Breakdown products of 2702.75-84 were identified by a combination of high-performance liquid chromatography and mass spectrometry. These compounds were found to be inactive when tested in vivo. In contrast to peptides consisting of L-amino acids, peptides consisting of D-amino acids are resistant ...
Improved cognitive performance in two different prefrontal cortex- dependent tasks was observed with D-, but not L-Govadine, which strongly suggests that the D-steroisomer may be an effective cognitive enhancer. Alterations in dopamine efflux were also assessed and L-Govadine increased dopamine ...
Unfortunately, the structural elucidation and separation of these different amino acid types in peptides has been analytically challenging to date due to the numerous isomers present, limiting our knowledge about their existence and biological roles. Here, we utilized an ultrahigh resolution ion mobility...
The method, using a CD detector, does not require separation of optical isomers on a column to calculate the enantio ratio (% D) using the g-factor value and produces a simple chromatogram in comparison to other reported methods. Using this advantage, combined with UHPLC technology, analysis ...
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(and a small amount of the N-3 isomer) and purine (and a small amount of the N-7 isomer), respectively. A mixture of the latter 7- and 9-isomers rearranged exclusively to the 9-isomer on heating. Debenzylation by hydrogenation over Pearlman's catalyst and hydrolysis of the 6-...
A specific interactions of isomers of 1,1′-bi-2-naphthol (binol) with the chiral ferrocene amine to which 2-formylphenyl boronic acid was attached allowed the determination of enantiomeric excess of analyte, by recording square wave voltammograms in dichloromethane with Pt working electrode [11]....
Chemical analyses of the L- and D-isomers of alanine, serine, proline, and glycine (no D-isomer) were conducted using ultra-high-performance liquid chromatography-tandem mass spectrometry according to a validated method (Visser et al, 2011). Questionnaires During a 2-week period after the ...
Abstract:AlthoughtheaminoacidsthatbuildorganismsaremostlyL-isomers,peoplenowfindthat manyfreeD-aminoacidsexistnaturally,andtheyareplayingimportantrolesinorganisms.Thisreview summarizesthecurrentprogressesontheeffectsofD-aminoacidonbacteriaphysiologicalmetabolism. ...