Home Cosmetic Science Talk Formulating Do esters require an antioxidant?

  • Do esters require an antioxidant?

    Posted by camel on April 19, 2022 at 6:03 am

    Specifically, I am thinking to incorporate NatraSil (Hydrogenated Ethylhexyl Olivate, Hydrogenated Olive Oil Unsaponifiables) into my moisturizer at around 2-3%. 

    Will I need to add an antioxidant like tocopherol if I do this? There are no other components in the formula that require one.

    Thank you!

    camel replied 1 year, 10 months ago 4 Members · 5 Replies
  • 5 Replies
  • ngarayeva001

    Member
    April 19, 2022 at 8:19 pm

    I guess that if they are hydrogenated there should not be double bonds but it would be great to hear opinion of professionals.

  • camel

    Member
    April 20, 2022 at 2:01 am

    I guess that if they are hydrogenated there should not be double bonds but it would be great to hear opinion of professionals.

    Thank you; hopefully others will offer some insight!

  • ketchito

    Member
    April 21, 2022 at 2:11 pm

    I side with @ngarayeva001. By the way @ngarayeva001, I read another post you just made and trust me, even you might not consider yourself a professional, you have more knowledge and experience than many “pros” around, so cheers  :)  

  • markbroussard

    Member
    April 21, 2022 at 3:14 pm

    @Camel:

    You are mixing up a couple of different things, Esters and Hydrogenated Oils are not one and the same:  (1) Esters generally do not require an antioxidant unless there is a component of the chemical structure that contains unsaturated C-C double bonds.  The Ester component is an alkylated hydroxyl group that has nothing to do with unsaturated C-C double bonds, the structure is generically C-O-R where R is any alkyl group.  (2) Hydrogenated Oils are oils in which the C-C double bond has been “hydrogenated” … the C-C double bonds have been converted to a C-C single bond by the addition of Hydrogen atoms to each carbon of the C-C double bond.  The C-C double bond is what makes oils more susceptible to oxidation with benefits from the addition of an antioxidant. 

  • camel

    Member
    April 21, 2022 at 7:54 pm

    @MarkBroussard - Thank you for clarifying and providing that thorough explanation! 

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