40 likes | 168 Views
BI-793 Spring 2012 Lecture 9 Assignment. Name___________________________. 1. MS of glycoconjugates. Go to www.lipidmaps.org . Select five lipids or glycolipids from the data standards, from different classes. Go to the experimental results section for each.
E N D
BI-793 Spring 2012 Lecture 9 Assignment Name___________________________
1. MS of glycoconjugates • Go to www.lipidmaps.org. • Select five lipids or glycolipids from the data standards, from different classes. • Go to the experimental results section for each. • Print the structure and MS/MS spectrum. • Assign the major fragments. • Note: You should avoid selecting the same examples as a classmate.
2. Please read R. Chan et al., J. Virology, 2008, 82, 11228–11238. Retroviruses Human Immunodeficiency Virus and Murine Leukemia Virus Are Enriched in Phosphoinositides. • What lipids are associated with the virus particles? • Which lipids would be detected with the highest sensitivity in the positive ion mode? Which in the negative ion mode? • Select an example of each of the classes which appear in the MS spectra presented in Fig. 2, draw the structures and assign the major predicted fragment ions. • What are three challenges presented by this type of analysis and how did the authors address each difficulty?
3. Please read H. Park, et al.,J. Lipid Res. 2010, 51, 480-489. Transcript profiling and lipidomic analysis of ceramide subspecies in mouse embryonic stem cells andembryoid bodies. • What procedure was used for lipid isolation? • Why LC conditions and mass spectrometer were used? Why were these chosen? • What could be the advantages or disadvantages of using MALDI-MS instead of ESI-MS for the analyses described here? • What standards were used for quantification? What were the ranges over which quantitative data was obtained and how accurate were the results? Do you have suggestions for improvement?