Home Cosmetic Science Talk Formulating pH X shampoo

  • pH X shampoo

    Posted by pma on September 14, 2014 at 3:14 pm

    I’ve just read this study about pH X shampoos:

    http://www.ncbi.nlm.nih.gov/pubmed/25210332

    Does anyone agree with the study? (Of course I’m not considering extreme pH’s, but wondering if a shampoo with pH 5 really would give a better result than a shampoo with pH 7 for instance).

    nasrins replied 9 years, 10 months ago 4 Members · 5 Replies
  • 5 Replies
  • OldPerry

    Member
    September 15, 2014 at 9:28 am

    This doesn’t seem like much of a study.  It doesn’t appear they ran any kind of experiment beyond taking the pH of shampoos.  I’m left wondering…

    1.  How did they determine that “alkaline pH increases friction between fibers”?
    2.  How did they demonstrate that “lower pH of shampoos may cause less frizzing for generating less negative static electricity on the fiber surface”?
    In my estimation this is a junk study that doesn’t prove much of anything.  In my opinion based on years of work with shampoo formulations, you would be hard pressed to demonstrate any significant difference between a shampoo with a pH of 5 versus one with a pH of 7.
  • Bobzchemist

    Member
    September 15, 2014 at 10:29 am
    Perry is right - this “study” is a piece of poo (pun intended). It reads like a child’s science fair project.

    Reputable studies give experimental data, divulge exact procedures, list every bit of equipment, and draw logical conclusions - this study has done absolutely none of that. I also agree that the difference between pH7 and pH5 shampoos may be too small to measure.

    Not all of the information/studies are published, but if I recall correctly, there is an overwhelming preponderance of evidence that the hair shaft is smoother and combing resistance goes down on post-shampooed hair as the pH of the shampoo decreases. Both precise measurements of combing resistance (Instron) and electron microphotographs exist to confirm this.

    I know that there is supplier literature about this somewhere.
  • pma

    Member
    September 15, 2014 at 7:51 pm
  • OldPerry

    Member
    September 15, 2014 at 11:00 pm

    Thanks for the link!

  • nasrins

    Member
    September 16, 2014 at 4:44 am

    @bobzchemist I saw in one of ur comments that u said  the shampoo with pH=4 is more effective and more safe for hair

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