Electrochemical and Hyphenated Electrochemical Detectors in Liquid Chromatography and Flow Injection Systems for Drug Compound Analysis
Abstract
Electrochemical detectors can be very well adapted to hydrodynamic conditions such as those encountered in liquid chromatography (LC), in capillary electrophoresis, or in flow injection analysis (FIA) applied to drug compound analysis [1–10]. Detectors with low cell volume based on conductivity [11–13], potentiometry [14, 15], amperometry (AD) [1–10], or pulsed amperometry (PAD) [16, 17] can be located online in close proximity, in a post-column configuration, to a liquid chromatographic setup or inserted as microelectrodes close to a capillary end [18, 19]. A miniaturized electrolysis cell can also be part of an online in a FIA system or of a pre- or post-LC column coupled to a mass spectrometer for electrochemical product generation and characterization [20–23]. Trends are directed to miniaturize the entire flow analytical system (e.g., lab on chip) and microfabricated electrochemical sensors as ideally suited for such configurations [24–26]. This chapter describes some basic concepts of most used and commercially available amperometric detectors and reactors coupled to LC or FIA. Examples are collected from authors’ laboratory, and a nonexhaustive literature survey of applications to the assay of molecules of pharmacological interest is provided.
Keywords
Hydrodynamic Condition Flow Injection Analysis Carbon Paste Electrode Drug Compound Flow Injection Analysis SystemAbbreviations
- ACN
Acetonitrile
- ACPG
Aminopropyl-controlled pore glass beads
- AER
Anion exchange resin
- amol
Attomole
- BIA
Batch injection analysis
- CFE
Porous carbon felt electrode
- Chi
Chitosan
- ChOx
Choline oxidase
- CME
Chemically modified electrode
- CNT
Carbon nanotube
- CoHCF
Cobalt hexacyanoferrate
- CSCNTs
Cup-stacked carbon nanotubes
- ECL
Electrochemiluminescent
- FIA
Flow injection analysis
- GOx
Glucose oxidase
- HMDE
Hanging mercury-drop electrode
- HRP
Horseradish peroxidase
- ITO
Indium tin oxide
- LOX
Lysine oxidase
- MBRS
Meldola’s Blue-Reinecke Salt
- MWCNT-COOH
Multiwalled carbon nanotube with carboxyl groups
- NADH
Reduced form of nicotinamide adenine dinucleotide
- NS
Not stated
- OSA
1-Octanesulfonic acid
- OSS
Sodium octyl sulfate
- PB
Prussian blue
- PDDA
Poly(diallyldimethylammoniumchloride)
- PEDOT
Poly(3,4-ethylenedioxythiophene)
- PGE
Pyrolytic graphite electrode
- PNDGA
Poly(nordihydroguaiaretic acid)
- PPyox
Overoxidized polypyrrole film
- PVI
Poly(1-vinylimidazole)
- Q
Quercetin
- QDs
CdTe quantum dots
- SDS
Sodium dodecyl sulfate
- SIA
Sequential injection analysis
- SPCE
Screen-printed carbon electrode
- SWAdSV
Square-wave adsorptive-stripping voltammetry
- SWCNT
Single-walled carbon nanotubes
- SWV
Square-wave voltammetry
- TBO
Toluidine blue O
- TEA
Triethylamine
- THF
Tetrahydrofuran
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