2.2. Preparation of microbial electrode and assay
procedure
The pre-treatment and immobilisation of yeast cells has
been described elsewhere [23].
The oxygen sensor MF-2100 consists in a platinum electrode,
and an Ag/AgCl electrode, as reference electrode,
covered with an oxygen permeable membrane. The internal
electrolyte is based on manganese hydroxide in 0.1M KCl.
Potentiometric measurements were realised using an electrochemical
workstation BAS 100B/W (Bioanalytical System,
West Lafayette, IN), and data display and recording
were supported by BAS electrochemical software version
3.2. Spectrometric measurements were performed with a
JASCO Uv-Vis 540 spectromphotometer.
The immobilised micro-organisms were placed on the
oxygen membrane and covered with a dialysis membrane
(DM) and fixed with a rubber ring.
All the determinations were carried out in a 10ml measuring
cell and all the solutions were previously saturated
with oxygen. Before every determination, the biosensor was
kept in oxygen-saturated phosphate buffer solution. After the
output signal of the microbial sensor became stable, the sensor
was removed to a buffered standard solution of ethanol
(saturated with oxygen).
2.2. Preparation of microbial electrode and assayprocedureThe pre-treatment and immobilisation of yeast cells hasbeen described elsewhere [23].The oxygen sensor MF-2100 consists in a platinum electrode,and an Ag/AgCl electrode, as reference electrode,covered with an oxygen permeable membrane. The internalelectrolyte is based on manganese hydroxide in 0.1M KCl.Potentiometric measurements were realised using an electrochemicalworkstation BAS 100B/W (Bioanalytical System,West Lafayette, IN), and data display and recordingwere supported by BAS electrochemical software version3.2. Spectrometric measurements were performed with aJASCO Uv-Vis 540 spectromphotometer.The immobilised micro-organisms were placed on theoxygen membrane and covered with a dialysis membrane(DM) and fixed with a rubber ring.All the determinations were carried out in a 10ml measuringcell and all the solutions were previously saturatedwith oxygen. Before every determination, the biosensor waskept in oxygen-saturated phosphate buffer solution. After theoutput signal of the microbial sensor became stable, the sensorwas removed to a buffered standard solution of ethanol(saturated with oxygen).
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