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Probing hydroxyl radical generation from H2O2 upon plasmon excitation of gold nanorods using electron spin resonance: Molecular oxygen-mediated activation

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Abstract

Gold nanostructures are among the noble metal nanomaterials being intensely studied due to their good biocompatibility, tunable localized surface plasmon resonance (SPR), and ease of modification. These properties give gold nanostructures many potential chemical and biomedical applications. Herein, we demonstrate the critical role of oxygen activation during the decomposition of hydrogen peroxide (H2O2) in the presence of photoexcited gold nanorods (AuNRs) by using electron spin resonance (ESR) techniques. Upon SPR excitation, O2 is activated first, and the resulting reactive intermediates further activate H2O2 to produce •OH. The reactive intermediates exhibit singlet oxygen-like (1O2-like) reactivity, indicated by 1O2-specific oxidation reaction, quenching behaviors, and the lack of the typical 1O2 ESR signal. In addition, by using the antioxidant sodium ascorbate (NaA) as an example, we show that hydroxyl radicals from H2O2 activation can induce much stronger NaA oxidation than that in the absence of H2O2. These results may have significant biomedical implications. For example, as oxidative stress levels are known to influence tumorigenesis and cancer progression, the ability to control redox status inside tumor microenvironments using noble metal nanostructures may provide new strategies for regulating the metabolism of reactive oxygen species and new approaches for cancer treatment.

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Authors and Affiliations

  1. CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, China

    Tao Wen, Hui Zhang & Xiaochun Wu

  2. Division of Analytical Chemistry, Office of Regulatory Science, Center for Food Safety and Applied Nutrition, US Food and Drug Administration, College Park, MD, 20740, USA

    Tao Wen, Yu Chong & Jun-Jie Yin

  3. Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100005, China

    Tao Wen

  4. Division of Bioanalytical Chemistry, Office of Regulatory Science, Center for Food Safety and Applied Nutrition, US Food and Drug Administration, College Park, MD, 20740, USA

    Wayne G. Wamer

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  1. Tao Wen
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  2. Hui Zhang
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  3. Yu Chong
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  4. Wayne G. Wamer
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  5. Jun-Jie Yin
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Correspondence to Jun-Jie Yin or Xiaochun Wu.

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These authors contributed equally to this work.

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Wen, T., Zhang, H., Chong, Y. et al. Probing hydroxyl radical generation from H2O2 upon plasmon excitation of gold nanorods using electron spin resonance: Molecular oxygen-mediated activation. Nano Res. 9, 1663–1673 (2016). https://doi.org/10.1007/s12274-016-1060-7

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  • DOI: https://doi.org/10.1007/s12274-016-1060-7

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