Eco-friendly TEMPO/laccase/O biocatalytic system for degradation of Indigo Carmine: operative conditions and laccase inactivation.

The biocatalytic system laccase/TEMPO/O has attracted the attention of researchers over the past two decades. A variety of applications for the system include organic synthesis, modification of cellulose, and oxidative degradation of environmental contaminants. A rigorous and predictable quantitative assessment of the change in enzymatic activity under the influence of a mediator is important for such a system.

Hydrogen Atom Transfer from Benzyl Alcohols to -Oxyl Radicals. Reactivity Parameters.

A model for predicting the rate constants of hydrogen atom transfer (HAT) from the α-C-H bond of -substituted benzyl alcohols to -oxyl radicals was proposed. To quantify the factors governing the reactivity of both -oxyl radicals and benzyl alcohols, multivariate regression analysis was performed using various combinations of reactivity parameters. The analysis was based on a 2D array of 35 HAT reactions, the rate constants of which span 4 orders of magnitude.