Heat-Bath Cooling of Spins in Two Amino Acids
arXiv:1108.5109 · doi:10.1016/j.cplett.2011.10.039
Abstract
Heat-bath cooling is a component of practicable algorithmic cooling of spins, an approach which might be useful for in vivo 13C spectroscopy, in particular for prolonged metabolic processes where substrates that are hyperpolarized ex-vivo are not effective. We applied heat-bath cooling to 1,2-13C2-amino acids, using the alpha protons to shift entropy from selected carbons to the environment. For glutamate and glycine, both carbons were cooled by about 2.5-fold, and in other experiments the polarization of C1 nearly doubled while all other spins had equilibrium polarization, indicating reduction in total entropy. The effect of adding Magnevist, a gadolinium contrast agent, on heat-bath cooling of glutamate was investigated.
7 pages, 4 figures, presented at the International Society for Magnetic Resonance (ISMAR) in Florence, 2010