TY - JOUR
T1 - A study of spin-lattice relaxation rates of glucose, fructose, sucrose and cherries using high-T c SQUID-based NMR in ultralow magnetic fields
AU - Liao, Shu Hsien
AU - Wu, Pei Che
N1 - Funding Information:
The authors acknowledge valuable discussions with Professor Hong-Chang Yang and this work is supported by the Ministry of Science and Technology of Taiwan under grant numbers 102-2112-M-003-008-MY2, 104-2112-M-003 -005 and by ‘Aim for the Top University Plan’ of the National Taiwan Normal University and the Ministry of Education, Taiwan, R. O.C. under grant numbers 104J1A27 and 105J1A27.
Publisher Copyright:
© 2017 IOP Publishing Ltd.
PY - 2017/7/5
Y1 - 2017/7/5
N2 - We study the concentration dependence of spin-lattice relaxation rates, T 1 -1, of glucose, fructose, sucrose and cherries by using high-T c SQUID-based NMR at magnetic fields of ∼97 μT. The detected NMR signal, Sy (T Bp), is fitted to [1 - exp(-T Bp/T 1)] to derive T 1 -1, where Sy (T Bp) is the strength of the NMR signal, T Bp is the duration of pre-polarization and T 1 -1 is the spin-lattice relaxation rate. It was found that T 1 -1 increases as the sugar concentrations increase. The increased T 1 -1 is due to the presence of more molecules in the surroundings, which increases the spin-lattice interaction and in turn enhances T 1 -1. The T 1 -1versus degrees Brix curve provides a basis for determining unknown Brix values for cherries as well as other fruits.
AB - We study the concentration dependence of spin-lattice relaxation rates, T 1 -1, of glucose, fructose, sucrose and cherries by using high-T c SQUID-based NMR at magnetic fields of ∼97 μT. The detected NMR signal, Sy (T Bp), is fitted to [1 - exp(-T Bp/T 1)] to derive T 1 -1, where Sy (T Bp) is the strength of the NMR signal, T Bp is the duration of pre-polarization and T 1 -1 is the spin-lattice relaxation rate. It was found that T 1 -1 increases as the sugar concentrations increase. The increased T 1 -1 is due to the presence of more molecules in the surroundings, which increases the spin-lattice interaction and in turn enhances T 1 -1. The T 1 -1versus degrees Brix curve provides a basis for determining unknown Brix values for cherries as well as other fruits.
KW - Low-field NMR
KW - spinlattice relaxation time
KW - sweetness detection
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U2 - 10.1088/1361-6668/aa73ab
DO - 10.1088/1361-6668/aa73ab
M3 - Article
AN - SCOPUS:85029476513
SN - 0953-2048
VL - 30
JO - Superconductor Science and Technology
JF - Superconductor Science and Technology
IS - 8
M1 - 084006
ER -