Unfortunately, there is no protocol provided for this product. This product should be reconstituted with Tris-buffered saline containing 1% BSA and 1 mM calcium chloride. For a similar, previously discontinued product, (L9780) there was a recommendation to reconstitute at 1 mg/mL for the best long term stability. Do not dilute to working concentration until ready to use. Solutions are stable for at least one month at 4 deg. C.
See the link below to review the lipase enzymatic testing method:
https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/product/documents/370/930/l0382enz.pdf