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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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関連する実験動画

Updated: Jun 13, 2026

Quantitative Proteomics Using Reductive Dimethylation for Stable Isotope Labeling
11:53

Quantitative Proteomics Using Reductive Dimethylation for Stable Isotope Labeling

Published on: July 1, 2014

16.3K

固体相互換のシラン基割れ式リンクは,カスタムイソバリック定量化学タンパク質を可能にします.

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
まとめ
この要約は機械生成です。

新しい化学プロテオミクスを開発しました シラン基の分裂性同位体ラベルプロテオミクス (sCIP) です 機能生物学と薬の発見を 改善するためです この方法は,サンプル準備の効率を高め,エレクトロフィールとして作用するFCCPのような新しいシステイン-リガンド相互作用を特定します.

さらに関連する動画

A Quantitative Glycomics and Proteomics Combined Purification Strategy
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A Quantitative Glycomics and Proteomics Combined Purification Strategy

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Insights into the Interactions of Amino Acids and Peptides with Inorganic Materials Using Single-Molecule Force Spectroscopy
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Insights into the Interactions of Amino Acids and Peptides with Inorganic Materials Using Single-Molecule Force Spectroscopy

Published on: March 6, 2017

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関連する実験動画

Last Updated: Jun 13, 2026

Quantitative Proteomics Using Reductive Dimethylation for Stable Isotope Labeling
11:53

Quantitative Proteomics Using Reductive Dimethylation for Stable Isotope Labeling

Published on: July 1, 2014

16.3K
A Quantitative Glycomics and Proteomics Combined Purification Strategy
11:38

A Quantitative Glycomics and Proteomics Combined Purification Strategy

Published on: March 8, 2016

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Insights into the Interactions of Amino Acids and Peptides with Inorganic Materials Using Single-Molecule Force Spectroscopy
05:44

Insights into the Interactions of Amino Acids and Peptides with Inorganic Materials Using Single-Molecule Force Spectroscopy

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科学分野:

  • プロテオミクス
  • 化学生物学
  • 薬物の発見

背景:

  • 質量スペクトロメトリーに基づく化学タンパク質学は 機能生物学と薬剤発見に不可欠です
  • 現存する方法は,試料の合成と試料の準備のスループットで課題に直面しています.

研究 の 目的:

  • 新しい化学プロテオミクスのワークフローを確立し,現在の制限を克服するために,シランベースの割れる同位体ラベルプロテオミクスを (sCIP) 確立する.
  • タンパク質とリガンドの相互作用を特定するために,高通量で効率的なサンプル準備と分析を可能にします.

主な方法:

  • ディアルコキシディフェニルシラン フロレンリメチロキシカルボニル (DADPS-Fmoc) 保護されたアミノ酸のスケーラブルな合成を開発した.
  • カスタマイズ可能な,同位体で標識され,化学的に割れるバイオチン捕獲反応剤を作成しました.
  • MS1/MS2定量化によるsCIPが実装され,早期のラベリングとプーリングのためのクリックアセンブリされた同位体タグが搭載され,シックスプレックスマルチプレクスを可能にします.

主要な成果:

  • sCIP方法はサンプル準備を効率化し,スループットとデータカバーを増加させます.
  • sCIPは,FragPipe分析と組み合わせて,既知のシステイン-リガンドのペアと新しいペアを特定した.
  • ミトコンドリア解離剤FCCPが共性逆性システイン反応性電化剤として機能することを発見した.

結論:

  • sCIP方法は,化学プロテオミクスのための堅牢で効率的なプラットフォームを提供します.
  • このアプローチは,システイン-リガンドの相互作用の包括的な識別を可能にすることによって,機能生物学と薬剤発見を前進させる.
  • FCCPはシステインに反応する新鮮な作用メカニズムを示している.