Hello, dear NMR Managers,
In last Saturday, I emailed to AMMRL to know the S/N of CryoProbe. I
obtained quite a few replies. The results are listed in the following
table.
Institution
Instrument
S/N
University of Connecticut
Varian 600
4000:1
3M Pharmaceuticals
Bruker 700 TXI
7400:1
University of Pittsburgh
Bruker 800
6036:1
University of Chicago
Varian 600
5100:1
UT-Houston
Bruker 600
4500:1
University of California, Irvine
Bruker 500 TCI
5453:1
University of Houston
Bruker 800 TCI
6400:1
Additionally, a few friends suggested me pay attention to decoupling
experiment, temperature limits, experiments with proteins, et al. Thank
you all so much.
Today the engineer got another number, the S/N of the peak around 5.4
ppm of Sucrose (2 mM Sucrose with 0.5 mM DSS, 2 mM NaN3 in 10% D2O and
90% H2O), which is 495:1.
I'm very depressed with this number because the S/N of the same sample
with our room temperature probe TXI is 467:1 although the engineer said
he can boost the S/N to 800:1. Even if the S/N is 800:1, the enhancement
is only 1.7-fold. So much money spent is only for the 1.7-fold S/N
enhancement?
Please tell me what the S/N is with Sucrose sample in your cryoprobe.
Thanks in advance,
Youlin Xia
Manager NMR Facility
University of Houston
Houston, TX
Received on Tue Jan 31 2006 - 09:50:13 MST