Preservative for pH below 4 - Chemists Corner

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Preservative for pH below 4

Posted by Thota on April 8, 2019 at 6:39 pm

Hi,
I am making a 10% Lactic Acid gel with 1% PE 9010 as my preservative.
but I am trying to find a replacement for Phenoxyethanol.

what can I do to either reduce phenoxyethanol % or to eliminate it.

is sodium benzoate @ 0.5% enough?

amitvedakar replied 5 years, 8 months ago 7 Members · 8 Replies
8 Replies

Bill_Toge

Member
April 8, 2019 at 8:07 pm

depending on what else you have in the gel, it’s very likely to precipitate out of the gel as benzoic acid below pH 4
twokchu

Member
April 9, 2019 at 2:30 am

This is some information from new direction
MarkBroussard

Member
April 9, 2019 at 2:40 am

Try Phenethyl Alcohol
ngarayeva001

Member
April 9, 2019 at 6:48 am

I often see sodium benzoate and potassium sorbate in peels and acid toners with pH below 4.
Przemyslaw

Member
April 9, 2019 at 7:06 am

Lower pH to 3 or below and You wil have product with low microbiology risk (ISO 29621:2017) and no need to use preservative.
ngarayeva001

Member
April 9, 2019 at 5:27 pm

Skin of most of the people doesn’t tolerate pH below 3 well
twokchu

Member
April 10, 2019 at 2:30 am

H

Link to the full picture
amitvedakar

Member
April 11, 2019 at 4:38 am

often used in pharmaceutical/Pharmaceutical syrup as preservative.

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