• Application Note

Ostro Sample Preparation Products: Crosstalk

Ostro Sample Preparation Products: Crosstalk

  • Waters Corporation

This is an Application Brief and does not contain a detailed Experimental section.


This application brief highlights ostro sample preparation products.


One measure of a microplate’s performance is the amount of crosstalk, or cross-contamination, that occurs between adjacent wells. The influence of adjacent samples upon each other may cause errors in analyte quantitation which may effect the evaluation of a plate’s performance. This potential influence on the final results should be evaluated and taken into account if necessary. As part of the evaluation of the Ostro plate, specific experiments were conducted in order to ensure that detrimental crosstalk effects were not observed.



  • Fortified plasma – labeled “o”: ketoprofen
    • 20 mg/mL: final concentration
  • Blank plasma – labeled “x”
  • Standard sample solution: 1 μg/mL
    • 1 μg/mL: 0.005% of fortified plasma concentration
  • Sample positions:
96-Well Plate Diagram


  • Load 200 μL fortified plasma into “o” wells.
  • Load 200 μL blank plasma into “x” wells.
  • Vigorously add 600 μL 1% FA in ACN to all the wells.
  • Aspirate samples 3X using an autopipette set to 600 μL.
  • Using a 2 mL sample collection plate, apply 15-20” Hg vacuum for 5 minutes.
  • Evaporate the whole plate under 50 °C with N2 flow until all the wells are dry.
  • Reconstitute all “x” wells with 200 μL 80% (v/v) MeOH.
  • Cover plate with cap mat.
  • Inject and analyze all “x” well samples and compare to standard at 1 μg/mL. The levels in the “x” wells should be <1 μg/mL (<0.005% of the fortified plasma).
  • Detection wavelength: PDA at 250-260 nm.

Results and Discussion

Crosstalk Ketoprofen Area Count Results


Based on these data, there is no significant cross-talk observed when using the Ostro plate.

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720003676, September 2010

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