In article <4aagsu$mhf at news-f.iadfw.net>, obscure at airmail.net (Allen
Falkner) writes:
>I am looking for any information pertaining to 0.13% Benzalkonium
>Chloride antiseptic solution <<Bactene>>. I have heard that it habors
>gram negative bacteria and that it has maximum of 28 days of open
>bottle life. After which point it is considered contaminated. Is
>this true? The information I was given came, I believe, from a
>periodical from Stanford Medical Library.
>>
Benzalkonium Chloride is not a preservative or disinfectant I would use
for Gram Negative bacteria. When I formulate a product and need a broader
spectrum, I add 1-2% phenoxyethanol to kill the Gram Negatives. The
D-value for _Pseudomonas_ with only benzalkonium chloride is not fast
enough to remain self-sterilizing see my new book from Marcel Dekker
edited by Don Orth and Jon Kabara: _Principles of Self Preserving Cosmetic
and Drug Formulations_ to be published early in 1996.
Dynamically Optimistic!
Davin C. Enigl
Send Internet e-mail to: enigl at aol.com
Send AOL e-mail to: Enigl
December 15, 1995
10:47 pm
