Measurement of ligand distribution in individual adsorbent particles using confocal scanning laser microscopy and confocal micro-Raman spectroscopy.

Two methods, confocal scanning laser microscopy and confocal micro-Raman spectroscopy were used to analyse the distribution of IgG antibodies immobilized on CNBr-activated agarose beads. In the first method the internal distribution profile of fluorescent labelled Protein A was used as an indirect measure of the distribution of IgG, while the second method detects vibrations originating from aromatic amino acids present in the immobilized antibodies. Both these methods indicate an homogeneous ligand distribution within IgG Sepharose 4 Fast Flow and IgG Sepharose 6 Fast Flow.