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Mass Spectrometry: Isotope Effect01:13

Mass Spectrometry: Isotope Effect

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Most elements exist in nature as a mixture of isotopes. The isotopes differ in weight due to their respective number of neutrons. The molecular weight of a molecule is different depending on the specific isotope of its elements involved. As a result, the mass spectrum of the molecule exhibits peaks from the same fragment at multiple positions. The positions of these mass signals depend on the difference between the molecular mass. Furthermore, the intensity of these signals is dependent on the...
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Enzyme Kinetics01:19

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Enzymes speed up reactions by lowering the activation energy of the reactants. The speed at which the enzyme turns reactants into products is called the rate of reaction. Several factors impact the rate of reaction, including the number of available reactants. Enzyme kinetics is the study of how an enzyme changes the rate of a reaction.
Scientists typically study enzyme kinetics with a fixed amount of enzyme in the controlled environment of a test tube. When more reactant, or substrate, is...
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Introduction to Enzyme Kinetics01:19

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Enzyme kinetics studies the rates of biochemical reactions. Scientists monitor the reaction rates for a particular enzymatic reaction at various substrate concentrations. Additional trials with inhibitors or other molecules that affect the reaction rate may also be performed.
The experimenter can then plot the initial reaction rate or velocity (Vo) of a given trial against the substrate concentration ([S]) to obtain a graph of the reaction properties. For many enzymatic reactions involving a...
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Isotopes01:12

Isotopes

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Elements have a set number of protons that determines their atomic number (Z). For example, all atoms with eight protons are oxygen; however, the number of neutrons can vary for atoms of the same element. The sum of the number of protons and the number of neutrons is the mass number (A). Atoms with the same atomic number but different mass numbers are called isotopes. Elements can have multiple isotopes, for example, carbon-12, carbon-13, and carbon-14.
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Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical...
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Steady-state, Pre-steady-state, and Single-turnover Kinetic Measurement for DNA Glycosylase Activity
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Efectos precisos de isótopos cinéticos de una sola molécula

Yilin Guo1, Chen Yang1, Huiping Li2

  • 1Beijing National Laboratory for Molecular Sciences, National Biomedical Imaging Center, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People's Republic of China.

Journal of the American Chemical Society
|January 17, 2022
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Los efectos de isótopos cinéticos de una sola molécula (sm-KIE) que utilizan uniones de grafeno rastrean con precisión las reacciones químicas. Este método revela las estructuras de estado de transición y la dinámica de reacción, avanzando la comprensión química y la optimización.

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Área de la Ciencia:

  • Dinámica Química
  • Estudios de una sola molécula
  • Ciencias de la superficie

Sus antecedentes:

  • Los métodos convencionales de efecto de isótopos cinéticos (KIE) están limitados por el promedio de conjunto.
  • Las técnicas de molécula única ofrecen una mayor resolución para estudiar los mecanismos de reacción.
  • Las uniones basadas en grafeno proporcionan una plataforma para la manipulación y observación molecular precisa.

Objetivo del estudio:

  • Desarrollar y aplicar un método preciso de efecto isotópico cinético de una sola molécula (sm-KIE).
  • Para superar las limitaciones de las mediciones KIE convencionales.
  • Para sondear la dinámica de las reacciones químicas y las estructuras de estado de transición (TS) a nivel de una sola molécula.

Principales métodos:

  • Fabricación de uniones de una sola molécula de grafeno y molécula de grafeno.
  • Monitoreo en tiempo real de las trayectorias de reacción de una sola molécula.
  • Aplicación del sm-KIE para estudiar el reordenamiento de Claisen.

Principales resultados:

  • Se observa la escisión del enlace C-O y la formación del enlace C-C en el estado de transición del reordenamiento de Claisen.
  • Se ha demostrado una alta sensibilidad de detección y precisión del método sm-KIE.
  • Estructuras de estado de transición determinadas bajo campos eléctricos variables, que revelan una regulación multidimensional.

Conclusiones:

  • sm-KIE es una herramienta poderosa para caracterizar la dinámica de la reacción y los estados de transición.
  • Este método proporciona conocimientos más profundos que el conjunto KIE convencional.
  • La detección y la manipulación de los estados de transición ofrecen nuevas vías para optimizar las reacciones químicas y los procesos biomiméticos.