Abstract The green synthesis of silver nanoparticles (AgNPs) using an aqueous extract of different parts of the Morinda citrifolia (noni, EM) plant, such as fresh leaves (EML), fruit pulp (EMF) and dried seeds (EMDS), is reported for the first time in this research work. The AgNPs synthesized with EM were characterized spectroscopically and microscopically, to determine its morphology, size, and polydispersity. The nanoparticles (NPs) were obtained with spherical morphology and did not present agglomeration. The AgNPs synthesized with EMDS (AgNPs/EMDS) had the smallest size (3 nm), while those synthesized with EML (AgNPs/EML) had the biggest size (11 nm). Also, it was performed a study of the variation of the metallic precursor concentration and the amount of fresh fruit (F) or dried seeds (DS), in the EM to determine its effect on the morphology, size, and polydispersity of the synthesized NPs. On the other hand, the bactericidal effectiveness of the synthesized NPs was evaluated against strains like E. coli and S. aureus. The greater bactericidal activity was obtained using AgNPs/EMDS against both strains; whereas a lower bactericidal efficiency was for AgNPs/EML, the aforementioned was due to the difference in the size of both AgNPs.

中文翻译：

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海巴戟不同部位对银纳米粒子绿色合成及其抗菌活性的影响研究

摘要 使用海巴戟 (noni, EM) 植物不同部位如鲜叶 (EML)、果肉 (EMF) 和干种子 (EMDS) 的水提取物绿色合成银纳米粒子 (AgNPs)。在这项研究工作中是第一次。用 EM 合成的 AgNPs 进行了光谱和显微镜表征，以确定其形态、尺寸和多分散性。获得的纳米颗粒 (NPs) 具有球形形态并且没有团聚。用 EMDS (AgNPs/EMDS) 合成的 AgNPs 的尺寸最小 (3 nm)，而用 EML 合成的 AgNPs (AgNPs/EML) 的尺寸最大 (11 nm)。此外，还对 EM 中金属前体浓度的变化和新鲜水果 (F) 或干种子 (DS) 的数量进行了研究，以确定其对形态的影响，合成的纳米颗粒的大小和多分散性。另一方面，对合成的 NPs 对大肠杆菌和金黄色葡萄球菌等菌株的杀菌效果进行了评估。使用 AgNPs/EMDS 获得了对两种菌株的更大杀菌活性；虽然 AgNPs/EML 的杀菌效率较低，但上述原因是由于两种 AgNPs 的大小不同。