Hi Weixing
as pointed out by Sameer the Bruker tubes work just fine. But you have to be
aware of the specifications.
The inner diameter variation leads to about +/- 2.5% volume variation. This
is a factor when using external referencing for quatification (eretic 2).
You can correct for it with SOLCOR by Jason Ewanicki et. al.
https://doi.org/10.1002/mrc.5027
Using tuneaxyz in topshim is helpful to improve resolution when using lower
cost tubes.
Clemens
On 5/19/2026 5:02 PM, Zhang, Weixing via groups.io wrote:
Dear Colleagues,
I would appreciate your input regarding NMR tube selection for high-field a=
pplications.
In the past, I routinely used Wilmad 535-PP-7-5 tubes on a 600 MHz instrument
with good results. However, the current pricing of these tubes has increased
substantially. Both Wilmad and Norell now offer tubes specifically marketed
for 800 MHz applications, such as the Wilmad 541-PP-7-5 and Norell S-5-800-7,
but these products come at a significant premium. In practice, however, I
have not often observed these higher-cost tubes being widely used, even on
800 MHz or 1.1 GHz systems.
From your experience, what are the primary risks or limitations associated
with using lower-specification tubes — for example, tubes nominally
rated for 300 MHz — on a 600 MHz instrument, particularly for
quantitative applications such as determining composition and concentration
through signal integration in different samples?
I would greatly appreciate any guidance regarding acceptable tolerances,
observed deviations, or practical trade-offs.
Best regards,
Weixing Zhang
________________________________
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--
==========================
==========================
====================
Clemens Anklin Ph.D. Vice President
Bruker BioSpin NMR Applications & Training
15 Fortune Drive NEW Phone: 978-313-5NMR(5667)
Billerica MA 01821 bluesky: _at_canklin.bsky.social
web: http://www.bruker.com
e-mail: clemens.anklin_at_bruker.com
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==========================
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Received on Wed May 20 2026 - 05:58:46 MST