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KMID : 1134820230520080821
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Journal of the Korean Society of Food Science and Nutrition
2023 Volume.52 No. 8 p.821 ~ p.829
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UPLC-Orbitrap-MS/MS Analysis of Polyphenolic Compounds from Ethanol Extracts of Peanut Skin and Their Antioxidant Activities
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Ha Tae-Joung
Hwang Um-Ji
Oh Eun-Young
Lee Myoung-Hee
Kim Jung-In
Park You-Jin
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Abstract
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The kernels of peanut (Arachis hypogaea L.) are undoubtedly the most important product of this plant. However, peanut skins (PS) are often overlooked in terms of their nutraceutical potential. PS contain polyphenolic compounds that have significant health benefits. This study sought to investigate the polyphenol compounds in the three different colored varieties of PS (Heuksaeng: black, Sewon: dark red, and Daan: light brown) using ultra-performance liquid chromatography with orbitrap mass (UPLC-Orbitrap-MS) analysis. Twenty-one proanthocyanins (PAC), nineteen flavonoids, two anthocyanins, and two flavans were identified in the ethanol extracts of PS. The individual and total phenolic contents were remarkably different, especially catechin and PAC, which were the predominant compounds in all the PS varieties. The Daan PS exhibited the highest total phenolic content (198.0±2.7 mg GAE/g) and antioxidant activity, whereas the Sewon PS showed the lowest total phenolic content (59.8±1.6 mg GAE/g). Therefore, our results indicate that high PAC and flavonoid content determine the antioxidant effects of PS.
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KEYWORD
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peanut skin, polyphenols, UPLC-MS, antioxidant, proanthocyanidin
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