Automatic flow injection based methodologies for determination of scavenging capacity against biologically relevant reactive species of oxygen and nitrogen.
Redox reactions are the heart of numerous biochemical pathways found in cellular chemistry, generating reactive oxygen species (ROS) and reactive nitrogen species (RNS), that includes superoxide anion radical (O2-), hydrogen peroxide (H2O2), hydroxyl radical (HO), singlet oxygen ((1)O2), hypochlorite anion (OCl-), peroxynitrite anion (ONOO-) and nitric oxide radical (NO). The measurement of scavenging capacity against these reactive species presents new challenges, which can be met by flow injection analysis (FIA). In the present review several methods based on FIA and also on its predecessors computer-controlled techniques (sequential injection analysis, multisyringe flow injection analysis, multicommutated and multipumping flow systems) are critically discussed. The selectivity and applicability of the methodology, the generation and detection of the target reactive species, the benefits and limitations of automation when compared to batch methods are some of the issues addressed.
Magalhães
Luís M
LM
REQUIMTE, Serviço de Química-Física, Universidade do Porto, Rua Aníbal Cunha 164, Porto 4099-030, Portugal.
Lúcio
Marlene
M
Segundo
Marcela A
MA
Reis
Salette
S
Lima
José L F C
JL
D000818:Animals; D017022:Flow Injection Analysis / Q000379:methods*; D016166:Free Radical Scavengers / Q000032:analysis*; D006801:Humans; D010084:Oxidation-Reduction; D026361:Reactive Nitrogen Species / Q000737:chemistry*; D017382:Reactive Oxygen Species / Q000737:chemistry*
D016166:Free Radical Scavengers; D026361:Reactive Nitrogen Species; D017382:Reactive Oxygen Species