To streamline cell culture process development, surface plasmon resonance (SPR) biosensors offer a versatile platform for the rapid quantification and quality analysis of recombinant proteins. As a representative case study, the present chapter details a procedure employing a SPR biosensor for determining the differential sialylation levels of recombinant interferon α2b contained in cell culture samples, using immobilized Sambucus nigra lectin. Of interest, this semiquantitative approach can be adapted to work with other lectins with unique carbohydrate-binding specificities, enabling a wide range of product characterization analysis.
Keywords: Product quality assessment; Product sialylation; Recombinant glycoprotein; Surface plasmon resonance.