Antibacterial and Antioxidant Properties of Colorant Extracted from Red Onion Skin
الموضوعات :
Sara Moosazad
1
(MSc Student of Food safety and Hygiene, Faculty of public Health, Qazvin University of Medical Sciences, Qazvin, Iran)
Peyman Ghajarbeigi
2
(Health products safety research Center, Qazvin University of Medical sciences, Qazvin, Iran)
Razzagh Mahmoudi
3
(Professor, Medical Microbiology Research Center, Qazvin University of Medical Sciences, Qazvin, Iran)
Saeed Shahsavari
4
(Instructor of Biostatistics, Social Determinants of Health Research Center, Qazvin University of Medical Sciences, Qazvin, Iran)
Roghayeh Vahidi
5
(Msc of Food Industrial Engineering, Food Quality Control Laboratory, Qazvin University of Medical Sciences, Qazvin, Iran)
Ali Soltani
6
(Msc of Organic Chemistry, Food Quality Control Laboratory, Qazvin University of Medical Sciences, Qazvin, Iran)
الکلمات المفتاحية: Antioxidant, Antimicrobial, Antibiotics, Red onion Skin, Natural Colorant,
ملخص المقالة :
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.
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