Department of Food Science and Technology, Faculty of Agriculture, Urmia University, Urmia, P.O. Box 57561-51818, Iran.
Department of Food Science and Technology, Faculty of Agriculture, Urmia University, Urmia, P.O. Box 57561-51818, Iran.
Int J Biol Macromol. 2019 May 1;128:848-857. doi: 10.1016/j.ijbiomac.2019.02.007. Epub 2019 Feb 4.
MgO-bacterial cellulose (BC) nanohybrids were fabricated by in-situ synthesis of nanoparticles (NPs) within BC network via two methods (the sonochemical and wet chemical). The ex-situ synthesized nanohybrid was prepared by immersing BC pellicles in the commercial MgO dispersion. The occurrence of new interactions between MgO-NPs and nanofibers was approved by Fourier transform infrared spectroscopy (FT-IR) spectra. X-ray diffraction (XRD) results indicated that the crystallinity index of nanofibers decreased after the formation of nanohybrid by the sonochemical in-situ method. The results of the field emission scanning electron microscopy (FE-SEM) indicated the formation of the small-sized NPs attached to the inner space of BC network at the in-situ synthesized nanohybrids. However, the agglomerated NPs precipitated on the surface of BC layer were observed for the ex-situ synthesized sample. The loading capacity of the ex-situ method was higher than that of the in-situ methods; but after 24 h, MgO releasing for in-situ and ex-situ synthesized nanohybrids was recorded about 16% and 28%, respectively. The antibacterial activity of the ex-situ synthesized nanohybrid against S. aureus and E. coli bacteria was more than those of both in-situ synthesized samples.
MgO-细菌纤维素（BC）纳米复合材料是通过两种方法（超声化学法和湿法）在 BC 网络内原位合成纳米颗粒（NPs）制备的。将 BC 薄膜浸入商业 MgO 分散体中，制备了体外合成的纳米复合材料。傅里叶变换红外光谱（FT-IR）光谱证实了 MgO-NPs 和纳米纤维之间新相互作用的发生。X 射线衍射（XRD）结果表明，通过超声化学原位法形成纳米复合材料后，纳米纤维的结晶度指数降低。场发射扫描电子显微镜（FE-SEM）的结果表明，在原位合成的纳米复合材料中，形成了附着在 BC 网络内部空间的小尺寸 NPs。然而，对于体外合成的样品，观察到了团聚的 NPs 沉淀在 BC 层的表面上。体外法的负载能力高于原位法；但是，在 24 小时后，原位和体外合成的纳米复合材料释放的 MgO 分别约为 16%和 28%。体外合成的纳米复合材料对金黄色葡萄球菌和大肠杆菌的抗菌活性均高于两种原位合成样品。
