Identification of l-Tryptophan by down-field ¹ H MRS: A precursor for brain NAD⁺ and serotonin syntheses.

ABSTRACT:

Purpose

To explore the presence of new resonances beyond 9.4 ppm from the human brain, down-field proton MRS was performed in vivo in the human brain on 6 healthy volunteers at 7 T.

Methods

To maximize the SNR, a large voxel was placed within the brain to cover the maximal area in such a way that sinus cavities were avoided. A spectrally selective 90° E-BURP pulse with an excitation bandwidth of 2 ppm was used to probe the spectral chemical shift range between 9.1 and 10.5 ppm. The E-BURP pulse was integrated with PRESS spatial localization to obtain non-water-suppressed proton MR spectra from the desired spectral region.

Results

In the down-field proton MRS obtained from all of the volunteers scanned, we identified a new peak consistently resonating at 10.1 ppm. Prot

SUBMITTER: Nanga RPR 

PROVIDER: S-EPMC10165892 | biostudies-literature | 2022 Dec

REPOSITORIES: biostudies-literature