Doped Graphene Quantum Dots as Biocompatible Radical Scavenging Agents.

Doped Graphene Quantum Dots as Biocompatible Radical Scavenging Agents.
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DOI:
10.3390/antiox12081536
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发表时间:
2023-07-31
期刊:
Antioxidants (Basel, Switzerland)
影响因子:
--
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--
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其他
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氧化应激被证明是一个主要因素,在众多的不利条件,从阿尔茨海默氏症到癌症。因此,开发有效的自由基清除剂以消除驱动许多氧化过程的活性氧(ROS)已变得至关重要。除了传统的抗氧化剂,纳米结构和金属有机配合物最近显示出有前途的自由基清除潜力。为了设计最佳的纳米ROS清除剂,我们合成了十种类型的生物相容性石墨烯量子点(GQD)与各种金属掺杂剂增强。这些新的金属掺杂的GQD结构的自由基清除能力,第一次,通过DPPH,KMnO 4,和RHB(罗丹明B保护剂)测定评估。虽然所有金属掺杂的GQD一致地表现出比未掺杂的核更高的抗氧化性质,但铝掺杂的GQD表现出抗坏血酸阳性对照的60-95%的自由基清除能力。Tm掺杂的GQD在KMnO 4测定中与抗坏血酸的自由基清除特性相匹配。所有掺杂的GQD结构都具有荧光成像能力,使其能够在体外进行跟踪,确保其成功的细胞内化。鉴于这种多功能性,生物相容性掺杂的GQD抗氧化剂可以成为多模式治疗的潜在候选者,包括减少ROS,同时成像和治疗递送至癌症肿瘤。
Oxidative stress is proven to be a leading factor in a multitude of adverse conditions, from Alzheimer’s disease to cancer. Thus, developing effective radical scavenging agents to eliminate reactive oxygen species (ROS) driving many oxidative processes has become critical. In addition to conventional antioxidants, nanoscale structures and metal–organic complexes have recently shown promising potential for radical scavenging. To design an optimal nanoscale ROS scavenging agent, we have synthesized ten types of biocompatible graphene quantum dots (GQDs) augmented with various metal dopants. The radical scavenging abilities of these novel metal-doped GQD structures were, for the first time, assessed via the DPPH, KMnO4, and RHB (Rhodamine B protectant) assays. While all metal-doped GQDs consistently demonstrate antioxidant properties higher than the undoped cores, aluminum-doped GQDs exhibit 60–95% radical scavenging ability of ascorbic acid positive control. Tm-doped GQDs match the radical scavenging properties of ascorbic acid in the KMnO4 assay. All doped GQD structures possess fluorescence imaging capabilities that enable their tracking in vitro, ensuring their successful cellular internalization. Given such multifunctionality, biocompatible doped GQD antioxidants can become prospective candidates for multimodal therapeutics, including the reduction of ROS with concomitant imaging and therapeutic delivery to cancer tumors.
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