User:Elaine Marie Robbins/Notebook/CHEM-496/2012/02/01

Effects of Tris on AuNP

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Objective To determine the effects of tris buffer (pH 10.1) on nanoparticle solution and protein fiber solution as a function of concentration and time. Description Take UV-vis data of 70 and 166 Au/BSA solutions prepared on 01/31/12. Take UV-vis data of 0.9 mL of each AuNP solution + 0.1 mL of the following dilutions of tris (pH 10.1): 50 mM 5.0 mM 0.50 mM 0.050 mM Continue to take UV-vis data of 0.9 mL 70 Au/BSA ratio + 0.1 mL 50 mM tris buffer solution over time. Continue to take UV-vis data of 1 mL 70 Au/BSA ratio solution over time. Data Graph of the absorbance vs wavelength data shift due to change in buffer concentration for 70 Au/BSA ratio solution: Graph of the absorbance vs wavelength data shift due to change in buffer concentration for 166 Au/BSA ratio solution: Graph of the absorbance vs wavelength data shift due to time elapse for 70 Au/BSA ratio solution: Graph of the peak absorbance vs -log(ion strength of tris buffer solution): Graph of the peak wavelength vs -log(ion strength of tris buffer solution): Notes The only buffer concentration that produced a shift for the 70 Au/BSA ratio solution in the peak absorbance value was the 50 mM Tris buffer solution (pH 10.1). No change was observed in the 166 Au/BSA ratio solution. Absorbance values increase as time elapses for the 70 Au/BSA ratio solution, however there is no shift in peak absorbance value.