Trypsin Activity Assay Kit
SKU: E-BC-K843-M-96
Trypsin Activity Assay Kit
| SKU # | E-BC-K843-M |
| Detection Instrument | Microplate reader (400-410 nm, optimum wavelength: 405 nm) |
|
Detection method |
Colorimetric method |
Product Details
Properties
| Sample type | Animal tissue |
| Sensitivity | 1.86 U/L |
| Detection range | 1.86-100.65 U/L |
| Detection method | Colorimetric method |
| Assay type | Enzyme Activity |
| Precision | Average inter-assay CV: 7.2-11.2% | Average intra-assay CV: 3.9-5.1% |
| Other instruments required | Incubator |
| Storage | -20℃ |
| 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 small intestine tissue homogenate | 2-5 |
| 10% Mouse large intestine tissue homogenate | 2-5 |
| 10% Rat intestine tissue homogenate | 2-5 |
| 10% Rat chyme tissue homogenate | 2-5 |
Note: The diluent is normal saline (0.9% NaCl). For the dilution of other sample types, please do pretest to confirm the dilution factor
Detection Principle
Trypsin catalyzes the substrate to form p-nitroaniline, which has a certain light absorption value at 400-410 nm wavelength. Since the absorbance of p-NA is proportional to the content, the activity of trypsin can be calculated by measuring the p-NA produced per unit time.
Kit Components & Storage
| Item | Component | Size 1(48 T) | Size 2(96 T) | Storage |
| Reagent 1 | Buffer Solution | 50 mL × 1 vial | 50 mL × 2 vials | -20℃, 12 months |
| Reagent 2 | Substrate | Power ×1 vial | Power ×2 vials | -20℃, 12 months, shading light |
| Reagent 3 | Standard | Power ×1 vial | Power ×2 vials | -20℃, 12 months, shading light |
| Reagent 4 | Diluent | 2 mL × 1 vial | 4 mL × 1 vial | -20℃, 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 rat intestine tissue 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) | 5.60 | 26.80 | 76.40 |
| %CV | 5.1 | 3.9 | 4.5 |
Inter-assay Precision
Three rat intestine tissue 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) | 5.60 | 26.80 | 76.40 |
| %CV | 11.2 | 7.2 | 9.8 |
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 106%.
| Standard 1 | Standard 2 | Standard 3 | |
| Expected Conc. (mmol/L) | 0.24 | 0.5 | 0.73 |
| Observed Conc. (mmol/L) | 0.3 | 0.5 | 0.8 |
| Recovery rate(%) | 113 | 100 | 105 |
Sensitivity
The analytical sensitivity of the assay is 1.86 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 (mmol/L) | 0 | 0.2 | 0.3 | 0.4 | 0.6 | 0.7 | 0.8 | 1.0 |
| Average OD | 0.367 | 0.423 | 0.454 | 0.484 | 0.543 | 0.571 | 0.595 | 0.659 |
| Absoluted OD | 0 | 0.056 | 0.087 | 0.117 | 0.176 | 0.204 | 0.228 | 0.292 |