User:Eleni N. Kalivas/Notebook/CHEM-571/2013/09/25

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Objective To run electrophoresis(SDS-PAGE) and UV vis on the pepsin and pepstatin prepared on 09/24/13. Protocol General Protocol: Prepare the gel and assemble the electrophoresis cell Refer here for exact details on how to assemble the unit. Remove comb and tape from the gel Rinse the walls with running buffer (30.0 Tris, 44.1g glycine, 10g SDS, H2O to 1L) Assemble cell Fill the inner and outer buffer chambers with running buffer Load samples prepared yesterday Note: Also loaded two hemeglobin samples for comparison and pepsin and pepstatin reactions left overnight(these were prepared in the same fashion as 2013/09/24. In total ran 12 samples. Note: Loaded entire 20μL samples Run electrophoresis for 30 minutes at 200V Develop stain of the gel Place gel in fixant solution (40% methanol, 10% acetic acid, 50% water) for 20 minutes to stop the proteins from migrating further Place gel in Stain Solution (0.025% (w/v) Coomassie Blue, 10% acetic acid, 90% water) for 1 hour Place gel in Destain Solution (10% acetic acid, 90% water) for 15 minutes Repeat last part of step 4 twice. Sample Set-up of the electrophoresis (SDS-PAGE) Well Numbers Sample 1 Hemoglobin 2 Pepsin 3 Pepstatin 4 0.5hrs Pepsin 5 0.5 hrs Pepstatin 6 1 hr Pepsin 7 1 hr Pepstatin 8 1.5hrs Pepsin 9 1.5 hrs Pepstatin 10 2hrs Pepsin 11 2hrs Pepstatin 12 Hemoglobin Image of SDS Electrophoresis UV vis Corrected Absorbance Spectra of Pepsin with Hemoglobin NOTES: For the 2 hour sample some pieces of protein may have been present when running the sample. Corrected Absorbance Spectra of 20μM Pepstatin with Hemoglobin