Home Cosmetic Science Talk Formulating Lactic Acid Stability

  • Lactic Acid Stability

    Posted by Anonymous on April 25, 2019 at 3:39 pm

    I am having issue with the Lactic acid during stability study. While running the HPLC method %LA tends to increase in the 40C sample (sometimes out of spec). Is this normal? Is there any other method to test for LA in a formula that has multiple acids?   

    Bill_Toge replied 4 years, 12 months ago 1 Member · 1 Reply
  • 1 Reply
  • Bill_Toge

    April 25, 2019 at 6:56 pm

    the most likely explanation is that water is evaporating from the 40 °C sample over time, causing the percentage of lactic acid relative to the whole formula to increase

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