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DPV of (a) ssDNA-NH2/nano-Au/c-MWCNTs electrode and (b–g) hybridization with L. interrogans ssG-DNA using 1 mM MB in 50 mM PBS, pH 7. The inset a shows hyperbolic curve from 0 to 25 ng/6 µl with linear peak current (Ip) up to 1.5 ng/6 µl of ssG-DNA of L. interrogans. Inset b shows the linear plot from 0 to 1.5 ng/6 µl ssG-DNA for calculation of sensitivity and LOD
