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Journal of Food Science and Technology

, Volume 56, Issue 4, pp 1811–1819 | Cite as

Onion (Allium cepa L.) is potentially a good source of important antioxidants

  • Jiwan S. SidhuEmail author
  • Muslim Ali
  • Amal Al-Rashdan
  • Nissar Ahmed
Original Article

Abstract

Six different cultivars of onions available in the Kuwaiti market were analyzed for various physic-chemical properties, such as, moisture content, sugar composition, TBARS as malondialdehyde, total phenolic content, as well as trolox equivalent antioxidant capacity, these cultivars comprised of US onions white, US onions yellow, Indian onions red, Egyptian onions red, New Zealand onions golden and Saudi onions white. Layers from each onion bulb were manually cut and separated into three nearly equal portions, i.e., outer layers, middle layers and the inner layers. The outermost layers of the bulb showed the highest concentration of antioxidant compounds and a distinct decreasing trend was observed towards the innermost layers in all types of onion samples. The onion samples studied showed variations in carbohydrate contents (glucose, fructose and sucrose), which would have important implications in affecting the flavor (sweetness and pungency) and the suitability of these onions for processing. An important observation is about the distribution of antioxidant compounds with the highest contents in the outmost layers of the onions than in their middle and inner layers. Unfortunately, these outer layers are generally discarded by the consumers thus depriving them of the important health-promoting phytochemicals.

Keywords

Allium cepa Antioxidant capacity Total phenolics Sugars Free radical scavenging activity 

Notes

Acknowledgements

The authors thank the Kuwait University for financial support, Mr. Suleiman form Kuwait Institute for Scientific Research for carrying out the sugar analysis, Ms. JS Divya from the Biochemistry section, Biological Sciences Dept, Kuwait University, for carrying out the required chemical analyses of onion samples and for the statistical analyses of research data. Funding was provided by Kuwait University (Grant No. WF01/05).

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Copyright information

© Association of Food Scientists & Technologists (India) 2019

Authors and Affiliations

  • Jiwan S. Sidhu
    • 1
    Email author
  • Muslim Ali
    • 2
  • Amal Al-Rashdan
    • 3
  • Nissar Ahmed
    • 3
  1. 1.Department of Food Science and Nutrition, College of Life SciencesKuwait UniversitySafatKuwait
  2. 2.Department of Biological Sciences, Faculty of ScienceKuwait UniversitySafatKuwait
  3. 3.Kuwait Institute for Scientific ResearchSafatKuwait

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