Rapid determination of the fat content in packaged dairy products by unilateral NMR

Veliyulin, Emil; Mastikhin, Igor V.; Marble, Andrew E.; Balcom, Bruce J.

doi:10.1002/jsfa.3391

Cited by 26 publications

(14 citation statements)

References 19 publications

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“…The magnet spacings are optimized to produce a locally homogeneous field in this region creating a relatively large MR sensitive volume above the surface RF coil (b). The resonance frequency of the NMR system is 4.68 MHz and all pulse lengths are about of 8 μs with 6 dB attenuation for the 90° pulse and no attenuation for the 180° pulse [22,28].…”

Section: Portable Single-sided Nmr Sensors With Open Geometrymentioning

confidence: 99%

“…A new procedure for rapid and non-destructive determination of the fat content in dairy products has been proposed by Veliyulin et al [28]. In this work, a novel design of unilateral NMR instrument with larger measurement volume and higher signal to noise ratio [22,27] has allowed to reduce the time measurement of the fat content in packaged dairy products about up to few seconds.…”

Section: Application Of Single-sided Nmr Sensors To Food Matricesmentioning

confidence: 99%

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Portable NMR in food analysis

Capitani

Sobolev

Tullio

et al. 2017

Chem. Biol. Technol. Agric.

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Low-field 1 H NMR relaxometry is an important tool used to investigate on the most abundant components of intact foodstuffs based on relaxation parameters and amplitude of the NMR signals. In particular, information on water compartments, diffusion and movement can be obtained by detecting proton signals prevalently ascribable to H 2 O contained in foodstuffs. The main advantage of this technique is that it does not require any pretreatment of the sample and once developed, standard protocols based on rapid measurements can be easily transferred to quality control applications. An actual breakthrough for the low-field NMR application to food science has certainly been the development of unilateral NMR sensors. These devices present an attractive option for non-invasive assessment of compositional and microstructure of food materials. They are portable and allow easy sample access, which makes them attractive for quality control in industrial environments and directly on sealed packaged foods. A price to pay is the inhomogeneity of the magnetic field, which compromises the sensitivity of these devices. However, recent developments in unilateral magnets design offer larger sensitive volume, higher sensitivity and shorter dead times. In this brief review, we highlight the different uses of unilateral NMR devices in food analysis.

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Section: Portable Single-sided Nmr Sensors With Open Geometrymentioning

confidence: 99%

Section: Application Of Single-sided Nmr Sensors To Food Matricesmentioning

confidence: 99%

Portable NMR in food analysis

Capitani

Sobolev

Tullio

et al. 2017

Chem. Biol. Technol. Agric.

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“…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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“…The noninvasive, nondestructive nature of single-sided NMR combined with the ability to study different size and geometry samples is what makes single-sided NMR attractive for a variety of food applications. Relaxometry and diffusion measurements have previously been used to measure the fat content in food products such as dairy, fish, ground meat, margarine, and mayonnaise (Guthausen et al, 2004;Petrov, Hay, Mastikhin, & Balcom, 2008;Veliyulin, Mastikhin, Marble, & Balcom, 2008;Veliyulin, van der Zwaag, Burk, & Erikson, 2005). Single-sided NMR has also been used to explore the adulteration of virgin olive oil as well as the water loss during the drying process of pears (Adilettaa et al, 2015;Xu, Morris, Bencsik, & Newton, 2014).…”

Section: Introductionmentioning

confidence: 99%

Noninvasive, Nondestructive Measurement of Tomato Concentrate Spoilage in Large‐Volume Aseptic Packages

Martin

Balcom

McCarthy

et al. 2019

Journal of Food Science

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Low frequency nuclear magnetic resonance (NMR) is used to noninvasively and nondestructively detect spoiled tomato concentrate stored in >200 L metal‐lined containers. It is shown that longitudinal and transverse NMR relaxation times change as the tomato concentrate spoils. A rapid, viscosity‐dependent spoilage detection method that takes advantage of the inherent inhomogeneity in single‐sided NMR instruments is proposed. Here, the effective transverse magnetization decay rate is used as a parameter to determine tomato concentrate spoilage. Three different low frequency, single‐sided NMR instruments are described and compared to determine the optimum sensor for spoiled tomato concentrate detection in large‐format, metal‐lined, aseptic containers. The most effective NMR sensor for this application is temperature stable and has large magnetic field gradients and a homogeneous magnetic field region offset >0.5 cm from the magnet surface. Practical Application This manuscript describes a noninvasive and nondestructive tomato concentrate spoilage detector for application to large‐format, sealed, commercial storage bins.

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Rapid determination of the fat content in packaged dairy products by unilateral NMR

Cited by 26 publications

References 19 publications

Portable NMR in food analysis

Portable NMR in food analysis

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

Noninvasive, Nondestructive Measurement of Tomato Concentrate Spoilage in Large‐Volume Aseptic Packages

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