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Buffer system for urea in a product with ph 8
Hello All,
Looking to buffer urea in a body wash with a ph of 8.
Based on pK, citric is used only up to ph 6 and lactic only good to 4.8.I should note that the body wash contains African black soap as a label ingredient and so must have pH of at least 8.
Of course I will be experimenting, but any advice on buffering urea could save me much time and aggravation.
Thank you!
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5 Replies
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If you have soap in formula, you do not need a buffer as the former is a good buffer:you are at PH 8 so you should have some free fatty acid which is even better.
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Dr Bob,
Thank you, you are brilliant! -
you are welcome and kind to say that
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Hi Dr Bob,
Just an update, after 7 days my pH has gone from 8 to 8.2. I am using 4% soap in the formula and end up with a pH of 8.5, adjusted to 8 with lactic acid.
At this point, I may just send it to production without urea, but will continue experimenting. Thought I would share, since you were kind enough to help me. -
Thanks Ph should level out at 8.0-8.2 in stability study-cheers
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