A colorimetric LDH assay provides a method to measure the enzyme
activity of LDH. NADH (MW 633.4 g/mol) absorbs light at 340 nm
while NAD+ does not show any absorption at that wavelength. The
Beer-Lambert Law relates the absorbance of a solute to its
concentration: A = ε*c*L A is absorbance, ε is the molar extinction
coefficient, c is concentration, and L is the path length of the
solution in the spectrophotometer (usually in cm). In the lab you
have...