title: A simple and portable device for the quantification of TNF-α in human plasma by means of on-chip magnetic bead-based proximity ligation assay.
abstract: There is a general need in healthcare systems all around the world to reduce costs in terms of time and money without compromising patients outcome. Point-of-Care Testing (POCT) is currently being used in some applications (e.g. POC coagulation devices) as an alternative to already established standard central laboratory tests to overcome sample transportation and long turnaround times. The main objective of this investigation was to quantify Tumour Necrosis Factor-alpha (TNF-α) on-chip within the clinical relevant range of 5-100 pg/mL in human pooled plasma. The novel solid-phase assay developed in this study was a magnetic bead-based proximity ligation assay (PLA) in which one of the assay proximity probes was directly immobilised onto streptavidin-coated magnetic beads. The portable device was based on a disposable and single-use cyclo-olefin polymer (COP) microfluidic chip interfaced with a quantitative real-time polymerase chain reaction (qPCR) device previously developed in-house. Sample volume was 10 µL and total assay time under 3 h. The POC device and assay developed offer portability, smaller reagent and sample consumption, and faster time-to-results compared with standard ELISAs. Determination and monitoring of TNF-α therapy at the point-of-care will help to improve clinical and/or economical outcome in governmental healthcare budgets.
authors: CIC microGUNE, Goiru kalea 9, 20500 Arrasate-Mondragón, Gipuzkoa, Spain. Electronic address: vcastro@cicmicrogune.es.
authors: Vanessa
authors: V
authors: Castro-López
authors: CIC microGUNE, Goiru kalea 9, 20500 Arrasate-Mondragón, Gipuzkoa, Spain; IK4-Ikerlan, P(o) JMª Arizmendiarrieta 2, 20500 Arrasate-Mondragón, Gipuzkoa, Spain.
authors: Jorge
authors: J
authors: Elizalde
authors: POC Microsolutions, Goiru kalea 9, 20500 Arrasate-Mondragón, Gipuzkoa, Spain.
authors: Marcin
authors: M
authors: Pacek
authors: Department of Gastroenterology, Hospital Donostia/Instituto Biodonostia, Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), Universidad del País Vasco UPV/EHU, San Sebastián, Spain.
authors: Elizabeth
authors: E
authors: Hijona
authors: Department of Gastroenterology, Hospital Donostia/Instituto Biodonostia, Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), Universidad del País Vasco UPV/EHU, San Sebastián, Spain.
authors: Luis
authors: L
authors: Bujanda
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation; D004867:Equipment Design; D006801:Humans; D057230:Limit of Detection; D046210:Microfluidic Analytical Techniques / Q000295:instrumentation*; D019095:Point-of-Care Systems; D060888:Real-Time Polymerase Chain Reaction / Q000295:instrumentation; D014409:Tumor Necrosis Factor-alpha / Q000097:blood*
chemical_list: D014409:Tumor Necrosis Factor-alpha
keywords: COP; Microfluidic chip; Point-of-care; Solid-phase proximity ligation assay; TNF-α; qPCR