Hi Weixing
HSQC's can show COSY type peaks when the acquisition time in the indirect
dimension gets long. Would these peaks by any chance align with the C4 protons?
The sequence hsqcedetgpsisp2.4 suppresses these COSY type artefacts.
Clemens
On 3/3/2026 2:38 PM, Zhang, Weixing via groups.io wrote:
Dear Colleagues,
The attached picture shows the HSQC cross-peak of C3 and C5 in natural abundance β-glucose.
Coupling to the C2 and C4 protons makes C3 appear as a triplet, but I am unsure what
the small peak located ~32 Hz to the right of the main signal represents.
Similarly, for C5 there is also a small peak on the right side, approximately
20 Hz away from the main peak.
I would appreciate any insight into the origin of these additional peaks.
Thank you in advance.
Best regards,
Weixing
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Clemens Anklin Ph.D. Vice President
Bruker BioSpin NMR Applications & Training
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e-mail: clemens.anklin_at_bruker.com
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Received on Tue Mar 03 2026 - 13:42:21 MST