Home Cosmetic Science Talk Formulating Is l-ascorbic acid soluble in 1,3 propanediol?

  • Is l-ascorbic acid soluble in 1,3 propanediol?

    Posted by formulatorN00b on November 27, 2018 at 10:10 pm

    So I recently was Black Friday shopping and I came across a serum product consisting of ascorbic acid and alpha arbutin dissolved in propanediol.  This was from a fairly reputable retailer and so my question is if anybody has any specific solubility information about propanediol.  I found some resources from a manufacturer of this ingredient suggesting that it can dissolve much higher amounts of ascorbic acid than propylene glycol, but again, no specifics.  Any information would be really appreciated.  I’m curious to know if any other cosmetic actives can be dissolved in propanediol as well.  

    ngarayeva001 replied 5 years, 3 months ago 7 Members · 15 Replies
  • 15 Replies
  • ngarayeva001

    Member
    November 27, 2018 at 10:17 pm

    The Ordinary. I made a huge mistake of going there on Friday. The product you are referring to has 8% of both if I am not mistaken. Kielhs has a product with 12% of LAA and 3% of some derivative in propanediol. Propanediol is a good solvent in general. You can use it instead of propylene glycol, but propanediol is considered more “skin friendly” ingredient. You can dissolve ingredients like salicylic acid and allantoin in it.

  • markbroussard

    Member
    November 27, 2018 at 11:02 pm

    @formulatorN00b:

    Yes, Ascorbic Acid is soluble in 1,3-Propanediol at up to 17%.  Much more than that would be pushing the solubility limit and you’ll get some precipitate.

  • ngarayeva001

    Member
    November 27, 2018 at 11:34 pm

    Also it’s a good humectant and reduces tackiness of glycerin. I use it in the most of the lotions I make.

  • bill_toge

    Member
    November 28, 2018 at 12:42 am
    the material commonly called “propanediol” is 1,3-propanediol, while the material commonly called “propylene glycol” is 1,2-propanediol
    in chemical terms they are almost identical, the only substantial difference being their densities and boiling points, but DuPont have patented a sugarcane-based method for manufacturing 1,3-propanediol which wins it some points with the ‘green’ crowd

  • ngarayeva001

    Member
    November 28, 2018 at 7:06 am

    Thank you for clarification  @Bill_Toge. I though that 1,2-Propanediol is the same as propylene glycol but wasn’t sure.

  • doreen

    Member
    November 28, 2018 at 10:12 am

    Some say 1,2 propanediol/PG is (slightly?) more irritating than 1,3 propanediol, because of the lower density/MM.
    I have used both as the main solvent in my liquid 2% salicylic acid exfoliant, but I couldn’t tell a difference. 

  • maria

    Member
    November 28, 2018 at 3:01 pm

    According to Zemea papers the difference in irritating potential seams rather important. Can we believe this?

    It has been hypothesized that dipole moment may influence skin irritation responses, which could provide one explanation for this difference since PDO and PG have different dipole moments—the PDO molecule having greater flexibility.

    I wish I knew what is this flexibility about :D 

  • ngarayeva001

    Member
    November 28, 2018 at 3:38 pm

    Thank you @maria. I read those. I can’t really say whether it’s much better than propylen glycol, but I can say that 1,3 propanediol is a good ingredient in general. I used a couple of product where it’s used a a primary humectant.

  • ngarayeva001

    Member
    November 28, 2018 at 4:02 pm
  • maria

    Member
    November 28, 2018 at 8:33 pm

    Yes @ngarayeva001 I agree with you and there are more and more products with a lot of propanediol, maybe it’s just greenwashing but I like it too.

  • markbroussard

    Member
    November 28, 2018 at 8:36 pm

    It’s so popular that there is a 9-month backlog to purchase bulk volumes.  They can’t make enough of it fast enough to keep up with demand.

  • ngarayeva001

    Member
    November 28, 2018 at 11:49 pm

    @MarkBroussard,  it’s often out of stock on makingcksmetics and lotioncrafter. So I bought 2 litres not to think about it. I understand 2 litres sounds funny for professionals, but it’s a lot for a homecrafter.

  • dr-catherine-pratt

    Member
    November 29, 2018 at 6:29 am

    you don’t need as much solubiliser with propanediol, good solvent, good alternative to people that hate glycerin. The vitamin C to use is Sodium Ascorbyl Phosphate. Hope this helps.

  • doreen

    Member
    November 29, 2018 at 11:22 am

    @maria
    It wouldn’t surprise me. It’s not even the irritating potential for most of the crunchies, the fact alone that PG is being used in anti-freeze makes them anti.

  • ngarayeva001

    Member
    November 29, 2018 at 12:20 pm

    My “secret” mix for creams is 2% Butylene Glycol, 1.5% Glycerin, 1% Propanediol. Sometimes I just skip glycerin at all and up Propanediol.

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