Abstract
In Cosmetics using powders, topnote and retention of perfume are important problems. These problems depend on adsorptive properties of odoriferous substances adsorbed on powders. Adsorption of limonene on inorganic powders that are for cosmetics such as titanium dioxide, talc, zinc oxide, calcium carbonate magnesium carbonate, and silicic acid anhydride, is measured by an adsorption measurement apparatus attached to a gas liquid partition chromatograph.
Total amount of limonene adsobed on 9 kinds of inorganic powders is calculated by using Langmuir's adsorption isothermal equation subject to the continuous flow method.
Irreversible adsorption is measured by pulse method, and from difference of this value and total amount of limonene adsorbed, reversible adsorption is determined.
Results are as follows; 1) magnesium carbonate has the largest amount of adsorption and most of the adsorption is reveresible one, on the other hand, calctum carbonate the smallest adsorption value, 2) in the amount of irreversible adsorption of titanium dioxide, anatase has 10 times larger value than that of rutile, 3) in silicic acid anhydride, most of the adsorption is irreversible.
From these results, retention of perfume of powder products and the possibility of a simple test method are discussed.
