Abstract
We developed a method to completely regenerate the gold (Au) surface of 3-aminopropyltriethoxysilane (APTES)-functionalized Au-coated surface plasmon resonance (SPR) chip that had been used for human fetuin A (HFA) immunoassay. It involved treatment of the used SPR chip with freshly prepared piranha solution (concentrated H2SO4/30% H2O2=3:1, v/v) for 15min followed by extensive rinsing with ethanol and deionized water. The developed method enabled prolonged reuse of the regenerated SPR chip that increased its cost-effectiveness without affecting the reproducibility of HFA immunoassays.
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