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Moreover, the ionic current response from the BSA-Au NC film can be used to quantify cysteine in a broad dynamic range of 0.001-1 pM with a detection limit as low as 1 fM. Such a strategy can be used to detect biothiols in complex biological fluids such as human serum. Therefore, the present work provided a new design strategy for a glass nanopipette sensor inspired by the principles of numerous and diverse fluorometric assays. It also sheds light on how the coupling of electrical and optical signals improves the accuracy, sensitivity, a
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