User:Javier Vinals Camallonga/Notebook/Javier Vinals notebook/2013/10/08

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To observe and measure ADA turnover kinetics in the absence of an inhibitor. This work will be the basis of our comparison to ADA-AuNP turnover studies.


  1. Make a 40μM solution of adenosine in buffer (50mM phosphate buffer, pH 7.4)
  2. Go to Dr. Hartings lab for enzyme kinetics measurements.
    1. Add 3mL of adenosine solution to the cuvette
    2. Start your kinetics measurement
      1. 1ms integration (on front panel)
      2. 10 scan average (on front panel)
      3. Set "Save the first available scan every" to 15 seconds (after clicking File>Save)
      4. Set "Stop after this amount of time" to 10 minutes (after clicking File>Save)
      5. Set "File Type" to Tab Delimited
      6. Give the files a directory and a name
      7. Click accept
      8. Just before 1 minute add 30ul of 0.01u/mL ADA


  1. Buffer
    1. 0.7318 g of NaH2PO4·H2O and 5.2520g Na2HPO4·7H2O in 500mL water --> 50mM Phosphate buffer pH 74
  2. Adenosine deaminase (ADA) stock
    1. 1.1mg (24.0units in 1 mg) in 25mL of buffer --> 1.1 units/mL ADA
  3. ADA for experiments
    1. 100uL of stock ADA and 900uL buffer --> 0.11 units/mL ADA

After we collected the data, we worked up the data and we found the concentration of inosine and adenosine, based on beer's law, and the peaks 260 and 250, from which we know epsilon, b and the absorbance. After putting the files and working it up, we obtained the graph of Adenosine to Inosine.

"Figure 1. Adenosine to Inosine"

Adenosine to Inosine Javier Vinals.png

"Table 1. System of equation to calculate concentration of Adenosine"

Adenosine Absorbance at time 0 molar absorptivity Initial concentration
at 260 0.511 14025 3.64349*10^-5
at 250 0.433 11884.1977 3.64349*10^-5

"Table 2. System of equation to calculate concentration of Inosine"

Inosine Absorbance at time 0 molar absorptivity Initial concentration
at 260 0 5254.51389 0
at 250 0 11007 0

Then after this, we set up a system of equations to find out the concentration at different points during the time the reaction took, and sketched a graph.

"Figure 2. Change in concentrations from Adenosine to Inosine"

Change in concentration from Adenosine to Inosine for second time, Javier Vinals.png