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Related Concept Videos

Buffers02:56

Buffers

173.4K
A solution containing appreciable amounts of a weak conjugate acid-base pair is called a buffer solution, or a buffer. Buffer solutions resist a change in pH when small amounts of a strong acid or a strong base are added. A solution of acetic acid and sodium acetate is an example of a buffer that consists of a weak acid and its salt: CH3COOH (aq) + CH3COONa (aq). An example of a buffer that consists of a weak base and its salt is a solution of ammonia and ammonium chloride: NH3 (aq) + NH4Cl...
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Buffers: Buffer Capacity01:09

Buffers: Buffer Capacity

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Buffer capacity is the quantitative measure of a buffer to resist the change in pH. As shown in the following equation, the buffer capacity, denoted by 'beta', is expressed as the number of moles of acid or base needed to change the pH of a one-liter buffer solution by 1 unit. Here, Ca and Cb indicate the number of moles of acid and base, respectively. Note that dpH represents the change in pH.
In the graph, pH is plotted as a function of the number of moles of base (Cb) added to a weak...
2.5K
Buffer Effectiveness02:19

Buffer Effectiveness

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Buffer solutions do not have an unlimited capacity to keep the pH relatively constant . Instead, the ability of a buffer solution to resist changes in pH relies on the presence of appreciable amounts of its conjugate weak acid-base pair. When enough strong acid or base is added to substantially lower the concentration of either member of the buffer pair, the buffering action within the solution is compromised.
The buffer capacity is the amount of acid or base that can be added to a given volume...
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Protein-protein Interfaces02:04

Protein-protein Interfaces

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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
14.8K
Phosphate Buffer01:22

Phosphate Buffer

5.4K
The phosphate buffer system is a critical biological mechanism for maintaining pH stability in the body. This system operates primarily through two components: sodium dihydrogen phosphate (NaH2PO4), which acts as a weak acid, and sodium hydrogen phosphate (Na2HPO4), which serves as a weak base.
Sodium dihydrogen phosphate does not fully dissociate in neutral or acidic solutions. When a strong base, such as sodium hydroxide (NaOH), is introduced into the solution, sodium dihydrogen phosphate...
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Buffers: Overview01:30

Buffers: Overview

10.2K
Buffers play a crucial role in stabilizing the pH of a solution by mitigating the effects of small amounts of added acid or base. They consist of a weak acid and its conjugate base or a weak base and its conjugate acid. A solution of acetic acid and sodium acetate is an example of a buffer that consists of a weak acid and its salt: CH3COOH (aq) + CH3COONa (aq). An example of a buffer that consists of a weak base and its salt is a solution of ammonia and ammonium chloride: NH3 (aq) + NH4Cl (aq).
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Culturing of Human Nasal Epithelial Cells at the Air Liquid Interface
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The interaction between BSA and DOTAP at the air-buffer interface.

Guoqing Xu1, Changchun Hao2, Lei Zhang1

  • 1School of Physics and Information Technology, Shaanxi Normal University, Xi'an, 710062, China.

Scientific Reports
|January 12, 2018
PubMed
Summary
This summary is machine-generated.

The interaction between bovine serum albumin (BSA) and DOTAP lipid layers depends on pH. Optimal conditions at pH 10 allow BSA purification from mixtures, crucial for biosensor development.

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Area of Science:

  • Biophysical Chemistry
  • Surface Science
  • Biomolecular Interactions

Background:

  • Bovine serum albumin (BSA) is a key protein in biological systems.
  • Cationic lipids like DOTAP are used in drug delivery and gene therapy.
  • Understanding protein-lipid interactions is vital for biomaterial design and biosensing.

Purpose of the Study:

  • To investigate the interaction between BSA and DOTAP at the air-buffer interface.
  • To determine how subphase pH affects this interaction.
  • To explore the potential for BSA separation and purification using this system.

Main Methods:

  • Surface pressure (π-A) measurements to analyze adsorption isotherms.
  • Penetration kinetics (π-t) to study dynamic behavior.
  • Atomic Force Microscopy (AFM) to visualize monolayer morphology and adsorption.

Main Results:

  • BSA adsorption onto DOTAP monolayers is concentration-dependent, reaching a threshold.
  • BSA desorbs from the monolayer over time.
  • Subphase pH significantly influences the BSA-DOTAP interaction mechanism.
  • At pH 10, a combination of hydrophobic and electrostatic interactions facilitates BSA adsorption, enabling purification.

Conclusions:

  • The pH of the subphase is a critical factor modulating BSA-DOTAP interactions at the air-buffer interface.
  • The findings support the use of BSA-DOTAP systems for efficient separation and purification of biomolecules.
  • This research provides a foundation for developing advanced biosensors and biomaterials.