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首页> 外文期刊>Advanced Functional Materials >Energy Transfer Induced by Dye Encapsulation in a Hybrid Nanoparticle-Purple Membrane Reversible Assembly
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Energy Transfer Induced by Dye Encapsulation in a Hybrid Nanoparticle-Purple Membrane Reversible Assembly

机译：染料包裹在纳米粒子-紫色混合膜可逆组件中诱导的能量转移

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摘要

The purple membrane (PM) isolated from the bacteria Halobacterium salinarum (H. salinarum) arranges the transmembrane proton pump bacteriorhodopsin (bR) in a 2D hexagonal crystalline lattice. Here, PM sheets containing native bR bend into tube-like structures with open edges under acidic pH conditions. When decorated with gold nanoparticles (AuNPs), these same PM sheets yield a sealed tube assembly. Upon Rhodamine B (Rh B) sequestration inside the sealed tube, a dramatic decrease in Rh B fluorescence lifetime (tau(f)) from 1.5 ns (unencapsulated) to 14 ps (encapsulated) is observed. The dramatic decrease in lifetime is attributed to energy transfer between AuNPs and Rh B. Subsequent release from the AuNP-PM capsules triggered by an increase in pH shows that 93% of Rh B is recovered (tau = 14 min) due to the capsules' unfolding. The hybrid AuNP-PM material highlights the utility of multicomponent ensembles (i.e., lipid bilayer, protein array, and NPs) by demonstrating that complex, multistimuli 3D responses can lead to multiplexed functions such as controlling energy transfer in the confined, encapsulated state and breaking the energy pair via molecular release in response to a change in pH.
机译：从细菌盐藻（H. salinarum）分离出的紫色膜（PM）将跨膜质子泵细菌视紫红质（bR）排列在二维六边形晶格中。在此，含有天然bR的PM片材在酸性pH条件下会弯曲成管状结构，并带有开放边缘。当用金纳米颗粒（AuNPs）装饰时，这些相同的PM板会产生密封的管组件。将罗丹明B（Rh B）隔离在密封管内后，观察到Rh B荧光寿命（tau（f））从1.5 ns（未封装）降低到14 ps（封装）。寿命的显着减少归因于AuNP和Rh B之间的能量转移。随后pH升高触发了AuNP-PM胶囊的释放，表明93％的Rh B被回收（tau = 14分钟），这是由于胶囊的展开。 AuNP-PM杂化材料通过证明复杂的，多刺激的3D响应可以导致多重功能，例如控制处于密闭，包封状态的能量转移和破坏，突出了多组分集合体（即脂质双层，蛋白质阵列和NP）的实用性通过响应pH的变化而释放出分子的能量对。

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