<scp>NMR</scp> relaxometry study of development of freeze damage in mandarin orange

Zhang, Lu; McCarthy, Michael J.

doi:10.1002/jsfa.7491

Cited by 17 publications

(6 citation statements)

References 20 publications

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“…Time‐domain NMR with tabletop instruments is extensively used by the food industry to determine the solid‐fat content and droplet‐size distributions in foods and emulsions and for liquid typing and quantification such as oil in olives whereby the sample is inserted into the magnet . Centerfield magnets have also been employed to study living plants in greenhouses and outdoors as well as harvest quality, whereas stray‐field magnets bear promise for characterizing the state and function of surface‐near biological tissues like skin and tendon benefitting from the mobility of the compact design . The use of stray‐field magnets has also been explored to inspect packaged food and the fat content of meat in life animals …”

Section: Laplace Nmrmentioning

confidence: 99%

Desktop NMR and Its Applications From Materials Science To Organic Chemistry

2017

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NMR spectroscopy is an indispensable method of analysis in chemistry, which until recently suffered from high demands for space, high costs for acquisition and maintenance, and operational complexity. This has changed with the introduction of compact NMR spectrometers suitable for small-molecule analysis on the chemical workbench. These spectrometers contain permanent magnets giving rise to proton NMR frequencies between 40 and 80 MHz. The enabling technology is to make small permanent magnets with homogeneous fields. Tabletop instruments with inhomogeneous fields have been in use for over 40 years for characterizing food and hydrogen-containing materials by relaxation and diffusion measurements. Related NMR instruments measure these parameters in the stray field outside the magnet. They are used to inspect the borehole walls of oil wells and to test objects nondestructively. The state-of-the-art of NMR spectroscopy, imaging and relaxometry with compact instruments is reviewed.

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Section: Laplace Nmrmentioning

confidence: 99%

Desktop NMR and Its Applications From Materials Science To Organic Chemistry

2017

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“…B. Öl in Oliven, wobei die Probe in den Magneten eingeführt wird . Zentralfeldmagnete werden auch zur Untersuchung von lebenden Pflanzen in der Natur und Gewächshäusern sowie von Erntequalität genutzt, wohingegen Streufeldmagnete vielversprechend im Hinblick auf die Charakterisierung von Zustand und Funktion von oberflächennahem biologischen Gewebe wie Haut und Sehnen sind, wobei das kompakte, mobile Design von großem Vorteil ist . Streufeldmagnete wurden ebenfalls für die Untersuchung von verpackten Lebensmitteln sowie vom Fettgehalt im Fleisch lebender Tiere erprobt …”

Section: Laplace‐nmrunclassified

NMR mit Tischgeräten und deren Anwendungen von der Materialwissenschaft bis zur organischen Chemie

Blümich

Singh

2017

Angewandte Chemie

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Die NMR‐Spektroskopie ist eine unverzichtbare Analysemethode. Bis vor kurzem erforderten die Geräte viel Platz, waren teuer und schwer zu bedienen. Dies hat sich mit der Einführung kompakter NMR‐Spektrometer geändert, die sich für die Analyse kleiner Moleküle auf der Laborbank eignen. Solche Spektrometer sind mit Permanentmagneten für 1H‐NMR‐Frequenzen zwischen 40 und 80 MHz ausgestattet. Erst seit wenigen Jahren gibt es kleine Permanentmagnete mit homogenen Magnetfeldern für hochaufgelöste Spektroskopie. Tischgeräte mit inhomogenen Feldern werden schon seit 40 Jahren zur Charakterisierung von Lebensmitteln und Materialien über Relaxations‐ und Diffusionsmessungen genutzt. Ähnliche NMR‐Geräte messen diese Parameter im Streufeld außerhalb des Magneten. Sie werden zur Untersuchung von Bohrlochwänden in Ölquellen sowie für zerstörungsfreie Analysenverwendet. Der gegenwärtige Stand von NMR‐Spektroskopie, ‐Bildgebung und ‐Relaxometrie wird hier anhand repräsentativer Beispiele beschrieben.

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“…Here the mobility and lower price of compact instruments enable systematic and simultaneous studies in greenhouses and outdoors of growth cycles in dependence of environmental impact factors (Fig. 7b, c) [72,77,78] as well the cost-efficient assessment of harvest quality [79][80][81]. A tabletop instrument has also been employed in elastographic measurements of small tissue samples to determine the storage and loss moduli [82].…”

Section: Biological Tissuementioning

confidence: 99%

Mobile and Compact NMR

Blümich

2016

Modern Magnetic Resonance

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NMR with mobile and compact devices is experiencing considerable growth in recent years in particular since instruments have become available, which are capable not only of measuring NMR relaxation but also images and highresolution spectra. Based on permanent magnet technology, compact tabletop NMR instruments measure samples of materials and solutions positioned inside the magnet, while compact mobile instruments measure material properties of intact objects and samples nondestructively in the inhomogeneous stray field outside the magnet. Following a brief introduction to NMR with homogeneous and inhomogeneous magnetic fields and to the concepts of permanent center-and stray-field NMR magnets, the evolution of the technology over the past 10 years is reviewed and illustrated with selected applications. Relaxation and diffusion measurements find use in the analysis of foods, biological tissues, polymer materials, porous media, and objects of cultural heritage. Compact imaging

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NMR relaxometry study of development of freeze damage in mandarin orange

Abstract: The relative magnitudes of relaxation components are sensitive to sub-cellular changes in mandarin flesh due to freeze damage. Thus, freeze damage in mandarin flesh can be tracked by NMR relaxometry. © 2015 Society of Chemical Industry.

Cited by 17 publications

References 20 publications

Desktop NMR and Its Applications From Materials Science To Organic Chemistry

Desktop NMR and Its Applications From Materials Science To Organic Chemistry

NMR mit Tischgeräten und deren Anwendungen von der Materialwissenschaft bis zur organischen Chemie

Mobile and Compact NMR

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