eDAQ Picostat, Руководство пользователя

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86 eDAQ Potentiostats
The QuadStat also has the ability to zero (or offset) a background
current signal which can be of use when trying to amplify small peaks
on a large background signal, see
Zero Offset, page 57 .
Many biosensors provide a linear signal response over a range of
concentrations but deviations occur over wider concentration ranges.
The Chart software Multiple Point Calibration extension can be used to
extend the useful range over which a biosensor can be used by
compensating for a non-linear signal response.
Microdialysis Sensor
The Sycopel™ Microdialysis Biosensor is available in several
configurations for both in vivo or in vitro detection of analytes including
glutamate, glucose, glycerol, ascorbate and acetylcholine. The Picostat
and QuadStat have suitable current ranges for use with this sensor, and
Chart software would normally be used to record data.
The QuadStat also has the ability to zero (or offset) a background
current signal which can be of use when trying to amplify small peaks
on a large background signal, see
Zero Offset, page 57 .
The Chart software Multiple Point Calibration extension can be used to
extend the useful range of metabolite concentrations over which this
sensor can be used by compensating for non-linear signal response.
Dissolved Oxygen (dO
2
) Sensors
Usually a polarographic (Clark) oxygen sensor electrode and meter are
purchased from the same manufacturer to ensure matching sensitivity.
However, depending on the current requirements of your oxygen
sensor, the Potentiostat, QuadStat, or Picostat may be a suitable
alternative to a standard meter as they have adjustable sensitivity and
can be matched to a wide range of current signal requirements. In
addition you can use them to alter the polarising voltage to ‘fine tune’
your sensor.
Most polarographic oxygen electrodes comprise a gold or platinum
cathodic working electrode (to which the working electrode lead is
attached) and a silver anodic counter electrode (to which the reference
and auxiliary electrode leads are attached). Usually a reducing