Results 61 to 70 of about 459,445 (367)

Evaluation of in vitro toxicity of common phytochemicals included in weight loss supplements using 1H NMR spectroscopy

FEBS Open Bio, EarlyView.
We investigated the toxicity of 12 active compounds commonly found in herbal weight loss supplements (WLS) using human liver and colon cell models. Epigallocatechin‐3‐gallate was the only compound showing significant toxicity. Metabolic profiling revealed protein degradation, disrupted energy and lipid metabolism suggesting that the inclusion of EGCG ...
Emily C. Davies, Garth L. Maker, Ian F. Musgrave, Samantha Lodge   +3 more
wiley   +1 more source

Nuclear magnetic resonance spectroscopy. A stereospecific ^3J_(CF) coupling in the low-temperature ^(13)C nmr spectrum of 1,1-difluorocyclohexane [PDF]

, 1970
The proton-decoupled ^(13)C nmr spectrum of 1,1-difluorocyclohexane has been examined at room temperature and at -90 degrees C. There are only minor changes in the one-bond and two-bond carbon-fluorine scalar coupling constants at the lower temperature ...
Charrier, Claude, Doddrell, David, Roberts, John D.   +2 more
core  

Three-dimensional nuclear spin positioning using coherent radio-frequency control

, 2018
Distance measurements via the dipolar interaction are fundamental to the application of nuclear magnetic resonance (NMR) to molecular structure determination, but they only provide information on the absolute distance $r$ and polar angle $\theta$ between
Cujia, K. S., Degen, C. L., Herb, K., Zopes, J.   +3 more
core   +1 more source

Structural changes in lipid-free humic acids during composting of sewage sludge [PDF]

, 2005
Structural changes in humic acids (HAs), extracted after lipid removal from sewage sludge during composting, were investigated using various chemical methods (elemental analysis, Fourier transform infrared spectroscopy and 13C-nuclear magnetic resonance
Amir, Soumia, Hafidi, Mohamed, Merlina, Georges, Revel, Jean-Claude   +3 more
core   +3 more sources

Enzymatic degradation of biopolymers in amorphous and molten states: mechanisms and applications

FEBS Open Bio, EarlyView.
This review explains how polymer morphology and thermal state shape enzymatic degradation pathways, comparing amorphous and molten biopolymer structures. By integrating structure–reactivity principles with insights from thermodynamics and enzyme engineering, it highlights mechanisms that enable efficient polymer breakdown.
Anđela Pustak, Aleksandra Maršavelski
wiley   +1 more source

C2α‐carbanion‐protonating glutamate discloses tradeoffs between substrate accommodation and reaction rate in actinobacterial 2‐hydroxyacyl‐CoA lyase

FEBS Open Bio, EarlyView.
Enzymes of the 2‐hydroxyacyl‐CoA lyase group catalyze the condensation of formyl‐CoA with aldehydes or ketones. Thus, by structural adaptation of active sites, practically any pharmaceutically and industrially important 2‐hydroxyacid could be biotechnologically synthesized. Combining crystal structure analysis, active site mutations and kinetic assays,
Michael Zahn, Barbara Seroka, Ryszard Lazny, Zenon Lotowski, Thore Rohwerder   +4 more
wiley   +1 more source

Synthesis of monoketo and monohydroxy eicosanoic acids and esters with substituents at odd-numbered (3-13) carbons [PDF]

Journal of the Serbian Chemical Society, 2002
In this study, monoketo and monohydroxy eicosanoic acids and their methyl esters with the position of the substituent on odd numbered carbon atoms from 3 to 13 were synthesized with high purity.
Çelik Hulya
doaj   +3 more sources

Influence of production variables and starting material on charcoal stable isotopic and molecular characteristics [PDF]

, 2008
We present a systematic study on the effect of starting species, gas composition, temperature, particle size and duration of heating upon the molecular and stable isotope composition of high density (mangrove) and low density (pine) wood.
Alemany, Antal, Antal, Atalla, Baldock, Benner, Beramendi-Orosco, Bird, Blann, C.E. Snape, Cachier, Carcaillet, Chaloner, Clark, Czimczik, Czimczik, D. Apperley, Earl, Eckmeier, Ehrlinger, Ehrlinger, Evans, Fengel, Ferrio, Gavin, Gleixner, Goebel, Hakkou, Hall, Hatcher, Inari, Irbe, Jones, Knicker, Kringstad, Krull, Labbé, Leavitt, Levine, Li, Loader, M.I. Bird, Marino, Martinez, Maunu, McCarroll, Mok, Mörck, Nogueira, Novakov, P. Wormald, P.L. Ascough, Pandey, Pessenda, Poole, Qian, Richard, Robertson, Sima-Ella, Simpson, Sivonen, Sjöström, Skjemstad, Skjemstad, Soares, Steinbeiss, Swift, Turekian, Turney, Verheyden, Völker, Werts, Wikberg, Williams, Wilson, Wormald, Xiao   +76 more
core   +1 more source

Intermolecular Interactions as Driving Force of Increasing Multiphoton Absorption in a Perylene Diimide‐Based Coordination Polymer

Advanced Functional Materials, EarlyView.
This study uncovers the unexplored role of intermolecular interactions in multiphoton absorption in coordination polymers. By analyzing [Zn2tpda(DMA)2(DMF)0.3], it shows how the electronic coupling of the chromophores and confinement in the MOF enhance two‐and three‐photon absorption.
Simon Nicolas Deger, Anna Mauri, Yang Cui, Sebastian Josef Weishäupl, Ali Deniz Özdemir, Hamad Syed, Aleksandr Ovsianikov, Wolfgang Wenzel, Alexander Pöthig, Jürgen Hauer, Mariana Kozlowska, Roland Augustinus Fischer   +11 more
wiley   +1 more source

CARBON-13 NMR OF ALIPHATIC TERTIARY AMIDES [PDF]

SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY, 1995
This work presents unpublished Carbon-13 NMR data for eight aliphatic tertiary amides. The substituent chemical shifts of the CONMe2 and CONEt2 groups were determined and can be useful in correlation analysis.
Paulo Irajara Borba Carneiro, Roberto Rittner   +1 more
openaire   +1 more source