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Flavonoids and Antioxidant Capacity of Georgia-Grown Vidalia Onions
Abstract
Vidalia onion varieties Nirvana, DPS 1032, Yellow 2025, King-Midas, and SBO 133 grown at Vidalia, Georgia, were analyzed for flavonoid content. A high-performance liquid chromatographic (HPLC) method with photodiode array detection was used for quantification. Compounds were analyzed as aglycons after acid hydrolysis with 1.2 M HCl. Identification of each compound was based on comparison of its retention time and UV spectra with those of pure commercial standards. Three major flavonoids, kaempferol, myricetin, and quercetin, were identified and quantified. Quercetin was the major flavonoid (7.70-46.32 mg/100 g fresh weight, FW) present in all varieties, followed by myricetin (2.77-4.13 mg/100 g FW). Minor quantities of kaempferol (1.10-1.98 mg/100 g FW) were also detected. The total polyphenols and Trolox equivalent antioxidant capacity (TEAC) ranged from 73.33 to 180.84 mg/100 g FW and 0.92-1.56 microM TEAC/g FW, respectively. A positive but weaker correlation was obtained for total polyphenols versus antioxidant capacity. Nevertheless, a stronger correlation (r(2) = 0.34) was obtained between flavonoid content versus antioxidant capacity. The data indicate that Vidalia onions are a rich source of quercetin, and they also contain myricetin and kaempferol.
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Colorimetry of Total Phenolics with Phosphomolybdic-Phosphotungstic Acid Reagents
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Biological properties of onions and garlic
CORZOMARTINEZ, M., CORZO, N., & VILLAMIEL, M. (2007) · Trends in Food Science & Technology · doi:10.1016/j.tifs.2007.07.011 · Cited by 810
Onions: A Source of Unique Dietary Flavonoids
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Flora, S. J. S. (2009) · Oxidative Medicine and Cellular Longevity · doi:10.4161/oxim.2.4.9112 · Cited by 616
Flavonols, Flavones, Flavanones, and Human Health: Epidemiological Evidence
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Daily Polyphenol Intake in France from Fruit and Vegetables
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Metadata
- Authors
- Sellappan, S., & Akoh, C. C.
- Venue
- Journal of Agricultural and Food Chemistry
- Publisher
- American Chemical Society (ACS)
- Published
- 2002-08-14
- Volume
- 50
- Issue
- 19
- Pages
- 5338-5342
- ISSN
- 0021-8561 (ISSN-L)
- 1520-5118
- OpenAlex
- W2083246404
- Cited by
- 221
- References
- 1
- FWCI
- 3.68
- Type
- journal article
- Language
- en
- Open access
- closed
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