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Solubility of Ionic Compounds02:55

Solubility of Ionic Compounds

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Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
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Factors Affecting Solubility04:01

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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
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Solubility Equilibria03:07

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Solubility equilibria are established when the dissolution and precipitation of a solute species occur at equal rates. These equilibria underlie many natural and technological processes, ranging from tooth decay to water purification. An understanding of the factors affecting compound solubility is, therefore, essential to the effective management of these processes. This section applies previously introduced equilibrium concepts and tools to systems involving dissolution and precipitation.
The...
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Physical Properties Affecting Solubility02:19

Physical Properties Affecting Solubility

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Solutions of Gases in Liquids
As for any solution, the solubility of a gas in a liquid is affected by the attractive intermolecular forces between solute and solvent species. Unlike solid and liquid solutes, however, there is no solute-solute intermolecular attraction to overcome when a gaseous solute dissolves in a liquid solvent since the atoms or molecules comprising a gas are far separated and experience negligible interactions. Consequently, solute-solvent interactions are the sole...
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Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
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Solubility03:00

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Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
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Functionalized Spirocyclic Heterocycle Synthesis and Cytotoxicity Assay
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Spirocyclic Acetal-Modified Dextran as a Flexible pH-Sensitive Solubility-Switching Material.

Emily T Graham1, Kyle E Broaders1

  • 1Department of Chemistry , Mount Holyoke College , South Hadley , Massachusetts 01075 , United States.

Biomacromolecules
|April 3, 2019
PubMed
Summary
This summary is machine-generated.

New spirocyclic acetal-modified dextran (SpAc-Dex) polymers offer tunable pH-triggered degradation for drug delivery. These bioresponsive materials show promise for advanced biomedical applications due to their cytocompatibility.

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Area of Science:

  • Polymer Chemistry
  • Biomaterials Science
  • Drug Delivery Systems

Background:

  • Bioresponsive polymers are crucial for advanced drug delivery and medical materials.
  • Acetal-modified polysaccharides enable pH-triggered solubility switching, but previous research focused on limited acetal types.
  • Developing novel bioresponsive polymers with tunable properties is essential for improving therapeutic efficacy.

Purpose of the Study:

  • To prepare and characterize novel spirocyclic acetal-modified dextran (SpAc-Dex) polymers.
  • To investigate the impact of different cyclic acetal structures (cyclopentyl, cyclohexyl, cycloheptyl) on polymer properties.
  • To evaluate the degradability and cytocompatibility of these new materials for potential biomedical applications.

Main Methods:

  • Synthesis of spirocyclic acetal-modified dextran (SpAc-Dex) with varying acyclic and cyclic acetal contents.
  • Formation of organic-soluble materials into microparticles.
  • Assessment of microparticle degradability under varying conditions.
  • Evaluation of material cytocompatibility using standard assays.

Main Results:

  • Spirocyclic acetal modification (SpAc5-, SpAc6-, SpAc7-Dex) yielded dextran derivatives with tunable properties.
  • Degradation rates varied with acetal ring size: SpAc5-Dex degraded fastest, SpAc7-Dex slowest.
  • SpAc6-Dex exhibited a broad range of degradability despite lower substitution levels.
  • All synthesized SpAc-Dex materials demonstrated noncytotoxicity.

Conclusions:

  • Spirocyclic acetal-modified dextran (SpAc-Dex) represents a versatile platform for creating bioresponsive materials.
  • The tunable degradation profiles of SpAc-Dex polymers are suitable for controlled drug release applications.
  • These noncytotoxic materials hold significant potential for future development in biomedical fields, including drug delivery vehicles and tissue engineering.