WHY IS MEADOWFOAM SEED OIL SO STABLE AND WHY DOES IT HELP OTHERS BECOME MORE STABLE?
The picture to your left is of the conjugated linoleic acid molecule. You can see there's a difference between the eicosenoic acid bonds and the conjugated linoleic acid bonds. So what does this mean?
From this post on conjugated linoleic acid: A conjugated molecule is an organic compound is one where atoms covalently bond alternating single and double bonds that influence each other to produce a region called the electron delocalization. In this region, electrons do not belong to a single bond or atom but to a group.
Very nice but what the heck does this mean for us? A conjugated linoleic acid is like linoleic acid in that it has 18 carbons with two double bonds, but we see the trans and cis configurations in there making the fatty acid all twisted instead of a nice straight line. The cis configuration means the molecules won't lie down nicely, so this oil is going to be slightly thicker than one filled with nice straight molecules like those we find in a trans molecule. (See the molecule above!)
What this means is that a fatty acid like conjugated linoleic acid will have bonds that break easier than those in meadowfoam seed oil, and broken bonds leads to rancidity, meaning a fatty acid with this kind of composition will go rancid or have a shorter shelf life than one without these kinds of bonds. Since meadowfoam seed oil's bonds are harder to break, it'll have a longer shelf life than other oils.
Want to know more about 1,3-di(3-methoxybenzul) thiourea? Check out this Powerpoint!
Rancidity: A primer
Mechanisms of rancidity
More links on rancidity and contamination
Data sheet from Brenntag Specialties
Quick summary page from Brenntag Specialties
Interesting article comparing jojoba and meadowfoam seed oils
Page 140, The Biological Activity of Photochemicals
Join me Thursday as we start formulating a few things with this fascinating oil!