Gómez-Graña Sergio, Perez-Ameneiro María, Vecino Xanel, Pastoriza-Santos Isabel, Perez-Juste Jorge, Cruz José Manuel, Moldes Ana Belén
Departamento de Química Física CINBIO, Universidade de Vigo, 36310 Vigo, Spain.
Chemical Engineering Department, School of Industrial Engineering (EEI), University of Vigo, Campus As Lagoas-Marcosende, 36310 Vigo-Pontevedra, Spain.
Nanomaterials (Basel). 2017 Jun 6;7(6):139. doi: 10.3390/nano7060139.
A new and promising biosurfactant extracted from corn steep liquor has been used for the green synthesis of gold and silver nanoparticles (NPs) in a one-step procedure induced by temperature. Most of the biosurfactants proposed in the literature are produced by pathogenic microorganisms; whereas the biosurfactant used in the current work was extracted from a liquid stream, fermented spontaneously by lactic acid bacteria, which are "generally recognized as safe" (GRAS) microorganisms. The reduction of a gold precursor in the presence of a biosurfactant gives rise to a mixture of nanospheres and nanoplates with distinct optical features. Moreover, the growth of nanoplates can be promoted by increasing the reaction temperature to 60 °C. In the case of silver, the biosurfactant just induces the formation of pseudo-spherical NPs. The biosurfactant plays a key role in the reduction of the metal precursor, as well as in the stabilization of the resulting NPs. Furthermore, the antimicrobial activity of the resulting silver colloids has been analyzed against , and . The biosurfactant stabilized NPs slightly increased the inhibition of in comparison with citrate stabilized Ag NPs. The use of this biosurfactant extracted from corn steep liquor for the synthesis of metal NPs contributes to enhancing the application of green technologies and increasing the utilization of clean, non-toxic and environmentally safe production processes. Therefore, it can help to reduce environmental impact, minimize waste and increase energy efficiency in the field of nanomaterials.
一种从玉米浆中提取的新型且有前景的生物表面活性剂已被用于通过温度诱导的一步法绿色合成金和银纳米颗粒（NPs）。文献中提出的大多数生物表面活性剂是由致病微生物产生的；而当前工作中使用的生物表面活性剂是从一种液体流中提取的，该液体流由乳酸菌自发发酵产生，乳酸菌是“一般认为安全”（GRAS）的微生物。在生物表面活性剂存在下金前驱体的还原产生了具有独特光学特征的纳米球和纳米板的混合物。此外，将反应温度提高到60°C可促进纳米板的生长。对于银，生物表面活性剂仅诱导伪球形NPs的形成。生物表面活性剂在金属前驱体的还原以及所得NPs的稳定化中起着关键作用。此外，已分析了所得银胶体对 、 和 的抗菌活性。与柠檬酸盐稳定的Ag NPs相比，生物表面活性剂稳定的NPs对 的抑制作用略有增加。使用从玉米浆中提取的这种生物表面活性剂来合成金属NPs有助于增强绿色技术的应用，并提高清洁、无毒和环境安全生产工艺的利用率。因此，它有助于减少纳米材料领域的环境影响、减少废物并提高能源效率。
