1. 🔬 Scientific Research and Testing
• Biochemical Research Tools
Used as standard reagents or key components in fundamental life science research, such as studies on energy metabolism, cellular respiration, and enzyme kinetics.
• Pyruvate Assay
Utilizes its catalytic properties in the reversible reaction between pyruvate and lactate for quantitative detection of pyruvate concentration in vitro.
• Cytotoxicity Testing
In cell culture experiments, the extent of cell damage caused by drugs, chemicals, etc., is assessed by detecting the LDH activity released into the culture medium.

2. 🏥 Medical Diagnostic Applications
• Disease Auxiliary Diagnostic Biomarker
Diseases such as myocardial infarction, leukemia, liver disease, and muscle damage cause cell damage, leading to the release of LDH into the bloodstream. Therefore, total LDH activity and isoenzyme analysis in the blood are commonly used clinical auxiliary diagnostic indicators. For example, LDH can be used in the diagnosis of myocardial infarction and leukemia.

• Cancer Prognosis Assessment
In some cancers (such as advanced gastric cancer), higher pre-treatment serum LDH levels may indicate a poorer prognosis for the patient.

3. 🏭 Industrial Production and Biotechnology
• Key Enzyme in Lactic Acid Fermentation
In the microbial fermentation of lactic acid (especially L-lactic acid) by lactic acid bacteria, LDH is a core enzyme that catalyzes the production of lactic acid from pyruvate, significantly impacting yield and enantioselectivity.

• Chiral Compound Synthesis
Utilizes its stereoselective catalytic ability to participate in the synthesis of fine chemicals such as chiral hydroxy acids with specific optical activity.