Marine algae used as a food source for ocean life and range in color from red to green to brown grow along rocky shorelines around the world. The synthesis of silver nanoparticles by marine alga Padina sp. and its characterization were fulfilled by using UV-visible spectrophotometer, Fourier transform infrared spectroscopy, scanning electron microscopy and field emission scanning electron microscopy, and energy-dispersive X-ray spectroscopy. UV-visible absorption spectrum revealed that the formation of Ag nanoparticles was increased by the addition of marine algae and the spectral peak observed between a wavelength of ~ 420 nm and 445 nm. In addition, SEM and FESEM images examined the surface morphology and the size of the synthesized NPs was relatively uniform in size ~ 25–60 nm. Energy-dispersive X-ray spectroscopy analysis confirmed the purity of Ag NPs with atomic percentage of 48.34% Ag. The synthesized Ag NPs showed highly potent antibacterial activity. The Staphylococcus aureus and Pseudomonas aeruginosa were found to be more susceptible to silver nanoparticles by forming 15.17 ± 0.58 mm and 13.33 ± 0.76 mm of diameter of the inhibition zone, respectively. The study suggested that marine alga Padina sp. could be an alternative source for the production of Ag nanoparticles and are efficient antimicrobial compounds against both gram-negative and gram-positive bacteria which can be a promising material against infectious bacteria.

中文翻译：

---

使用海洋大型藻类 Padina sp. 合成银纳米粒子。及其对病原菌的抗菌活性

海藻用作海洋生物的食物来源，颜色从红色到绿色到棕色不等，生长在世界各地的岩石海岸线上。海藻Padina sp.合成银纳米颗粒。并通过紫外可见分光光度计、傅里叶变换红外光谱、扫描电子显微镜和场发射扫描电子显微镜以及能量色散X射线光谱仪完成了其表征。紫外可见吸收光谱表明，通过添加海藻和在 ~ 420 nm 和 445 nm 波长之间观察到的光谱峰，Ag 纳米粒子的形成增加。此外，SEM 和 FESEM 图像检查了表面形态，合成的纳米颗粒的尺寸相对均匀，约为 25-60 nm。能量色散 X 射线光谱分析证实了 Ag NPs 的纯度，Ag 的原子百分比为 48.34%。合成的Ag NPs显示出高效的抗菌活性。发现金黄色葡萄球菌和铜绿假单胞菌对银纳米粒子更敏感，分别形成直径为 15.17 ± 0.58 mm 和 13.33 ± 0.76 mm 的抑菌圈。该研究表明，海藻 Padina sp。可能是生产银纳米粒子的替代来源，并且是针对革兰氏阴性和革兰氏阳性细菌的有效抗菌化合物，这可能是一种有前途的抗感染性细菌材料。发现金黄色葡萄球菌和铜绿假单胞菌对银纳米粒子更敏感，分别形成直径为 15.17 ± 0.58 mm 和 13.33 ± 0.76 mm 的抑菌圈。该研究表明，海藻 Padina sp。可能是生产银纳米粒子的替代来源，并且是针对革兰氏阴性和革兰氏阳性细菌的有效抗菌化合物，这可能是一种有前途的抗感染性细菌材料。金黄色葡萄球菌和铜绿假单胞菌通过形成直径分别为 15.17 ± 0.58 mm 和 13.33 ± 0.76 mm 的抑菌圈，对银纳米颗粒更敏感。该研究表明，海藻 Padina sp。可能是生产银纳米颗粒的替代来源，并且是针对革兰氏阴性和革兰氏阳性细菌的有效抗菌化合物，这可能是一种有前途的抗感染性细菌材料。