The present invention includes compositions and methods of making hydrophilic nanostructured antibiotics (i.e. nanoantibiotics), including nanoantibiotics that use environmentally degradable biomolecules as the backbone building blocks, wherein the backbone building blocks can include spherical backbones such as sucroses, cyclodextrins, glycogens, and phytoglycogen with different diameters, or rod-like backbone building blocks such as dextrins, amyloses, and celluloses with different lengths. These hydrophilic nanoantibiotics with well-defined sizes and shapes can selectively disrupt bacterial membranes (i.e., serve as membrane-active antimicrobials) while being benign to mammalian cells. Depending on the size and shape difference of the hydrophilic nanoantibiotics, they can also selectively kill one type of bacteria (e.g., gram-negative) over another type (e.g., gram-positive). The environmentally degradable nanoantibiotics will have built-in dismantling “switches” to dismantle and become antimicrobial inactive in responsive to environmental stimuli once released into natural habitat, hence greatly reducing the possibility of developing bacteria resistance.
本发明涵盖了制备亲
水性纳米结构抗生素(即纳米抗生素)的组合物和方法,包括使用环境可降解
生物分子作为骨架构建块的纳米抗生素,其中骨架构建块可以包括球形骨架,如
蔗糖、
环糊精、
糖原和植物
糖原,直径不同,或者类似棒状的骨架构建块,如
糊精、淀粉和
纤维素,长度不同。这些具有明确定义大小和形状的亲
水性纳米抗生素可以选择性地破坏细菌膜(即作为膜活性抗菌剂),同时对哺乳动物细胞无害。根据亲
水性纳米抗生素的大小和形状差异,它们还可以选择性地杀死一种类型的细菌(例如革兰氏阴性菌),而不影响另一种类型(例如革兰氏阳性菌)。环境可降解的纳米抗生素将具有内置的拆除“开关”,一旦释放到自然栖息地中,将对环境刺激做出反应并迅速失活,从而大大降低细菌抗药性的可能性。