Stability of Urea in Cosmetic Formulations

Hi there,

I found out that is quite difficult to stabilize urea in cosmetic formulations. Sometimes it can lower the viscosity of emulsions and it also can increase the pH of the cosmetic system after some time, and above pH 7 sometimes there's liberation of ammonium. 

After some research I found out that is necessary to have a buffer solution to prevent pH alteration, but I am a little confused about it. Do I really need to prepare a buffer solution or just a pH adjuster (e.g. citric acid, alctic acid, sodium hydroxide) can already fix the problem? How can I prepare a buffer solution? Do I need to calculate something? I'm having trouble understanding it.

Also, anyone has any more tips about working with urea?

Thanks in advance!

Kind regards, 

Comments

  • GraillotionGraillotion Member
    edited November 25
    Try searching triethyl citrate in relation to urea....that might get you on a path. :)  (And use the lactic acid.)

    Since you did not list the formula...difficult to give any better kind of answer.  Do you have some liquid diol/polyol as part of the formula?

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