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Lua Shixiong wrote: > Hi ccpnmr, > > I need to analyze the chemical shifts differences for a series of HSQC with > increasing ligand concentration. > > i have followed the instruction on following chemical shifts in the ccpnmr > tutorials. But an message showed that a fit failed for X number of groups at > reference position X. And indeed, i was not able to get a fitting for all > the reference peaks i had. > > Could someone please guide me on how to execute the analysis? > > Many thanks in advance Hi, please check that you a) grouped the peaks first b) have the fitting function set to something sensible (A+Bx usually does well) c) picked peaks in all spectra d) have set individual shift lists for all spectra This is basically the list of errors that I encountered when Follow Shift Changes did not work for me. Alternatively you may want to change the shift change tolerance if you are experiencing large peak shifts. Cheers. jcw -- Dr Jan-Christoph Westermann | Phone:+61 (0)7 334 62021 Research Officer | Group David Craik Institute for Molecular Bioscience University of Queensland, Brisbane 4072, Australia