Ultrasonic versus silent methylation of vegetable oils.
The profile of fatty acid methyl esters (FAME) of different vegetable oils produced under ultrasonic irradiation and conventional heating were compared. In the presence of potassium hydroxide as catalyst, the distribution of FAME was quite similar for both procedures, while in the case of sodium hydroxide ultrasonic irradiation gave better results. The FAME profile resulted from the reaction catalyzed by sulfuric acid was almost the same with the one resulted from the reaction catalyzed by KOH, while boron trifluoride can give rise to many artifacts, thus is not a reliable catalyst.
Stavarache
Carmen
C
Costin D. Nenitzescu Institute of Organic Chemistry, 060023 Bucharest, PO Box 15-254, Romania. stavarachec@yahoo.com
Vinatoru
M
M
Maeda
Y
Y
D004952:Esters / Q000737:chemistry; D005227:Fatty Acids / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry; D006878:Hydroxides / Q000737:chemistry; D000432:Methanol / Q000737:chemistry; D008745:Methylation; D008956:Models, Chemical; D010938:Plant Oils / Q000737:chemistry*; D017680:Potassium Compounds / Q000737:chemistry; D012972:Sodium Hydroxide / Q000737:chemistry; D013696:Temperature; D014280:Triglycerides / Q000737:chemistry; D014465:Ultrasonics
D004952:Esters; D005227:Fatty Acids; D006878:Hydroxides; D010938:Plant Oils; D017680:Potassium Compounds; D014280:Triglycerides; D012972:Sodium Hydroxide; C029943:potassium hydroxide; D000432:Methanol