K-ASSAY 

KAMIYA BIOMEDICAL COMPANY

KAMIYA BIOMEDICAL COMPANY

Rat Plasminogen ELISA
For the quantitative determination of plasminogenin rat biological samples

Cat. No. KT-461

For Research Use Only.

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KAMIYA BIOMEDICAL COMPANY

Product Information
Rat Plasminogen ELISA
Cat. No. KT-461
INTENDED USE
The Rat Plasminogen ELISA is a highly sensitive two-site enzyme-linked immunoassay (ELISA) for the quantitative
determination of Plasminogen in rat biological samples. For research use only.

INTRODUCTION
Plasminogen (PMG) is a glycoprotein produced by the liver. It is the precursor for plasmin, which targets fibrin in theprocess of dissolution of fibrin blood clots. Plasminogen is present in plasma and most extravascular fluids. The importantrole of plasminogen in the fibrinolytic system makes it an interesting marker for various diseases.

PRINCIPLE
The principle of the double antibody sandwich ELISA is represented in Figure 1. In this assay the Plasminogen present in
the sample reacts with the anti-Plasminogen antibodies which have been adsorbed to the surface of polystyrene microtiterwells. After the removal of unbound sample proteins by washing, anti-Plasminogen antibodies conjugated withhorseradish peroxidase (HRP), are added. These enzyme-labeled antibodies form complexes with the previously bound
Plasminogen. Following another washing step, the enzyme bound to the immunosorbent is assayed by the addition of achromogenic substrate, 3,3’,5,5’-tetramethylbenzidine (TMB). The quantity of bound enzyme varies directly with theconcentration of Plasminogen in the sample tested; thus, the absorbance, at 450 nm, is a measure of the concentration ofPlasminogen in the test sample. The quantity of Plasminogen in the test sample can be interpolated from the calibration
curve constructed from the calibrators, and corrected for sample dilution.

Figure 1.
Anti-Plasminogen Antibodies Bound To Solid Phase│
Calibrators and Samples Added│
Plasminogen * Anti-Plasminogen Complexes Formed│
Unbound Sample Proteins Removed│
Anti-Plasminogen-HRP Conjugate Added│
Anti-Plasminogen-HRP * Plasminogen * Anti-Plasminogen
Complexes Formed│
Unbound Anti-Plasminogen-HRP Removed│
TMB Substrate Added│
Determine Bound Enzyme ActivityCOMPONENTS
1. Diluent Concentrate
One bottle containing 50 mL of a 5X concentrated diluent running buffer.

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2. Wash Solution Concentrate
One bottle containing 50 mL of a 20X concentrated wash solution.
3. Enzyme-Antibody Conjugate Concentrate
One vial containing 150 µL of a 100X concentrated affinity-purified anti-rat Plasminogen antibody conjugated with HRP
in a stabilizing buffer.
4. TMB Substrate Solution
One vial containing 12 mL of TMB and hydrogen peroxide in citric acid buffer at pH 3.3.
5. Stop SolutionOne vial containing 12 mL of 0.3 M sulfuric acid. WARNING: Avoid contact with skin.
6. Microtiter Plate
Twelve removable eight-well strips in well holder frame. Wells are coated with affinity-purified anti-rat Plasminogen.
7. Rat Plasminogen Calibrator
One vial containing a lyophilized Rat Plasminogen Calibrator.

MATERIALS REQUIRED BUT NOT PROVIDED
••
•
•••
•
•

Test tubes
Precision pipette (2 µL to 200 µL) for making and dispensing dilutions.
Microplate washer/aspirator
Distilled or de-ionized H2O
Microplate reader
Assorted glassware for the preparation of reagents and buffer solutions
Timer
Vortex mixer

PRECAUTIONS
1. Read the instructions carefully before beginning the assay.
2. This kit is for research use only.
3. Great care has been taken to ensure the quality and reliability of this product. However, it is possible that in certain
cases, unusual results may be obtained due to high levels of interfering factors.
4. No additives or preservatives are necessary to maintain the integrity of the specimen. Avoid azide contamination.
5. Azide and thimerosal at concentrations higher than 0.1% inhibit the enzyme reaction.
6. Other precautions: Do not interchange kit components from different lots.
 Do not use kit components beyond the expiration date.
 Protect reagents from direct sunlight.
 Do not pipette by mouth.
 Do not eat, drink, smoke or apply cosmetics where reagents are used.
 Avoid all contact with the reagents by using gloves.
 Stop solution contains diluted sulfuric acid. Irritation to eyes and skin is possible. Flush with water aftercontact.

REAGENT PREPARATION
1. Diluent Concentrate
The Diluent solution supplied is a 5X concentrate and must be diluted 1:5 with distilled or de-ionized water.
2. Wash Solution Concentrate
The Wash Solution supplied is a 20X concentrate and must be diluted 1:20 with distilled or de-ionized water. Crystal
formation in the concentrate is not uncommon when storage temperatures are low. Warming of the concentrate to30-35°C before dilution can dissolve crystals.
3. Enzyme-Antibody Conjugate Concentrate
Calculate the required amount of working conjugate solution for each microtiter plate test strip by adding 10 µL
Enzyme-Antibody Conjugate to 990 µL of 1X Diluent for each test strip to be used for testing. Mix uniformly, but gently.
Avoid foaming.
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4. TMB Substrate Solution
Ready to use as supplied.
5. Stop Solution
Ready to use as supplied.
6. Microtiter Plate
Ready to use as supplied. Unseal Microtiter Pouch and remove plate from pouch. Remove all strips and wells that will
not be used in the assay and place back in pouch and re-seal along with desiccant.
7. Rat Plasminogen Calibrator
Add 1.0 mL of distilled or de-ionized water to the lyophilized Rat Plasminogen Calibrator and mix gently until dissolved.
The calibrator is now at a concentration of 0.52 µg/mL (the reconstituted calibrator should be aliquoted and frozen if
future use is intended). Rat Plasminogen calibrators need to be prepared immediately prior to use (see the followingchart). Mix well between each step. Avoid foaming.
Calibrator

Concentration(ng/mL)

7200

65
4
3
2
10100
5025
12.5
6.25
3.125
0Calibrator Volume added
to 1X Diluent
200 µL of Rat
Plasminogen
Calibrator250 µL Calibrator 7250 µL Calibrator 6250 µL Calibrator 5250 µL Calibrator 4250 µL Calibrator 3250 µL Calibrator 2

Volume of 1X Diluent

320 µL250 µL250 µL250 µL250 µL250 µL250 µL500 µLSTORAGE AND STABILITY
1. Complete Kit
The expiration date for the kit is stated on the outer label. The recommended storage temperature is 4°C. Note: Seelong term storage recommendations below for the Rat Plasminogen Calibrator.
2. Diluent
The 5X Diluent Concentrate is stable until the expiration date. The 1X working solution is stable for at least one weekfrom the date of preparation. Both solutions should be stored at 4°C.
3. Wash Solution
The 20X Wash Solution Concentrate is stable until the expiration date. The 1X working solution is stable for at least
one week from the date of preparation. Both solutions can be stored at room temperature (RT, 16-25°C) or at 4°C.
4. Enzyme-Antibody Conjugate
Undiluted horseradish peroxidase anti-Plasminogen conjugate should be stored at 4°C and diluted immediately prior touse. The working conjugate solution is stable for up to eight hours.
5. TMB Substrate Solution
The TMB Substrate Solution should be stored at 4°C and is stable until the expiration date.
6. Stop Solution
The Stop Solution should be stored at 4°C and is stable until the expiration date.
7. Microtiter Plate
Anti-rat Plasminogen coated wells are stable until the expiration date and should be stored at 4°C in the sealed foil
pouch with a desiccant pack.
8. Rat Plasminogen Calibrator
The lyophilized Rat Plasminogen Calibrator should be stored at 4°C or frozen until reconstituted. The reconstituted
calibrator should be aliquoted and stored frozen (avoid multiple freeze-thaw cycles). The working calibrator solutions
should be prepared immediately prior to use and are stable for up to eight hours.

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INDICATIONS OF INSTABILITY
If the test is performing correctly, the results observed with the calibrator solutions should be within 20% of the expectedvalues.

SPECIMEN COLLECTION AND HANDLING
Blood should be collected by venipuncture and the serum separated from the cells, after clot formation, by centrifugation.
For plasma samples, blood should be collected into a container with an anticoagulant and then centrifuged. Care should
be taken to minimize hemolysis, excessive hemolysis can impact your results. Assay immediately or aliquot and store
samples at -20°C. Avoid repeated freezing/thawing.
For any sample that might contain pathogens, care must be taken to prevent contact with open wounds. No additives orpreservatives are necessary to maintain the integrity of the specimen. Avoid azide contamination.

ASSAY PROTOCOL
Dilution of Samples
Due to the high-sensitive nature of the assay, each test sample should be diluted before use for a normal assay. A
1:4,000 dilution is appropriate for most serum/plasma samples. For absolute quantification of samples that yield results
outside the range of the calibration curve, a lesser or greater dilution might be required. If unsure of sample level, a serial
dilution with one or two representative samples before running the entire plate is highly recommended.
To prepare a 1:4,000 dilution of sample, transfer 5 µL of sample to 495 µL of 1X Diluent. This gives you a 1:100 dilution.
Next, dilute the 1:100 sample by transferring 10 µL to 390 µL of 1X Diluent. You now have a 1:4,000 dilution of yoursample. Mix thoroughly at each stage.

Procedure
1. Bring all reagents to RT before use.
2. Pipette 100 µL of
Calibrator 0 (0.0 ng/mL) in duplicate
Calibrator 1 (3.125 ng/mL) in duplicate
Calibrator 2 (6.25 ng/mL) in duplicate
Calibrator 3 (12.5 ng/mL) in duplicate
Calibrator 4 (25 ng/mL) in duplicate
Calibrator 5 (50 ng/mL) in duplicate
Calibrator 6 (100 ng/mL) in duplicate
Calibrator 7 (200 ng/mL) in duplicate
3. Pipette 100 µL of diluted sample (in duplicate) into pre designated wells.
4. Incubate the Microtiter Plate at 22°C (RT) for sixty (60 ± 2) minutes. Keep plate covered and level during incubation.
5. Following incubation, aspirate the contents of the wells.
6. Completely fill each well with appropriately diluted Wash Solution and aspirate. Repeat three times, for a total of fourwashes. If washing manually: completely fill wells with wash buffer, invert the plate then pour/shake out the contents ina waste container. Follow this by sharply striking the wells on absorbent paper to remove residual buffer. Repeat threetimes for a total of four washes.
7. Pipette 100 µL of appropriately diluted Enzyme-Antibody Conjugate to each well. Incubate at 22°C (RT) for twenty (20± 2) minutes. Keep plate covered in the dark and level during incubation.
8. Wash and blot the wells as described in Steps 5 and 6.
9. Pipette 100 µL of TMB Substrate Solution into each well.
10. Incubate in the dark at RT for precisely ten (10) minutes.

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11. After ten (10) minutes, add 100 µL of Stop Solution to each well.
12. Determine the absorbance at 450 nm of the contents of each well. Zero the plate reader to air.
The absorbance of the final reaction mixture can be measured up to two hours after the addition of the Stop Solution.
However, good laboratory practice dictates that the measurement be made as soon as possible.

RESULTS
1. Subtract the average background value from the test values for each sample.
2. Using the results observed for the calibrators construct a calibration curve. The appropriate curve fit is that of a fourparameter logistics curve. A second order polynomial (quadratic) or other curve fits may also be used.
3. Interpolate test sample values from the calibration curve. Correct for sample dilution factor to arrive at Plasminogenconcentration in original sample.

QUALITY CONTROLIn accord with good laboratory practice, the assays for specific Plasminogen require meticulous quality control. Eachlaboratory should use routine quality control procedures to establish inter- and intra-assay precision and performance
characteristics.

LIMITATION OF THE PROCEDURE
1. Reliable and reproducible results will be obtained when the assay procedure is carried out with a complete
understanding of the information contained in the package insert instructions and with adherence to good laboratory
practice.
2. Factors that might affect the performance of the assay include proper instrument function, cleanliness of glassware,
quality of distilled or de-ionized water, washing thoroughly and accuracy of reagent and sample pipetting, washingtechnique, incubation time or temperature.

FOR RESEARCH USE ONLY

KAMIYA BIOMEDICAL COMPANY
12779 Gateway Drive, Seattle, WA 98168
Tel: (206) 575-8068 Fax: (206) 575-8094
Email: LifeScience@k-assay.com
www.k-assay.com

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