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Related Concept Videos

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Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...
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The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
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Updated: Mar 8, 2026

Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions
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Salt disproportionation: A material science perspective.

Naveen K Thakral1, Ron C Kelly1

  • 1Materials Chemistry and Characterization, Drug Product Technologies, Amgen Inc., One Amgen Center Drive, Thousand Oaks, CA 91320, United States.

International Journal of Pharmaceutics
|February 7, 2017
PubMed
Summary
This summary is machine-generated.

Drug salt disproportionation can impact physical stability and shelf life. Understanding pH, buffering, and using predictive tools aids in selecting stable counter-ions and preventing formulation issues.

Keywords:
DisproportionationDissolutionExcipientsMicroenvironmental pHPHmaxSaltpKa

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Area of Science:

  • Pharmaceutical Science
  • Physical Chemistry
  • Drug Development

Background:

  • Salt selection for active pharmaceutical ingredients (APIs) is critical for formulation stability.
  • Uncertainty exists regarding salt disproportionation, affecting drug product shelf life.
  • Disproportionation can lead to dissolution failure and reduced drug efficacy.

Purpose of the Study:

  • To provide a mechanistic understanding of salt disproportionation reactions.
  • To evaluate the implications of disproportionation on drug product performance.
  • To discuss predictive tools and mitigation strategies for salt disproportionation.

Main Methods:

  • Review of disproportionation reaction examples.
  • Explanation of pHmax, microenvironmental pH, and buffering capacity.
  • Evaluation of predictive tools (mathematical models, model-free kinetics).
  • Discussion of analytical methods and mitigation strategies.

Main Results:

  • Disproportionation is influenced by pH, buffering capacity, and excipient interactions.
  • Predictive tools can rank counter-ions for stability during early development.
  • Analytical methods are crucial for early detection of disproportionation.

Conclusions:

  • Understanding disproportionation mechanisms is key to ensuring drug product stability.
  • Proactive use of predictive tools and analytical methods prevents formulation failures.
  • Effective counter-ion selection and stability assessment are vital for drug development.