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1,4 Dioxane in shampoo
Hi every body. I come back after a long time and I miss all you. :p
sorry does any one know how can I extract 1,4 dioxane from shampoo. I read several papers however didnt find a good method for mine. -
26 Replies
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Once you have a shampoo batch made, there’s nothing you can do.
The only way to do this is to use a surfactant system that has no 1,4 dioxane in it to begin with.
Otherwise, you can use surfactants that are “steam-stripped” to reduce the dioxane to levels below 10ppm, but it never goes away completely.
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my aim is to determine 1,4 dioxane in shampoo. i solve sample in water and detrmine by GC chromatography. but i want to be sure that all 1,4 dioxane is extracted to water.
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Oh, you need a method. Now I understand - but this is way, way out of my field of expertise. You need to talk to an analytical chemist.
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and it seems there is no analytical chemist here, ya?
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and it seems there is no analytical chemist here, ya?
The material is very difficult to detect in any meaningful way.
The methods suggested by the EPA are to be found in Technical Fact Sheet – 1,4-Dioxane - US Environmental Protection …
page 5
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@johnb there are several methods which of them is ok?
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That’s something you will have to try for yourself.
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I feel you are being very unfair by posting that negative response.
We have done a lot of work on your behalf on this question and you ought to be able to put in at least some work yourself rather than just asking others to do it for you.
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THIS IS NOT NEGATIVE RESPONSE
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@johnb sorry do u have any experence in analysing essence? i mean GC chromaography
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I do have experience in the analysis of fragrances and essential oils by numerous techniques.
My practical experience does not, however, extend to the analysis of dioxanes or any related materials mainly because it has not been a requirement anywhere to do this and I doubt that it is of very much concern to others in the cosmetics industry at the present time. If or when the dioxane content of cosmetics products does become regulated then the relevant authorities will produce the analytical methods they require to be able to comply.
The way to avoid dioxanes is to avoid the use of ethoxylated raw materials in your products or, at least, ask the supplier of ethoxylated raw materials for a certificate of compliance for dioxane content of their product.
Remember also that many thousands of tonnes of 1,4 dioxane is still manufactured annually as an industrial solvent with numerous end uses - some even ends up in consumer products.
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OK then how u analyse powdery essence? I mean you solve in which solvent that you be sure all ingredients are solved? and then u analyze it by GC
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You are now asking a different question to the original.
I have never come across “powdery essences”.
The solvent I have used most often for dissolving perfume compounds is di-isopropyl ether in a distillation technique of my own design using a modified Cocking & Middleton apparatus. I doubt this would be suitable for dioxane. The C&M apparatus is illustrated here http://www.glasschem.co.za/products/glassware/water-estimators/item/determination-of-essential-oils-in-herbal-drugs and its use is described in the British and European Pharmacopoeiae (as well as elsewhere, probably).
You really need to take a course in analytical techniques to find this out properly.
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In all seriousness, for the vast majority of cosmetic companies, analytical work like this is contracted out, because the effort involved to do it in-house just isn’t worth it compared to the outside lab analytical costs.
For 1,4 dioxane in particular, no one analyzes for it in a shampoo precisely because it is only present in ethoxylated surfactants AND because the surfactants in question each come in with a CofA documenting the precise amount of 1,4 Dioxane in each lot. Going from the concentrations of 1,4 dioxane in the surfactant ingredients to the concentration of 1,4 dioxane in the finished product is a relatively simple calculation.
The people who do this analytical work on a routine/daily basis are the labs associated with the large SLS/SLES surfactant manufacturers. I would strongly suggest contacting their Technical Service departments for their analytical methods, if you absolutely need to pursue this. I’ve never had a problem getting this sort of information, so I’m pretty sure you won’t have an issue either.
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@Bobzchemist you are completly confusing the subject of discussion.
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I think @Bobzchemist raises good points and I disagree that he is confusing the discussion.
At the risk of prolonging this seemingly endless subject, why are you so concerned about 1,4 dioxane? If you have a client/customer requesting the information, and in the absence of standarised analytical methods, it is their reponsibility to offer a system of analysis acceptable to them.
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john I am in an analytical lab, that one of my job is to determine 1,4dioxane in cosmetic products to report several and several cosmetic brands data sheet to standard lab to get approval of importing those brands. ok?
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but I am involved in formulation too
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I am (was) an analytical chemist before I moved to cosmetics. Your question needs a much deeper anaysis than what is possible to acheieve from a chat like this. Budget, detection limit, presicion, time, matrix differences (shampoos) , why the methods available don’t fit our lab. etc etc.
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I guess this is out of this site
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I still don’t understand why this is so important. I assume this requirement has some official basis in your country. I cannot see a reason to set up complicated analytical procedures to detect a material which is of little or no concern to most of the world.
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If you look at the TDS for Sulfochem ES-70DXS, you will see that one of the specifications is 1,4 Dioxane under 10ppm. Every lot we buy has this specification analyzed for. If you call or write Lubrizol Technical Service, I’m pretty sure they’ll give you their method:
Lubrizol Personal Care Technical Service9911 Brecksville RoadBrecksville OH 44141+1 216-447-5831https://www.lubrizol.com/Personal-Care/Contact/Customer-Service
For anything other than this, you’ll have to hire a consultant.
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I have method but for max 5 ppm for shampoos which is the range in my country is not applicable.and I can not extract this concentration of 1,4 dioxane
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it doesnt have email?
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