Oils causing Dos

[trishwosere]

I have looked and used the search engine...honest I have but I'm stumped as to where I read it. I read on here a list (or and address addy to a list) about the most problematic oils causing DOS, I know I should of bookmarked the page, but I didn't Can someone please point me in the right direction?
Many thanks for any replies ~ much appreciated

 

[judymoody]

I don't have the link but here are some that should be used only in small quantities (10% or less) if at all.

canola
soy
corn
sunflower and safflower (unless it's the high oleic kind)
hemp
grapeseed

That's all I can remember off the top of my head.

 

[Fragola]

I am not sure this is correct, but I personally use the shelf life to guide me on this matter (which info is easily available).

should be used only in small quantities (10% or less)

10% of these oils doesn't still result in 10% DOS ?

 

[judymoody]

From what I understand, oils that are high in linoleic acids are more prone to oxidation/DOS. If you use those oils, you should use them sparingly so that the total fatty acid profile of your soap recipe is not overly heavy in the linoleic category. Soapcalc does a very nice job of calculating the fatty acid profile of each individual oil and for your recipe as a whole. That's the principle I've been using in my formulations. Maybe somebody else can chime in here if I'm off base.

 

[IrishLass]

From what I understand, oils that are high in linoleic acids are more prone to oxidation/DOS. If you use those oils, you should use them sparingly so that the total fatty acid profile of your soap recipe is not overly heavy in the linoleic category. Soapcalc does a very nice job of calculating the fatty acid profile of each individual oil and for your recipe as a whole. That's the principle I've been using in my formulations. Maybe somebody else can chime in here if I'm off base.

Ditto what judymody said.

IrishLass

 

[trishwosere]

Thank you all for your replies

From what I understand, oils that are high in linoleic acids are more prone to oxidation/DOS. If you use those oils, you should use them sparingly so that the total fatty acid profile of your soap recipe is not overly heavy in the linoleic category. Soapcalc does a very nice job of calculating the fatty acid profile of each individual oil and for your recipe as a whole. That's the principle I've been using in my formulations. Maybe somebody else can chime in here if I'm off base.

Thanks Judy...What would you class as high? Is there a guided recommendation? Basically what sort of number should I aim for please?

 

[soapbuddy]

I got DOS with canola, so I no longer use it.

 

[trishwosere]

I got DOS with canola, so I no longer use it.

Is canola what we call in the U.K rapeseed oil?

 

[soapbuddy]

I got DOS with canola, so I no longer use it.

Is canola what we call in the U.K rapeseed oil?

I believe so.

 

[judymoody]

Thank you all for your replies

From what I understand, oils that are high in linoleic acids are more prone to oxidation/DOS. If you use those oils, you should use them sparingly so that the total fatty acid profile of your soap recipe is not overly heavy in the linoleic category. Soapcalc does a very nice job of calculating the fatty acid profile of each individual oil and for your recipe as a whole. That's the principle I've been using in my formulations. Maybe somebody else can chime in here if I'm off base.

Thanks Judy...What would you class as high? Is there a guided recommendation? Basically what sort of number should I aim for please?

I try to keep it at 15 or less. I don't know if that's a magic number; I just read it in a couple of threads. I have narrowed down my oils list to OO, PO, PKO, CO, Castor and Cocoa Butter. They're all pretty stable.

 

[simplymcghie]

so canola oil really causes DOS? I've been using it over a year now and haven't noticed any problems. But that could also be because the soap gets used before that happens. But I also sell it too. . . hummm. Now I'm stumped because my favorite go to recipes both have canola oil.

 

[trishwosere]

I try to keep it at 15 or less. I don't know if that's a magic number; I just read it in a couple of threads. I have narrowed down my oils list to OO, PO, PKO, CO, Castor and Cocoa Butter. They're all pretty stable.

Many thanks Judy, much appreciated

 

[Guywithsoap?]

Another thread lead me to search a figure named Dunn and his studies on DOS.

I found this page which chronicles OO soap and DOS.

I have made (with one exception) only OO soaps. I only had DOS happen once.

Others have suggested OO is prone to DOS?

http://www.handmadenews.org/article/index.php?id=7688

 

[DottieF.]

It's not just the kinds of oil you use. It is also the quality and freshness of the oils. You're less likely to have a problem with DOS if you're buying your oils from someplace like Columbus Foods (Soapers Choice) that has a rapid turnover of oils and stores them properly. If you're buying your oils from a rinkydink grocery store or BigLots (where your oils may have been sitting on the shelf for who knows how long or sitting in a hot warehouse) then you may be a lot more likely to have a problem with DOS. Storing your soaps properly (cool & dry) makes a big difference too. I've only had DOS once (13 years soaping) and that was a long time ago during a really hot and muggy summer before I bought a dehumidifier. I've used as much as 15% canola with no problems other than the one time (not sure that batch even had canola in it).

 

[Fragola]

In my area, it's better to buy oils in the winter and also check the expiration date.

 

[Mouse]

I had a Sapmoss soap I made with a high percentage of Soy go DOS, that's the only time it's happened to me. Couldn't tell you the % exactly but probably 50% or so, back when I started out and couldn't afford anything but soy, crisco, and a smaller amount of OO and CO to experiment with.

 

[dieSpinne]

Both Linoleic and Linolenic acids are very fragile and tend to oxidize easily.

For the Linoleic acid, you definitely want to keep the profile below 15%; Linolenic being even more fragile, is best kept below 7% and both together should not exceed 15% if possible. If they do, your soap would benefit from tocopherol (vitamin E) or some other powerful antioxidant. I have also heard that tiny amounts of BHA and BHT can help stave off DOS, but have not found a source for them in usable form yet.

Here are some oils High in the Lins --- I chose those that are either really really common, or examples of those that are really really high in one or the other. You can always go to Soapcalc.net to check the fatty acid content of your intended oils.

BLack Cumin Seed - 60% linoleic
Borage - 43% linoleic
Camelina Seed - 45% Linolenic
Canola Oil - 21% Linoleic
Cherry Kernel Oil - 45% Linoleic, 11% Linolenic
Cherry Kernel, 2nd Pressing, 40% Linoleic
Coffee Bean Oil(green or roasted) - ~39%
Corn Oil - 51% Linoleic
Cottonseed - 52% Linoleic
Cranberry Seed - 37% Linoleic, 32% Linolenic
Evening Primrose - 80% Linoleic
Flax Seed(Linseed) - 50% Linolenic
Grapeseed - 68% Linoleic
Hemp Oil - 57% Linoleic, 10% Linolenic
Kukui Nut - 42% Linoleic, 29% Linolenic
Loofa Seed Oil - 47% Linoleic
Oat Oil - 39% Linoleic
Passionfruit Seed Oil - 70% Linoleic
Peanut Oil - 26% Linoleic
Perilla Seed - 56% Linolenic
Pomegranate Seed Oil - 78% Linolenic
Poppyseed oil - 69% Linoleic
Pumpkin Seed Oil - 50% Linoleic
RBO - 26% Linoleic
Rosehip oil - 46% Linoleic, 31% Linolenic
Sacha Inchi - 35% Linoleic, 48% Linolenic
Safflower Oil - 75% Linoleic
Sesame Oil - 43% Linoleic
Soybean OIl - 50% Linoleic
Sunflower Oil - 70% Linoleic
Walnut oil - 60% Linoleic
Wheat Germ Oil - 58% Linoleic

 

[trishwosere]

Both Linoleic and Linolenic acids are very fragile and tend to oxidize easily.

For the Linoleic acid, you definitely want to keep the profile below 15%; Linolenic being even more fragile, is best kept below 7% and both together should not exceed 15% if possible. If they do, your soap would benefit from tocopherol (vitamin E) or some other powerful antioxidant. I have also heard that tiny amounts of BHA and BHT can help stave off DOS, but have not found a source for them in usable form yet.

Here are some oils High in the Lins --- I chose those that are either really really common, or examples of those that are really really high in one or the other. You can always go to Soapcalc.net to check the fatty acid content of your intended oils.

BLack Cumin Seed - 60% linoleic
Borage - 43% linoleic
Camelina Seed - 45% Linolenic
Canola Oil - 21% Linoleic
Cherry Kernel Oil - 45% Linoleic, 11% Linolenic
Cherry Kernel, 2nd Pressing, 40% Linoleic
Coffee Bean Oil(green or roasted) - ~39%
Corn Oil - 51% Linoleic
Cottonseed - 52% Linoleic
Cranberry Seed - 37% Linoleic, 32% Linolenic
Evening Primrose - 80% Linoleic
Flax Seed(Linseed) - 50% Linolenic
Grapeseed - 68% Linoleic
Hemp Oil - 57% Linoleic, 10% Linolenic
Kukui Nut - 42% Linoleic, 29% Linolenic
Loofa Seed Oil - 47% Linoleic
Oat Oil - 39% Linoleic
Passionfruit Seed Oil - 70% Linoleic
Peanut Oil - 26% Linoleic
Perilla Seed - 56% Linolenic
Pomegranate Seed Oil - 78% Linolenic
Poppyseed oil - 69% Linoleic
Pumpkin Seed Oil - 50% Linoleic
RBO - 26% Linoleic
Rosehip oil - 46% Linoleic, 31% Linolenic
Sacha Inchi - 35% Linoleic, 48% Linolenic
Safflower Oil - 75% Linoleic
Sesame Oil - 43% Linoleic
Soybean OIl - 50% Linoleic
Sunflower Oil - 70% Linoleic
Walnut oil - 60% Linoleic
Wheat Germ Oil - 58% Linoleic

Thank you so much for this info DieSpinne it's very much appreciated

 

[LauraHoosier]

I use 20% canola in my soaps and even my oldest, which compared to many soap here isn't old at all, at 5 months is fine. I still keep an eye on my soaps because of the % I use. I do also add Vit E to every batch after reading about it helping since if I was going to use a preservative I wanted to try to stay with natural ones.

I looked at my Linoleic and Linolenic numbers since this awesome discussion came up because I want to make sure I'm not just inviting DOS on in. They're 11 and 2 respectively but I 'm not positive on soapcalc if that's percentage or just numbers but I think that its percentage and based on the numbers we're talking about I should be fine, correct?

 

[dieSpinne]

LauraHoosier,

I got all my figures from SoapCalc... yes, those numbers are percentages.
With the numbers you describe, you should be fine, but having the little bit of Vitamin E is probably a good idea.