An international team from Colombia and Germany has demonstrated how to use NMR spectroscopy to identify adulteration or contamination of coffee beans based on country of origin, a useful tool in the fight against food fraud in a high-value market.
Best spectroscopic technique for coffee typing
Best spectroscopic technique for coffee typing
http://www.spectroscopynow.com/common/images/thumbnails/14445372618a.jpgIR spectroscopy and LC/MS can differentiate between two coffee bean varieties using principal components analysis but CD and NMR spectroscopy both fail.
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02-19-2014 12:07 AM
[NMR paper] Dynamic Interaction Between Membrane-Bound Full-Length Cytochrome P450 and Cytochrome b5 Observed by Solid-State NMR Spectroscopy.
Dynamic Interaction Between Membrane-Bound Full-Length Cytochrome P450 and Cytochrome b5 Observed by Solid-State NMR Spectroscopy.
Dynamic Interaction Between Membrane-Bound Full-Length Cytochrome P450 and Cytochrome b5 Observed by Solid-State NMR Spectroscopy.
Sci Rep. 2013 Aug 29;3:2538
Authors: Yamamoto K, Dürr UH, Xu J, Im SC, Waskell L, Ramamoorthy A
Abstract
Microsomal monoxygenase enzymes of the cytochrome-P450 family are found in all biological kingdoms, and play a central role in the breakdown of metabolic as well as...
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08-30-2013 04:35 PM
Symmetry Break of Special Pair: Photochemically Induced Dynamic Nuclear Polarization NMR Confirms Control by Nonaromatic Substituents
Symmetry Break of Special Pair: Photochemically Induced Dynamic Nuclear Polarization NMR Confirms Control by Nonaromatic Substituents
Karthick Babu Sai Sankar Gupta, A. Alia, Huub J.M. de Groot and Jo?rg Matysik
http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/0/jacsat.ahead-of-print/ja402238w/aop/images/medium/ja-2013-02238w_0006.gif
Journal of the American Chemical Society
DOI: 10.1021/ja402238w
http://feeds.feedburner.com/~ff/acs/jacsat?d=yIl2AUoC8zA
http://feeds.feedburner.com/~r/acs/jacsat/~4/SoHEJYzuguk
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07-03-2013 01:46 PM
[NMR paper] Symmetry break of special pair: Photochemically induced dynamic nuclear polarization NMR confirms control by nonaromatic substituents.
Symmetry break of special pair: Photochemically induced dynamic nuclear polarization NMR confirms control by nonaromatic substituents.
Symmetry break of special pair: Photochemically induced dynamic nuclear polarization NMR confirms control by nonaromatic substituents.
J Am Chem Soc. 2013 Jun 6;
Authors: Sai Sankar Gupta KB, Alia A, de Groot HJ, Matysik J
Abstract
Despite the high structural symmetry of cofactor arrangement and protein environment, light-induced electron transfer in photosynthetic reaction centers (RCs) of the purple...
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06-07-2013 10:04 AM
[NMR paper] Functional characterization and NMR spectroscopy on full-length Vpu from HIV-1 prepar
Functional characterization and NMR spectroscopy on full-length Vpu from HIV-1 prepared by total chemical synthesis.
Related Articles Functional characterization and NMR spectroscopy on full-length Vpu from HIV-1 prepared by total chemical synthesis.
J Am Chem Soc. 2004 Mar 3;126(8):2439-46
Authors: Kochendoerfer GG, Jones DH, Lee S, Oblatt-Montal M, Opella SJ, Montal M
Vpu is an 81-residue integral membrane protein encoded in the HIV-1 genome that is of considerable interest because it plays important roles in the release of virus particles...
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11-24-2010 09:25 PM
[NMR paper] Proton NMR study of chemically modified horse heart ferricytochrome c confirms the pr
Proton NMR study of chemically modified horse heart ferricytochrome c confirms the presence of histidine and lysine-ligated conformers in 30% acetonitrile solution.
Related Articles Proton NMR study of chemically modified horse heart ferricytochrome c confirms the presence of histidine and lysine-ligated conformers in 30% acetonitrile solution.
J Inorg Biochem. 2003 Apr 1;94(4):381-5
Authors: Sivakolundu SG, Mabrouk PA
Comparison of the 1H NMR spectra for guanidinated ferricyt c and chloro(terpyridine)platinum(II)-modified ferricyt c in 30%...
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11-24-2010 09:01 PM
[U. of Ottawa NMR Facility Blog] NMR and Food Chemistry - Coffee
NMR and Food Chemistry - Coffee
Many of us enjoy a hot delicious cup of coffee. Many (not including myself) will even spend a great deal of money and a great deal of their time in a long queue to get it! The coffee snobs will preach about the differences between a freshly brewed cup of java and the lowly cup of instant coffee. Is there really a difference? Spectrum A in the figure below shows the 13C CPMAS NMR spectrum of ground coffee. Among other things, the spectrum consists of resonances from the woody fibers, polysaccharide gums, tannins, alkaloids and aromatic oils. Spectrum B is the...
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10-29-2010 09:32 PM
[NMR paper] NMR structure of HMfB from the hyperthermophile, Methanothermus fervidus, confirms th
NMR structure of HMfB from the hyperthermophile, Methanothermus fervidus, confirms that this archaeal protein is a histone.
http://www.ncbi.nlm.nih.gov/corehtml/query/egifs/http:--linkinghub.elsevier.com-ihub-images-PubMedLink.gif Related Articles NMR structure of HMfB from the hyperthermophile, Methanothermus fervidus, confirms that this archaeal protein is a histone.
J Mol Biol. 1996 Jan 12;255(1):187-203
Authors: Starich MR, Sandman K, Reeve JN, Summers MF
The three-dimensional structure of the recombinant histone rHMfB from Methanothermus...
Full of beans: NMR spectroscopy confirms coffee
An international team from Colombia and Germany has demonstrated how to use NMR spectroscopy to identify adulteration or contamination of coffee beans based on country of origin, a useful tool in the fight against food fraud in a high-value market.
Linear Mode
