Related ArticlesCombined chemometric analysis of (1)H NMR, (13)C NMR and stable isotope data to differentiate organic and conventional milk.
Food Chem. 2015 Dec 1;188:1-7
Authors: Erich S, Schill S, Annweiler E, Waiblinger HU, Kuballa T, Lachenmeier DW, Monakhova YB
Abstract
The increased sales of organically produced food create a strong need for analytical methods, which could authenticate organic and conventional products. Combined chemometric analysis of (1)H NMR-, (13)C NMR-spectroscopy data, stable-isotope data (IRMS) and ?-linolenic acid content (gas chromatography) was used to differentiate organic and conventional milk. In total 85 raw, pasteurized and ultra-heat treated (UHT) milk samples (52 organic and 33 conventional) were collected between August 2013 and May 2014. The carbon isotope ratios of milk protein and milk fat as well as the ?-linolenic acid content of these samples were determined. Additionally, the milk fat was analyzed by (1)H and (13)C NMR spectroscopy. The chemometric analysis of combined data (IRMS, GC, NMR) resulted in more precise authentication of German raw and retail milk with a considerably increased classification rate of 95% compared to 81% for NMR and 90% for IRMS using linear discriminate analysis.
[NMR paper] Rapid milk group classification by 1H NMR analysis of Le and H epitopes in human milk oligosaccharide donor samples.
Rapid milk group classification by 1H NMR analysis of Le and H epitopes in human milk oligosaccharide donor samples.
Related Articles Rapid milk group classification by 1H NMR analysis of Le and H epitopes in human milk oligosaccharide donor samples.
Glycobiology. 2014 Apr 29;
Authors: van Leeuwen SS, Schoemaker RJ, Gerwig GJ, van Leusen-van Kan EJ, Dijkhuizen L, Kamerling JP
Abstract
Human milk oligosaccharides (HMOs) are a major constituent of human breast milk and play an important role in reducing the risk of infections in...
nmrlearner
Journal club
0
05-03-2014 10:42 PM
Journal Highlight: 1H and 13C NMR-based sugar profiling with chemometric analysis and antioxidant activity of herbhoneys and honeys
Journal Highlight: 1H and 13C NMR-based sugar profiling with chemometric analysis and antioxidant activity of herbhoneys and honeys
http://www.spectroscopynow.com/common/images/thumbnails/1447e6dff3b.jpg1H and 13C NMR spectroscopy coupled with chemometric analysis (PCA and PLS-DA) and antioxidant assays were used to study 25 samples of Polish herbhoneys and honeys.
Read the rest at Spectroscopynow.com
nmrlearner
General
0
03-03-2014 04:55 PM
[NMR paper] Broadband homonuclear correlation spectroscopy driven by combined R2n(v) sequences under fast magic angle spinning for NMR structural analysis of organic and biological solids.
Broadband homonuclear correlation spectroscopy driven by combined R2n(v) sequences under fast magic angle spinning for NMR structural analysis of organic and biological solids.
Related Articles Broadband homonuclear correlation spectroscopy driven by combined R2n(v) sequences under fast magic angle spinning for NMR structural analysis of organic and biological solids.
J Magn Reson. 2013 Apr 28;232C:18-30
Authors: Hou G, Yan S, Trébosc J, Amoureux JP, Polenova T
Abstract
We recently described a family of experiments for R2n(v) Driven Spin...
nmrlearner
Journal club
0
05-21-2013 02:34 PM
[NMR paper] Broadband Homonuclear Correlation Spectroscopy Driven by Combined R2nv Sequences under Fast Magic Angle Spinning for NMR Structural Analysis of Organic and Biological Solids
Broadband Homonuclear Correlation Spectroscopy Driven by Combined R2nv Sequences under Fast Magic Angle Spinning for NMR Structural Analysis of Organic and Biological Solids
Publication date: Available online 28 April 2013
Source:Journal of Magnetic Resonance</br>
Author(s): Guangjin Hou , Si Yan , Julien Trebosc , Jean-Paul Amoureux , Tatyana Polenova</br>
We recently described a family of experiments for R2 n v Driven Spin Diffusion (RDSD) spectroscopy suitable for homonuclear correlation experiments under fast MAS conditions (J. Am. Chem. Soc., 133, 2011,...
nmrlearner
Journal club
0
04-29-2013 06:00 AM
NMR-based stable isotope resolved metabolomics in systems biochemistry
NMR-based stable isotope resolved metabolomics in systems biochemistry
Abstract An important goal of metabolomics is to characterize the changes in metabolic networks in cells or various tissues of an organism in response to external perturbations or pathologies. The profiling of metabolites and their steady state concentrations does not directly provide information regarding the architecture and fluxes through metabolic networks. This requires tracer approaches. NMR is especially powerful as it can be used not only to identify and quantify metabolites in an unfractionated mixture such...
nmrlearner
Journal club
0
03-03-2011 02:06 AM
Long-Term-Stable Ether-Lipid vs Conventional Ester-Lipid Bicelles in Oriented Solid-State NMR: Altered Structural Information in Studies of Antimicrobial Peptides.
Long-Term-Stable Ether-Lipid vs Conventional Ester-Lipid Bicelles in Oriented Solid-State NMR: Altered Structural Information in Studies of Antimicrobial Peptides.
Long-Term-Stable Ether-Lipid vs Conventional Ester-Lipid Bicelles in Oriented Solid-State NMR: Altered Structural Information in Studies of Antimicrobial Peptides.
J Phys Chem B. 2011 Feb 10;
Authors: Bertelsen K, Vad B, Nielsen EH, Hansen SK, Skrydstrup T, Otzen DE, Vosegaard T, Nielsen NC
Recently, ether lipids have been introduced as long-term stable alternatives to the more natural,...
nmrlearner
Journal club
0
02-12-2011 05:26 PM
Stable-isotope-assisted NMR approaches to glycoproteins using immunoglobulin G as a m
Stable-isotope-assisted NMR approaches to glycoproteins using immunoglobulin G as a model system.
Related Articles Stable-isotope-assisted NMR approaches to glycoproteins using immunoglobulin G as a model system.
Prog Nucl Magn Reson Spectrosc. 2010 May;56(4):346-59
Authors: Kato K, Yamaguchi Y, Arata Y
nmrlearner
Journal club
0
10-19-2010 04:51 PM
Stable-isotope-assisted NMR approaches to glycoproteins using immunoglobulin G as a m
Stable-isotope-assisted NMR approaches to glycoproteins using immunoglobulin G as a model system
Publication year: 2010
Source: Progress in Nuclear Magnetic Resonance Spectroscopy, In Press, Accepted Manuscript, Available online 19 March 2010</br>
Koichi, Kato , Yoshiki, Yamaguchi , Yoji, Arata</br>
More...
Combined chemometric analysis of (1)H NMR, (13)C NMR and stable isotope data to differentiate organic and conventional milk.
Linear Mode
