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We report the in situ and real-time monitoring of the interconversion of L- and D-alanine-d3 by alanine racemase from Bacillus stearothermophilus directly observed by (2)H NMR spectroscopy in anisotropic phase. The enantiomers are distinguished by the difference of their (2)H quadrupolar splittings in a chiral liquid crystal containing short DNA fragments. The proof-of-principle, the reliability, and the robustness of this new method is demonstrated by the determination of the turnover rates of the enzyme using the Michaelis-Menten model.

“On-the-Fly” Kinetics of Enzymatic Racemization Using Deuterium NMR in DNA-Based Chiral Oriented Media