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  • @gordof do you know something that’s good to use for a deodorant?

    Would it prevent sweating and clog pores/sweat glands (in good or bad ways)?

  • Thank you, I think this may be the category I was looking for-film formers.

  • Cationic emulsifiers because the skin is negative? That’s very interesting-I’ll look into it. I want to clarify but I am not sure which part was unclear to you so I’ll just try describing in different words. I’m looking for things that help ingredients stay longer and not get easily lost from rubbing, sweating, etc. I guess this can be done via film formation as was pointed out by @gordof , or something that helps ingredients “stick” better to the skin significantly.

  • Bluebird

    Scientist
    June 13, 2023 at 10:37 pm in reply to: Low pH Stick Deodorant

    I see. What do you think of the stability of such an ester in water? I cannot say for sure.

  • Bluebird

    Scientist
    June 13, 2023 at 10:18 pm in reply to: Low pH Stick Deodorant

    @Graillotion

    I have a new thought about the part you wrote on C12-13 Alkyl Lactate and want to hear your thought as a chemist.

    When applied neat, perhaps this ester reacts with water only on the pits->becomes carboxylic acid and ethanol via hydrolysis, and kills bacteria OR becomes ethanol and lactic acid via some bacterial enzyme and kills via lactic acid.

    But when included to only a few % of your product, perhaps just not enough in amount for that reaction,

    OR it already hydrolyzed within your product and when applied to the pits, unlike when applied neat, does not have a high local concentration of carboxylic acid and ethanol.

  • Bluebird

    Scientist
    June 7, 2023 at 7:07 am in reply to: Low pH Stick Deodorant

    What are you using this LipidSoft™ Lactic for?

    You said an emollient-was moisturizing the primary purpose? If so, why not things like glycerin?

    Elsewhere I also read that this has a similar effect as lactic acid but is oil-soluble.

    Were you trying to lower pH using this in emulsified deo?

    Surprising that this was so effective as deo when applied neat.

  • Bluebird

    Scientist
    June 12, 2023 at 11:49 pm in reply to: Challenge test- “no increase” of mold

    pH of 4-5 (TBD), and the other anti-bacterial parts, also TBD.

  • Bluebird

    Scientist
    June 12, 2023 at 4:55 am in reply to: Challenge test- “no increase” of mold

    I plan to use potassium sorbate.

    I was thinking ahead while waiting for Aspergillus to arrive for me to test. 🙂

  • Bluebird

    Scientist
    June 10, 2023 at 9:52 pm in reply to: Preservative that ONLY kills Gram-negative bacteria

    Having Gram + only vs Gram - only preservatives help if I want to do a challenge test with both kinds into the product, but plate out separately and do selection.

  • Bluebird

    Scientist
    June 10, 2023 at 9:51 pm in reply to: Preservative that ONLY kills Gram-negative bacteria

    Thanks, good to know phenylethyl alcohol.

    And oh, I meant by “change the microbiome”: I do believe that many if not most deodorants do affect the microbiome, synthetic and “natural” deodorants alike.

  • Bluebird

    Scientist
    June 10, 2023 at 7:36 am in reply to: Ways to dissolve menthyl lactate/menthol

    I tried dissolving in EtOh to make the ~40% stock solution and added to create the final concentration of 0.1%.

    It led to immediate particle formation when put into the final liquid.

  • Bluebird

    Scientist
    June 8, 2023 at 8:55 am in reply to: Ramping down Spectrastat by Inolex to 0.4%

    Why do you say so?

  • Bluebird

    Scientist
    June 8, 2023 at 8:54 am in reply to: Ramping down Spectrastat by Inolex to 0.4%

    Are you being sarcastic?

    It’s a preservative

  • Bluebird

    Scientist
    June 8, 2023 at 2:57 am in reply to: Ramping down Spectrastat by Inolex to 0.4%

    An update: got actual data from Inolex, stability of CHA at pH4: stable, with no detection of hydroxamine via mass spec.

  • Bluebird

    Scientist
    June 7, 2023 at 9:32 pm in reply to: EPC-K1 for deodorant

    Okay.

    EPC-K1 manages odor even when there are bacteria.

    Other ingredients try to kill bacteria.

    But bacteria make a comeback-for some people, easily.

    It is a matter of always try to kill vs having an additional weapon as an additional layer.

    Blatant killing without additional measure often does not work well in fighting microbes.

    However, I’d like to hear what are such awesome deo recipes you mention.

    Do you know ingredients that would lead to at least 48h odor protection?

    Please share, I have a lot to learn.

  • Bluebird

    Scientist
    June 7, 2023 at 7:01 pm in reply to: EPC-K1 for deodorant

    But why ethylhexylglycerin there?

  • Bluebird

    Scientist
    June 7, 2023 at 7:00 pm in reply to: EPC-K1 for deodorant

    They would have different effects that do matter.

    But EPC-K1 is also used for cosmetics already, so not just pharma.

    I believe it’s just expensive now because it’s uncommon.

  • Bluebird

    Scientist
    June 7, 2023 at 7:02 am in reply to: Number of hours your deo lasts (to write on the label)

    Thank you for sharing.

  • Bluebird

    Scientist
    June 7, 2023 at 7:01 am in reply to: Number of hours your deo lasts (to write on the label)

    That is good to know. Thank you

  • Bluebird

    Scientist
    June 7, 2023 at 6:42 am in reply to: Number of hours your deo lasts (to write on the label)

    Brilliant.

  • Bluebird

    Scientist
    June 7, 2023 at 5:16 am in reply to: Low pH Stick Deodorant

    I see there really are quite a few cool people on this forum and I’m delighted to find them.

    Great to know about mandelic vs lactate, hours of lasting, etc.

    The funk part gets me to think about Amazon one star reviews on Lume, which complains that Lume is effective against B.O., but on its own, it sticks and smells like B.O. when being applied. I suspect that is from mandelic acid, or possibly reaction with other things.

  • Bluebird

    Scientist
    June 7, 2023 at 5:13 am in reply to: Low pH Stick Deodorant

    Ah, that’s good to know, so that’s the acid that comes in a powdery form! I have been hoping something like that would exist, you know, the opposite of baking soda in terms of the pH but similarly in a powder form. I don’t get this part though (“they have a claim”)- can you explain?

  • Bluebird

    Scientist
    June 7, 2023 at 1:09 am in reply to: Low pH Stick Deodorant

    What do you mean? Did you mean mandelic acid in lume is sold as powders and that’s why they use it?

  • Bluebird

    Scientist
    June 7, 2023 at 1:07 am in reply to: Preservative that ONLY kills Gram-negative bacteria

    After I read Abdullah’s comment I searched, and found that the minimum inhibitory concentration for Staph is more than twice higher than that of E. coli and Pseudomonas. So his comment may be true (I hope so).

    https://www.sci-hub.se/10.1111/j.1468-2494.2010.00619.x

    But I will have to test whether it’s of sufficient power using the bacteria myself.

  • Bluebird

    Scientist
    June 7, 2023 at 1:05 am in reply to: Low pH Stick Deodorant

    Are things like this custom-made containers?

    I’m not gonna lie, though, this looks amazingly effective BUT a bit scary as I have a slight trypophobia (afraid of such patterns).

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