The present research work explores an environmental benign, lucrative approach for the synthesis of cauliflower-like Ag/MgO nanocomposite using Musa paradisiaca bract extract (MPBE) with multifunctional efficiency towards antibacterial, anticancer, and catalytic degradation towards methylene blue (MB), methyl orange (MO), and O-nitrophenol (O-Nip). The UV–visible absorption spectra of the synthesized Ag/MgO nanocomposite exhibit absorption peak at 270 nm and 410 nm, respectively. Fourier transform infrared spectroscopy was used to probe the functional biomolecules responsible for the reduction of Ag/MgO nanocomposite. The X-ray diffraction spectroscopy and the surface morphological images revealed the successful formation of cauliflower-like Ag/MgO nanocomposite. The fabricated nanocomposite exhibited potent antibacterial and anticancer activity for human pathogenic organisms Escherichia coli and Staphylococcus aureus with zone of inhibition 15 mm and 14 mm and showed IC₅₀ value of 190 μg/ml against A549 cells. Apoptosis assay (AO/EB staining) was carried out, and the obtained results showed that bright green fluorescence indicates early apoptosis, red to orange fluorescence indicates late apoptosis, and red fluorescence denotes necrosis. Also the synthesized Ag/MgO nanocomposite exhibits enhanced catalytic degradation of 91%, 95%, and 98% in 6 min, 9 min, and 10 min for MB, MO, and O-Nip. Hence, this study highlights the use of MPBE for effective fabrication of cauliflower-like Ag/MgO nanocomposite with multifaceted application that acts as a potential candidate to resolve the diverse problems.

本研究工作探索了一种环境友好，有利可图的方法，可利用天堂芭蕉（Musa paradisiaca）合成花椰菜状Ag / MgO纳米复合材料提取物（MPBE）具有对抗菌，抗癌和催化降解亚甲基蓝（MB），甲基橙（MO）和O-硝基苯酚（O-Nip）的多功能功效。合成的Ag / MgO纳米复合材料的紫外-可见吸收光谱分别在270 nm和410 nm处显示吸收峰。傅里叶变换红外光谱用于探测负责减少Ag / MgO纳米复合材料的功能性生物分子。X射线衍射光谱和表面形貌图像表明成功形成了花椰菜状的Ag / MgO纳米复合材料。制备的纳米复合材料对人类病原性大肠杆菌和金黄色葡萄球菌具有强大的抗菌和抗癌活性。抑制区域分别为15 mm和14 mm，对A549细胞的IC ₅₀值为190μg/ ml。进行细胞凋亡测定（AO / EB染色），结果显示亮绿色荧光表示早期凋亡，红色至橙色荧光表示晚期凋亡，红色荧光表示坏死。同样，对于MB，MO和O-Nip，合成的Ag / MgO纳米复合材料在6分钟，9分钟和10分钟内显示出91％，95％和98％的增强催化降解。因此，本研究强调了MPBE在多方面应用中有效制造菜花状Ag / MgO纳米复合材料的应用，该复合材料可作为解决各种问题的潜在候选者。