Capitulo III HPLC detectores Video 12
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This section discusses the characteristics and basic operation of detectors used in HPLC, focusing on the ideal features sought for proper detector functionality.
Characteristics of Ideal Detectors
- Detectors should have a wide dynamic response range to changes in analyte concentration.
- Desired features include linearity, selectivity, appropriate sensitivity, temperature stability, good signal-to-noise ratio, and non-destructive behavior.
- The most common detector in HPLC is the UV-visible detector due to its ability to measure energy absorbed by molecules.
- Detectors should be non-destructive and provide rapid responses for complex samples.
Detector Types in HPLC
This section explores various detectors used in HPLC beyond UV-visible detectors.
Detector Varieties
- Some detectors utilize diode arrays for comprehensive spectral analysis and qualitative identification of compounds.
- Solvent selection is crucial to minimize baseline noise caused by solvent absorbance.
- Evolving detectors like diode array offer improved sensitivity, linearity, selectivity, and real-time absorption spectrum acquisition.
Specialized Detectors and Applications
Specialized detectors cater to specific compound properties and analytical needs in HPLC applications.
Specialized Detector Types
- Fluorescence detectors are suitable for analyzing substances with natural or induced fluorescence due to their high sensitivity and selectivity.
- Refractive index detectors are universal but less sensitive; conductivity detectors are highly sensitive but require pure solvents.
fina dispersión de gotitas
The process involves the final dispersion of droplets through nebulization passing through a hot tube where the solvent evaporates, leaving a cloud of fine solid particles detected at the bottom. Detection occurs through light dispersion from a laser, responding to mass rather than molecular structure or weight.
Process Description
- The nebulized liquid passes through a hot tube for solvent evaporation, resulting in fine solid particle formation.