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Investigating the role of ATP towards amplified peroxidase activity of Iron oxide nanoparticles in different biologically relevant buffers

机译:研究ATP在不同生物学相关缓冲液中对氧化铁纳米颗粒放大的过氧化物酶活性的作用

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Evaluating the colloidal stability and enzyme mimetic nature of nanozymes at different buffer conditions is necessary to develop novel biosensing, biomedical and environmental applications. It is established that Fe3O4 nanoparticles show optimum peroxidase activity at pH(4) and it has also been shown that nucleotides like ATP can exhibit synergistic effect to enhance peroxidase activity at neutral pH. In this study we show the effect of buffers, pH and presence of ATP on peroxidase activity of Fe3O4 NPs and elucidate the mechanism involved in enhanced activity at neutral pH. Fe3O4 NPs colloidal stability was assessed over a period of 72 h from acidic to neutral pH. It was explained that OH radical generation from the synergistic combination of nucleotides and Fe3O4 NPs resulted in peroxidase activity at neutral pH and found that buffer concentration has a major effect on this activity. These findings challenge the existing theory of peroxidase activity demonstrated by Fe3O4 NPs at acidic pH. Moreover, the posibility can overcome the pH lacuna in designing novel biosensors and can also extend the heterogeneous Fenton reaction of Fe3O4 NPs over a wide range of pH.
机译:评价纳米酶在不同缓冲条件下的胶体稳定性和酶模拟性质对于开发新型生物传感,生物医学和环境应用是必要的。已确定Fe3O4纳米颗粒在pH(4)时显示最佳的过氧化物酶活性,并且还显示出像ATP这样的核苷酸在中性pH下可以发挥协同作用来增强过氧化物酶活性。在这项研究中,我们显示了缓冲液,pH和ATP的存在对Fe3O4 NPs过氧化物酶活性的影响,并阐明了在中性pH下活性增强的机制。在从酸性到中性pH的72小时内,评估了Fe3O4 NPs的胶体稳定性。据解释,由核苷酸和Fe3O4 NP的协同组合产生的OH自由基导致在中性pH下的过氧化物酶活性,并且发现缓冲液浓度对该活性有重大影响。这些发现挑战了由Fe3O4 NP在酸性pH值下证明的过氧化物酶活性的现有理论。此外,该可能性可以克服设计新型生物传感器中的pH缺陷,并且还可以在较宽的pH范围内扩展Fe3O4 NP的异质Fenton反应。

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