Comparative Analysis of Polyphenol Content and Antioxidant Activity of Different Parts of Five Onion Cultivars Harvested in Korea

Kim, Yena; Kim, Young-Jun; Shin, Youngjae

doi:10.3390/antiox13020197

Open AccessArticle

Comparative Analysis of Polyphenol Content and Antioxidant Activity of Different Parts of Five Onion Cultivars Harvested in Korea

by

Yena Kim

¹,

Young-Jun Kim

^2,*,†

and

Youngjae Shin

^1,*,†

¹

Department of Food Engineering, Dankook University, Cheonan, Chungnam 31116, Republic of Korea

²

Department of Food Science and Biotechnology, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea

^*

Authors to whom correspondence should be addressed.

^†

These authors contributed equally to this work.

Antioxidants 2024, 13(2), 197; https://doi.org/10.3390/antiox13020197

Submission received: 3 January 2024 / Revised: 1 February 2024 / Accepted: 1 February 2024 / Published: 4 February 2024

(This article belongs to the Section Extraction and Industrial Applications of Antioxidants)

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Abstract

Onions are typically consumed as the bulb, but the peel and root are discarded as by-products during processing. This study investigated the potential functional use of these by-products by analyzing the polyphenols, antioxidant compounds, and antioxidant activity contained in onions. In this study, the bulb, peel, and root of five onion cultivars (‘Tank’, ‘Bomul’, ‘Gujji’ ‘Cobra’, and ‘Hongbanjang’) harvested in Korea were investigated. Caffeic acid and quercetin were most abundant in the peel, whereas methyl gallate was the predominant polyphenol in the bulb. Both DPPH and ABTS radical scavenging activity were higher in onion peel and root than in the bulb. These findings suggest that onion peel and roots, which are often discarded, have abundant antioxidant substances and excellent antioxidant activity. This study provides basic data for the future use of onion peel and roots as functional ingredients with high added value.

Keywords: onion; by-product; polyphenol; antioxidants; vitamin C

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MDPI and ACS Style

Kim, Y.; Kim, Y.-J.; Shin, Y. Comparative Analysis of Polyphenol Content and Antioxidant Activity of Different Parts of Five Onion Cultivars Harvested in Korea. Antioxidants 2024, 13, 197. https://doi.org/10.3390/antiox13020197

AMA Style

Kim Y, Kim Y-J, Shin Y. Comparative Analysis of Polyphenol Content and Antioxidant Activity of Different Parts of Five Onion Cultivars Harvested in Korea. Antioxidants. 2024; 13(2):197. https://doi.org/10.3390/antiox13020197

Chicago/Turabian Style

Kim, Yena, Young-Jun Kim, and Youngjae Shin. 2024. "Comparative Analysis of Polyphenol Content and Antioxidant Activity of Different Parts of Five Onion Cultivars Harvested in Korea" Antioxidants 13, no. 2: 197. https://doi.org/10.3390/antiox13020197

APA Style

Kim, Y., Kim, Y.-J., & Shin, Y. (2024). Comparative Analysis of Polyphenol Content and Antioxidant Activity of Different Parts of Five Onion Cultivars Harvested in Korea. Antioxidants, 13(2), 197. https://doi.org/10.3390/antiox13020197

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

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Comparative Analysis of Polyphenol Content and Antioxidant Activity of Different Parts of Five Onion Cultivars Harvested in Korea

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