Langmuir-Blodgett (LB) nano-thin molecular monolayers of phospholipid dipalmitoyl-phosphatidyl-ethanolamine (DPPE) [1] were deposited from aqueous subphase. The DPPE LB films were with a thickness of ~ 3 nm. They were studied as biosensor platform for detection of Cadmium ions (Cd2+). The change of the electrical response of the DPPE LB films due to the presence of Cd2+ ions was characterized by means of electrochemical impedance spectroscopy in the frequency range 1 Hz – 3 MHz, as well as with linear sweep and cyclic DC voltammetry. The electrical measurements were performed by applying a micropipette-drop technique. The obtained results show that in this way one can reliably detect Cd2+ by lipid monolayers. The applied electro-analytical methods have potential to be used for detection of Cd2+ contamination of water, e.g., Cd2+ at concentration level of 1 μg/L.
Langmuir-Blodgett nano-thin monolayers of phospholipids: electrical response to Cadmium ions
Hari Krishna Koduru;Nicola Scaramuzza
2020-01-01
Abstract
Langmuir-Blodgett (LB) nano-thin molecular monolayers of phospholipid dipalmitoyl-phosphatidyl-ethanolamine (DPPE) [1] were deposited from aqueous subphase. The DPPE LB films were with a thickness of ~ 3 nm. They were studied as biosensor platform for detection of Cadmium ions (Cd2+). The change of the electrical response of the DPPE LB films due to the presence of Cd2+ ions was characterized by means of electrochemical impedance spectroscopy in the frequency range 1 Hz – 3 MHz, as well as with linear sweep and cyclic DC voltammetry. The electrical measurements were performed by applying a micropipette-drop technique. The obtained results show that in this way one can reliably detect Cd2+ by lipid monolayers. The applied electro-analytical methods have potential to be used for detection of Cd2+ contamination of water, e.g., Cd2+ at concentration level of 1 μg/L.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
