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• W2040586895 abstract "Online monitoring of serotonin in striatal dialysate from freely moving rats was carried out for more than 16 h at 1 min time resolution using microdialysis coupled online to a capillary HPLC system operating at about 500 bar and 50 °C. Several aspects of the system were optimized toward robust, in vivo online measurements. A two-loop, eight-port rotary injection valve demonstrated better consistency of continuous injections than the more commonly used two-loop, 10-port valve. A six-port loop injector for introducing stimulating solutions (stimulus injector) was placed in-line between the syringe pump and microdialysis probe. We minimized solute dispersion by using capillary tubing (75 μm inside diameter, 70 cm long) for the probe inlet and outlet. In vitro assessment of concentration dispersion during transport with a 30 s time resolution showed that the dispersion standard deviation for serotonin was well within the desired system temporal resolution. Each 30 or 60 s measurement reflects the integral of the true time response over the measurement time. We have accounted for this mathematically in determining the concentration dispersion during transport. The delay time between a concentration change at the probe and its detection is 7 min. The timing of injections from the stimulus injector and the cycle time for the HPLC monitoring of the flow stream were controlled. The electrochemical detector contained a 13 μm spacer to minimize detector dead volume. During in vivo experiments, retention time and separation efficiency were stable and reproducible. There was no statistically significant change over 5.5 h in the electrochemical detector sensitivity factor for serotonin. Dialysate serotonin concentrations change significantly in response to a 120 mM K+ stimulus. Release of serotonin evoked by a 10 min, 120 mM K+ stimulation, but not for other K+ stimuli, exhibited a reproducible, oscillating profile of dialysate serotonin concentration versus time. Infusion of fluoxetine, a serotonin uptake inhibitor, increased dialysate serotonin concentrations and stimulated release magnitude. Transient serotonin increases were observed in response to the stress associated with unexpected handling. This system is simple, efficient, reliable, and suitable for the study of serotonin neurochemistry associated with emotion and behavior." @default.
• W2040586895 created "2016-06-24" @default.
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• W2040586895 date "2013-09-24" @default.
• W2040586895 modified "2023-10-17" @default.
• W2040586895 title "In Vivo Monitoring of Serotonin in the Striatum of Freely Moving Rats with One Minute Temporal Resolution by Online Microdialysis–Capillary High-Performance Liquid Chromatography at Elevated Temperature and Pressure" @default.
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• W2040586895 doi "https://doi.org/10.1021/ac4023605" @default.
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