A carbositall electrode modified with a SiO2-hemoglobin-gold film as a promising biosensing element

The analytical prospects of a carbositall electrode modified with a film based on SiO2, hemoglobin (Hb), and gold nanoparticles (CSE SiO2-Hb-Au), prepared by deposition with an electrically generated catalyst, are reported. Hemoglobin on the surface of CSE SiO2-Hb-Au is shown to possess electrocatalytic activity toward dissolved oxygen, giving a rationale for the development of a rapid voltammetric procedure of O2 quantification with a detection limit of 0.1 mg/L. The inhibition activity of a number of nitrogen-containing organic substances to the catalytic current CSE SiO2-Hb-Au is studied. A voltammetric procedure is proposed for determination of the anti-flu drug rimantadine, 1-(1-adamantyl)ethylamine hydrochloride, with a detection limit of 0.4 mg/L. The procedure is applicable to the quantification of rimantadine in blood serum and saliva.