I am running BioPack on a Varian INOVA 800MHz on a newly aquired 13C15N1H sample and I have come across an issue that I was wondering if anyone could shed some light on.
When it got to the CBCAcoNH, the experiment it setup to calibrate the phi7cal is set to take ~3hours! with nt=520. I have reasonable signal (my sample is 0.8mM), so why is it doing this? Does it determine a S/N value at somepoint that maybe went awry?
I set up BioPack in the following manner:
create new experiment, load ghn_co and set parameters:
cexp(100) jexp100 ghn_coTROSY='n' gzlvl1=10000 gzlvl2=9600 mag_flg='n' np=1024, tpwr=62, pwClvl=63, pwNlvl=62set pw and tof as manually determined
Main Menu ->Setup->Proteins->Manag Probe Files=> Update Probe Files with these Parameters
Back->Calibrate->Full
Thanks for any insights!
Check if somebody has answered this question on NMRWiki QA forum
Did you find this post helpful? |
Similar Threads
Thread
Thread Starter
Forum
Replies
Last Post
[U. of Ottawa NMR Facility Blog] Radiation Damping and Pulse Calibration
Radiation Damping and Pulse Calibration
Radiation damping causes broadening in the NMR resonances of very strong signals (such as the 1H signal of pure water) as a result of currents induced in the coil from the strong transverse magnetization. Radiation damping can also produce asymmetry and phase irregularities in the affected resonances. These problems make pulse calibration by the standard nutation curve problematic when very strong signals are used for the calibration. The left-hand panel (black) of the figure below shows the standard 1H nutation curves for 0.1% H2O in D2O (bottom)...
nmrlearner
News from NMR blogs
0
06-25-2015 05:28 AM
[Question from NMRWiki Q&A forum] 15N 90 degree hard pulse calibration
15N 90 degree hard pulse calibration
Greetings, I want to ask for some advice in matter of 15N hard pulse calibration on Bruker machines. I'm working on Avance DRX 500 with 5mm TBI probe. This calibration is easy to made if 15N urea is avaible, but I don't have opportunity to use this compound. I have in my stable horses as follows:
methylamine hydrochloride (99% 15N) ammonium chloride (99,9% 15N) aniline (15N >99%) sodium nitrite (99% 15N)
I tried to use first two salts in DMSO-d6. Unfortunately I couldn't obtain proton spectrum with multiplet structure that is needed for pulse...
nmrlearner
News from other NMR forums
0
08-19-2014 11:21 AM
[Question from NMRWiki Q&A forum] Calibration of a Bruker NMR probe
Calibration of a Bruker NMR probe
I've received a loaner probe from Bruker while ours is being repaired but I'm not getting any timely response on instructions on calibrating it for use. Anyone have a resource or documentation?
Thanks,
Ken
nmrlearner
News from other NMR forums
0
06-16-2012 06:01 AM
Microsecond Time-Scale Conformational Exchange in Proteins: Using Long Molecular Dynamics Trajectory To Simulate NMR Relaxation Dispersion Data
Microsecond Time-Scale Conformational Exchange in Proteins: Using Long Molecular Dynamics Trajectory To Simulate NMR Relaxation Dispersion Data
Yi Xue, Joshua M. Ward, Tairan Yuwen, Ivan S. Podkorytov and Nikolai R. Skrynnikov
http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/0/jacsat.ahead-of-print/ja206442c/aop/images/medium/ja-2011-06442c_0001.gif
Journal of the American Chemical Society
DOI: 10.1021/ja206442c
http://feeds.feedburner.com/~ff/acs/jacsat?d=yIl2AUoC8zA
http://feeds.feedburner.com/~r/acs/jacsat/~4/NvRRKHU2H3k
nmrlearner
Journal club
0
01-28-2012 05:27 AM
[Question from NMRWiki Q&A forum] 2D Filtered NOESY/TOCSY on Varian Biopack
2D Filtered NOESY/TOCSY on Varian Biopack
I am attempting to run some filtered NOESY and TOCSY experiments using sequences in the Varian Biopack - CNfiltocsy and CNfilnoesy. The experiments seem to run fine, but when overlaying the processed spectra something seems odd - the TOCSY crosspeaks are not present in the NOESY spectra and vice-versa. Does anyone know why this might be the case?
Check if somebody has answered this question on NMRWiki QA forum
nmrlearner
News from other NMR forums
0
12-20-2010 01:52 AM
[Question from NMRWiki Q&A forum] Varian Biopack pulse sequences for intermolecular NOEs
Varian Biopack pulse sequences for intermolecular NOEs
Hi All, I'm trying to set up some experiments to determine intermolecular NOEs in a peptide:protein complex. At the moment from looking at the Biopack library, I have found 4 pulse sequences which will do this and each provide different information (gnoesyNhsqc_CN, gnoesyNhsqc_NN, gnoesyChsqc_CC and gnoesyChsqc_NC). Would people recommend using a combination of all four of these experiments to determine the intermolecular NOEs for use in structure calculations?
Check if somebody has answered this question on NMRWiki QA forum
[U. of Ottawa NMR Facility Blog] Temperature Calibration - An Alternative Method
Temperature Calibration - An Alternative Method
It is well known that the actual temperature of a sample in an NMR probe is not necessarily the same as that read from the variable temperature unit on the spectrometer. This is because the thermocouple used by the variable temperature unit is below the sample tube and not in the center of the rf coil where the NMR measurements are made. One normally must make a calibration plot for the actual temperature vs. the set temperature. For temperatures above room temperature this can be done by employing the known temperature dependent chemical...