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Related Concept Videos

Buffer Systems in the Body01:19

Buffer Systems in the Body

Chemical buffers play a critical role in the body's regulation of pH levels. These systems contain one or more compounds that stabilize pH changes by neutralizing strong acids or bases. When pH levels drop, hydrogen ions bind to a weak base; when pH levels rise, hydrogen ions are released. This dynamic process helps maintain pH within a narrow and stable range essential for normal physiological function.
A typical buffer system in bodily fluids includes a weak acid and its corresponding anion,...
Buffers02:56

Buffers

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...
Phosphate Buffer01:22

Phosphate Buffer

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...
Protein Buffers in Blood Plasma and Cells01:20

Protein Buffers in Blood Plasma and Cells

The human body utilizes protein buffer systems to maintain a stable pH. These systems capitalize on the dual role of amino acids, which can act as acids or bases by accepting or releasing hydrogen ions in response to pH changes. Protein buffer systems are particularly significant in the extracellular fluid (ECF) and intracellular fluid (ICF) of active cells, where structural and functional proteins provide substantial buffering capacity.
Certain amino acids can exist in a zwitterion state at a...
Buffers: Overview01:30

Buffers: Overview

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).
Buffer Effectiveness02:19

Buffer Effectiveness

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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Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer
10:11

Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer

Published on: April 19, 2021

Thermally programmable pH buffers.

Dara Van Gough1, Bruce C Bunker, Mark E Roberts

  • 1Electronic, Optical, and Nanostructures, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA. dgough@sandia.gov

ACS Applied Materials & Interfaces
|November 8, 2012
PubMed
Summary
This summary is machine-generated.

Researchers developed thermally programmable pH buffer systems using copolymers that change pH with temperature. These systems offer precise control over proton and hydroxide ion concentrations for chemical and biological reactions.

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Area of Science:

  • Polymer Chemistry
  • Biophysical Chemistry
  • Materials Science

Background:

  • Precise control of proton (H+) and hydroxide (OH-) ion concentrations is crucial for many chemical and biological reactions.
  • Existing pH buffer systems may lack dynamic control or responsiveness to external stimuli.
  • Developing adaptable buffer systems can enhance reaction efficiency and enable new experimental designs.

Purpose of the Study:

  • To investigate the behavior of thermally programmable pH buffer systems.
  • To explore the use of copolymers of acrylic acid (AA) and N-isopropylacrylamide for pH control.
  • To understand how temperature-induced phase transitions affect buffer performance.

Main Methods:

  • Copolymerization of varying amounts of acrylic acid (AA) into N-isopropylacrylamide polymers.
  • Characterization of copolymer phase transitions upon heating and cooling.
  • Measurement of solution pH changes in response to temperature variations.
  • Analysis of the influence of AA content and neutralization degree on pH modulation.

Main Results:

  • The synthesized copolymers exhibit thermally induced phase transitions, altering the local environment around AA groups.
  • Moderate temperature changes (heating/cooling) reversibly switch the local environment between hydrophobic and hydrophilic states.
  • These environmental changes significantly affect the ionization of AA groups, leading to pH modulation.
  • Solution pH could be adjusted by up to two pH units through temperature variations.
  • The effectiveness of pH control is dependent on the acrylic acid content and the degree of neutralization.

Conclusions:

  • Thermally programmable pH buffer systems based on N-isopropylacrylamide-acrylic acid copolymers are feasible.
  • Temperature-induced phase transitions provide a mechanism for dynamic and reversible pH control.
  • The performance of these buffer systems is tunable by adjusting copolymer composition and neutralization.
  • These systems offer potential for advanced applications in chemistry and biology requiring precise pH management.