Microorganisms based biosynthesis of nanomaterials has triggered significant attention, due to their great potential as vast source of the production of biocompatible nanoparticles (NPs). Such biosynthesized functional nanomaterials can be used for various biomedical applications. The present study investigates the green synthesis of silver nanoparticles (Ag NPs) using the fungus Curvularia pallescens (C. pallescens) which is isolated from cereals. The C. pallescens cell filtrate was used for the reduction of AgNO3 to Ag NPs. To the best of our knowledge C. pallescens is utilized first time for the preparation of Ag NPs. Several alkaloids and proteins present in the phytopathogenic fungus C. pallescens were mainly responsible for the formation of highly crystalline Ag NPs. The as-synthesized Ag NPs were characterized by using UV-Visible spectroscopy, X-ray diffraction and transmission electron microscopy (TEM). The TEM micrographs have revealed that spherical shaped Ag NPs with polydisperse in size were obtained. These results have clearly suggested that the biomolecules secreted by C. pallescens are mainly responsible for the formation and stabilization of nanoparticles. Furthermore, the antifungal activity of the as-prepared Ag NPs was tested against Cladosporium fulvum, which is the major cause of a serious plant disease, known as tomato leaf mold. The synthesized Ag NPs displayed excellent fungicidal activity against the tested fungal pathogen. The extreme zone of reduction occurred at 50 μL, whereas, an increase in the reduction activity is observed with increasing the concentration of Ag NPs. These encouraging results can be further exploited by employing the as synthesized Ag NPs against various pathogenic fungi in order to ascertain their spectrum of fungicidal activity.

译文

基于微生物的纳米材料的生物合成已引起广泛关注,因为它们具有作为生物相容性纳米颗粒 (NPs) 生产的巨大潜力。这种生物合成的功能性纳米材料可用于各种生物医学应用。本研究使用从谷物中分离出的真菌弯孢菌 (C. pallescens) 研究了银纳米颗粒 (Ag NPs) 的绿色合成。使用C. pallescens细胞滤液将AgNO3还原为Ag np。据我们所知,C. pallescens首次用于制备Ag NPs。植物病原真菌C. pallescens中存在的几种生物碱和蛋白质主要负责形成高度结晶的Ag np。通过紫外可见光谱,x射线衍射和透射电子显微镜 (TEM) 对合成的Ag np进行了表征。TEM显微照片显示,获得了尺寸多分散的球形Ag np。这些结果清楚地表明,由C. pallescens分泌的生物分子主要负责纳米颗粒的形成和稳定。此外,还测试了所制备的Ag NPs对fulvum的抗真菌活性,这是严重的植物病害 (称为番茄叶霉病) 的主要原因。合成的Ag np对测试的真菌病原体具有出色的杀菌活性。还原的极端区域发生在50μl,而随着Ag NPs浓度的增加,还原活性增加。通过使用as合成的Ag np对抗各种病原真菌,可以进一步利用这些令人鼓舞的结果,以确定其杀菌活性谱。

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