The Vespiary

The Hive => Newbee Forum => Topic started by: skanic on July 15, 2004, 01:14:00 PM

Title: ester synthesis
Post by: skanic on July 15, 2004, 01:14:00 PM

will i have a triglyceride if i mix 3 parts oil (or butter) in 1 part of glycerol ?

Title: and if i had a little h2so4 ?
Post by: skanic on July 15, 2004, 02:15:00 PM

and if i had a little h2so4 ?

Title: Fischer esterification
Post by: Rhodium on July 15, 2004, 02:20:00 PM

Heating aliphatic carboxylic acids with glycerol (and optionally a catalytic amount of a strong mineral acid) will esterify the components to form various triglyceride esters. The procedure is called Fischer esterification. It will not happen at room temperature (>100°C is suitable) or in aqueous solution.

Neither "oil" or "butter" could be classified as "aliphatic carboxylic acids" though. Stearic acid could, however, and is the main constituent of top-grade old-style candles.

Here is a PPT presentation dealing with the esterification of Glycerol with Stearic Acid, forming Tristearin (a triglyceride ester):

http://www.chem.uic.edu/wardrop/teaching/chem234/files/WARDROP-234-17.ppt (http://www.chem.uic.edu/wardrop/teaching/chem234/files/WARDROP-234-17.ppt)

Title: an other question
Post by: skanic on July 15, 2004, 02:36:00 PM

thank you.
You will take me for a fool but i don't understand something,
Do fatty acids that are in oil (corn oil for example) are separated(one by one) OR are they assembled together in complexes (triglycerides) ?
please repond

Title: Free fatty acids are relatively uncommon
Post by: Rhodium on July 15, 2004, 03:16:00 PM

Both vegetabilic oils and animal fats come as triglyceride molecules:

http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/F/Fats.html (http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/F/Fats.html)

Free fatty acids are relatively uncommon to find in large amounts in nature:

http://en.wikipedia.org/wiki/Fat (http://en.wikipedia.org/wiki/Fat)