Abstract:

Lactate dehydrogenase exists widely in human and animal tissues and body fluids. Due to the temperature influence in different processing technologies, the activity of lactate dehydrogenase was different in pasteurized milk, ultra-high temperature- treated milk and reconstituted milk. A commercially available lactate dehydrogenase kit was used to determine the activity of lactate dehydrogenase in pasteurized milk, ultra-high temperature-treated milk and reconstituted milk for identifying reconstituted milk. Results indicated that the activity of lactate dehydrogenase of pasteurized milk was significantly higher than those of ultra-high temperature-treated milk and reconstituted milk. This method is of easy operation, rapidity and high accuracy and consequently, deserves to be popularized.

Key words: lactate dehydrogenase, pasteurized milk, ultra-high temperature treated milk, reconstituted milk