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  1. Buying Glass Capillaries for Making Micropipettes and Microelectrodes
    April 29, 2013
    WPI offers a wide spectrum of high-quality glass capillaries. We take pride in our ability to ship your glass order within 48 hours. If you need a special glass that does not appear in our catalog, please call us. We will make every effort to provide it for you. Fire-Polished glass capillaries are easier to insert into microelectrode holders without damaging the gasket. More importantly, fire-polished glass won’t scratch the chloridized wire used in a recording electrode. Fire-polishing does not affect the glass’s mechanical or electrical properties. Borosilicate glass capillaries: Close dimensional tolerances assure microelectrode uniformity and
  2. Variety of Pre-pulled Micropipettes Available
    April 26, 2013
    Eliminate the cost and trouble of making your own micropipettes — WPI can quickly supply your need for consistently sized pre-pulled glass micropipettes for injection of dyes or proteins into cells, oocytes and for many other biomedical laboratory applications. Tip diameters (ID) range from 0.1 to 10 micrometers. Micropipettes are available as plain shank or with luer fittings. Schott Duran borosilicate glass 0.5 micrometer and smaller ID micropipettes include an internal glass fiber for easy filling Tip inner diameter tolerance ±20% Short taper yields high strength Nominal length ≈ 50 mm OD:ID = 1.33:1 Standard capillary outer diameters are 1.0 mm (thin-wall) or 1.14 mm Every pipette individually tested and inspected Vacuum packed
  3. Micropipette Holders and Half Cells
    April 25, 2013
    WPI’s microelectrode holder-half-cells couple fluid-filled glass micropipettes to high input impedance amplifiers. A Ag/AgCl pellet (or a silver wire) molded into the holder body provides stable potential. Electrical connection is made via male 2mm pins or female 2mm sockets. The pipette may be mounted axially or at right angles to the holder. Pipettes are held with screw-caps or rubber gaskets (without caps). Filling WPI microelectrode holders with electrolytes containing chloride results in stable electrode potential. Suitable electrolytes include KCl, NaCl andCaCl2. Holders are supplied for standard WPI single capillary tubing of 1.0, 1.2, 1.5 and 2.0mm outside diameters. (Call WPI regarding custom designs for other glass diameters.) The holder style you select will depend on your experimental application, space, and instrumentation. Hints for selecting and ordering micropipette holders Determine the required electrical connection on the holder. F
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