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. Author manuscript; available in PMC: 2011 Mar 1.
Published in final edited form as: Anal Biochem. 2009 Nov 11;398(1):93–98. doi: 10.1016/j.ab.2009.11.010

Fig. 1.

Fig. 1

Outline of the ICP-MS based protease assay. The protease substrate was digested with α-chymotrypsin. The undigested substrate was separated from the digestion product by adding streptavidin agarose bead suspension followed by centrifuging. The supernatant was analyzed for lutetium signal by ICP-MS after dilution.