Moisture Determination, Determination of Water by Nuclear Magnetic Absorption in Potato and Apple Tissue

Shaw, T. M.; Elsken, R. H.

doi:10.1021/jf60060a008

Cited by 17 publications

(8 citation statements)

References 4 publications

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“…The ability to differentiate between states of matter, particularly bound and unbound water, prompted many agricultural, industrial and food based applications in CW-NMR. Early examples of this looked at signal amplitude to evaluate the water content of foodstuffs such as apple and potato [47]. An interesting example [48] also presented an experiment where the proton signal in coal is first determined before the sample is wetted.…”

Section: Amplitude Measurementsmentioning

confidence: 99%

Advances in Electronics Prompt a Fresh Look at Continuous Wave (CW) Nuclear Magnetic Resonance (NMR)

2017

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Continuous Wave Nuclear Magnetic Resonance (CW-NMR) was a popular method for sample interrogation at the birth of magnetic resonance but has since been overlooked by most in favor of the now more popular pulsed techniques. CW-NMR requires relatively simple electronics although, for most designs, the execution is critical to the successful implementation and sensitivity of the system. For decades there have been reports in the literature from academic groups showing the potential of magnetic resonance relaxation time measurements in industrial applications such as the production of food and drink. However, the cost, complexity and power consumption of pulsed techniques have largely consigned these to the literature. Advances in electronics and developments in permanent magnet technology now require a fresh look at CW-NMR to see if it is capable of providing cost effective industrial solutions. In this article, we review the electronics that are needed to undertake a continuous wave NMR experiment starting with early designs and journeying through the literature to understand the basic designs and limitations. We then review the more recent developments in this area and present an outlook for future work in the hope that more of the scientific community will take a fresh look at CW-NMR as a viable and powerful low-cost measurement technique.

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Section: Amplitude Measurementsmentioning

confidence: 99%

Advances in Electronics Prompt a Fresh Look at Continuous Wave (CW) Nuclear Magnetic Resonance (NMR)

2017

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“…The resonance frequency lies in the megacycle range, and can be calculated if the applied magnetic field, tic, is known by using the following formula, o, = ~Ho [1] where y is the magnetogyrie ratio of the nucleus. Each magnetic nucleus has a unique value for ~ and these have been tabulated (8).…”

Section: Theorymentioning

confidence: 99%

“…Shaw, Conway and others (1,2) have shown the applicability of a wide line NMR method for the determination of moisture in various solids. Conway, Fcrren, Chapman and others (3)(4)(5)(6) have obtained the same degree of success in the determination of the oil content of various substances.…”

Section: Introductionmentioning

confidence: 99%

Fat content and liquid‐to‐solid ratio of chocolate by wide line nuclear magnetic resonance

Oref

1965

J Americ Oil Chem Soc

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Wide line nuclear magnetic resonance (NMR) was used for fast and accurate determination of the fat content and liquid-to-solid ratio of chocolate. The transition range of solid to liquid was found to be extremely narrow. The temp effect on the NMR signal is discussed and correction methods are suggested to that effect. A method was developed for the separate determination of butter fat and cocoa fat in addition to the total fat content determination in lnilk chocolate.

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“…F OLLOWING DEVELOPMENT by Shaw and co-workers (8) of broad-band nuclear magnetic resonance (NMR) procedures for the determination of moisture in vegetables, the technique has been used effectively for moisture in products obtained from the commercial wet milling of corn (3). The early suggestion (1) that NMR might provide a rapid method for determining oil content of plant materials has been proved by an extensive study of corn, corn germ, and germ process samples (4).…”

Section: Introductionmentioning

confidence: 99%

Nuclear magnetic resonance for determining oil content of seeds

Conway

Earle

1963

J Americ Oil Chem Soc

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Twelve seed oils containing a variety of functional groups were examined with a commercial broad-band nuclear magnetic resonance (NMR) spectrometer. Instrument response (integrator readout) was directly related to hydrogen content of the oil (r = 0.999), regardless of the structures present.NMR techniques were applied to the determination of oil in intact, partially dried seeds from 18 plant species containing 1.5-53% oil having a variety of structures. The correlation between integrator readout (calculated to a uniform 25-g sample weight) and oil content (determined by extraction with petroleum ether) is excellent (r= 0.993). If the readout is further modified by a correction for the variation in hydrogen content of the oils, the correlation becomes 0.996.

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Moisture Determination, Determination of Water by Nuclear Magnetic Absorption in Potato and Apple Tissue

Cited by 17 publications

References 4 publications

Advances in Electronics Prompt a Fresh Look at Continuous Wave (CW) Nuclear Magnetic Resonance (NMR)

Advances in Electronics Prompt a Fresh Look at Continuous Wave (CW) Nuclear Magnetic Resonance (NMR)

Fat content and liquid‐to‐solid ratio of chocolate by wide line nuclear magnetic resonance

Nuclear magnetic resonance for determining oil content of seeds

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