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Interactions of graphene oxide with luminescent biofunctionalized semiconductor nanoparticles: simultaneous monitoring in a protein- semiconductor coupled system

机译：石墨烯氧化物与发光生物官能化半导体纳米颗粒的相互作用：在蛋白质半导体耦合系统中同时监测

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摘要

We have demonstrated the physicochemical aspects of the interactions of free graphene oxide (GO) with bovine serum albumin (BSA) encapsulated ZnSe NPs as a representative protein-semiconductor coupled system. The well-resolved emissions of tryptophan and ZnSe NPs in the chosen biofunctional nanomaterial enables to follow interactions of GO with protein and semiconductor components simultaneously. The long average emission lifetime of semiconductor nanoparticles in BSA-ZnSe NPs changed significantly on interactions with GO from 131.5 to 108.6 ns, while there was little change from 5.24-5.08 ns for protein component. Influence of solvent polarity on steady-state emissions provide evidence of non-electrostatic interactions of BSA and charge transfer from ZnSe NPs towards GO sheet. Circular dichroism spectral measurements suggest change in protein secondary structure and iodide quenching studies provide a quantitative estimate of decrease in accessibility of tryptophan residues (fa) towards polar environment (fa changes from 42% to 17%) on interactions of GO with BSA-ZnSe NPs. These results are consistent with the observed changes in UV-vis absorption and zeta potential, which also indicate hydrophobic association of GO with BSA-ZnSe NPs. Further, electron transfer process is evident from Raman peak shift and the observed changes in ID/IG ratio, which indicate strong interactive nature of BSA-ZnSe NPs towards GO. We also justified the thermodynamic feasibility of electron transfer process and calculated the rate of electron transfer from semiconductor component in BSA-ZnSe NPs to the GO surface to be 2.06 ~ 109 s1. Thus, the present study provides useful information for future fabrication of multifunctional single platform combining the graphene, semiconductor and protein molecules.
机译：我们已经证明了用牛血清白蛋白（BSA）包封的ZnSe NP作为代表性的蛋白半导体耦合系统的物理化学方面。选择的生物官能纳米材料中色氨酸和ZnSe NP的良好分离的排放能够同时遵循与蛋白质和半导体部件的相互作用。 BSA-ZNSE NPS中半导体纳米颗粒的长平均发射寿命显着改变了与131.5至108.6ns的相互作用，而蛋白质组分的5.24-5.08 ns几乎没有变化。溶剂极性对稳态排放的影响提供了BSA的非静电相互作用的证据，并从ZnSe NPS向去纸张的电荷转移。圆形二中间谱测量表明蛋白质二级结构的变化和碘化物猝灭研究提供了在BSA-ZNSE NPS的相互作用中对色氨酸残留（FA）对极性环境（FA）的可及性降低的定量估计。这些结果与UV-Vis吸收和Zeta电位的观察到变化一致，这也表明使用BSA-ZnSe NPS的疏水性结合。此外，电子转移过程从拉曼峰值移位和ID / IG比的观察变化中明显明显，这表明BSA-ZNSE NPS的强烈互动性质。我们还证明了电子转移过程的热力学可行性，并计算了BSA-ZNSE NP中的半导体组分的电子转移速率，进入去表面为2.06〜109 S1。因此，本研究提供了用于将石墨烯，半导体和蛋白质分子组合的多功能单平台的未来制造的有用信息。

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  • 来源
    《RSC Advances》 |2015年第109期|共8页
  • 作者

    Somashree Kundu; Susmita Maiti; Debasmita Ghosh;

  • 作者单位

    UGC-DAE Consortium for Scientic Research Kolkata India.;

    UGC-DAE Consortium for Scientic Research Kolkata India.;

    UGC-DAE Consortium for Scientic Research Kolkata India.;

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  • 正文语种 eng
  • 中图分类 化学;
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