Amalgamated gold-nanoalloys with enhanced catalytic activity for the detection of mercury ions (Hg2+) in seawater samples

Logan, Natasha; McVey, Claire; Elliott, Christopher T.; Cao, Cuong

doi:10.1007/s12274-020-2731-y

Cited by 51 publications

(23 citation statements)

References 54 publications

(68 reference statements)

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“…[302], e Ref. [303] with permission functionalizing AuNPs with oligo-ethylene glycol (OEG) [293]. In this proposal, OEG-AuNPs exhibited enhanced stability and weakened catalytic properties in a wide pH range under high NaCl concentration, which effectively ameliorated the poor stability of bare-AuNPs (Fig.…”

Section: Heavy Metal Ionsmentioning

confidence: 98%

“…As high electrolyte has an adverse effect on the catalytic performance and stability of nanozymes, analyzing heavy metal ions in seawater is much more difficult than other liquid samples such as lake water and drinking water [ 292 ]. Logan et al quantitatively determined mercury ions in complicated water matrices using OEG-Au complex by functionalizing AuNPs with oligo-ethylene glycol (OEG) [ 293 ]. In this proposal, OEG-AuNPs exhibited enhanced stability and weakened catalytic properties in a wide pH range under high NaCl concentration, which effectively ameliorated the poor stability of bare-AuNPs (Fig.…”

Section: Applications Of Metal- and Metal Oxide-based Nanozymesmentioning

confidence: 99%

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A Review on Metal- and Metal Oxide-Based Nanozymes: Properties, Mechanisms, and Applications

et al. 2021

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Since the ferromagnetic (Fe3O4) nanoparticles were firstly reported to exert enzyme-like activity in 2007, extensive research progress in nanozymes has been made with deep investigation of diverse nanozymes and rapid development of related nanotechnologies. As promising alternatives for natural enzymes, nanozymes have broadened the way toward clinical medicine, food safety, environmental monitoring, and chemical production. The past decade has witnessed the rapid development of metal- and metal oxide-based nanozymes owing to their remarkable physicochemical properties in parallel with low cost, high stability, and easy storage. It is widely known that the deep study of catalytic activities and mechanism sheds significant influence on the applications of nanozymes. This review digs into the characteristics and intrinsic properties of metal- and metal oxide-based nanozymes, especially emphasizing their catalytic mechanism and recent applications in biological analysis, relieving inflammation, antibacterial, and cancer therapy. We also conclude the present challenges and provide insights into the future research of nanozymes constituted of metal and metal oxide nanomaterials.

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Section: Heavy Metal Ionsmentioning

confidence: 98%

Section: Applications Of Metal- and Metal Oxide-based Nanozymesmentioning

confidence: 99%

A Review on Metal- and Metal Oxide-Based Nanozymes: Properties, Mechanisms, and Applications

et al. 2021

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“…Most applications encompassed in this category are related to diagnostic tools to detect toxic contaminants in environmental waters. This mainly includes heavy metals [136,[176][177][178][179][180][181][182][183], pesticides [100,184,185] or micro-organisms [102,[186][187][188][189], for being the most common contaminants, but it could potentially include any others. Nonetheless, these are not the only examples of gold nanozyme applications in the environmental sector, especially since their catalytic activities started to be exploited for wastewater treatment to degrade or convert toxic molecules into innocuous products [190,191].…”

Section: Environmental Applicationsmentioning

confidence: 99%

“…This approach has the particularity of being the only one that combines gold nanozymes with smartphones in any way. Recently, Logan and co-workers have lowered the LOD values reported for Hg detection using highly stable oligo ethylene glycol (OEG)-functionalized AuNPs [ 183 ], whose nanozyme activity was recovered in the presence of the metal (Fig. 11 ).…”

Section: Other Applications Of Gold Nanozymesmentioning

confidence: 99%

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Gold Nanozymes: From Concept to Biomedical Applications

et al. 2020

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In recent years, gold nanoparticles have demonstrated excellent enzyme-mimicking activities which resemble those of peroxidase, oxidase, catalase, superoxide dismutase or reductase. This, merged with their ease of synthesis, tunability, biocompatibility and low cost, makes them excellent candidates when compared with biological enzymes for applications in biomedicine or biochemical analyses. Herein, over 200 research papers have been systematically reviewed to present the recent progress on the fundamentals of gold nanozymes and their potential applications. The review reveals that the morphology and surface chemistry of the nanoparticles play an important role in their catalytic properties, as well as external parameters such as pH or temperature. Yet, real applications often require specific biorecognition elements to be immobilized onto the nanozymes, leading to unexpected positive or negative effects on their activity. Thus, rational design of efficient nanozymes remains a challenge of paramount importance. Different implementation paths have already been explored, including the application of peroxidase-like nanozymes for the development of clinical diagnostics or the regulation of oxidative stress within cells via their catalase and superoxide dismutase activities. The review also indicates that it is essential to understand how external parameters may boost or inhibit each of these activities, as more than one of them could coexist. Likewise, further toxicity studies are required to ensure the applicability of gold nanozymes in vivo. Current challenges and future prospects of gold nanozymes are discussed in this review, whose significance can be anticipated in a diverse range of fields beyond biomedicine, such as food safety, environmental analyses or the chemical industry.

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Recent Advances in Silver nanozymes: Concept, Mechanism, and Applications in Detection

Mishra

Abdal‐hay

Rather

et al. 2022

Adv Materials Inter

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physicochemical properties that are entirely different from those of their bulk counterparts. They have been exploited vigorously for numerous applications, including in medical and nonmedical fields. However, one must not realize it to be a novel technology, as its roots can be traced centuries ago. For instance, copper and silver (Ag) NPs can be dated back to the 9 th century, when they were used to shine the ceramic artifacts. [1] One of the earlier and renowned examples is the Lycurgus cup, made by the Romans in the 4 th century using Au-Ag alloy NPs to produce greenish-red color. [2] Even though the use of NPs could be found in many such old works of literature; their real potential was not completely understood until 1959, when Richard Feynman delivered the renowned lecture "There's Plenty of Room at the Bottom: An Invitation to Enter a New Field of Physics. [3] This brought in a stream of exceptional studies, and researchers were able to assign quantum size effects as the reason for a change of properties when moving from bulk to nano regime. As things became more and more precise, nanomaterials began to find their extensive role in varied applications. One of the significant applications was their role as enzyme mimetics due to their excellent catalytic properties.The metabolic reactions in our body are catalyzed by the protein molecules called enzymes. It was James B Sumner who, in 1926, established the first enzyme, urease, to be a protein, which won him a Nobel Prize for this discovery in 1946. [4] All the enzymes have been considered protein molecules ever since. However, due to their high production cost and rapid denaturation under variable pH and temperature settings, they have limited their industrial applications. [5] Therefore, a need was felt to develop enzyme mimicking materials, more precisely termed "artificial enzymes" by Robert Breslow. [6] These catalytically active molecules can be anything from polymers, cyclodextrins to supramolecules and dendrimers, showing enzyme-like activity. [7][8][9][10] Recently, the discovery of dismutaselike activity of fullerene derivatives [11,12] and peroxidase-mimicking catalysis of Fe 3 O 4 NPs [13,14] enunciated the promising career of NPs in the field of biomimetics. The importance and broad prospect of nanozymes can be understood in Figure 1. This shows the increasing number of publications each year on nanozymes. These nanozymes have been majorly used Natural enzymes accelerate substrate-specific reactions making them of exquisite interest for various applications. However, their appeal is lost in a practical setting due to low stability and high preparation expenses. This is the primary reason behind the flourishing in the research of nanozyme, i.e., artificial enzymes, in the past decade. Their unique physicochemical properties make them a promising candidate for various applications, especially in diagnostics and detection. They possess an enzyme-like activity and can overcome the drawbacks of natural protein-based enzymes. Nanozymes are nanomateri...

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Amalgamated gold-nanoalloys with enhanced catalytic activity for the detection of mercury ions (Hg2+) in seawater samples

Cited by 51 publications

References 54 publications

A Review on Metal- and Metal Oxide-Based Nanozymes: Properties, Mechanisms, and Applications

A Review on Metal- and Metal Oxide-Based Nanozymes: Properties, Mechanisms, and Applications

Gold Nanozymes: From Concept to Biomedical Applications

Recent Advances in Silver nanozymes: Concept, Mechanism, and Applications in Detection

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