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首页> 外文期刊>RSC Advances >Intrinsic polyphenol oxidase-like activity of gold@platinum nanoparticles
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Intrinsic polyphenol oxidase-like activity of gold@platinum nanoparticles

机译：金@铂纳米粒子的内在多酚氧化酶样活性

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摘要

Metal nanoparticles (NPs) have received considerable attention in recent years for their unique properties and potential applications in catalysis. However, few studies have employed an integrated approach to investigate the enzyme mimetic activities of metal NPs. The aim of the present study was to evaluate the enzyme mimetic activity of gold@platinum (Au@Pt) NPs. Specifically, the lipoxygenase (LOX), glutathione reductase (GR), glutathione peroxidase (GPx), and polyphenol oxidase (PPO) activities of Au@Pt NPs were examined. The results showed that Au@Pt NPs exhibited PPO mimetic activity over a wider range of pH values and temperatures compared with PPO. Kinetic analysis showed that Au@Pt NPs exhibited higher affinity for certain substrates than the natural enzyme PPO. Furthermore, we also determined the catalytic activity of Au@Pt NPs in the autoxidation of phenol substrates, including pyrogallol, 3,4-dihydroxy-L-phenylalanine, and catechol by electron spin resonance.
机译：近年来，金属纳米颗粒（NPs）因其独特的性能和在催化中的潜在应用而受到广泛关注。但是，很少有研究采用综合方法来研究金属NP的酶模拟活性。本研究的目的是评估金铂（Au @ Pt）NP的酶模拟活性。具体而言，检查了Au @ Pt NP的脂氧合酶（LOX），谷胱甘肽还原酶（GR），谷胱甘肽过氧化物酶（GPx）和多酚氧化酶（PPO）活性。结果表明，与PPO相比，Au @ Pt NPs在更宽的pH值和温度范围内表现出PPO模拟活性。动力学分析表明，Au @ Pt NPs对某些底物的亲和力高于天然酶PPO。此外，我们还通过电子自旋共振测定了Au @ Pt NPs在苯酚底物包括邻苯三酚，3,4-二羟基-L-苯丙氨酸和邻苯二酚的自氧化中的催化活性。

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