Lactate dehydrogenase (LDH) activity in tissue homogenates and plasma was measured by using a 2-step kit (Cayman Chemicals, Ann Arbor, Michigan). Briefly, LDH-catalyzed reduction of NAD+ to NADH by oxidation of lactate to pyruvate was coupled with reduction of tetrazolium salt to blue formazan crystals, and absorbance was monitored at 490 to 520 nm by spectrophotometry (standard curve 1 to 1,000 μU of LDH).
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