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<p>Collected and authenticated leaf of <i>Kalanchoe petitiana A.Rich</i> was successfully soaked with deionized water for 20&#xa0;min, and sufficient yields were obtained. Yellowish Zinc oxide nanoparticles were produced using leaf extracts of <i>K. petitiana</i> in different pH conditions through calcination at 450 degrees Celsius. The obtained ZnO nanoparticles were characterized using a UV-Vis spectrophotometer and shown to have an absorbance wavelength range of 357 to 366&#xa0;nm, with a different bandgap energy calculated at 3.25 to 3.35&#xa0;eV. The FT-IR spectrophotometer revealed that the leaf extracts of <i>K. petitiana</i> contained potential functional groups and that ZnO nanoparticles were also present in significant amounts. Importantly, the obtained ZnO nanoparticle using higher pH conditions showed higher radical scavenging efficiency against the DPPH solution. The size and crystalline nature of the ZnO nanoparticles obtained from <i>K. petitiana</i> leaf extracts at varying pH values were verified by XRD, and the nanoparticles’ size changed as the pH changed. The most significant finding was that the ZnO nanoparticles generated at a pH of 12 had a crystal size of over 21&#xa0;nm, but the synthesized ZnO nanoparticles at a pH of 8 using <i>K. petitiana</i> leaf extracts had a crystal size of less than 15&#xa0;nm. Most significantly, the ZnO nanoparticles generated at pH 8 exhibited a greater zone of inhibition against all bacterial strains than those synthesized at pH 10 and 12 using leaf extracts from Kalanchoe petitiana. Overall, the produced ZnO nanoparticles using <i>K. petitiana</i> leaf extracts at different pH values showed a stronger antibacterial zone of inhibition and increased vulnerability to gram-positive bacteria compared to gram-negative bacterial strains.</p>

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Green Synthesis of pH responsive ZnO nanoparticles using leaf extracts of Kalanchoe petitiana for effective treatment of selected antibacterial strains

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月3日

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  • Getenet Tesfa Dagne,
  • Esubalew Meku Godie,
  • Anchinesh Meselu Gelaw,
  • Abere Habtamu Manayia

摘要

Collected and authenticated leaf of Kalanchoe petitiana A.Rich was successfully soaked with deionized water for 20 min, and sufficient yields were obtained. Yellowish Zinc oxide nanoparticles were produced using leaf extracts of K. petitiana in different pH conditions through calcination at 450 degrees Celsius. The obtained ZnO nanoparticles were characterized using a UV-Vis spectrophotometer and shown to have an absorbance wavelength range of 357 to 366 nm, with a different bandgap energy calculated at 3.25 to 3.35 eV. The FT-IR spectrophotometer revealed that the leaf extracts of K. petitiana contained potential functional groups and that ZnO nanoparticles were also present in significant amounts. Importantly, the obtained ZnO nanoparticle using higher pH conditions showed higher radical scavenging efficiency against the DPPH solution. The size and crystalline nature of the ZnO nanoparticles obtained from K. petitiana leaf extracts at varying pH values were verified by XRD, and the nanoparticles’ size changed as the pH changed. The most significant finding was that the ZnO nanoparticles generated at a pH of 12 had a crystal size of over 21 nm, but the synthesized ZnO nanoparticles at a pH of 8 using K. petitiana leaf extracts had a crystal size of less than 15 nm. Most significantly, the ZnO nanoparticles generated at pH 8 exhibited a greater zone of inhibition against all bacterial strains than those synthesized at pH 10 and 12 using leaf extracts from Kalanchoe petitiana. Overall, the produced ZnO nanoparticles using K. petitiana leaf extracts at different pH values showed a stronger antibacterial zone of inhibition and increased vulnerability to gram-positive bacteria compared to gram-negative bacterial strains.