Used to prevent protein degradation during extraction from plant cells and tissues by inhibiting proteolytic enzymes. Maintains protein integrity for downstream applications such as Western blotting, enzyme assays, immunoprecipitation, and protein purification. Effective in preserving labile proteins and reducing sample loss due to protease activity. Suitable for use in a wide range of plant species and tissue types, including leaves, roots, and seeds. Often added directly to lysis buffers to ensure immediate protection upon cell disruption.