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(a) Surface plasmon resonance (SPR) spectrum on the conjugation of TEMPO-oxidized β-cyclodextrin on the CNF surface with EDC/NHS chemistry by using chitosan as an anchor. (b) SPR spectra on the adsorption of 17α-ethinyl estradiol (EE2) on the chitosan modified CNF with (blue curve) and without (green curve) conjugated β-cyclodextrin.
