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<p>Arctic plants represent an emerging novel source of antioxidants owing to their adaptation to extreme environments. This study investigated the phytochemical composition and radical scavenging properties of <i>Oxyria digyna</i>, an Arctic plant traditionally consumed for its nutritional benefits. The ethanolic extract showed high total polyphenol (50.3&#xa0;mg tannic acid equivalent/g extract) and flavonoid (29.3&#xa0;mg quercetin equivalent/g extract) concentrations, with significant IC<sub>50</sub> values demonstrated in the 2,2-diphenyl-1-picrylhydrazyl (0.85&#xa0;mg/mL) and 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (0.71&#xa0;mg/mL) assays for radical scavenging activity. The extract was analyzed using liquid chromatography–tandem mass spectrometry and high-performance liquid chromatography. A total of 33 phytochemicals were identified, of which 11 flavonoids were quantified, including schaftoside (<b>1</b>), isoorientin (<b>2</b>), myricetin 3-<i>O</i>-galactoside (<b>3</b>), orientin (<b>4</b>), rutin (<b>5</b>), isovitexin (<b>6</b>), isorhamnetin 3-neohesperidoside (<b>7</b>), hirsutrin (<b>8</b>), quercetin 3-<i>O</i>-malonylglucoside (<b>9</b>), quercetin 3-<i>O</i>-glucose-6''-acetate (<b>10</b>), and tiliroside (<b>11</b>). Of these, hirsutrin (<b>8</b>), rutin (<b>5</b>), and isoorientin (<b>2</b>) were the predominant constituents (19.00, 15.13, and 10.18&#xa0;mg/g, respectively). These findings support the traditional use of <i>O. digyna</i> and demonstrate its relevance in the development of health-promoting products, especially considering its resilience to the harsh Arctic conditions.</p>

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LC–MS-based identification and quantification of antioxidant flavonoids in arctic Oxyria digyna

  • 期刊论文

  • 发表日期：

    2025年10月22日

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  • Neil Patrick Uy,
  • Mira Choi,
  • Yoo Kyung Lee,
  • Kyoung-Soon Jang,
  • Sanghyun Lee

摘要

Arctic plants represent an emerging novel source of antioxidants owing to their adaptation to extreme environments. This study investigated the phytochemical composition and radical scavenging properties of Oxyria digyna, an Arctic plant traditionally consumed for its nutritional benefits. The ethanolic extract showed high total polyphenol (50.3 mg tannic acid equivalent/g extract) and flavonoid (29.3 mg quercetin equivalent/g extract) concentrations, with significant IC50 values demonstrated in the 2,2-diphenyl-1-picrylhydrazyl (0.85 mg/mL) and 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (0.71 mg/mL) assays for radical scavenging activity. The extract was analyzed using liquid chromatography–tandem mass spectrometry and high-performance liquid chromatography. A total of 33 phytochemicals were identified, of which 11 flavonoids were quantified, including schaftoside (1), isoorientin (2), myricetin 3-O-galactoside (3), orientin (4), rutin (5), isovitexin (6), isorhamnetin 3-neohesperidoside (7), hirsutrin (8), quercetin 3-O-malonylglucoside (9), quercetin 3-O-glucose-6''-acetate (10), and tiliroside (11). Of these, hirsutrin (8), rutin (5), and isoorientin (2) were the predominant constituents (19.00, 15.13, and 10.18 mg/g, respectively). These findings support the traditional use of O. digyna and demonstrate its relevance in the development of health-promoting products, especially considering its resilience to the harsh Arctic conditions.