The recommended cell lysis method for this assay is sonication to avoid the use of detergents. However, a detergent such as Triton X-100 is expected to be compatible with the assay. An example of a cell lysis protocol for 0.4-2.0 x 10^5 HeLa cells is as follows:
Harvest cells by centrifugation at 2,000 x g for 5 minutes at 4°C or by trypsinization for adherent cells.
Homogenize or sonicate cells in PBS for ten minutes.
Centrifuge at 10,000 x g for 5 minutes at 4°C.
Remove the supernatant for the assay.
If a lysis buffer is preferred, avoid Tris-based buffers as they may interfere with the assay. Additionally, the following substances should be avoided as they may inhibit the kit's collagenase: EDTA, EGTA, cysteine, histidine, DTT, 2-mercaptoethanol, o-phenanthroline, Hg2+, Pb2+, Cd2+, and Cu2+. The assay is designed to detect type 1 collagen. Although type 3 collagen has not been explicitly tested, it is expected to be detected as well due to structural similarities.



