scholarly journals Indirect detection of intermediate in decarboxylation reaction of phenylglyoxylic acid by hyperpolarized 13C NMR

2020 ◽  
Vol 56 (95) ◽  
pp. 15000-15003
Author(s):  
Jiwon Kim ◽  
Yaewon Kim ◽  
Quy Son Luu ◽  
Jihyun Kim ◽  
Chang Qi ◽  
...  
Keyword(s):  
Real Time ◽  
Chemical Reactions ◽  
13C Nmr ◽  
Nuclear Spin ◽  
Indirect Detection ◽  
Reaction Intermediates ◽  
Phenylglyoxylic Acid ◽  
Hyperpolarized 13C ◽  
Decarboxylation Reaction ◽  
Nmr Signals

Nuclear spin hyperpolarization is used to enhance NMR signals for observation of chemical reactions in real-time. Here, we introduce a blind saturation technique, which enables the indirect detection of otherwise unobservable reaction intermediates.

scholarly journals Photogenerated Radical in Phenylglyoxylic Acid for in Vivo Hyperpolarized 13C MR with Photosensitive Metabolic Substrates

2018 ◽  
Vol 140 (43) ◽  
pp. 14455-14463 ◽  
Author(s):  
Irene Marco-Rius ◽  
Tian Cheng ◽  
Adam P. Gaunt ◽  
Saket Patel ◽  
Felix Kreis ◽  
...  
Keyword(s):  
Phenylglyoxylic Acid ◽  
Hyperpolarized 13C ◽  
Metabolic Substrates

scholarly journals IDENTIFICATION AND SEQUENCING BY NMR SPECTROSCOPY OF THE CARBOHYDRATE MOIETY IN A SAPONIN FROM Barringtonia asiatica

2010 ◽  
Vol 1 (3) ◽  
pp. 120-124
Author(s):  
Rymond J Rumampuk
Keyword(s):  
Nmr Spectroscopy ◽  
13C Nmr ◽  
Coupling Constants ◽  
Carbohydrate Moiety ◽  
Glycosidic Linkage ◽  
1H And 13C Nmr ◽  
Heteronuclear Correlation ◽  
Vicinal Coupling Constants ◽  
Nmr Signals

A trisaccharide chain in a saponin from the seeds of Barringtonia asiatica has been identified and sequenced as {[b-D-galactopyranosyl(1®3)- b-D-glucopyranosyl(1®2)]-b-D-glucuronopyranosyloxy} using a combination of homonuclear and heteronuclear correlation NMR spectroscopy. The 1H and 13C NMR signals of the sugar residues can be determined and distinguished from one other by use of the HMQC-TOCSY technique. Anomeric configurations were unambiguously assigned from the vicinal coupling constants 3JH-1,H-2 of the anomeric protons. Inter-glycosidic linkage assignments were elucidated using  HMBC.   Keyword: Barringtonia asiatica, carbohydrate, saponin, NMR

Real-time measurements of reaction intermediates and adsorbed species in heterogeneous catalytic reaction systems

1992 ◽  
Vol 47 (9-11) ◽  
pp. 2781-2786 ◽  
Author(s):  
A. Tolia ◽  
T. Wilke ◽  
M.J. Weaver ◽  
C.G. Takoudis
Keyword(s):  
Real Time ◽  
Catalytic Reaction ◽  
Reaction Intermediates ◽  
Heterogeneous Catalytic Reaction ◽  
Adsorbed Species ◽  
Reaction Systems ◽  
Heterogeneous Catalytic

scholarly journals Real‐time femtosecond probing of ‘‘transition states’’ in chemical reactions

1987 ◽  
Vol 87 (4) ◽  
pp. 2395-2397 ◽  
Author(s):  
Marcos Dantus ◽  
Mark J. Rosker ◽  
Ahmed H. Zewail
Keyword(s):  
Real Time ◽  
Chemical Reactions ◽  
Transition States

scholarly journals Oleic Acid Is not the Only Relevant Mono-Unsaturated Fatty Ester in Olive Oil

Foods ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 384 ◽  
Author(s):  
Archimede Rotondo ◽  
Giovanna Loredana La Torre ◽  
Giacomo Dugo ◽  
Nicola Cicero ◽  
Antonello Santini ◽  
...  
Keyword(s):  
Olive Oil ◽  
13C Nmr ◽  
Virgin Olive Oil ◽  
Fatty Ester ◽  
Extra Virgin Olive Oil ◽  
Fatty Esters ◽  
Flame Ionization ◽  
Nmr Data ◽  
Capparis Spinosa ◽  
Nmr Signals

(1) Background: Extra-virgin olive oil (EVOO) is a precious and universally studied food matrix. Recently, the quantitative chemical composition was investigated by an innovative processing method for the nuclear magnetic resonance (NMR) experiments called Multi-Assignment Recovered Analysis (MARA)-NMR. (2) Methods: Any EVOO 13-carbon NMR (13C-NMR) profile displayed inconsistent signals. This mismatch was resolved by comparing NMR data to the official gas-chromatographic flame ionization detection (GC-FID) experiments: the analyses concerned many EVOOs but also the “exotic” Capparis spinosa oil (CSO). (3) Results: NMR and GC-FID evidenced the overwhelming presence of cis-vaccenic esters in the CSO and, more importantly, cis-vaccenic 13C-NMR resonances unequivocally matched the misunderstood 13C-NMR signals of EVOOs. The updated assignment revealed the unexpected relevant presence of cis-vaccenic ester (around 3%) in EVOOs; it was neglected, so far, because routine and official GC-FID profiles did not resolve oleic and cis-vaccenic signals leading to the total quantification of both monounsaturated fatty esters. (4) Conclusions: The rebuilt MARA-NMR and GC-FID interpretations consistently show a meaningful presence of cis-vaccenic esters in EVOOs, whose content could be a discrimination factor featuring specific cultivar or geographical origin. The study paves the way toward new quantification panels and scientific research concerning vegetable oils.

Automatic Assignment of 13C NMR Signals

1987 ◽  
Vol 268O (1) ◽  
Author(s):  
I. P. Bangov ◽  
Th. Steiger ◽  
R. Radeglia
Keyword(s):  
13C Nmr ◽  
Automatic Assignment ◽  
Nmr Signals

Techniques-MRS, fMRI, 13C NMR, Indirect Detection of 13C

2005 ◽  
pp. 31-52
Author(s):  
Robin de Graaf
Keyword(s):  
13C Nmr ◽  
Indirect Detection

ChemInform Abstract: New N-(Arylsulfonyl)-5-aminomethylbicyclo[2.2.1]hept-2-enes. Synthesis, 1H and 13C NMR Spectra, and Chemical Reactions.

ChemInform ◽  
2010 ◽  
Vol 33 (46) ◽  
pp. no-no
Author(s):  
A. O. Kas'yan ◽  
A. K. Isaev ◽  
L. I. Kas'yan
Keyword(s):  
Chemical Reactions ◽  
13C Nmr ◽  
Nmr Spectra ◽  
13C Nmr Spectra ◽  
1H And 13C Nmr

The assignment of 13C NMR signals of cis-[CoYY(en-15N,15N)2]n+ (YY = (CN)2, phen, (NO2)2, and ox)

1984 ◽  
Vol 58 (3) ◽  
pp. 473-476
Author(s):  
Yuzo Yoshikawa ◽  
Yuichi Masuda ◽  
Hideo Yamatera ◽  
Shunji Utsuno ◽  
Yoshiaki Nakashima
Keyword(s):  
13C Nmr ◽  
Nmr Signals
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