title: Fabrication of a metal-cored multi-barrelled microiontophoresis assembly.
abstract: A method is described for fabrication of 7-barrelled microiontophoresis electrodes with a center barrel of platinum-coated tungsten. The electrodes require a minimum of expensive apparatus and can be fabricated in an hour or two. The electrodes have low recording impedance (typically 100 k omega and low resistance iontophoresis barrels (typically 20-50 M omega). Compared to electrodes with a micropipette recording barrel, these electrodes are practically noise-free and can pass ionotophoretic currents of up to 200 nA without an appreciable increase in recording noise.
authors.affiliation: Department of Neurology, Prince Henry Hospital and School of Medicine, University of New South Wales, Sydney, Australia.
authors.forename: M
authors.initials: M
authors.lastname: Hellier
authors.forename: P
authors.initials: P
authors.lastname: Boers
authors.forename: G A
authors.initials: GA
authors.lastname: Lambert
mesh_terms: D005898:Glass; D007478:Iontophoresis / Q000295:instrumentation*; D008839:Microelectrodes