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β - Galactosidase (β –GAL) Activity Assay Kit
SKU: E-BC-K631-M-96
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β - Galactosidase (β –GAL) Activity Assay Kit
| SKU # | E-BC-K631-M |
| Detection Instrument | Microplate reader (390-410 nm, optimum wavelength: 400 nm) |
| Detection method | Colorimetric method |
Product Details
Properties
| Synonyms | β-GAL |
| Sample type | Serum , plasma, cells, animal and plant tissue |
| Sensitivity | 16.19 U/L |
| Detection range | 16.19-1200 U/L |
| Detection Method | Colorimetric method |
| Assay type | Enzyme Activity |
| Assay time | 70 min |
| Precision | Average inter-assay CV: 6% | Average intra-assay CV: 3% |
| Other instruments required | Water bath, Incubator, Centrifuge, Microplate reader |
| Other reagents required | 2 mmol/L hydrochloric acid |
| Storage | Reagent 2: -20℃; Others: 2-8℃ |
| Valid period | 12 months |
Dilution of Sample
The recommended dilution factor for different samples is as follows (for reference only):
| Sample type | Dilution factor |
| 10% Mouse liver tissue homogenate | 1 |
| 10% Rat brain tissue homogenate | 1 |
| 10% Rat kidney tissue homogenate | 3-5 |
| 10% Rat liver tissue homogenate | 1-3 |
| 10% Rat heart tissue homogenate | 1 |
| Human serum | 1 |
Note: The diluent is buffer solution. For the dilution of other sample types, please do pretest to confirm the dilution factor.
Detection Principle
β-galactosidase can catalyze the substrate nitrophenylgalactoside pyranopyranoside to produce nitrophenol, which has a maximum absorption peak at 400 nm. The activity of β-GAL can be calculated by measuring the OD value at 400 nm.
Kit Components & Storage
| Item | Component | Size (96 T) | Storage |
| Reagent 1 | Buffer Solution | 25 mL ×1 vial | 2-8℃, 12 months, shading light |
| Reagent 2 | Substrate | Powder × 1 vial | -20℃, 12 months |
| Reagent 3 | Activator Agent | 1.5 mL × 1 vial | 2-8℃, 12 months shading light |
| Reagent 4 | Chromogenic Agent | 25 mL×1 vial | 2-8℃, 12 months |
| Reagent 5 | 20 mmol/L Standard Solution | 1 mL × 1 vial | 2-8℃, 12 months |
| Microplate | 96 wells | No requirement | |
| Plate Sealer | 2 pieces |
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) | 25.60 | 435.00 | 653.00 |
| %CV | 3.2 | 3.0 | 2.8 |
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) | 25.60 | 435.00 | 653.00 |
| %CV | 5.6 | 6.3 | 6.1 |
Recovery
Take three samples of high concentration, middle concentration and low concentration to test the samples of each concentration for 6 times parallelly to get the average recovery rate of 101%.
| Standard 1 | Standard 2 | Standard 3 | |
| Expected Conc. (mmol/L) | 0.15 | 0.46 | 0.77 |
| Observed Conc. (mmol/L) | 0.2 | 0.5 | 0.8 |
| Recovery rate (%) | 101 | 99 | 103 |
Sensitivity
The analytical sensitivity of the assay is 16.19 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 | 0.1 | 0.2 | 0.4 | 0.5 | 0.6 | 0.7 | 0.8 |
| Average OD | 0.040 | 0.112 | 0.192 | 0.328 | 0.403 | 0.490 | 0.565 | 0.640 |
| Absoluted OD | 0.000 | 0.072 | 0.152 | 0.288 | 0.363 | 0.450 | 0.525 | 0.600 |