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lactic acid

 
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susan
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PostPosted: Mon Jun 20, 2005 9:48 pm    Post subject: lactic acid Reply with quote

Hello,

I am interested in purchasing bulk quantities of lactic acid from a chemical supplier and then diluting the mixture myself in order to use in a cosmetic cream. I have located a chemical dealer, however, there are several options for lactic acids and I am not sure which is suitable for cosmetic purposes. Can the doctor or anyone else offer some advice? The options I have are:

DL-Lactic Acid
L-(+)-Lactic Acid, High Purity
Lactic Acid, 0.1 N Solution
Lactic Acid, 1.0 N Solution
Lactic Acid, 85%, FCC
Lactic Acid, 85%, Reagent, ACS
Lactic Acid, Racemic, USP

Thank you.

Susan
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drtodorov
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Joined: 10 Dec 2004
Posts: 3177

PostPosted: Tue Jun 21, 2005 12:09 am    Post subject: Reply with quote

First: even though lactic acid is a relatively weak acid, used improperly, at excessive concentrations, it can still damage your skin. I do NOT recommend DIY-ing lactic acid or other AHA unless you have professional expertise.

In any case, the info you provide is not enough for a definitive answer. Ideally, one would want L-lactic acid, food grade. FCC means food grade, but it is unclear if "Lactic Acid, 85%, FCC" is L form or racemic mixture. Still, it is probably safest to use food grade even if you are unsure if it is L form or a racemic mix. If you decide to be careless enough to experiment with lactic acid or other AHA (NOT RECOMMENDED), make sure you sufficiently dilute the concentratied stock solution and check the resulting pH to be in the safe range for the type of formula you are making.
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susan
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PostPosted: Tue Jun 21, 2005 11:59 am    Post subject: Reply with quote

Thank you doctor for your advice and concern. I have experience in formulating my own skin peels as I have been doing it for 4 years. Typically I purchase them from cosmetic companies, however, the prices they charge for a small bottle is rediculous. I plan to dilute the acid down to less than 3%.

Anyway, I have some more detail about the "Lactic Acid, 85%, FCC":

Lactic Acid, 85%, FCC
2-Hydroxypropionic Acid
Lactic Acid is a mixture of Lactic Acid and Lactic Acid Lactate.
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drtodorov
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Joined: 10 Dec 2004
Posts: 3177

PostPosted: Tue Jun 21, 2005 1:50 pm    Post subject: Reply with quote

susan wrote:

Lactic Acid is a mixture of Lactic Acid and Lactic Acid Lactate.


Is it 85% lactic acid and 15% lactate or 85% of lactic acid+lactate?
Percent of lactate will affect pH.
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