93000 Immunosuppressants in Whole Blood

MassTox® Immunosuppressants in Whole Blood - LC-MS/MS

  • Cyclosporin A
  • Everolimus
  • Sirolimus
  • Tacrolimus

Order no.: 93000, 93000/1200
400 / 1200 Tests

Matrix effects are compensated by online sample preparation using the trap column technique and deuterated internal standards

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Clinical relevance

Immunosuppressants suppress the activity of the immune system in order to prevent organ transplant rejection. They are also used as therapeutic drugs for the treatment of autoimmune diseases. Therapeutic drug monitoring of immunosuppressants is indispensable for therapy following after organ transplantation. Besides mycophenolic acid, the immunosuppressants most commonly used following an organ transplantion include cyclosporin A (INN: Ciclosporin), tacrolimus (FK506), sirolimus and everolimus. Cyclosporin A and tacrolimus block the cellular signal transduction, which is required for the immune response, by inhibiting the enzyme calcineurin. For instance, it controls the synthesis of interleukin in the T cells during an immune response. In contrast, sirolimus, and its derivative everolimus, are calcineurin-independent and inhibit mTOR (mammalian target of rapamycin), an important enzyme of the intracellular signal transduction during the immune response.

The quantitative determination of these immunosuppressants should be performed only with LC-MS/MS, because the immunological tests vary considerably in terms of selectivity and specificity, and sometimes also detect inactive metabolites. The compensation of matrix effects also plays a key role in the diagnostic analysis of immunosuppressants from a complex matrix such as whole blood. It is therefore essential that interferences are reduced significantly to achieve precise and reliable quantification.


Product advantages

  • Reliable elimination of matrix effects
  • High selectivity and sensitivity
  • 6PLUS1® Multilevel Calibrator Set and MassCheck® Controls available


The sample preparation is reduced to a simple and effective protein precipitation step and ensures a major minimisation of matrix effects. After this, the analytes are concentrated online using a trap column and interfering matrix substances are separated. The trap column is connected by a simple switching system to the HPLC column and the MS/MS system. The isotopically labelled internal standards compensate very effectively for the remaining ion suppression. Therefore, the analysis of the four immunosuppressants using this kit is robust, precise and reproducible. The use of 6PLUS1® multilevel calibrators from human whole blood and our MassCheck® controls ensures highly accurate results.

For accelerated analysis and very high sample throughput, we also offer the ONEMINUTE Method for LC-MS/MS (order no. 93900).


Kit content 93000                              

Mobile Phase A, 1000 ml                     
Mobile Phase B, 1000 ml                      
Precipitation Reagent, 100 ml                 
Internal Standard Set, 1 box                
Extraction Buffer, 40 ml           
Rinsing Solution, 1000 ml          
Reaction vials, light protected, 4 x 100 pcs.        


Kit content 93000/1200

Mobile Phase A, 3 x 1000 ml                     
Mobile Phase B, 3 x 1000 ml                      
Precipitation Reagent, 3 x 100 ml                 
Internal Standard Set, 3 x 1 box              
Extraction Buffer, 3 x 40 ml        
Rinsing Solution, 2 x 1000 ml            
Reaction vials, light protected, 12 x 100 pcs.       
Analytical column, 1 pc.           
Trap column, 2 pcs.                   
6PLUS1® Multilevel  Calibrator Set Immunosuppressants, 7 x 2 ml       


Technical Data

Method of Analysis



Cyclosporin A, Everolimus, Sirolimus, Tacrolimus

Analysis Time

4.5 min

Limit of quantification

Cyclosporin A: < 5.0 µg/l
Everolimus: < 0.5 µg/l
Sirolimus: < 0.5 µg/l
Tacrolimus: < 0.5 µg/l


Cyclosporin A: up to 2000 µg/l
Everolimus: up to 100 µg/l
Sirolimus: up to 100 µg/l
Tacrolimus: up to 100 µg/l


Whole blood

Pre-analytic Treatment

Stored at +2 to +8 °C patient samples are stable up to 7 days.

Sample Preparation

  • Place 50 µl sample/calibrator/control into a 1.5 ml reaction vial.
  • Add 25 µl reconstituted Internal Standard Mix.
  • Add 100 µl Extraction Buffer mix 10 s (vortex) and incubate for 2 min at ambient temperature.
  • Add 250 µl Precipitation Reagent,  mix 1 min (vortex) and incubate for 2 min at ambient temperature.
  • Centrifuge 5 min at 15000 x g.
  • Transfer the supernatant for analysis into the LC-MS/MS systems.

Sample Stability

up to 7 days at +2°C to 8°C

Injection Volume

5–25 µl


ESI positive



Please note

The freely available information on this website, in particular on the sample preparation, are not sufficient to work with our products. Please read instructions and warning notices on products and/or instruction manuals.

Kit Components

Components available separately

Mobile Phase A

Order no.: 93001

Mobile Phase B

Order no.: 93002

Precipitation Reagent

Order no.: 93003

Extraction Buffer

Order no.: 93005

Rinsing Solution

Order no.: 93009

Internal Standard Set

Order no.: 93046

Reaction vials

Order no.: 33005


Calibrators available separately