Difference between revisions of "User:Moira M. Esson/Notebook/CHEM-571/2013/09/24"

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(General Protocol)
(General Protocol)
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##*Store prepared samples in the fridge
 
##*Store prepared samples in the fridge
 
##UV-vis sample preparation
 
##UV-vis sample preparation
###*Remove 0.75mL of sample(either pepsin or pepstatin) and add 0.75mL perchloric acid
+
##*Remove 0.75mL of sample(either pepsin or pepstatin) and add 0.75mL perchloric acid
 
#Repeat step 4 for two hours.
 
#Repeat step 4 for two hours.
  

Revision as of 11:34, 24 September 2013

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Objectives

  1. Observe the catalytic activity of pepsin and pepstatin.
  2. Collect four samples each of pepsin and pepstatin for SDS-PAGE to be run tomorrow.
  3. Run UV-vis to observe the effects of pepsin and pepstatin.


General Protocol

The following protocol was derived from this reference.

  1. Combine 5mL hemoglobin with 8.333μL of 1.2E-6M pepsin to make a solution with a final concentration of 2nM.
  2. Prepare a 5mL sample of hemoglobin with 83.3μL of 1.2mM pepstatin to make a solution with a final concentration of 20μM.
  3. Incubate these solutions at 37°C
  4. After 30 minutes, remove the two samples to prepare samples for SDS-PAGE and UV-vis
    1. SDS-PAGE sample preparation
      • Remove 10μL sample and dilute the sample to 1mL with 50mM Glycine-HCl buffer.
      • Take 10μL of the diluted sample and add 10μL of SDS-PAGE buffer.
      • Store prepared samples in the fridge
    2. UV-vis sample preparation
      • Remove 0.75mL of sample(either pepsin or pepstatin) and add 0.75mL perchloric acid
  5. Repeat step 4 for two hours.