Noble metal nanoparticles (NPs) have been widely used in many consumer products. Their effects on the antioxidant activity of commercial dietary supplements have not been well evaluated. In this study, we examined the effects of gold (Au NPs), silver (Ag NPs), platinum (Pt NPs), and palladium (Pd NPs) on the hydroxyl radical (·OH) scavenging ability of three dietary supplements vitamin C (L-ascorbic acid, AA), (-)-epigallocatechin gallate (EGCG), and gallic acid (GA). By electron spin resonance (ESR) spin-trapping measurement, the results show that these noble metal NPs can inhibit the hydroxyl radical scavenging ability of these dietary supplements.

中文翻译：

---

贵金属纳米颗粒对膳食抗氧化剂清除羟自由基能力的影响。

贵金属纳米粒子（NPs）已广泛用于许多消费产品。他们对商业膳食补充剂抗氧化活性的影响尚未得到很好的评估。在这项研究中，我们研究了金（Au NPs），银（Ag NPs），铂（Pt NPs）和钯（Pd NPs）对三种膳食补充剂维生素C清除羟自由基（·OH）能力的影响（ L-抗坏血酸（AA），（-）-表没食子儿茶素没食子酸酯（EGCG）和没食子酸（GA）。通过电子自旋共振（ESR）自旋捕获测量，结果表明这些贵金属NP可以抑制这些膳食补充剂的羟自由基清除能力。