A study of spin-lattice relaxation rates of glucose, fructose, sucrose and cherries using high-T-c SQUID-based NMR in ultralow magnetic fields

作者：Liao Shu Hsien^*; Wu Pei Che

来源：Superconductor Science and Technology, 2017, 30(8): 084006.

DOI：10.1088/1361-6668/aa73ab

• low-field NMR
• spin-lattice relaxation time
• sweetness detection

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 similar to 97 mu T. The detected NMR signal, Sy(TBp), is fitted to [1-exp(-T-Bp/T-1)] to derive T-1(-1), where Sy(TBp) is the strength of the NMR signal, TBp 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(-1) versus degrees Brix curve provides a basis for determining unknown Brix values for cherries as well as other fruits.

• 出版日期2017-8