Large format samples were contained in standard 1,000 L storage totes with a 75 ��m thick metal lining. These aluminum layered, plastic bags were short filled with tomato paste, stored at room temperature, and shipped from The Morning Star Company to UC Davis.A Tecmag Redstone NMR spectrometer was used to acquire all transient NMR relaxation signals from the small format 100 mL samples. As shown in Figure 1a, the small format samples were completely enclosed by the ��0/2�� = 4 MHz tuned and matched, 11.5 cm diameter, 20 cm long, 11 turn variable pitch inductor situated inside of a homebuilt NMR probe. This probe was mounted inside of a B0 = 980 G SMIS electromagnet with a 15.24 cm pole face separation.
A standard inversion recovery pulse sequence involving 625 W, 20 ��s ��/2 rf pulses and 21 non-linear sampled recovery times between 0 and 300 ms was used to recover T1 values while a multiple �� rf pulse Carr-Purcell-Meiboom-Gill (CPMG) pulse sequence with an 8 ms �� rf pulse separation involving the same rf pulse power and length was used to recover T2 values by non-linearly increasing the number of �� rf pulses to 60 in 18 steps. All measurements reported for this geometry did not require signal averaging and corresponded to one transient signal per relaxation time point.Figure 1.Diagrams comparing the conventional low field NMR instrument in (a) to the single sided instrument in (b). The primary difference between these two geometries is that applied rf interacts with the entire sample in (a) and only a fraction of the sample …
In the case of the large format metal-lined totes, the Tecmag Redstone NMR spectrometer was connected to an ABQMR single sided permanent magnet system. In this case the sample was not inside of the rf coil as shown in Figure 1b and the homogeneous sample volume of the B0 = 1,300 G static magnet
Author Contributions Chow-Shing Shin initialized the idea, and in charge of paper submission/revision and data measurement/analyses. He has mainly contributed to paper draft writing, response to reviewers and paper revision.Shien-Kuei Liaw investigated homemade FBGs for this work. He has partially contributed to paper draft writing, response to reviewers and paper revision. He also has partially contributed to experimental setup, data measurement/analyses and figures drawing.Shi-Wei Yang has mainly contributed to experimental setup, data measurement/analyses and figures drawing.* Author to whom correspondence should be addressed; E-Mail: wt.ude.utn@nihssc; Tel./Fax: Anacetrapib +886-233-662-724.Author information ? Article notes ? Copyright and License information ?Received December 16, 2013; Revised February 17, 2014; Accepted February 18, 2014.Copyright ? 2014 by the authors; licensee MDPI, Basel, Switzerland.
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