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<p>This study investigates the phytochemical composition and antioxidant activity of medicinal plants growing in three geothermal areas of the Seulawah Agam Mountains in Aceh Province, Indonesia: Ie-Brôuk, Ie-Jue, and Ie-Seu’um. A total of fifteen plant species from ten families were evaluated. Phytochemical screening revealed that tannins are the most ubiquitous secondary metabolites, suggesting their key role in plant adaptation to geothermal environments. The antioxidant activity was assessed using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay, with IC₅₀ values determined from dose–response curves and linear regression models. The three most active species based on DPPH-scavenging activity were <i>Streblus asper</i> (34.80&#xa0;ppm), <i>Antidesma montanum</i> (35.21&#xa0;ppm), and <i>Tephrosia noctiflora</i> (43.77&#xa0;ppm). Among the areas, Ie-Jue showed the highest overall effectiveness, followed by Ie-Seu’um and Ie-Brôuk, with corresponding R<sup>2</sup> values of 0.990, 0.942, and 0.750, indicating strong model fit. These results suggest that&#xa0;DPPH-based dose–response curves provide a reliable measure&#xa0;of antioxidant potential in geothermal-adapted medicinal plants.</p>

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Phytochemical composition and antioxidant activity of medicinal plants from three geothermal areas of Aceh Province, Indonesia

  • 期刊论文

  • 发表日期：

    2025年6月27日

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  • Nur Balqis Maulydia,
  • Khairan Khairan,
  • Trina Ekawati Tallei,
  • Rinaldi Idroes

摘要

This study investigates the phytochemical composition and antioxidant activity of medicinal plants growing in three geothermal areas of the Seulawah Agam Mountains in Aceh Province, Indonesia: Ie-Brôuk, Ie-Jue, and Ie-Seu’um. A total of fifteen plant species from ten families were evaluated. Phytochemical screening revealed that tannins are the most ubiquitous secondary metabolites, suggesting their key role in plant adaptation to geothermal environments. The antioxidant activity was assessed using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay, with IC₅₀ values determined from dose–response curves and linear regression models. The three most active species based on DPPH-scavenging activity were Streblus asper (34.80 ppm), Antidesma montanum (35.21 ppm), and Tephrosia noctiflora (43.77 ppm). Among the areas, Ie-Jue showed the highest overall effectiveness, followed by Ie-Seu’um and Ie-Brôuk, with corresponding R2 values of 0.990, 0.942, and 0.750, indicating strong model fit. These results suggest that DPPH-based dose–response curves provide a reliable measure of antioxidant potential in geothermal-adapted medicinal plants.