What is triton?
What are the effect of triton on the activities of lactase dehydrogenase, malate dehydrogenase and succinate dehydrogenase
Triton X-100 is a relatively mild non-denaturing detergent which, in terms of cell biology at least, can be used at low concentrations to provide a solution which will cause cell lysis. I'm not sure about the effects of TritonX on the latter two enzymes that you mention, but I have commonly used TritonX as a positive control to lyse cells when quantifying LDH release and it does not appear to interfere with the detection of LDH at all. Biological effects may be another story...
Any detergent will disrupt the tertiary structure of a protein interfering with hydrophobic interactions amongst the aminoacids.
Triton X-100 is nonionic and is relatively weaker detergent as compared to SDS or other like CHAPS etc.
according to this link a milder conc of triton used over here is for release of LDH.