Home Cosmetic Science Talk Formulating Nonionic Surfactants inactivate Phenoxyethanol and Benzyl Alcohol

  • Nonionic Surfactants inactivate Phenoxyethanol and Benzyl Alcohol

    Posted by labtechnician on July 9, 2014 at 8:05 pm

    Hi all,

    I have used decyl glucoside and Cocamidopropyl Betaine as nonionic surfactants in my surfactant mixture for new shampoo formulation. To preserve my shampoo formula, I am using blends of Phenoxyethanol and Benzyl alcohol with some organic acids. But I have read that nonionic surfactants (Polysorbates) and ethoxylated surfactants may lead to loss of effectiveness of benzyl alcohol and Phenoxyethanol.
    As Decyl glucoside and Cocamidopropyl Betaine are also nonionic surfactants, do they also inactivate Benzyl alcohol and Phenoxyethanol. Are they ethoxylated surfactants? Could anyone help me in this? Your advice will be really appreciated….!!!!!!!
    I know the best way to find a solution of this problem is Preservative Efficacy Testing. And no doubt I will be sending my formula for this test. But if anyone knows about this, I could try with some different preservatives.
    Thanks once again.. Looking forward to listen from you brilliant people..!!!!
    labtechnician replied 10 years ago 2 Members · 2 Replies
  • 2 Replies
  • Bill_Toge

    July 10, 2014 at 3:58 am

    glucosides and CAPB are not ethoxylated, and in my experience they have never had a negative effect on preservatives

    also, CAPB is amphoteric (carries both a negative and a positive charge), rather than non-ionic

    the only real problem I can foresee from using phenoxyethanol in a product like this would be mixing it in and getting it to stay in; it has very low solubility in water

  • labtechnician

    July 14, 2014 at 7:06 pm

    Hi @Bill_Toge

    Thanks for your comment. Really helpful. Thank you once again

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