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Determining the Solubility Rules of Ionic Compounds09:09

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An ionic compound's solubility can be determined via qualitative analysis. Qualitative analysis is a branch of analytical chemistry that uses chemical properties and reactions to identify the cation or anion present in a chemical compound. While the chemical reactions rely on known solubility rules, those same rules can be determined by identifying the products that form. Qualitative analysis is...
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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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When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
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Determining the Solubility Rules of Ionic Compounds
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Acyclovir as an Ionic Liquid Cation or Anion Can Improve Aqueous Solubility.

Julia L Shamshina1,2, O Andreea Cojocaru2, Steven P Kelley3

  • 1525 Solutions, Inc., 720 2nd Street, Tuscaloosa, Alabama 35401, United States.

ACS Omega
|August 29, 2019
PubMed
Summary

New ionic liquids (ILs) incorporating acyclovir show significantly enhanced aqueous and simulated body fluid solubilities compared to neutral acyclovir. Solubility can be tuned by selecting appropriate counterions for acyclovir-based ILs.

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Area of Science:

  • Pharmaceutical Chemistry
  • Materials Science
  • Drug Delivery

Background:

  • Acyclovir is a crucial antiviral medication with limited aqueous solubility.
  • Ionic liquids (ILs) offer tunable physicochemical properties for pharmaceutical applications.
  • Enhancing drug solubility is key to improving bioavailability and therapeutic efficacy.

Purpose of the Study:

  • To synthesize novel acyclovir-based ionic liquids (ILs).
  • To evaluate the aqueous and simulated body fluid solubilities of these new ILs.
  • To explore the potential of ILs for improving acyclovir's solubility profile.

Main Methods:

  • Synthesis of six acyclovir-containing ionic compounds using various cation and anion pairings.
  • Characterization of synthesized compounds, classifying five as ionic liquids.
  • Measurement of aqueous solubility and solubility in simulated body fluids (PBS, SGF, SIF).

Main Results:

  • Five novel acyclovir-based ionic liquids were successfully synthesized.
  • All synthesized acyclovir ILs demonstrated at least a two-order-of-magnitude increase in aqueous solubility compared to neutral acyclovir.
  • Solubilities in phosphate-buffered saline, simulated gastric, and simulated intestinal fluids were significantly enhanced for three compounds.

Conclusions:

  • Acyclovir-based ionic liquids represent a promising strategy for enhancing drug solubility.
  • The choice of counterion significantly influences the solubility of acyclovir ILs.
  • Anionic acyclovir forms appear to yield higher solubilities than cationic forms.