Enzyme kinetics of Turnip Peroxidase
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1 Contents 1 Enzyme kinetics of Turnip Peroxidase 2 Set-up and Calibrate LabQuest with SpectroVis Plus 3 Effect of ph on Peroxidase Activity 4 Effect of Temperature on Peroxidase Activity 5 Effect of Substrate Concentration on Peroxidase Activity 6 Effect of Enzyme Concentration on Peroxidase Activity Enzyme kinetics of Turnip Peroxidase Hydrogen peroxide (H2O2) is a strong oxidizing agent that can damage cells and is formed as a by-product of oxygen consumption. Fortunately, aerobic cells contain peroxidases that break down peroxide into water and oxygen. This enzyme reduces hydrogen peroxide into H2O by oxidizing an organic compound (AH2 -> A). This exercise uses turnip extract as a source of peroxidase. This turnip extract requires a source of electrons (a reducing agent) in order for the reaction to occur. In this case, a colorless organic compound called guaiacol is used. Guaiacol is oxidized in the process of converting the peroxide and becomes brown. Enzymatic activity can then be traced using a spectrophotometer to measure the amount of brown being formed. Set-up and Calibrate LabQuest with SpectroVis Plus 1. Set-up a cuvette to serve as a Blank 3. Add 20 drops of ph 7 buffer 4. Add 10 drops extraction buffered 2. Connect a LabQuest2 to a SpectroVis plus and start the data collection program 3. Calibrate the SpectroVis 1. Change Mode 1. Select Time-Based from the dropdown menu Rate: 0.5 samples/s Interval: 2 s/sample CC-BY-NC-SA Jeremy Seto New York City College of Technology 1
2 Duration: 200 s 1. OK 2. Press Play button (green arrow) 1. Perform Warm-up for 90 seconds 1. Choose Finish Calibration 2. Press OK 2. Press Stop button Red Square 2. Select Meter Icon (top left most of display) 1. Press the large red area showing the current absorbance reading 2. Choose Change Wavelength 3. Set Wavelength to 500nm Effect of ph on Peroxidase Activity 1. Set-up cuvette for ph 3 3. Add 20 drops of ph 3 buffer 4. Add 10 drops turnip extraction last 2. Sequentially repeat the experiment exchanging the ph buffer with ph 5, 7, 10 CC-BY-NC-SA Jeremy Seto New York City College of Technology 2
3 Effect of Temperature on Peroxidase Activity 1. Set-up cuvette for 0ºC (incubated at 0ºC for 10 minutes) 3. Add 20 drops of extraction buffer at 0ºC 4. Add 10 drops turnip extraction (incubated at 0ºC for 10 minutes) last 2. Sequentially repeat the experiment exchanging the buffers stored at 20ºC, 40ºC, 60ºC Effect of Substrate Concentration on Peroxidase Activity 1. Set-up cuvette for 1X substrate CC-BY-NC-SA Jeremy Seto New York City College of Technology 3
4 Add 20 drops of extraction buffer Add 10 drops turnip extraction last Quickly invert the cuvette and place the cuvette into the Spectrovis Plus Press play button to begin recording data (choose discard data if prompted) 2. Sequentially repeat the experiment with differing amounts of buffer and peroxide: 1. Repeat the experiment with 0.2X substrate and export data to USB drive 2. Repeat the experiment with 2X substrate and export data to USB drive 3. Repeat the experiment with 3X substrate and export data to USB drive Effect of Enzyme Concentration on Peroxidase Activity 1. Set-up cuvette for 1X enzyme 3. Add 20 drops of extraction buffer 4. Add 10 drops turnip extraction last CC-BY-NC-SA Jeremy Seto New York City College of Technology 4
5 2. Sequentially repeat the experiment with differing amounts of buffer and extract: 1. Perform the experiment on 1X enzyme and export data to USB drive 2. Repeat the experiment with 0.2X enzyme and export data to USB drive 3. Repeat the experiment with 2X enzyme and export data to USB drive 4. Repeat the experiment with 3X enzyme and export data to USB drive Tags: quantitative reasoning CC-BY-NC-SA Jeremy Seto New York City College of Technology 5
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