1. Catalase Lab Intro
Using a standard curve to determine the concentration of enzyme in an unknown sample.

2. Using a standard curve
Definition - a type of graph used as a quantitative research technique.
Multiple samples with known properties are measured and graphed, which then allows the same properties to be determined for unknown samples by interpolation on the graph.
The samples with known properties are the standards, and the graph is the standard curve.

3. How can standard curves be used ?
See sample lab document for glucose testing
Research other uses for your formal lab introduction!

4. Examples of Standard Curves
What is the X axis?
What is the Y axis?

5. How will we use a standard curve today?
Predict unknown concentration when you test for the independent variable.
“Assay”: analytic procedure to quantitatively measure the amount of activity in a sample.
Use the results of the “assay” to predict unknown concentration.

6. Your job
Figure out the role of catalase in cell and why it is essential in cells.
Design a standard curve to assay for the concentration of catalase in an unknown sample.
Determine what type of best fit line fits your data.
Estimate the concentration.
Suggest a second run based on the information you found to further refine your value.
Connect the methods for this lab to a real-world problem.

7. Our Model System What does catalase do? H2O2  H2O + O2
What can you “assay” for?

8. Lab Scenario Catalase:
You are working for a drug company and you want to make a “generic” of the enzyme based drug another company produces.
You must determine how much of the active ingredient is present in the drug.
Your research in the papers suggests the concentration is between
.1 and 10% (mass (g)/volume (ml))
The closer to the exact amount you can come, the better your generic will work!

9. Methods and Materials Shared Materials: Individual Materials:
Bottles of 6% and 3% H2O2
2 blenders (must be cleaned with soap at the end!)
2 electronic balances
Individual Materials:
~25 g liver—source of catalase
Conical tubes for reactions
2-disposable pipettes
2-1mL graduated pipettes
Weigh boats
50 mL grad cylinder
250 mL beaker

10. Lab Design
Determine the independent and dependent variables to set up your standard curve
What will you control for?
FOCUS: What would I need to know to exactly repeat your methods?

11. Data Analysis
Is your curve linear? logrithmic? How do you know which type of line to choose?
Statistical Tool #3 – Residuals!
Calculate “Y hat”
This is the Y value for each X if the equation is used (rather than having your values be plotted)
Residual = Yobserved-Yhat
Graph residuals vs. X. If there is no pattern, then the regression line captures the overall pattern.