Quinone Acceptor
Quinone Acceptor - Related Videos
01:17
Oxidation of Phenols to Quinones
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2025
In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen. o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox property is crucial in...
09:57
18F-Labeling of Radiotracers Functionalized with a Silicon Fluoride Acceptor (SiFA) for Positron Emission Tomography
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Cited by 3 •
2020
The synthesis of fluorine-18 (18F) labeled radiopharmaceuticals for positron emission tomography typically requires months of experience. When incorporated into a radiotracer, the silicon-fluoride acceptor (SiFA) motif enables a simple 18F-labeling protocol that is independent of costly equipment and preparatory training, while reducing precursor quantity needed and utilizing milder reaction conditions.
10:23
Synthesis and Functionalization of 3D Nano-graphene Materials: Graphene Aerogels and Graphene Macro Assemblies
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Cited by 5 •
2015
This video method describes the synthesis of high surface area, monolithic 3D graphene-based materials derived from polymer precursors as well as single layer graphene oxide.
02:59
An In Vitro Assay for Measuring Neutrophil Serine Protease Activity Using a Fluorescent Reporter
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2025
This video demonstrates an in vitro assay to quantify neutrophil serine protease activity in sputum samples. The sample containing secreted protease is incubated with a fluorescent reporter bearing a recognition motif. Cleavage of the motif by the protease enables individual fluorescence emission by the donor and acceptor fluorophore of the reporter, indicating protease activity in the sample.
03:32
Amplified Luminescent Proximity Homogeneous Assay: A Bead-Based Proximity Assay to Screen Small Molecules Inhibiting Protein-Protein Interactions
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2025
In this video, we demonstrate the amplified luminescent proximity homogeneous assay—a bead-based proximity assay. It utilizes homogeneously-sized acceptor and donor beads, immobilized with two proteins that tend to interact to screen potential small molecules inhibiting protein interactions.
FAQs
A quinone acceptor can undergo reversible reduction by receiving either one or two electrons. It may also take up protons, producing a quinol form that carries these reducing equivalents onward. This flexible chemistry allows the molecule to connect separate electron-transfer reactions while maintaining a reversible relationship between oxidized quinone and reduced quinol states.
The conjugated ring supports the reversible redox changes required for electron acceptance and later transfer. Because the molecule can shift between oxidized and reduced forms, it serves as an intermediate rather than a one-time electron sink. This property helps biological systems move reducing equivalents through linked reactions involved in cellular energy conversion.
Within membrane-associated electron-transfer pathways, quinones shuttle electrons between protein complexes while their reduction can also involve proton uptake. Subsequent transfer of the reduced form links electron movement with changes in proton distribution across the membrane. That coupling contributes to the proton gradient, which connects redox reactions with downstream cellular energy production.
Protein complexes provide the organized sites for electron-transfer reactions, whereas the quinone acceptor acts as a mobile redox carrier between those sites. It receives electrons from one component, can carry them in a reduced quinol state, and transfers them to another carrier or enzyme. This division of roles helps coordinate sequential electron flow.
Studies can focus on the acceptor's reversible change between quinone and quinol, its movement of electrons between protein complexes, and its relationship to proton-gradient formation. Examining these linked events helps researchers connect molecular redox behavior with larger outcomes, including oxidation-reduction balance and the conversion of chemical energy into usable cellular energy.
Quinone acceptors participate in membrane-associated electron-transfer pathways in both respiration and photosynthesis. In each context, their shuttle function helps connect protein complexes and coordinate the movement of reducing equivalents with proton-gradient formation. This makes them relevant for understanding how different biological energy-conversion systems support ATP production and related cellular processes.