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Lactate Dehydrogenase (LDH) Activity Assay Kit
SKU: E-BC-K046-S-100
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Lactate Dehydrogenase (LDH) Activity Assay Kit
| SKU # | E-BC-K046-S |
| Detection Instrument | Spectrophotometer (450 nm) |
| Detection Method | Colorimetric method |
Product Details
Properties
| Synonyms | LDH |
| Sample Type | Serum, plasma, tissue, cells |
| Sensitivity | 4 U/L |
| Detection Range | 4-400 U/L |
| Detection Method | Colorimetric method |
| Assay type | Enzyme Activity |
| Assay time | 70 min |
| Precision | Average inter-assay CV: 7.200% | Average intra-assay CV: 2.200% |
| Other instruments required | Micropipettor, Vortex mixer, Water bath |
| Other reagents required | Normal saline (0.9% NaCl), PBS (0.01 M, pH 7.4) |
| Storage | 2-8℃ |
| Valid period | 12 months |
Dilution of Sample
It is recommended to take 2~3 samples with expected large difference to do pre-experiment before formal experiment and dilute the sample according to the result of the pre-experiment and the detection range (4-400 U/L).
The recommended dilution factor for different samples is as follows (for reference only):
| Sample type | Dilution factor |
| Human serum | 10-15 |
| Human plasma | 10-15 |
| Porcine serum | 20-30 |
| Rat serum | 20-30 |
| Rat plasma | 20-30 |
| 10% Rat liver tissue homogenate | 800-1000 |
| 10% Mouse kidney tissue homogenate | 500-800 |
| 10% Rat lung tissue homogenate | 300-500 |
Note: The diluent is normal saline (0.9% NaCl) or PBS (0.01 M, pH 7.4).
Detection Principle
Lactate dehydrogenase (LDH) is an oxidoreductase. LDH catalyzes the conversion of lactate to pyruvic acid and back, as it converts NAD+ to NADH and back. LDH is composed of four subunits (tetramer). The two most common subunits are the LDH-M and LDH-H protein. LDH is released into the blood by cells after tissue damage or erythrocyte hemolysis. Extracellular LDH activity is used to detect cell damage or cell death.
Kit Components & Storage
| Item | Component | Size (100 Assays) | Storage |
| Reagent 1 | Substrate Buffer | 30 mL × 1 vial | 2-8°C, 12 months |
| Reagent 2 | Coenzyme I | Powder × 1 vial | 2-8°C, 12 months |
| Reagent 3 | Chromogenic Agent | 30 mL × 1 vial | 2-8°C, 12 months, shading light |
| Reagent 4 | Alkali Reagent | 30 mL × 1 vial | 2-8°C, 12 months |
| Reagent 5 | 2 µmol/mL Pyruvic Acid Standard | 5 mL × 1 vial | 2-8°C, 12 months |
Note: The reagents must be stored strictly according to the preservation conditions in the above table. The reagents in different kits cannot be mixed with each other. For a small volume of reagents, please centrifuge before use, so as not to obtain sufficient amount of reagents.
Technical Data:
Parameter:
Intra-assay Precision
Three human serum samples were assayed in replicates of 20 to determine precision within an assay (CV = Coefficient of Variation).
| Parameters | Sample 1 | Sample 2 | Sample 3 |
| Mean (U/L) | 26.00 | 154.00 | 287.00 |
| %CV | 2.3 | 2.2 | 2.1 |
Inter-assay Precision
Three human serum samples were assayed 20 times in duplicate by three operators to determine precision between assays.
| Parameters | Sample 1 | Sample 2 | Sample 3 |
| Mean (U/L) | 26.00 | 154.00 | 287.00 |
| %CV | 6.8 | 7.3 | 7.5 |
Sensitivity
The analytical sensitivity of the assay is 4 U/L. This was determined by adding two standard deviations to the mean O.D. obtained when the zero standard was assayed 20 times, and calculating the corresponding concentration.
Standard Curve:
As the OD value of the standard curve may vary according to the conditions of the actual assay performance (e.g. operator, pipetting technique or temperature effects), so the standard curve and data are provided as below for reference only:
| Concentration (μmol/L) | 0 | 0.05 | 0.1 | 0.2 | 0.4 | 0.6 | 0.8 |
| Average OD | 0.106 | 0.162 | 0.224 | 0.346 | 0.555 | 0.794 | 0.953 |
| Absoluted OD | 0.000 | 0.057 | 0.118 | 0.241 | 0.450 | 0.689 | 0.848 |