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Factors Affecting Solubility04:01

Factors Affecting Solubility

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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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A decreasing function describes a relationship where the output consistently declines as the input increases. This means that for any two input values, if one is greater than the other, the corresponding output is smaller. Mathematically, a function f is decreasing on an interval I if for every x1 < x2​ in I, f (x1) > f (x2). This type of behavior is visually identified on a graph that slopes downward from left to right.The nature of a function can be analyzed by calculating...
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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.
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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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Although not a source of energy, cholesterol plays a significant role as a foundational structure for bile salts, steroid hormones, and vitamin D, as well as being a crucial component of plasma membranes. Approximately 15% of blood cholesterol is derived from our diet, with the remainder synthesized from acetyl CoA by the liver and intestines. Cholesterol is eliminated from the body through its conversion into bile salts, which are eventually discarded in the feces.
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Molecular Mechanism by Which Tea Catechins Decrease the Micellar Solubility of Cholesterol.

Takumi Sakakibara1, Yoshiharu Sawada2, Jilite Wang1

  • 1Graduate School of Natural Science and Technology , Gifu University , 1-1 Yanagido , Gifu 501-1193 , Japan.

Journal of Agricultural and Food Chemistry
|June 1, 2019
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Tea polyphenols, like (-)-epigallocatechin gallate (EGCg), reduce blood cholesterol by impacting micellar solubility. Molecular interactions reveal how EGCg and its derivatives inhibit cholesterol absorption.

Keywords:
catechincholesterolmicellar solubilitytaurocholic acidtea ()

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Pharmacology

Background:

  • Tea polyphenols are known to reduce blood cholesterol levels.
  • This effect is partly attributed to decreased cholesterol micellar solubility.
  • Understanding the molecular interactions involved is key to developing cholesterol absorption inhibitors.

Purpose of the Study:

  • To investigate the molecular interactions between taurocholic acid and (-)-epigallocatechin gallate (EGCg) and its derivatives.
  • To elucidate the mechanism by which tea polyphenols affect cholesterol micellar solubility.
  • To identify structural features of EGCg that influence its interaction with bile acids.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy (13C and 1H) was used to study molecular interactions.
  • Electrospray ionization-mass spectrometry (ESI-MS) was employed to determine complex stoichiometry.
  • Structure-activity relationships were explored using various (-)-EGCg derivatives.

Main Results:

  • 13C NMR indicated significant chemical-shift changes in the galloyl moiety of EGCg upon interaction with taurocholic acid.
  • 1H NMR studies revealed that the galloyl moiety's carbonyl carbon and aromatic ring are crucial for interaction, while B-ring hydroxylation has minimal effect.
  • The trans-configuration of the catechin moiety showed stronger inhibitory activity than the cis-configuration.
  • ESI-MS determined a 1:1 complex ratio between catechin and taurocholic acid.

Conclusions:

  • The interaction between tea polyphenols, specifically EGCg, and bile acids like taurocholic acid is mediated by the galloyl moiety and catechin configuration.
  • These findings provide molecular insights into the cholesterol-lowering mechanism of tea polyphenols.
  • The study supports the development of novel cholesterol-absorption inhibitors based on EGCg structure.