Stability of cytochrome P450 enzymes in human liver samples stored in different tissue preservation buffers.

The effects of various tissue preservation buffers on cytochrome P450 (P450)-mediated activities of microsomes prepared from fresh surgical liver samples were examined. Two individual human liver samples were obtained, and three portions of each were preserved in one of three solutions: phosphate buffer, Krebs-Heinseleit solution, or University of Wisconsin solution. Microsomes were prepared within 24 h, 3 days, and 7 days after the resection of the samples.