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On the stability of Methyl Paraben:

Parabens are inactivated (partially or fully) by polysorbates and compounds like cellulose derivatives, proteins and lecithin. They also can be absorbed by many different clays or similar compounds.

Parabens are pH-dependent. The order of addition or the method parabens are added to formulations often determines if they will be inactivated.

For example, heating parabens in the water phase in an anionic emulsion will increase hydrolysis to the free acid. The free acid shows no activity at a pH above 6. As the pH increases, they dissociate into the salt (inactive) form. The highest pH with activity is about 8.

Iron ions will cause dissociation at lower pH's.

Parabens can be adsorbed by polyethylene containers. Parabens show no functionality in the oil phase of products.

Stability

Parabens are organic esters and are subject to saponification into para acid and

the corresponding alcohol. The conditions for this to occur are the combination of

temperature, pH and time

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