title: A micro-immuno supported liquid membrane assay (mu-ISLMA).
abstract: A chemiluminescent (CL) based micro-immuno supported liquid membrane assay (mu-ISLMA) has been developed that enables clean up, enrichment and detection of simazine in a single miniaturised cartridge system. The mu-ISLM cartridge contains a supported liquid membrane (SLM) sandwiched between a donor and an acceptor plate (channel volumes 1.65 microL), the latter being covered by a thin layer of gold on to which anti-simazine antibodies were covalently immobilised via a self assembled monolayer (SAM) of either dithiobis(11-aminoundecane, hydrochloride) (DTAU) or beta-mercaptoethylamine (beta-MEA). The mu-ISLMA based on DTAU was characterised by both a high apparent extraction efficiency (E(app) = 136%) and high apparent enrichment factor (E(e)(app) = 544), which resulted in a very high sensitivity for simazine (LOD = 0.1 ng L(-1)). The paper discusses the influence of the different SAMs and three different anti-simazine-antibody preparations (polyclonal, affinity purified polyclonal and monoclonal) on the extraction parameters and assay sensitivity. The influence of the sample matrix (e.g. mineral water, orange juice and milk) on the simazine mu-ISLMA was also investigated.
authors.affiliation: Department of Analytical Chemistry, Lund University, Sweden.
authors.forename: Madalina
authors.initials: M
authors.lastname: Tudorache
authors.forename: Jenny
authors.initials: J
authors.lastname: Emnéus
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation* / Q000379:methods; D004784:Environmental Monitoring / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D017022:Flow Injection Analysis / Q000295:instrumentation* / Q000379:methods; D007118:Immunoassay / Q000295:instrumentation* / Q000379:methods; D008163:Luminescent Measurements / Q000295:instrumentation* / Q000379:methods; D008567:Membranes, Artificial; D046210:Microfluidic Analytical Techniques / Q000295:instrumentation* / Q000379:methods; D008904:Miniaturization; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012839:Simazine / Q000032:analysis*; D012996:Solutions
chemical_list: D008567:Membranes, Artificial; D012996:Solutions; D012839:Simazine