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Method 1 Place the fresh tissue into pre-cooling normal saline and wash several times to clean the blood on the surface Weigh the tissue samples, cut into pieces before adding to a glass homogenizer 2 Homogenize tissue samples in 1ml of extraction reagent per 01g of tissue (Increase the amount of extraction reagent if the samples were not lysed completely, Reduce the amount of extraction reagent if need protein samples with high concentration) Add PMSF (100mmol/ml) before using and dilute to 1m mol/ml 3 Homogenization using a glass homogenizer until the tissue samples were lysed completely 4 Centrifuge for 3-5 minutes at 10000-14000 g Get the supernatant solution, and do the next steps