Scholarlink

<p>Eucalyptus leaf extracts, rich in bioactive components, are increasingly attracting interest due to their diverse health benefits. This work explored the allelopathic and antioxidant properties of methanolic aqueous and ethyl acetate leaf extracts of <i>Eucalyptus torquata</i> Luehm and <i>Eucalyptus campaspe</i> S. Moor. In comparison with water and ethyl acetate, methanol at 80% yielded the highest concentrations of total phenols (214.5 and 280.3&#xa0;mg GAE/g DW), flavonoids (109.5 and 113.12&#xa0;mg QE/g DW), and condensed tannins (17.5 and 21.3&#xa0;mg CE/g DW) from <i>E. torquata</i> and <i>E. campaspe</i> extracts, respectively. The methanolic leaf extracts of <i>E. torquata</i> and <i>E. campaspe</i> showed the highest antioxidant activities with IC<sub>50</sub> values of 5.46 and 4.84&#xa0;µg/mL for DPPH radical and 10.08 and 12.78&#xa0;µg/mL for ABTS+. The strong antioxidant activity is likely attributable to the high phenolic content. Through LC-MS analysis, thirteen phenolic compounds, two monoterpenoid esters (cypellocarpin B and C), and two phloroglucinol-terpenes derivatives (eucalyptal and macrocarpal) were monitored in the methanolic leaf extracts of <i>E. torquata</i> and <i>E. campaspe</i>. Among them, caffeoyl hexose, ellagic acid derivative, and to a lesser extent quinic acid and gallic acid were acknowledged for their antioxidant activities. However, methanolic leaf extracts of <i>E. torquata</i> and <i>E. campaspe</i> containing the respective phenolic components (gallic acid, rutin) and (catechin, myricetin) have pronounced allelopathic activities at 20&#xa0;mg/mL. The phytotoxic effects significantly reduced seed germination and weed growth on the aerial parts and roots of plants. These results underline the potential usefulness of our eucalyptus extracts in weed management.</p> Graphical abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Liquid chromatography- mass spectrometry profiling, antioxidant and allelopathic activities of leaf extracts from Eucalyptus torquata and Eucalyptus Campaspe

  • 期刊论文

  • 发表日期：

    2026年1月5日

查看全文
  • Ferjani Dhaouadi,
  • Hela Sakka,
  • Samia Ayari,
  • Yassine Mrabet,
  • Ismail Amri,
  • Oumayma Kochti,
  • Mouldi Saidi,
  • Abdelnaceur Boulila,
  • Naceur Mejri

摘要

Eucalyptus leaf extracts, rich in bioactive components, are increasingly attracting interest due to their diverse health benefits. This work explored the allelopathic and antioxidant properties of methanolic aqueous and ethyl acetate leaf extracts of Eucalyptus torquata Luehm and Eucalyptus campaspe S. Moor. In comparison with water and ethyl acetate, methanol at 80% yielded the highest concentrations of total phenols (214.5 and 280.3 mg GAE/g DW), flavonoids (109.5 and 113.12 mg QE/g DW), and condensed tannins (17.5 and 21.3 mg CE/g DW) from E. torquata and E. campaspe extracts, respectively. The methanolic leaf extracts of E. torquata and E. campaspe showed the highest antioxidant activities with IC50 values of 5.46 and 4.84 µg/mL for DPPH radical and 10.08 and 12.78 µg/mL for ABTS+. The strong antioxidant activity is likely attributable to the high phenolic content. Through LC-MS analysis, thirteen phenolic compounds, two monoterpenoid esters (cypellocarpin B and C), and two phloroglucinol-terpenes derivatives (eucalyptal and macrocarpal) were monitored in the methanolic leaf extracts of E. torquata and E. campaspe. Among them, caffeoyl hexose, ellagic acid derivative, and to a lesser extent quinic acid and gallic acid were acknowledged for their antioxidant activities. However, methanolic leaf extracts of E. torquata and E. campaspe containing the respective phenolic components (gallic acid, rutin) and (catechin, myricetin) have pronounced allelopathic activities at 20 mg/mL. The phytotoxic effects significantly reduced seed germination and weed growth on the aerial parts and roots of plants. These results underline the potential usefulness of our eucalyptus extracts in weed management.

Graphical abstract