Buffer for carbomer cream — Cosmetic Science Talk

Buffer for carbomer cream

Does the pH of a cream shift over time?
If so, what buffer would you recommend for carbomer creams in a pH range between 5-6?
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Comments

  • You asked two questions--the first is yes creams depending upon composition can and do exhibit a Ph shift.Carbomer based creams do not usually exhibit a PH shift at 5.5 to 6.0 using TEA. Should the need arise a small amount of 0.1 M citric acid buffer should stabilize the cream.\ but use as little as possible due to electrolyte sensitivity.
  • Good to know bc I’m planning on making a carbomer cream
  • @DRBOB@VERDIENT.BIZ
    Thanks. I actually never use TEA to neutralize, mostly NaOH in different concentrations.

    @tanelise
    The only disadvantage of carbomers is their sensivity to electrolytes, but for the rest they're absolutely superior to gums, like xanthan!
    I now have the Ultrez 10 and ETD 2020 (Lubrizol) and I'm still getting to use these, but I absolutely love the sensorials!
  • I think that 940 has better sensorials than Ultrez 20 but it is much more difficult to hydrate.

    Design of anti-aging creams, gels, and serums; shampoos; and therapeutic cosmetics. In-house label and box design capability.
  • @Belassi
    Ok, thanks! You mean better than the Ultrez 10? (I don't have Ultrez 20)
  • Ultrez 30 will provide better electrolyte tolerance and deliver sensorials similar to Ultrez 10:also very easy to work with.
  • I can't comment on Ultrez 10, sorry.
    Design of anti-aging creams, gels, and serums; shampoos; and therapeutic cosmetics. In-house label and box design capability.
  • @DRBOB@VERDIENT.BIZ
    Thanks! :-) 
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