Radical-induced hetero-nuclear mixing and low-field ¹³C relaxation in solid pyruvic acid

Abstract

Radicals serve as a source of polarization in dynamic nuclear polarization, but may also act as polarization sink, in particular at low field. Additionally, if the couplings between the electron...

Real-Time Monitoring of Hydrolysis Reactions of Pyrophosphates with Dissolution Dynamic Nuclear Polarization

“…where T 1, X is the spin−lattice relaxation time for material X under the experimental conditions, which includes radicalmediated proton−carbon mixing, 47 θ is the tip pulse angle, and τ is the time step of the tip pulse. The value of k eff is obtained by fitting the measured values to eqs 1 and ( 2).…”

“…When an enzyme induces a chemical reaction from reactant R to product P, the solution of the rate equation for the spectral signal intensity M X ( t ) (X = R or P) during d -DNP is expressed as where k eff is the first order reaction rate constant from R to P. R X rf is the pseudorelaxation rate constant due to the spin–lattice relaxation and the tip pulse of the nuclear spin of material X, where T 1, X is the spin–lattice relaxation time for material X under the experimental conditions, which includes radical-mediated proton–carbon mixing, θ is the tip pulse angle, and τ is the time step of the tip pulse. The value of k eff is obtained by fitting the measured values to eqs and ().…”