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A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
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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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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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Metabolic Glycoengineering of Sialic Acid Using N-acyl-modified Mannosamines
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Complejos de silicatos de azúcares en solución acuosa.

Joseph B Lambert1, Gang Lu, Stephanie R Singer

  • 1Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA. jlambert@northwestern.edu

Journal of the American Chemical Society
|August 5, 2004
PubMed
Resumen

Ciertos azúcares forman complejos de silicatos solubles con ácido silícico, pero sólo las formas específicas de furanosa reaccionan. Esta reacción selectiva, que involucra al grupo hidroxilo anómero, tiene implicaciones para la química prebiótica.

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Área de la Ciencia:

  • Química de los carbohidratos Química de los carbohidratos
  • Química de los silicatos en la química de los silicatos
  • Química prebiótica Química prebiótica es la química de los prebióticos.

Sus antecedentes:

  • Los azúcares pueden reaccionar con el ácido silícico para formar complejos de silicatos solubles.
  • La estructura del azúcar y su configuración son fundamentales para la formación de complejos.

Objetivo del estudio:

  • Investigar los requisitos estructurales para la formación de complejos azúcar-ácido silícico.
  • Comprender la selectividad de esta reacción y sus posibles implicaciones.

Principales métodos:

  • Se utilizó la espectroscopia de Resonancia Magnética Nuclear (RMN), específicamente (29) Si y (13) C RMN, para analizar los productos.
  • Estudió la reacción de varios monosacáridos y disacáridos con ácido silícico básico.

Principales resultados:

  • Solo las formas de azúcares de furanosa reaccionaron con el ácido silícico, formando quelatos 2/1 (azúcar/ácido silícico).
  • La reacción requiere que el grupo hidroxilo anómero sea cis a un grupo hidroxilo adyacente.
  • Los azúcares específicos como la ribosa, la xilosa y la fructosa formaron complejos, mientras que la glucosa y la galactosa no lo hicieron.

Conclusiones:

  • La formación de complejos de silicato de azúcar es altamente selectiva, dependiendo de la estructura del azúcar y la configuración del grupo hidroxilo.
  • El mecanismo de reacción implica la quelación a través de un anillo diolato de cinco miembros.
  • Esta selectividad puede desempeñar un papel en los procesos químicos prebióticos.