Biofilm production is regulated by the Quorum Sensing system. Nowadays, Quorum Sensing represents an appealing target to design new compounds to increase antibiotics effects and avoid development of antibiotics multiresistance. In this research the use of liposomes to target two novel synthetic biofilm inhibitors is presented, focusing on a preformulation study to select a liposome composition for in vitro test. Five different liposome (LP) formulations, composed of phosphatidyl choline, cholesterol and charged surfactant (2:1:1, molar ratio) have been prepared by direct hydration and extrusion. As charged surfactants dicetyl phosphate didecyldimethylammonium chloride, di isobutyl phenoxy ethyl dimethyl benzyl ammonium chloride and stearylamine (SA) and have been used. Liposome charge, size and morphology were investigated by zeta potential, photon correlation spectroscopy, small angle x-ray spectroscopy and electron microscopy. LP-SA was selected for the loading of biofilm inhibitors and subjected to high performance liquid chromatography for entrapment capacity evaluation. LP-SA loaded inhibitors showed a higher diameter (223.6 nm) as compared to unloaded ones (205.7 nm) and a dose-dependent anti-biofilm effect mainly after 48 h of treatment, while free biofilm inhibitors loose activity. In conclusion, our data supported the use of liposomes as a strategy to enhance biofilm inhibitors effect.
生物膜的生成受到群体感应系统的调控。如今,群体感应代表着一个吸引人的目标,用于设计新化合物以增强抗生素的效果并避免抗生素多重耐药性的发展。本研究介绍了利用脂质体来靶向两种新型合成
生物膜
抑制剂的方法,重点是进行预配方研究以选择适合体外测试的脂质体组成。通过直接
水合和挤压法制备了五种不同的脂质体(LP)配方,由
磷脂酰
胆碱、
胆固醇和带电表面活性剂(摩尔比2:1:1)组成。使用了带电表面活性剂
二十二烷基
磷酸二十二烷基二甲基
氯化铵、二
异丁基苯氧乙基二甲基苄基
氯化铵和
硬脂胺(
SA)。通过ζ电位、光子相关光谱、小角度X射线光谱和电子显微镜研究了脂质体的电荷、大小和形态。选择了LP-
SA用于载荷
生物膜
抑制剂,并进行了高效
液相色谱法评估其包封能力。LP-
SA载荷的
抑制剂显示出较大的直径(223.6纳米),与未载荷的
抑制剂(205.7纳米)相比,并且在治疗48小时后主要呈剂量依赖的抗
生物膜效果,而游离的
生物膜
抑制剂失去活性。总之,我们的数据支持使用脂质体作为增强
生物膜
抑制剂效果的策略。