Re: Amphipathic dye reccomendation?

"michalchik@xxxxxxx" wrote:

Hi, I am a high school science teacher. I am looking for a dye that
will dissolve in water (to some extent) but them segregate to an
immiscible oil layer. I intend on using this to illustrate
lipophilicity, how the properties of molecules effect their
macroscopic behavior, and later the formation of a dispersion and
micelles once I add a surfactant. I need a dye that I can get or make
from stuff available at common retail stores.

Carotenoids are normally not very water soluble,
but they most certainly have some solubility.
When I've made flavored vinegars from chili peppers,
the vinegar becomes strongly colored. I haven't
tried extracting the color into an oil layer,
but I expect it would extract to some significant
degree.

Lutein is the red color in bell and chili peppers,
and beta-carotene is the orange color.

It might be worth combining this demonstration
with a demonstration of paper chromatography.
.

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