Related Experiment Video
Updated: Dec 13, 2025
07:12
Author Spotlight: Advancing Bioimaging and Therapy with Functional Nanomaterials
Published on: September 13, 2024
2.8K
Light-triggered redox activity of GdYVO4:Eu3+ nanoparticles
S L Yefimova1, P O Maksimchuk1, K O Hubenko1
1Institute for Scintillation Materials National Academy of Sciences of Ukraine, 60 Nauky Ave., 61072 Kharkiv, Ukraine.
Summary
Small gadolinium yttrium vanadate:europium (GdYVO4:Eu3+) nanoparticles show light-triggered redox activity, acting as either pro- or anti-oxidants. This tunable property suggests potential for novel cancer theranostic applications.
Area of Science:
- Nanotechnology
- Materials Science
- Biomedical Engineering
Background:
- Gadolinium Yttrium Vanadate:Europium (GdYVO4:Eu3+) nanoparticles (NPs) are nanoscale materials with potential biomedical applications.
- Redox activity of nanomaterials can be modulated by external stimuli, influencing biological processes.
- Understanding NP behavior in different environments is crucial for therapeutic development.
Purpose of the Study:
- To investigate the light-triggered redox activity of GdYVO4:Eu3+ nanoparticles in aqueous solutions and lipid suspensions.
- To determine how pre-treatment conditions affect the pro- or anti-oxidant properties of these NPs.
- To explore the potential of these multifunctional NPs as theranostic agents in cancer therapy.
Main Methods:
- Synthesis of small (2 nm) GdYVO4:Eu3+ nanoparticles.
- Evaluation of pro-/anti-oxidant activity using UV-vis spectroscopy with probe molecules for hydroxyl radicals (·OH) and superoxide anions (O2•-).
- Analysis of lipid oxidation under the influence of the NPs in various pre-treatment conditions (UV light exposure or dark storage).
Main Results:
- GdYVO4:Eu3+ NPs exhibited light-dependent redox activity, switching between pro-oxidant and anti-oxidant behavior based on pre-treatment.
- The NPs' redox state was successfully modulated by UV light exposure or storage in the dark.
- Significant impact on lipid oxidation was observed, correlating with the NPs' redox state.
Conclusions:
- GdYVO4:Eu3+ NPs possess tunable, light-triggered redox activity.
- These NPs demonstrate potential as multifunctional theranostic agents for cancer therapy due to their fluorescence, triggered redox activity, and drug-carrier capabilities.
Related Concept Videos
01:24Redox Reactions
58.0K
Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
58.0K
01:27Redox Reactions
692
Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
692
01:14Photoluminescence: Applications
902
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
902
01:26Redox Titration: Other Oxidizing and Reducing Agents
1.2K
Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
1.2K
01:26Thermal and Photochemical Electrocyclic Reactions: Overview
2.8K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.8K
01:23Redox Equilibria: Overview
1.4K
A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
1.4K