User:Elizabeth Ghias/Notebook/Experimental Biological Chemistry/2012/02/07: Difference between revisions
(Autocreate 2012/02/07 Entry for User:Elizabeth_Ghias/Notebook/Experimental_Biological_Chemistry) |
No edit summary |
||
(5 intermediate revisions by the same user not shown) | |||
Line 10: | Line 10: | ||
==Objective== | ==Objective== | ||
To determine the number of lysine residues in 1 mL of 17.7 and calculate the amount of Tris and HCl needed to create a Tris buffer with a pH of 8.5. | |||
==Description== | ==Description== | ||
# The amount of Tris and the volume of HCl needed to make 250 mL of a 50mM tris buffer was calculated. | |||
# The amount of dye needed to react with 1 mL of BSA (one large scale reaction mixture) was calculated by determining the number of lysine residues in one molecule of BSA, the total number of lysine residues in 1 mL of BSA, and the number of dye molecules that are needed to react with the total number of lysine residues. | |||
==Data== | ==Data== | ||
* | <u>Tris Buffer Calculations</u> | ||
8.5 = 8.06 + log[salt]/[acid] | |||
[salt]/[acid] = 2.754 | |||
(50-x)/x = 2.754 --> x = 13.318 mM = [HCl] | |||
(0.013318 M)(0.25 L) = (0.948 M)(x L) | |||
x = 3.512 mL HCl | |||
(0.050 M Tris)(0.25 L)(121.14 g/mol) = 1.514 g Tris | |||
<u>Mass of Dye for Reaction Calculations</u> | |||
* There are 60 lysine residues in one molecule of BSA | |||
* MW of dye = 573.51 g/mol, MW BSA = 66463 Da | |||
* We are going to add an excess of three dye molecules for every one lysine residue. | |||
1.77 x 10<sup>-7</sup> M BSA x 0.001 L = 1.77 x 10<sup>-8</sup> mol BSA | |||
1.77 x 10<sup>-8</sup> mol BSA x 6.022 x 10<sup>23</sup> molecules/mol = 1.066 x 10<sup>16</sup> molecules BSA | |||
1.066 x 10<sup>16</sup> molecules BSA x 60 lysine residues = 6.393 x 10<sup>17</sup> total lysine residues | |||
6.393 x 10<sup>17</sup> total lysine residues x 3 = 1.918 x 10<sup>18</sup> dye molecules needed | |||
1.918 x 10<sup>18</sup> dye molecules x 1 mol/(6.022 x 10<sup>23</sup> molecules) = 3.186 x 10<sup>-6</sup> mol dye | |||
3.186 x 10<sup>-6</sup> mol dye x 573.51 g/mol = 1.83 mg dye | |||
==Notes== | ==Notes== | ||
[[Category:Course]] | [[Category:Course]] |
Revision as of 10:55, 8 February 2012
Experimental Biological Chemistry | <html><img src="/images/9/94/Report.png" border="0" /></html> Main project page <html><img src="/images/c/c3/Resultset_previous.png" border="0" /></html>Previous entry<html> </html>Next entry<html><img src="/images/5/5c/Resultset_next.png" border="0" /></html> |
ObjectiveTo determine the number of lysine residues in 1 mL of 17.7 and calculate the amount of Tris and HCl needed to create a Tris buffer with a pH of 8.5. Description
DataTris Buffer Calculations 8.5 = 8.06 + log[salt]/[acid] [salt]/[acid] = 2.754 (50-x)/x = 2.754 --> x = 13.318 mM = [HCl] (0.013318 M)(0.25 L) = (0.948 M)(x L) x = 3.512 mL HCl (0.050 M Tris)(0.25 L)(121.14 g/mol) = 1.514 g Tris
1.77 x 10-7 M BSA x 0.001 L = 1.77 x 10-8 mol BSA 1.77 x 10-8 mol BSA x 6.022 x 1023 molecules/mol = 1.066 x 1016 molecules BSA 1.066 x 1016 molecules BSA x 60 lysine residues = 6.393 x 1017 total lysine residues 6.393 x 1017 total lysine residues x 3 = 1.918 x 1018 dye molecules needed 1.918 x 1018 dye molecules x 1 mol/(6.022 x 1023 molecules) = 3.186 x 10-6 mol dye 3.186 x 10-6 mol dye x 573.51 g/mol = 1.83 mg dye
Notes
|