|Department of Chemistry, University of Alberta||
There are no fixed publishing dates for this newsletter; its appearance solely depends on whether there is a need to present information to the users of the spectrometers or not.
|For those who came here to check the origin of the Christmas tree shown above and on the printed version: it grew in about 2 seconds inside an Inova spectrometer and looked like this before some "decorating" (also known as FID in NMR).|
Other content of this NMR News is no longer meaningful and has been removed April 2010.
|FAQ 98-09.1 GCOSY and GTOCSY: what's the difference?|
FAQ 98-09.1 GCOSY
and GTOCSY: what's the difference?
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< this image contains links
|GTOCSY is as easy to run as GCOSY within the EZ NMR system. However, there is one parameter which needs some adjustment: the length of the spin locking time controlled by the parameter mix. The value of mix depends on the size of the coupling constants and how far correlations are desired in a spin system. At very short mixing times a GTOCSY is essentially no different than a GCOSY. With increasing mix correlations further and further away will be observed. A detailed help file dealing with the the selection of mix and GTOCSY in general has been added to the system and is available here.|
References for GTOCSY experiment
R.E. Hurd, Journal of Magnetic Resonance 87, 422-428 (1990)
Field gradient techniques in NMR
L.E. Kay, Current Opinion in Structural Biology 5, 674-681 (1995)
Gradient-enhanced homonuclear 2D NMR
techniques applied to oligosaccharides containing manno-hexoses provide improved
correlations for protons coupled by small 3J
A. Otter, O. Hindsgaul and D.R. Bundle, Carbohydrate Research 275, 381-389 (1995)
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