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Content/ VialPreparationStorage and Stability
Standards,
Vials 9 to 14\t\t\t\t\t\t
Add 500 μl of water to each of the vials and mix thoroughly for 30 minutes
to completely dissolve the lyophilizate.
At +2 to +8°C for 4 weeks.


 
Controls,
Vials 15, 16
Add 500 μl of water to each of the vials and mix thoroughly for 30 minutes
to completely dissolve the lyophilizate.
At +2 to +8°C for 4 weeks.


 
Wash Buffer
Vial 5
Dilute the entire contents of the bottle (100 ml) with 900 ml water
and mix thoroughly.
 
At +2 to +8°C for 4 weeks.
Biotin
Conjugate,
Vial 3
Dilute the appropriate volume 1:10 with Incubation Buffer from Vial 1.
 
At +2 to +8°C for 4 weeks.


 
DIG
Conjugate,
Vial 4
Dilute the appropriate volume 1:10 with Incubation Buffer from Vial 1.
 
At +2 to +8°C for 4 weeks.


 
Anti-DIG
POD
Reagent,
Vial 6
1. Add 500 μl water to the vial and mix thoroughly for 30 min to completely
dissolve the lyophilizate. The concentration of the reconstituted solution is 4 U/ml.
2. Dilute the 4 U/ml solution with Conjugate Buffer (Vial 2) in 2 steps to
achieve a working concentration of 15 mU/ml, as follows:
  • Step A: 50 μl POD (4 U/ml) + 450 μl Conjugate Buffer
  • Step B: 375 μl product from Step A + 9.625 ml Conjugate Buffer
At +2 to +8°C for 4 weeks.
Biotin DIG
Working
Solution
Combine equal volumes of the prepared working solutions: Biotin Conjugate and DIG Conjugate (from Steps 4 and 5 above).
Mix thoroughly, for example, using a roller mixer for 10 minutes
Use within 30 minutes after preparation.
", "Name": "Storage Conditions (Working Solution)" }, { "Language": "en", "Value": "≤ 0.5 ng/ml", "Name": "Sensitivity" }, { "Language": "en", "Value": "Intra-assay precision: ≤10% (typically ≤ 5%)
Inter-assay precision: ≤15% (typically ≤10%)", "Name": "Precision" }, { "Language": "en", "Value": "0.5 ng/ml up to approximately 50 ng/ml.", "Name": "Detection range" }, { "Language": "en", "Value": "Unit of measure is \"piece\".", "Name": "CB - Order Information" }, { "Language": "en", "Value": "
  • Polypropylene tubes for preparation of antibody reagents
  • 1 liter bottle for wash buffer preparation
  •  Micropipettes
  • Centrifuge
  • Multi-well plate shaker
  • Roller mixer
  • ELISA reader
  • Multi-well plate washer
", "Name": "Additional Equipment and Reagent Required" }, { "Language": "en", "Value": "A quantitative, functional assay is performed to assess background signal, and the lot-specific concentrations of Standards A to F and Controls X and Y.", "Name": "Quality Control" }, { "Language": "en", "Value": "
Preparation of Sample Material
Culture supernatant
First test a sample of fresh, unused media for a potential background absorbance as some media may contain residual trypsin from production procedures.
When testing fresh, unused media, ensure that all supplements required for the culture conditions have been added to the media.
Cell-free aqueous solution
No sample preparation is required.
Cell culture material
The samples must be centrifuged and the supernatants can be used for trypsin determination.
If there are samples with an expected trypsin concentration of approximately > 50 ng/ml, or the photometric absorbance of a sample measurement is higher than the measured absorbance of the highest Standard F, then dilute the sample (e.g., 1:20 and 1:100) with Incubation Buffer from Bottle 1 and test the diluted sample.
ELISA Procedure
The ELISA was developed and evaluated using 10 μl sample and 90 μl immunoreagent per well of the Multi-well Plate. Use the recommended volumes.
Perform measurements of at least duplicates of each sample, standards, and controls.
Include the standards provided with the kit on the same plate in each run to generate quantitative results. For quality control of the correct function of all components of the assay, measure the positive controls provided with the kit (Controls X and Y; Bottles 15 and 16) together with the samples on the same plate in each run and include a negative control.
Working temperature for all of the procedures described below is +15 to +25°.
  1. Transfer 10 μl per well of the following materials in duplicate to 2 wells each on the coated Multi-well Plate:
    - Standards A to F (Bottles 9 to 14)
    - Positive Controls X and Y (Bottles 15 and 16)
    - Negative control of your sample matrix (cell culture medium or aqueous buffer solution)
    - Samples (centrifuged cell culture supernatants or aqueous solutions from your biotechnological process step)
  2. Add 90 μl of the fresh Biotin DIG Working Solution to each well.
  3. Seal the Multi-well Plate with an MWP-sealing film.
  4. Incubate the sealed plate on a multi-well plate shaker at 300 rpm and +15 to +25°C for 1 hour.
  5. Remove the film carefully and wash the Multi-well Plate 3 times with 300 μl per well of the diluted 1x Wash Buffer using a multi-well plate washer.
  6. Pipette 100 μl of the diluted working solution of the Anti-Dig POD Reagent (15 mU/ml) into each well.
  7. Seal the Multi-well Plate with an MWP-sealing film.
  8. Incubate the sealed plate on a multi-well plate shaker at 300 rpm and +15 to +25°C for 30 minutes.
  9. Remove the film carefully and wash the Multi-well Plate 3 times with 300 μl per well of the diluted 1x Wash Buffer using a multi-well plate washer.
  10. Pipette 100 μl Detection Substrate (TMB) (Bottle 7) into each well.
  11. Seal the Multi-well Plate with an MWP-sealing film.
  12. Incubate the sealed plate on a multi-well plate shaker at 300 rpm and +15 to +25°C for 15 minutes.
  13. Remove the film carefully and pipet 50 μl of Stop Solution (Bottle 8) into each well.
  14. Seal the Multi-well Plate with an MWP-sealing film.
  15. Incubate the sealed plate on a multi-well plate shaker with 300 rpm for 1 minute at +15 to +25°C.
  16. Place the plate in a multi-well plate reader and measure at 450 nm, reference wavelength 620 nm.
Calculation of Concentrations
  1. Calculate the mean of the absorbance values from the replicate measurements. The mean values are used for the calculations in the following steps.
  2. If the background absorbance value of the negative control is higher than the absorbance value of Standard A, the absorbance values of the samples must be corrected.
    - Subtract the absorbance value of Standard A from the absorbance value of the negative control.
    - Subsequently, subtract the corrected negative control absorbance value from the absorbance values of the samples.
    - Use the obtained absorbance values to calculate the trypsin concentrations of the samples.
  3. Generate a calibration curve using the concentrations and absorbances of Standards A to F. Use the information from the lot-specific standard concentrations in the value table in section Lot-specific Data. Use a curve fitting software with a 4 parameter non-linear fit model to calculate the standard curve using the results of Standards A to F.
  4. Use the absorbance values of the controls, as well as the corrected absorbance values of the samples from Step 2 to determine the concentrations based on the standard curve created in Step 3.
Checks and Controls
Quality control of the test run
Check the recovery of the controls. The determined control concentrations should be within ± 25% of the lot-specific target concentration (see section Lot-Specific Data for the concentrations of Controls X and Y). If the results of the control concentrations are not within ± 25% of the lot-specific target concentration, the sample results may be invalid.
Concentration out of range
If the mean absorbance of a sample is higher than the absorbance of the highest Standard F, then the sample concentration is higher than the concentration of Standard F. An exact concentration value for a sample cannot be calculated when the sample has an absorbance value that is higher than the absorbance of the Standard F. To determine the concentration of such a sample, repeat the test with a diluted sample. Dilute the sample with Incubation Buffer (Bottle 1) at, for example, 1:20 and 1:100. Take the dilution factor into consideration when calculating the concentration with the absorbance values of the diluted sample.", "Name": "Protocols" }, { "Language": "en", "Value": "
  • Incubation time: 1 hour 45 minutes.
  • Total assay time: approximately 2 to 2.5 hours
", "Name": "Assay Time" }, { "Language": "en", "Value": "
Vial / BottleCapLabelFunction/DescriptionContent
1whiteResidual Protein Trypsin Kit, Incubation Buffer
  • Ready-to-use solution
  • For preparation of the Biotin DIG working Solution
1 bottle,
100 ml
2blueResidual Protein Trypsin Kit, Conjugate Buffer
  • Ready-to-use solution
  • For preparation of the Anti-DIG POD Reagent, Vial 6
1 bottle,
100 ml
3yellowResidual Protein Trypsin Kit, Biotin
Conjugate
  • Biotin labeled for target capture
  • Polyclonal anti-trypsin sheep antibody against recombinant trypsin
  • 20-fold stock solution
1 vial,
0.75 ml
4purpleResidual Protein Trypsin Kit, DIG conjugate
  • Digoxigenin labeled for target marking
  • Polyclonal anti-trypsin sheep antibody against recombinant  trypsin
  • 20-fold stock solution
1 vial,
0.75 ml
 
5redResidual Protein Trypsin Kit, Wash Buffer
  • For washing steps
  • 10-fold stock solution
1 bottle,
100 ml
6redResidual Protein Trypsin Kit, Anti-DIG POD
Reagent
  • Peroxidase conjugated to anti-DIG antibody
  • Lyophilizate
1 bottle
7blackResidual Protein Trypsin Kit, Detection Substrate (TMB)
  • For color development nd detection
  • Ready-to-use solution
1 bottle,
15 ml
8colorlessResidual Protein Trypsin Kit, Stop Solution
  • For stopping the color development
  • Ready-to-use solution
1 bottle,
15 ml
9sandResidual Protein Trypsin Kit, Standard A
  • For calibration of the assay
  • Lyophilizate
  • Trypsin free
1 bottle
10beigeResidual Protein Trypsin Kit, Standard B
  • For calibration of the assay
  • Recombinant trypsin
  • Lyophilizate
1 bottle
11mustardResidual Protein Trypsin Kit, Standard C
  • For calibration of the assay
  • Recombinant trypsin
  • Lyophilizate
1 bottle
12oliveResidual Protein Trypsin Kit, Standard D
  • For calibration of the assay
  • Recombinant trypsin
  • Lyophilizate
1 bottle
13caramelResidual Protein Trypsin Kit, Standard E
  • For calibration of the assay
  • Recombinant trypsin
  • Lyophilizate
1 bottle
14rosewoodResidual Protein Trypsin Kit, Standard F
  • For calibration of the assay
  • Recombinant trypsin
  • Lyophilizate
1 bottle
15whiteResidual Protein Trypsin Kit, Control X
  • Positive control
  • Recombinant trypsin
  • Lyophilizate
1 bottle
 
16greenResidual Protein Trypsin Kit, Control Y
  • Positive control
  • Recombinant trypsin
  • Lyophilizate
1 bottle
 
17-Residual Protein Trypsin Kit, Coated Micro Titer Plate
  • Target capture
  • Streptavidin- coated multi-well plate
  • Ready-to-use
12 strips in frame
18-Residual Protein Trypsin Kit, Multi-well Sealing
Film
  • Sealing MWP during
  • incubations
10 pieces of self-adhesive film
", "Name": "Content" }, { "Language": "en", "Value": "\n\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\n\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\n
ObservationPossible causeRecommendation
Absorbance of samples too low                        Insufficient TMB reactionIncrease the incubation time with the Detection Substrate (TMB) for color development (Step 12). The incubation time can be increased until the wells with the higher concentrated standards show a clearly observable blue color, up to 40 minutes.
POD conjugate has a reduced enzymatic activity.Use freshly prepared POD conjugate.
Low concentration after dilution of highly concentrated samples                                               Reduce dilution factor for highly concentrated samples.
Absorbance of
\n\t\t\tsamples too high
Concentration exceeds measuring range.Dilute samples to ensure that they are within the specified detection range.
Background of sample matrix.Check analyte-free sample matrix for background absorbance value. Correct sample values for background absorbance of matrix.
Contamination of samples with trypsin from lab workspace.Check absorbance values of Standard A and negative control. If the absorbance values of Standard A and the negative control are significantly increased, repeat the experiment in a different workspace using a new kit. Be careful when reconstituting lyophilizates. Thoroughly clean contaminated workspace.
Absorbance of
\n\t\t\tnegative control
\n\t\t\ttoo high
Background of sample matrix.Check for potential residual trypsin in the analyte-free matrix using a different lot of the matrix.
Contamination of samples with
\n\t\t\ttrypsin from lab workspace.
Check absorbance values of Standard A and negative control. If the absorbance values of Standard A and the negative control are significantly increased, repeat the experiment in a different workspace using a new kit. Be careful when reconstituting lyophilizates. Thoroughly clean contaminated workspace.
Absorbance of the background too highSubstrate shows color development without enzymatic activity.Use a newly opened vial of Detection Substrate (TMB).
Contamination of samples with
\n\t\t\ttrypsin from lab workspace.
Check absorbance values of Standard A and negative control. If the absorbance values of Standard A and the negative control are significantly increased, repeat the experiment in a different workspace using a new kit. Be careful when reconstituting lyophilizates. Thoroughly clean contaminated workspace.
Variations too
\n\t\t\thigh
Insufficient mixing of sample and incubation mix.Ensure mixing on the multi-well plate mixer is done with 300 rpm.
Residual buffer after washingCheck performance of multi-well plate washer. Wells should not contain residual buffer after washing. Try tapping the Multi-well Plate on an absorbent paper towel to remove traces of Wash Buffer.
Sample matrix difficult to pipette due to viscosity or composition.Carefully pipette samples without droplets on outside of tip. Avoid high aspiration or ejection velocity when pipetting the samples.
Precision of micropipettesCheck the precision of the micropipettes.
Multi-well plate washer not washing correctly.Check the multi-well plate washer for tip blockage or salt crystallization, which may affect the evenness and effectiveness of the washing steps.
", "Name": "Troubleshooting" }, { "Language": "en", "Value": "
  • Aqueous buffer solutions from biotechnology processes.
  • Cell culture supernatant
", "Name": "Sample Materials" }, { "Language": "en", "Value": "
Always ensure that positive and negative controls are tested on each plate together with samples.
Positive controls
Control X and Y are positive controls and are provided with the kit. For preparation of the positive controls, see section Preparation of Working Solutions.
Negative control
Analyte-free matrix of your sample material, such as buffer or cell culture medium.", "Name": "Control Reactions" }, { "Language": "en", "Value": "
Use double-distilled or deionized water of equivalent quality, for reconstitution of the lyophilizates. Ensure that the lyophilizates are carefully reconstituted to avoid trypsin contamination of the environment. Trypsin contamination of the workspace may potentially contaminate samples to be tested.
A roller mixer may be used to effectively dissolve lyophilizates
In addition to the ready-to-use solutions supplied with this kit, you will need to prepare the following working solutions:

SolutionContentReconstitution/Preparation of Working SolutionStorage and StabilityFor use in...
9 to 14Standards A to F (Bottles 9 to 14)Add 500 μl of double-distilled water to each of the vials and mix thoroughly for 30 minutes to completely dissolve the lyophilizate.Store 4 weeks at +2 to +8°CCalibration of the assay
15 and 16Controls X and Y (Bottles 15 and 16)
  • Add 500 μl of double-distilled water to each of the vials and mix thoroughly for 30 minutes to completely dissolve the lyophilizate.
  • The controls supplied with the kit are ready to use once reconstituted.
Do not further dilute the Positive Controls X and Y.
Store 4 weeks at +2 to +8°CPositive controls
5Wash Buffer (Bottle 5)Dilute the entire contents of the bottle (100 ml) with 900 ml water and mix thoroughly.Store 4 weeks at +2 to +8°CWashing steps
3Biotin Conjugate (Vial 3)
  • Dilute the appropriate volume 1:10 with Incubation Buffer from Bottle 1.
  • For a 96-well plate, prepare 500 μl of Biotin Conjugate stock solution + 4.5 ml of Incubation Buffer.
  • If using only a part of the 96 wells, then prepare a proportionally reduced volume of this working solution.
Store 4 weeks at +2 to +8°CPreparation of Biotin DIG Working Solution
Target capture
4DIG Conjugate (Vial 4)
  • Dilute the appropriate volume 1:10 with Incubation Buffer from Bottle 1.
  • For a 96-well plate, prepare 500 μl of DIG Conjugate stock solution + 4.5 ml of Incubation Buffer.
  • If using only a part of the 96 wells, then prepare a proportionally reduced volume of this working solution.
Store 4 weeks at +2 to +8°CPreparation of Biotin DIG Working Solution
Target marking
6Anti-DIG POD Reagent (Bottle 6)
  1. Add 500 μl double-distilled water to the vial and mix thoroughly for 30 minutes to completely dissolve the lyophilizate. The concentration of the reconstituted solution is 4 U/ml.
  2. Dilute the 4 U/ml solution with Conjugate Buffer (Bottle 2) in 2 steps to achieve a working concentration of 15 mU/ml, as follows:
  • Step A: 50 μl Anti-DIG POD Solution (4 U/ml) + 450 μl Conjugate Buffer,
  • Step B: 375 μl product from Step A + 9.625 ml Conjugate Buffer\t   
Store 4 weeks at +2 to +8°CDetection
-Biotin DIG Working SolutionCombine equal volumes of the prepared working solutions: Biotin Conjugate (Solution 3) and DIG Conjugate (Solution 4).
Mix thoroughly, for example, using a roller mixer for 10 minutes.
Always prepare the Biotin DIG Working Solution just before use, and use the solution within 30 minutes after preparation.
Use within 30 minutes after preparation.ELISA Step 6
", "Name": "Working Solution" }, { "Language": "en", "Value": "The Roche Residual Protein Trypsin Kit, based on an immuno assay with tailor-made polyclonal anti-trypsin antibodies for high sensitivity, makes testing for residual trypsin in bio-manufacturing down-stream processing fast and reliable. The assay is perfectly suited for process development, in-process control and final quality control.", "Name": "Product Description" }, { "Language": "en", "Value": "This kit is intended for use with the following types of sample material:
  • Aqueous buffer solutions from biotechnology processes.
  • Cell culture supernatant
     
Positive controls: Control X and Y are positive controls and are provided with the kit.", "Name": "Applications" }, { "Language": "en", "Value": "
  • Fast: Total assay time of 2-2.5 h
  • High sensitivity: Detection limit ≤ 0.5 ng/mL, measuring range 0.5 - 50 ng/mL
  • High specificity: Specific detection of trypsin and fragments thereof by use of polyclonal antibodies against the recombinant trypsin from Roche
", "Name": "Benefits" }, { "Language": "en", "Value": "Immunologic assay for sensitive detection of trypsin.", "Name": "Positioning" }, { "Language": "en", "Value": "Performance test: Corresponds to specification
Stability: At +2 to +8°C within specification range for 12 months.
", "Name": "Specification" } ] } } ] }

Residual Protein Trypsin Kit

Kit for determination of trypsin

Residual Protein Trypsin Kit