The five isoenzymes of potato (Solanum tuberasum) lactate dehydrogenase have been resolved by affinity chromatography. Mixtures of isoenzymes LDH-1 and LDH-5 dissociate and reassociate during freezing and thawing to produce five isoenzymes. These results indicate that potato lactate dehydrogenase isoenzymes are primary isoenzymes of the vertebrate type, which are composed of two subunit types.
