Study on the quality of recombinant proteins using matrix-assisted laser desorption ionization time of flight mass spectrometry

Figure 1 MALDI-TOF mass spectrum of interferon α2b using sinapinic acid as matrix.

Figure 2 MALDI-TOF mass spectrum of recombinant human erythropoietin using sinapinic acid as matrix.

Figure 3 MALDI-TOF mass spectrum of mixtures containing calmodulin using sinapinic acid as matrix.

Figure 4 MALDI-T OF mass spectrum of calmodulin fragment using sinapinic acid as matrix.

Figure 5 MALDI-TOF mass spectrum of standard protein mixtures using sinapinic acid as matrix. M: Myoglobin; C: Carbonic anhydrase B ; L: β-lactoglobulin; B: Bovine serum albumin.

Figure 6 MALDI-TOF mass spectrum of tryptic digests of recombinant human erythropoietin using 100 mM DHB as matrix.

Figure 7 MALDI-TOF mass spectrum of tryptic digests of recombinant human erythropoietin using 2-Aminobenzoic acid as matrix.

Figure 8 MALDI-TOF mass spectrum of tryptic digests of recombinant human erythropoietin using α-cyano-4-hydroxycinnamic acid as matrix.