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Videos de Conceptos Relacionados

Relative Strengths of Conjugate Acid-Base Pairs02:29

Relative Strengths of Conjugate Acid-Base Pairs

Brønsted-Lowry acid-base chemistry is the transfer of protons; thus, logic suggests a relation between the relative strengths of conjugate acid-base pairs. The strength of an acid or base is quantified in its ionization constant, Ka or Kb, which represents the extent of the acid or base ionization reaction. For the conjugate acid-base pair HA / A−, the ionization equilibrium equations and ionization constant expressions are
Titration Calculations: Strong Acid - Strong Base02:28

Titration Calculations: Strong Acid - Strong Base

Calculating pH for Titration Solutions: Strong Acid/Strong Base
A titration is carried out for 25.00 mL of 0.100 M HCl (strong acid) with 0.100 M of a strong base NaOH. The pH at different volumes of added base solution can be calculated as follows:
(a) Titrant volume = 0 mL. The solution pH is due to the acid ionization of HCl. Because this is a strong acid, the ionization is complete and the hydronium ion molarity is 0.100 M. The pH of the solution is then:
Leveling Effect and Non-Aqueous Acid-Base Solutions02:11

Leveling Effect and Non-Aqueous Acid-Base Solutions

This lesson defines the leveling effect in acidic and basic solutions and its role in aqueous and non-aqueous solutions. It is essential to understand the competing nature of various species in a chemical system.
The Leveling Effect of a Solvent
A generic acid (HA) reacts with the generic base (B-) to yield the corresponding conjugate base (A-) and conjugate acid (HB):
Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
Titration of Polyprotic Base with a Strong Acid01:18

Titration of Polyprotic Base with a Strong Acid

The titration of a polyprotic base such as sodium carbonate with a strong acid such as hydrochloric acid results in two equivalence points on the titration curve. At the first equivalence point, the carbonate ions in the base are completely converted to bicarbonate ions. The second equivalence point corresponds to the complete conversion of bicarbonate ions to carbonic acid, which dissociates into carbon dioxide and water. The region before the first equivalence point corresponds to the...
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...

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Updated: Jun 13, 2026

Quantitative Proteomics Using Reductive Dimethylation for Stable Isotope Labeling
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El enlace cleable basado en silano compatible con la fase sólida permite la quimioproteómica cuantitativa isobárica

Nikolas R Burton1,2, Daniel A Polasky3, Flowreen Shikwana1,2

  • 1Department of Biological Chemistry, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California 90095, United States.

Journal of the American Chemical Society
|September 22, 2023
PubMed
Resumen
Este resumen es generado por máquina.

Desarrollamos un nuevo método de quimioproteómica, proteómica etiquetada isotópica cleable a base de silano (sCIP), para mejorar la biología funcional y el descubrimiento de fármacos. Este método mejora la eficiencia de la preparación de muestras e identifica nuevas interacciones cisteína-ligando, como el FCCP que actúa como electrófilo.

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Área de la Ciencia:

  • Proteomía
  • Biología Química
  • Descubrimiento de drogas

Sus antecedentes:

  • La quimioproteómica basada en la espectrometría de masas es vital para la biología funcional y el descubrimiento de medicamentos.
  • Los métodos existentes se enfrentan a desafíos en la síntesis de reactivos y el rendimiento de la preparación de muestras.

Objetivo del estudio:

  • Establecer un nuevo flujo de trabajo de quimioproteómica, proteómica etiquetada isotópica (sCIP) a base de silano, para superar las limitaciones actuales.
  • Permitir una preparación y análisis de muestras eficientes y de alto rendimiento para la identificación de las interacciones proteína-ligando.

Principales métodos:

  • Desarrolló una síntesis escalable para los aminoácidos protegidos por dialcoxidifenilsilano fluorenilmetiloxicarbonilo (DADPS-Fmoc).
  • Se han creado reactivos de captura de biotina personalizables, etiquetados isotópicamente y químicamente clivantes.
  • Implementación de sCIP con cuantificación MS1/MS2, con etiquetas isobáricas ensambladas por clic para el etiquetado y la agrupación tempranos, lo que permite la multiplexación de seis plexos.

Principales resultados:

  • El método sCIP simplifica la preparación de muestras, aumentando el rendimiento y la cobertura de datos.
  • Junto con el análisis de FragPipe, sCIP identificó pares conocidos y nuevos de cisteína-ligando.
  • Se descubrió que el agente de desacoplamiento mitocondrial FCCP funciona como un electrófilo reactivo a la cisteína reversible por covalencia.

Conclusiones:

  • El método sCIP ofrece una plataforma robusta y eficiente para la quimioproteómica.
  • Este enfoque avanza en la biología funcional y el descubrimiento de fármacos al permitir una identificación completa de las interacciones cisteína-ligando.
  • Los hallazgos ponen de relieve el nuevo mecanismo de acción del FCCP como electrófilo reactivo a la cisteína.