Amplite® Colorimetric Enterokinase Activity Assay Kit
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Telephone | 1-800-990-8053 |
Fax | 1-800-609-2943 |
sales@aatbio.com | |
International | See distributors |
Bulk request | Inquire |
Custom size | Inquire |
Shipping | Standard overnight for United States, inquire for international |
H-phrase | H303, H313, H333 |
Hazard symbol | XN |
Intended use | Research Use Only (RUO) |
R-phrase | R20, R21, R22 |
UNSPSC | 12171501 |
Overview | ![]() ![]() |
Platform
Absorbance microplate reader
Absorbance | 405 nm |
Recommended plate | Clear bottom |
Instrument specification(s) | Path check on |
Components
Example protocol
AT A GLANCE
Protocol summary
- Prepare test samples with diluted enterokinase standards (50 µL)
- Add equal volume of Enterokinase working solution (50 µL)
- Incubate at 37 °C for 30 - 60 minutes
- Monitor OD increase at 405 nm
Important notes
Thaw one vial of each kit component at room temperature before starting the experiment.
PREPARATION OF STOCK SOLUTION
1. EK Yellow™ stock solution (100X):
Add 50 µL of DMSO (Component E) into EK Yellow™ (Component A) to make 100X stock solution.
2. Enterokinase Substrate stock solution (100X):
Add 50 µL of DMSO (Component E) into Enterokinase Substrate (Component B) to make 100X stock solution.
3. Enterokinase standard solution (10 ug/mL):
Add 50 uL of ddH2O + 0.1% BSA into Enterokinase Standard vial (Component D) to make 10 µg/mL Enterokinase stock solution.
PREPARATION OF STANDARD SOLUTION
For convenience, use the Serial Dilution Planner: https://www.aatbio.com/tools/serial-dilution/11410
Add 10 µL of 10 µg/mL Enterokinase standard solution into 990 µL of Assay Buffer (Component C) to get 100 ng/mL enterokinase solution (EK7). Then perform 1:2 serial dilutions in assay buffer to get serially diluted enterokinase standards (EK6 - EK1). Note: The EK standards are for positive control only, and should not be relied on as a quantitation standard for enzyme activity.
PREPARATION OF WORKING SOLUTION
Add 50 µL of EK Yellow™ stock solution and 50 µL of Enterokinase Substrate stock solution into 5 mL of Assay Buffer (Component C); mix well to make Enterokinase (EK) working solution (Component A+B+C). Note: The assay mixture is enough for one 96-well plate. It is not stable, use promptly.
SAMPLE EXPERIMENTAL PROTOCOL
Table 1. Layout of enterokinase standards and test samples in a 96-well clear bottom microplate. EK = enterokinase standard (EK1 - EK7, 1.56 to 100 ng/mL); BL = blank control; TS = test sample.
BL | BL | TS | TS |
EK1 | EK1 | ... | ... |
EK2 | EK2 | ... | ... |
EK3 | EK3 | ||
EK4 | EK4 | ||
EK5 | EK5 | ||
EK6 | EK6 | ||
EK7 | EK7 |
Table 2. Reagent composition for each well.
Well | Volume | Reagent |
EK1 - EK7 | 50 µL | serial dilution (1.56 to 100 ng/mL) |
BL | 50 µL | Assay Buffer (Component C) |
TS | 50 µL | sample |
- Prepare enterokinase standards (EK), blank controls (BL), and test samples (TS) into a 96-well clear bottom microplate according to the layout provided in Table 1 and Table 2. For a 384-well plate, use 25 µL of reagent per well instead of 50 µL.
- Add 50 µL of EK working solution into each well of enterokinase standard, blank control, and test samples to make the total assay volume of 100 µL/well. For a 384-well plate, add 25 µL of EK working solution into each well instead, for a total volume of 50 µL/well.
- Incubate the reaction mixture at 37 °C for 30 - 60 minutes.
- Monitor the absorbance increase with an absorbance plate reader with path check on at OD of 405 nm.
Images
References
Authors: Melicherova K, Krahulec J, Safranek M, Liskova V, Hopkova D, Szeliova D, Turna J.
Journal: Appl Microbiol Biotechnol. (2016)
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Journal: PLoS Negl Trop Dis (2014): e2644
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Journal: Biotechnol Lett (2014): 1675
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Journal: J Biotechnol (2013): 421
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Journal: Biotechnol Lett (2013): 383
Authors: Santana SD, Pina AS, Roque AC.
Journal: J Biotechnol (2012): 378
Authors: Chun H, Joo K, Lee J, Shin HC.
Journal: Biotechnol Lett (2011): 1227
Authors: Yamashina I., undefined
Journal: Proc Jpn Acad Ser B Phys Biol Sci (2010): 578
Authors: Kubitzki T, Minor D, Mackfeld U, Oldiges M, Noll T, Lutz S.
Journal: Biotechnol J (2009): 1610
Application notes
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