Novel phenomena in the 13C NMR spectra of amino acids.
13C NMR integral areas and spin-lattice relaxation times (T1's) of a series of amino acids were determined at different concentrations. It was found that the spin-lattice relaxation times were markedly reduced in 3 M magnesium chloride resulting in the integral area being proportional to the number of carbon atoms producing each particular signal, with a reliability in excess of 95%. Magnesium chloride is proposed as a 13C NMR relaxation agent for amino acids.
Tian
J
J
Department of Chemistry, 4F TH-UNIS Building II, Tsinghua University, Beijing 100084, P.R. China.
Yin
Y
Y
D000596:Amino Acids / Q000032:analysis* / Q000737:chemistry*; D002247:Carbon Isotopes; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D015394:Molecular Structure
D000596:Amino Acids; D002247:Carbon Isotopes