While some centrifuge juicers may heat the juice too much and kill the enzymes, it's not a given that a centrifuge juicer will do that.
I have a Breville and though I'm not thrilled with it (the discarded pulp contains more juice than I'd prefer - so I run the pulp back through a second time), I'm sure that there is nowhere near anough heat to damage the enzymes in the juice.