Cheap artificial light harvesting systems, which competently harvest solar energy and promote efficient energy transfer, are highly sought after in the renewable sector. We report the synthesis of self-assembled peptide-porphyrin fibers (SJ 6) fabricated with iron(III) oxide (Fe3 O4 ) nanoparticles as feasible electron acceptors. Charge-complementarity between the negatively charged peptide (20E) and the protonated Zn-tetraphenyl porphyrin (ZnTPyP) led to an ordered assembly of the ZnTPyP molecules, enabling efficient light harvesting. X-ray diffraction data indicates a more ordered structure in SJ 6 compared to 20E and ZnTPyP. The incorporation of Fe3 O4 nanoparticles into SJ 6 showed significant fluorescence quenching, indicating efficient electron flow from the donor to the acceptor. The SJ 6-nFe3 O4 system performed the light reaction of photosynthesis as confirmed by the reduction of 1 mM NAD+ to 0.180 mM NADH upon exposure to visible light (Xe lamp λ > 420 nm) for 1 h. The photochemical regeneration of NADH using the SJ 6-nFe3 O4 system was coupled to glutamate dehydrogenase-catalyzed conversion of α-ketoglutarate to L-glutamate. These results confirm the successful synthesis of an artificial light harvesting peptide-porphyrin system with Fe3 O4 nanoparticles as promising low-cost electron separators.

中文翻译：

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走向更便宜的光收集系统：在自组装肽卟啉纳米纤维中使用地球上丰富的金属氧化物纳米颗粒。

廉价的人造光收集系统能够有效地收集太阳能并促进有效的能量转移，在可再生能源领域受到高度追捧。我们报告了自组装肽卟啉纤维 (SJ 6) 的合成，该纤维以铁 (III) 氧化物 (Fe3 O4 ) 纳米粒子作为可行的电子受体制造。带负电荷的肽 (20E) 和质子化的 Zn-四苯基卟啉 (ZnTPyP) 之间的电荷互补性导致 ZnTPyP 分子有序组装，从而实现高效的光捕获。X 射线衍射数据表明，与 20E 和 ZnTPyP 相比，SJ 6 中的结构更有序。将 Fe3 O4 纳米粒子掺入 SJ 6 中显示出显着的荧光猝灭，表明电子从供体到受体的有效流动。SJ 6-nFe3 O4 系统进行光合作用的光反应，这通过暴露于可见光（Xe 灯 λ > 420 nm）1 小时后 1 mM NAD+ 减少至 0.180 mM NADH 得到证实。使用 SJ 6-nFe3 O4 系统的 NADH 光化学再生与谷氨酸脱氢酶催化的 α-酮戊二酸向 L-谷氨酸的转化相结合。这些结果证实了以 Fe3 O4 纳米粒子作为有前途的低成本电子分离器的人工光捕获肽-卟啉系统的成功合成。