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Dehydration Synthesis01:15

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Overview
Dehydration synthesis (also called a condensation reaction) is the chemical process in which two molecules covalently link together to form a new molecule, along with the release of a water molecule. Many physiologically important compounds form by dehydration synthesis reactions, such as complex carbohydrates, proteins, DNA, and RNA.
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Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism01:21

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Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
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Dehydration, dissolution, and melting of cyclodextrin crystals.

Erika Specogna1, King Wo Li, Madeleine Djabourov

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This study reveals distinct water binding sites in hydrated cyclodextrin crystals using thermogravimetric analysis. Microcalorimetry determined solubility limits and melting points, differentiating cyclodextrin types.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Cyclodextrins are toroidal oligosaccharides with internal cavities capable of encapsulating guest molecules.
  • Water is a key guest molecule in cyclodextrin crystals, influencing their structure and stability.
  • Despite internal water, cyclodextrins offer a hydrophobic environment suitable for poorly soluble compounds.

Purpose of the Study:

  • To characterize different types of water within hydrated alpha-, beta-, and gamma-cyclodextrin crystals.
  • To investigate the influence of humidity on water binding sites.
  • To determine the solubility limits, melting temperatures, and associated enthalpies of hydrated cyclodextrin crystals.

Main Methods:

  • Thermogravimetric measurements to identify water binding sites and assess effects of humidity.
  • Microcalorimetry to establish solubility curves (temperature dependence) and measure melting temperatures.
  • Analysis of dissolution and melting enthalpies.

Main Results:

  • Distinct water binding sites were identified in hydrated alpha-, beta-, and gamma-cyclodextrin crystals.
  • Thermogravimetric analysis showed differences in water binding based on equilibration humidity.
  • Solubility limits and melting temperatures of hydrated crystals were determined for the first time, with derived enthalpies.
  • Specific characteristics of each cyclodextrin type were highlighted.

Conclusions:

  • Hydrated cyclodextrin crystals exhibit varied water populations with distinct binding characteristics.
  • Humidity significantly impacts water incorporation and binding within cyclodextrin structures.
  • The study provides novel data on the thermal behavior and solubility of hydrated cyclodextrins, differentiating their properties.