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<p>This study utilized non-targeted metabolomics to analyze the phenolic compounds extracted from red-skinned sweet potato peels using water, ethanol, and ethanol with 2% vitamin C (Vc + 2% ethanol). The results revealed that the total phenolic content of the polyphenol extract obtained using the ethanol extraction method was significantly greater than that obtained using the other methods (365.99 ± 0.26&#xa0;mg GAE/mL with 65% ethanol, v/v, <i>p</i> &lt; 0.05). Antioxidant activity analysis (DPPH and ABTS free radical scavenging assays) also demonstrated the superior performance of ethanol extraction (<i>p</i> &lt; 0.05). In antimicrobial tests, ethanol extraction exhibited superior inhibitory effects against <i>Staphylococcus aureus</i> and <i>Bacillus subtilis</i>. LC-MS analysis revealed 401 phenolic compounds, with phenolic acids (39.90%) and flavonoids being the predominant ones (28.62%–37.80%), and phenolic acids as the most abundant (64.68%) in the ethanol extract. Thus, ethanol extraction was considered the optimal method for obtaining phenolic compounds from red-skinned sweet potato peels, providing a scientific basis for the high-value utilization of these compounds.</p> Graphical Abstract <p></p>

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Extraction methods for obtaining phenolic compounds from red-skinned sweet potato peels: a comparative study based on non-targeted metabolomics technology

  • 期刊论文

  • 发表日期：

    2025年11月27日

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  • Zhenlin Zhang,
  • Zhichao Yin,
  • Xin Yao,
  • Weiwei Cheng,
  • Meihua Hu,
  • Yixuan Zhu

摘要

This study utilized non-targeted metabolomics to analyze the phenolic compounds extracted from red-skinned sweet potato peels using water, ethanol, and ethanol with 2% vitamin C (Vc + 2% ethanol). The results revealed that the total phenolic content of the polyphenol extract obtained using the ethanol extraction method was significantly greater than that obtained using the other methods (365.99 ± 0.26 mg GAE/mL with 65% ethanol, v/v, p < 0.05). Antioxidant activity analysis (DPPH and ABTS free radical scavenging assays) also demonstrated the superior performance of ethanol extraction (p < 0.05). In antimicrobial tests, ethanol extraction exhibited superior inhibitory effects against Staphylococcus aureus and Bacillus subtilis. LC-MS analysis revealed 401 phenolic compounds, with phenolic acids (39.90%) and flavonoids being the predominant ones (28.62%–37.80%), and phenolic acids as the most abundant (64.68%) in the ethanol extract. Thus, ethanol extraction was considered the optimal method for obtaining phenolic compounds from red-skinned sweet potato peels, providing a scientific basis for the high-value utilization of these compounds.

Graphical Abstract