# User:Melissa Novy/Notebook/CHEM-571/2012/08/29

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## Objectives

• Prepare stock solutions of HAuCl4 and BSA in water.
• Prepare solutions at various ratios of Au to BSA from the stock solutions.

## Stock Solutions

• Prepared 15 μM BSA stock solution in water.
• Prepared 10 mM HAuCl4 stock solution in water.
• Calculations:
• 25 mL of 10 mM HAuCl4 stock solution requires the following:
```  MW HAuCl4: 393.83 g/mol
Mass HAuCl4:
25 mL × (10-3 L/mL) × 10 mM × (10-3 mol/mmol) × 393.83 g/mol = 0.0985 g HAuCl4
Actual mass HAuCl4: 0.0971 g HAuCl4
Actual concentration: 9.862 mM
0.0971g × (1/393.83 g/mol) × (1/(25 × 10-3 L)) × (103 mM/mol) = 9.862 mM HAuCl4 in H2O
```
• 10 mL of 15 μM BSA stock solution requires the following:
```  MW BSA: 66430 g/mol
Mass BSA:
10 mL × (10-3 L/mL) × 15μM × (10-6 mol/mmol) × 66430 g/mol = 0.00996 g BSA
Actua mass: 0.0105 g BSA
Actual concentration: 15.806 μM
0.0105g × (1/66430 g/mol) × (1/(10-3 L)) × (106 μM/mol) = 15.806 μM
```

## Au/BSA Mole Ratios

 μM Ratio [Au/BSA] ' Volume [μL] ' ' BSA HAuCl4 BSA HAuCl4 H2O [mL] 1 60 253.068455 147.93 3.599001545 1 80 253.068455 197.24 3.549691545 1 100 253.068455 246.55 3.500381545 1 120 253.068455 295.86 3.451071545 1 128 253.068455 315.584 3.431347545 1 130 253.068455 320.515 3.426416545 1 132 253.068455 325.446 3.421485545 1 133 253.068455 327.9115 3.419020045 1 134 253.068455 330.377 3.416554545 1 136 253.068455 335.308 3.411623545 1 138 253.068455 340.239 3.406692545 1 140 253.068455 345.17 3.401761545 1 160 253.068455 394.48 3.352451545 1 170 253.068455 419.135 3.327796545

## Notes

• Solutions of Au/BSA were wrapped in foil to prevent them from photoeffects.
• After heating, the oven was turned off and the solutions were left to cool in the oven until needed.