Probing hydroxyl radical generation from H2O2 upon plasmon excitation of gold nanorods using electron spin resonance: Molecular oxygen-mediated activation
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Xiaochun Wu1(
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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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Probing hydroxyl radical generation from H2O2 upon plasmon excitation of gold nanorods using electron spin resonance: Molecular oxygen-mediated activation
), Xiaochun Wu1(
)
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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Acknowledgements
The work was supported by the National Basic Research Program of China (No. 2012CB934001), the National Natural Science Foundation of China (No. 21173056), and partially supported by a regulatory science grant under the FDA Nanotechnology CORES Program. The authors appreciate Dr. Lili Fox Vélez (Office of Regulatory Science, CFSAN) for providing scientific writing support. This article is not an official U.S. FDA guidance or policy statement. No official support or endorsement by the U.S. FDA is intended or should be inferred.
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