more than polar solvents. تفاصيل المقالة
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  2 - Antibacterial and Antioxidant Properties of Colorant Extracted from Red Onion Skin
  Sara Moosazad Peyman Ghajarbeigi Razzagh Mahmoudi Saeed Shahsavari Roghayeh Vahidi Ali Soltani
  10.22034/jchr.2019.668188
  Due to the abundance and cheapness of red onion skin scrubs and its high consumption in Iran, we decided to evaluate its antioxidant and antimicrobial properties as a natural source of anthocyanin. The onion skin was collected from the Qazvin local market. Extraction wa أکثر

  Due to the abundance and cheapness of red onion skin scrubs and its high consumption in Iran, we decided to evaluate its antioxidant and antimicrobial properties as a natural source of anthocyanin. The onion skin was collected from the Qazvin local market. Extraction was carried out using water and glycerol. The total anthocyanin concentration was determined by pH-differential method. MICand MBC were determined using microdilution method and diameter of the bacteria inhibition zone by disc diffusion method on extracted color from Onion skin against Staphylococcus aureus and Escherichia coli strains. The antioxidant activity was determined by measuring the 2,2-diphenyl-1-picrylhydrazyl(DPPH) and total phenol content by the Folin Ciocalteu. The mean total anthocyanin concentration at 40°C was (60.67, 8.4) mg/g. The highest and the lowest mean diameter of the non-growth zones of the extracted colorant in Staphylococcus aureus was 0/83±0/14 and 0/4±0/17 and in the E. coli 0/9±0/22 and 0/5±0/20 respectively. Inhibitory concentration of 50% (IC50) in the extracted colorant was obtained at 14/718±0/20 mg / ml. The total phenolic content was obtained as an average of 114.326±2/36 mg/g of gallic acid per gram of onion powder. According to the results of the study and the high consumption of onions in various types of household foods and as a result of increasing their waste, antioxidant and antimicrobial properties, in addition to coloring, can be used as a cheap dye source in various food industries. تفاصيل المقالة