纳米毒理学和安全

纳米材料独特的物理化学特性使其在各种应用中极具吸引力，但也可能导致其产生不良生物效应。纳米毒理学研究这些特性（包括尺寸、形状、表面化学、电荷和溶解度）如何影响其与生物体的相互作用。一个关键问题是纳米颗粒在通过吸入、摄入或皮肤接触后在体内的易位能力。纳米颗粒体积小，因此能够逃避正常的生理清除机制，例如肺部巨噬细胞的吞噬作用，并进入那些受到保护、不受较大颗粒影响的敏感器官和组织。

Once inside the body, nanoparticles can induce toxicity through several mechanisms. One of the most studied is the generation of reactive oxygen species (ROS), leading to oxidative stress. The high surface area of nanoparticles provides a large interface for catalytic reactions that can produce free radicals, which in turn can damage cells by oxidizing proteins, lipids, and DNA. Another mechanism is inflammation, where the immune system recognizes the nanoparticles as foreign invaders, triggering a persistent inflammatory response that can lead to chronic disease. Furthermore, some nanomaterials, particularly fibrous ones like certain types of carbon nanotubes, have been compared to asbestos due to their high aspect ratio, raising concerns about carcinogenicity. The field aims to understand these mechanisms to establish dose-response relationships, identify hazardous materials, and guide the development of safer nanomaterials and handling protocols to mitigate risks for workers, consumers, and the environment.