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Related Concept Videos

Solvents01:12

Solvents

71.9K
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.
A...
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Solubility03:00

Solubility

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Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules,...
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Theories of Dissolution: Diffusion Layer Model01:15

Theories of Dissolution: Diffusion Layer Model

2.0K
Dissolution, the process by which drug particles dissolve in a solvent, is explained by the diffusion layer model, a theoretical framework that simulates the absorption of oral drugs and allows us to analyze experimental data.
This process starts with a thin layer, saturated with the drug, forming at the interface between the solid and liquid. The solute then diffuses from this layer into the main solution. The Noyes-Whitney equation suggests that the rate of dissolution relies on the diffusion...
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Entropy and Solvation02:05

Entropy and Solvation

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The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
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Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model

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Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
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Osmosis and Osmotic Pressure of Solutions02:40

Osmosis and Osmotic Pressure of Solutions

48.4K
A number of natural and synthetic materials exhibit selective permeation, meaning that only molecules or ions of a certain size, shape, polarity, charge, and so forth, are capable of passing through (permeating) the material. Biological cell membranes provide elegant examples of selective permeation in nature, while dialysis tubing used to remove metabolic wastes from blood is a more simplistic technological example. Regardless of how they may be fabricated, these materials are generally...
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Transition of Solvent Interaction Research from Basic Science to Applied Science.

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Basic research on protein-solvent interactions, including gluten aggregation and solubility (Hofmeister series), unexpectedly advanced industrial applications in biotechnology, demonstrating the value of fundamental science.

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Area of Science:

  • Biochemistry and Biophysics
  • Protein Science
  • Solution Chemistry

Background:

  • Investigated gluten aggregation induced by pH and ionic strength changes.
  • Focused on protein-solvent interactions, including solubility phenomena like the Hofmeister series.
  • Explored the fundamental impact of various solvents on protein behavior in solution.

Purpose of the Study:

  • To understand the aggregation behavior of wheat protein gluten.
  • To elucidate the effects of different solvents on protein behavior and solubility.
  • To explore the practical applications of basic research in protein-solvent interactions.

Main Methods:

  • Studied gluten aggregation under varying pH and ionic strength.
  • Analyzed protein-solvent interactions and solubility.
  • Applied findings to protein refolding, formulation, and chromatography.

Main Results:

  • Characterized gluten aggregation mechanisms.
  • Provided insights into the Hofmeister series and solvent effects on protein solubility.
  • Demonstrated the transition of basic science findings to industrial biotechnology applications.

Conclusions:

  • Fundamental research on protein-solvent interactions, though initially unfunded, has significant industrial relevance.
  • Knowledge of solvent effects is crucial for protein refolding, formulation, and chromatography in biotech.
  • Basic scientific inquiry can lead to unanticipated, high-impact applied solutions.