A long-lived amphiphilic fluorescent probe studied in POPC air–water monolayer and solution bilayer systems
作者:Gabriela Gramlich、Jiayun Zhang、Mathias Winterhalter、Werner M Nau
DOI:10.1016/s0009-3084(01)00133-5
日期:2001.11
partitioning into a lipid membrane model was quantified at the air-water interface by spreading 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) monolayers. Measurements with different molar fractions of Fluorazophore-L revealed a small but significant reduction of the mean area in the mixed monolayer. The excess free energy of mixing (-0.5+/-0.1 kT) indicated a weakly attractive interaction slightly
合成并表征了一种新型的两亲性荧光探针(Fluorazophore-L),该探针以强偶极非离子偶氮烷为头基,棕榈酰尾巴为特征。发现纯的氟唑啉酮-L具有足够的两亲性,可以形成稳定的空气-水单层。表面压力对面积的分析表明,在29 mN m(-1)时,每个分子的面积约为34 +/- 2 A(2)。通过散布1-棕榈酰基-2-油酰基-sn-甘油-3-磷酸胆碱(POPC)单层在空气-水界面处定量划分为脂质膜模型。用氟唑啉酮-L的不同摩尔分数进行的测量表明,混合单层的平均面积有小幅但显着的减少。多余的混合自由能(-0.5 +/- 0.1 kT)表明相互作用力较热能稍弱,这表明荧光探针在脂质单层内具有良好的可混溶性,而没有重大的结构修饰。光谱测量证实了将氟偶氮磷-L掺入POPC囊泡中。荧光寿命非常长(在空气中为125 +/- 5 ns),具有单指数荧光衰减。