Hydrotrope

Hydrotrope

A hydrotrope is a compound that solubilises hydrophobic compounds in aqueous solutions. Typically, hydrotropes consist of a hydrophilic part and a hydrophobic part (like surfactants) but the hydrophobic part is generally too small to cause spontaneous self-aggregation.
Hydrotropes do not have a critical concentration above which self-aggregation 'suddenly' starts to occur (as found for micelle- and vesicle-forming surfactants, which have a critical micelle concentration or cmc and a critical vesicle concentration or cvc, respectively). Instead, some hydrotropes aggregate in a step-wise self-aggregation process, gradually increasing aggregation size. However, many hydrotropes do not seem to self-aggregate at all, unless a solubilisate has been added. Hydrotropes are in use industrially. Hydrotropes are used in detergent formulations to allow more concentrated formulations of surfactants. Examples of hydrotropes include sodium p-toluenesulfonate and sodium xylene sulfonate.


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  • Hydrotrope — Hy dro*trope, n. [Hydro , 1 + Gr. ? to turn, direct.] A device for raising water by the direct action of steam; a pulsometer. [1913 Webster] …   The Collaborative International Dictionary of English

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  • hydrotrope — hy·dro·trope …   English syllables

  • hydrotrope — ˈhīdrə.ˌtrōp noun ( s) Etymology: back formation from hydrotropic : a hydrotropic substance …   Useful english dictionary

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