Cosmetic Science Talk

Cosmetic Science discussion forum. For people who want for formulate cosmetics and get advice from other formulators around the world.
*** Click on one of the three Forum categories below to start a new discussion ***

Home Cosmetic Science Talk General Off Topic Chart for exponential increase in efficiency of organic acids with lower pH.

  • Chart for exponential increase in efficiency of organic acids with lower pH.

    Posted by Graillotion on August 18, 2022 at 7:17 pm

    The other day…I was somewhere on ULP, and saw a chart that showed the exponential increase in efficacy of organic acids as preservatives as pH was lowered.  Now I am kicking myself for not taking a screen shot.

    I work with a lot of beginners…and I need to have that slide in my arsenal.  So many times the mfg’s are including a range that is going way up to almost neutral, all the while knowing the product will just barely function in that range. :(

    If someone remembers or has that slide…I would love the link.

    It was very easy to read, understand…and make your jaw hit the floor.

    Aloha.

    Abdullah replied 9 months, 1 week ago 4 Members · 7 Replies
  • 7 Replies
  • Pharma

    Member
    August 18, 2022 at 7:21 pm

    I have set my Windows calculator to ‘scientific’… comes with the ‘log’ function (though estimating based on pka vs. pH works good enough for me). *Cough-cough*

  • Graillotion

    Member
    August 18, 2022 at 7:22 pm

    Pharma said:

    I have set my Windows calculator to ‘scientific’… comes with the ‘log’ function (though estimating based on pka vs. pH works good enough for me). *Cough-cough*

    I need something….for someone with a little less knowledge. :) 

  • Graillotion

    Member
    August 18, 2022 at 7:33 pm

    Total side bar:

    Came across this…. Efficacy of Several Organic Acids Against Molds - ScienceDirect

    Not what I was looking for…but begged me to ask….it looks like preservatives are not using the most efficient organic acid.  Is this because the good ones….aren’t skin tolerant….or GRAS?

  • Pharma

    Member
    August 18, 2022 at 8:28 pm

    Yup, that’s it.

  • evchem2

    Member
    August 19, 2022 at 12:26 pm

    i couldn’t find anything comparing different acids but some suppliers have charts like you’re describing for their individual preservatives

  • Graillotion

    Member
    August 21, 2022 at 12:24 am

    Thank you @EVchem .

    I also came across this one:

  • Abdullah

    Entrepreneur
    August 21, 2022 at 10:53 am

    and this is for caprylhydroxamic acid