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相关概念视频

Water: A Bronsted-Lowry Acid and Base02:30

Water: A Bronsted-Lowry Acid and Base

The reaction between a Brønsted-Lowry acid and water is called acid ionization. For example, when hydrogen fluoride dissolves in water and ionizes, protons are transferred from hydrogen fluoride molecules to water molecules, yielding hydronium ions and fluoride ions:
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):
Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Mechanism01:13

Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Mechanism

Carboxylic acids react with alcohols to yield esters via an acid-catalyzed condensation reaction called Fischer esterification. This is a nucleophilic acyl substitution reaction that proceeds via a tetrahedral intermediate, where a water molecule is eliminated as the leaving group.
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...
Composition of Polyprotic Acid Solutions as a Function of pH01:19

Composition of Polyprotic Acid Solutions as a Function of pH

Polyprotic acids of the type H2M constitute two ionizable protons. As a result, on titration with a base, they exhibit two equivalence points in the titration curve. During titration, the species H2M, HM−, and M2− will be present in the solution at different points. The fractions of H2M, HM−, and M2− present at the various instances of the titration are denoted by α0, α1, and α2, respectively.
A graph with the alpha values is plotted against the volume of base added during titration. Here, a...
Extraction: Effects of pH00:53

Extraction: Effects of pH

Consider a neutral form of an amine, B, with a partition coefficient, K, in a liquid mixture containing organic and aqueous phases. The pH of the aqueous phase affects the charge on acidic and basic solutes, and the charged form is usually more soluble in the aqueous phase. Suppose the conjugate acid form of the amine is soluble only in the aqueous phase while the base form is soluble in both phases. Then the distribution coefficient, D, can be given as the ratio of amine concentration in the...

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基于Fmoc结合二的水凝及其可调节pH的行为.

Soumen Kuila1, Souvik Misra1, Riya Saha2

  • 1Department of Chemistry, University of North Bengal, Raja Rammohanpur, Siliguri, West Bengal 734013, India. jayanta@nbu.ac.in.

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概括

研究人员开发了新的基于的水凝器. 基于谷氨酸的水凝器 (FQ) 与基于酸 (FD) 和谷氨酸 (FE) 的水凝器相比,显示出更高的凝效率和自我组装能力.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 生物化学 生化学
  • 超分子化学 超分子化学

背景情况:

  • 基于的水凝是有前途的生物材料.
  • 设计具有可调节性质的水凝器对于应用至关重要.

研究的目的:

  • 设计和评估基于二的新型水凝器.
  • 为了研究Fmoc-phenylalanine dipeptides与不同氨基酸侧链的自我组装和凝行为.

主要方法:

  • 合成了三种基于二的水凝器:Fmoc-Phe-Gln (FQ),Fmoc-Phe-Asp (FD) 和Fmoc-Phe-Glu (FE). 这三种水凝器的合成方法.
  • 在酸盐缓冲溶液中研究自我组装和凝.
  • 使用提奥夫拉-T结合,分子动力学,光光谱学,FT-IR光谱学,扫描电子显微镜和风湿学进行表征.

主要成果:

  • 与FD和FE相比,FQ在中性pH下表现出更高的凝效率和动力学.
  • 降低pH值增强了所有水凝器的凝,这是由于碳酸基的质子化.
  • 提奥夫拉-T测定表明β-片状结构的形成.
  • 分子动力学模拟显示,FQ的聚合趋势较高.
  • 鉴定证实了基于的可注射生物材料的形成.

结论:

  • 基于谷氨胺的水凝器 (FQ) 显示了增强的自组装和凝特性.
  • pH值显著影响具有可电离侧链的水凝器的凝效率.
  • 这些基于的水凝器是可注射生物材料的有希望的候选者.