Antibacterial and Antioxidant Properties of Colorant Extracted from Red Onion Skin

Journal of Chemical Health Risks

مقاله 6، دوره 9، شماره 3، آذر 2019، صفحه 235-243   

نوع مقاله: Original Article

شناسه دیجیتال (DOI): 10.22034/jchr.2019.668188

نویسندگان

Sara Moosazad¹؛ Peyman Ghajarbeigi²؛ Razzagh Mahmoudi^{* 3}؛ Saeed Shahsavari⁴؛ Roghayeh Vahidi⁵؛ Ali Soltani⁶

¹MSc Student of Food safety and Hygiene, Faculty of public Health, Qazvin University of Medical Sciences, Qazvin, Iran

²Health products safety research Center, Qazvin University of Medical sciences, Qazvin, Iran

³Professor, Medical Microbiology Research Center, Qazvin University of Medical Sciences, Qazvin, Iran

⁴Instructor of Biostatistics, Social Determinants of Health Research Center, Qazvin University of Medical Sciences, Qazvin, Iran

⁵Msc of Food Industrial Engineering, Food Quality Control Laboratory, Qazvin University of Medical Sciences, Qazvin, Iran

⁶Msc of Organic Chemistry, Food Quality Control Laboratory, Qazvin University of Medical Sciences, Qazvin, Iran

چکیده

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.

کلیدواژه‌ها

Red onion Skin؛ Natural Colorant؛ Antioxidant؛ Antibiotics؛ Antimicrobial

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