Development and Characterization of a Collagen Degradation Assay to Assess Purified Collagenase Used in Islet Isolation by Jessica Helweg | Jan 3, 2017 McCarthy RC, Spurlin B, Wright MJ, Breite AG, Sturdevant LK, Dwulet CS, et al. Development and characterization of a collagen degradation assay to assess purified collagenase used in islet isolation. Transplant Proc. 2008;40(2):339-42.