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Prepare serial dilutions of 0.1 M Tris buffer stock solution at the following concentrations: 10 mM, 1 mM, 100 μM, 10 μM.
Remake Au and BSA stock solutions to check for contamination.
Resuspend Au/BSA fibers in different concentrations of pH 8 or 10 Tris buffer.
Protocol for Resuspending Au/BSA Fibers
Au/BSA solutions were centrifuged at 3000 rpm, 25°C, for 5 min, such that the fibers formed a pellet at the bottom of the centrifuge tube.
1 mL of 10 mM pH 8 Tris buffer was added to each pellet and pipetted up and down to resuspend the fibers.
Step two was repeated with Tris buffer at concentrations of 1 mM, 100 μM, and 10 μM on fibers with arbitrary Au/BSA mole ratios.
Steps 2 and 3 were repeated with pH 10 Tris buffer.
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