2. Materials and methods
2.1. Material
2.2. Analysis of intact molecule by mass spectrometry
For MS analysis of intact Racotumomab, one lot Racotumomab-
ST10L and three different lots of Racotumomab-ST41L were taken
and desalted by extraction using solid phase Cleanup C18 Pipette
Tips as recommended by the manufacturer. The desalted samples
were mixed 1:1 with sinapic acid solution at 10 mg/mL and 1.5 L
were applied on a MALDI plate and allowed to dry at room temperature.
The mass spectrometer was operated in the linear mode, at
the range of m/z 1000–200,000, the laser power was 85, for the
calibration of the mass range of spectrometer in the experiment,
ProteoMass Calibration Standards Kit (Sigma, cat. No-1KT MSCAL2)
is acquired for 100 profiles per sample and each profile was the
average of 10 laser shots.
2.3.