Advances in Food and Nutrition Research, Vol. 48 by Steve Taylor

By Steve Taylor

Advances in nutrients and meals examine is an eclectic serial verified in 1948. The serial acknowledges the essential courting among the nutrients and dietary sciences and brings jointly amazing and entire stories that spotlight this courting. Contributions aspect the clinical advancements within the large components encompassed by way of the fields of meals technology and meals and are meant to make sure that meals scientists in academia and undefined, in addition to specialist nutritionists and dieticians, are stored proficient referring to rising learn and advancements in those very important disciplines. *Series tested considering 1948*Advisory Board includes eight revered scientists*Unique sequence because it combines foodstuff technology and foodstuff examine

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18 Schematic representation of an NMR experiment. A sample is placed in a probe containing a radio frequency coil, which is located in a strong applied magnetic field, B0. The coil is tuned to resonate at the frequency of the applied radio frequency field, B1. spinning nucleus causes precession of the magnetic moment (Figure 19), where the frequency of precession is proportional to the strength of B0: v0 ¼ gB0 ð9Þ where v0 is the angular frequency in radians per second (also called the Larmor or resonance frequency) and g is the magnetogyric ratio (rad TeslaÀ1sÀ1), which is a unique constant for each nucleus.

The ability of NMR to quantify food properties and their spatiotemporal variation in a nondestructive, noninvasive manner is especially useful. In turn, these properties can then be related to the safety, stability, and quality of a food (Eads, 1999). Because food materials are transparent to the radio frequency electromagnetic radiation required in an NMR experiment, NMR can be used to probe virtually any type of food sample, from liquids, such as beverages, oils, and broth, to semisolids, such as cheese, mayonnaise, and bread, to solids, such as flour, powdered drink mixes, and potato chips.

Detection of the loss of energy (through the process of relaxation) occurs through the same coil used for excitation. As the magnetization relaxes, it contains both a longitudinal component (along the z axis; Figure 21C) and a transverse component (in the x–y plane; Figure 21D). The magnitude of the transverse relaxing signal, as a function of time [My(t)], is called the free induction decay (FID). The FID can be analyzed directly (as discussed later) or can be Fourier transformed from the time domain into the frequency domain, yielding an NMR spectrum.

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