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Ordens não inteiras em cinética química

2010; Brazilian Chemical Society; Volume: 33; Issue: 6 Linguagem: Inglês

10.1590/s0100-40422010000600035

1678-7064

André P. Oliveira, Roberto B. Faria,

Enzyme Catalysis and Immobilization

NON-INTEGER ORDERS IN CHEMICAL KINETICS.Starting from zero-, first-, and second-order integrated laws for chemical kinetics, some cases are shown which produce fractional orders.Taking the Michaelis-Menten mechanism as a first example, it is shown that substrate order can go from 1 to zero, depending on relative concentration of enzyme and substrate.Using other examples which show fractional orders higher than one and even negative (inhibition), it is shown that the presence of an equilibrium before or parallel to the rate determining step can be the reason for fractional orders, which is an indication of a more complex mechanism.