Separation of non-polar lipids by high performance liquid chromatography on a cyanopropyl column

✍ Scribed by El-Hamdy, Ali H. ;Christie, William W.

• Publisher: John Wiley and Sons
• Year: 1993
• Tongue: English
• Weight: 292 KB
• Volume: 16
• Category: Article
• ISSN: 0935-6304
• DOI: 10.1002/jhrc.1240160112

✦ Synopsis

The least stable thiophenes were 5-(but-3-ene-l-ynyl)-2,2'bithiophene and 5-(but-3-ene-l-ynyl)-5'-methyl-2,2'-bithiophene. This lower stability is attributed to the molecules' highly conjugated side chains, which interact more strongly with the W A radiation; these side chains are absent in 2,2',5',2"-terthiophene and 5-methyl-2,2',5',2"-terthiophene. It is not clear whether other factors contribute to the increased stability.

More than 35 % of 2,2',5',2"-terthiophene and 5-methyl-2,2',5', 2"-terthiophene was left in the flower oil after 24 h of exposure and it is thus surprising to find reports in the literature which claim that irradiated marigold extracts are not biocidal to mosquitoes IS]. A possible explanation is that the concentrations of 2.2',5',2"terthiophene and 5-methyl-2,2'5',2"-terthiophene are below those required to elicit a biocidal response in mosquitoes. Current work focuses on the economical isolation of this group of insecticidal components.