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The Hydrophilic-lipophilic balance of a surfactant is a measure of the degree to which it is hydrophilic or lipophilic, determined by calculating values for the different regions of the molecule, as described by Griffin in 1949 and 1954. Other methods have been suggested, notably in 1957 by Davies.
Additional recommended knowledge
Griffin's method for non-ionic surfactants as described in 1954 works as follows:
HLB = 20 * Mh / M
where Mh is the molecular mass of the hydrophilic portion of the Molecule, and M is the molecular mass of the whole molecule, giving a result on an arbitrary scale of 0 to 20. An HLB value of 0 corresponds to a completely hydrophobic molecule, and a value of 20 would correspond to a molecule made up completely of hydrophilic components.
The HLB value can be used to predict the surfactant properties of a molecule:
In 1957, Davies suggested a method based on calculating a value based on the chemical groups of the molecule. The advantage of this method is that it takes into account the effect of strongly and less strongly hydrophilic groups. The method works as follows:
HLB = 7 + m * Hh + n * Hl
m - number of hydrophilic groups in the molecule
Hh - Value of the hydrophilic groups
n - Number of lipophilic groups in the molecule
Hl - Value of the lipophilic groups
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Hydrophilic-lipophilic_balance". A list of authors is available in Wikipedia.|