RE: Sensitive Optical Biosensing using Affimers11 Feb 2021 10:59
https://biologicalsciences.leeds.ac.uk/school-biomedical-sciences/staff/115/professor-paul-millner
Professor Paul Millner
Areas of expertise: electrochemical biosensors: nanobiosensors; conjugation of biomolecules; targeted nanoparticles for imaging and drug delivery; PDI for water sterilisation.
We have developed a new reagentless immunosensor platform which allows highly sensitive single step measurement of a wide range of substances, based on affinity immobilisation of tagged antibodies to self assembled mixed monolayers (Fig. 1) or to electropolymerised polyaniline layers (EC Project ELISHA - see www.immunosensors.com). Immunosensors for antibiotics, herbicides, cardiac, cancer and neurodegenerative disease markers have been developed, viruses and bacteria. Sensors for host biomarkers of bacterail and viral infection are are also being developed. The biorecognition element can be an antibody or fragment but increasingly are Affimers, (synthetic binding proteins developed by the McPherson & Tomlinson groups at Leeds). In particular, we are interested in the nanoscale structure of the sensor surface and how this influences the impedance signals observed.
Nanoparticle and microparticles:
Work is ongoing to develop nanoparticles of various compositions as enzyme for applications in biosensing, bioimaging and targeted drug delivery. Biosilicate nanoparticles of defined dimensions and biosilicate surface coating have been produced which can entrap and/or stabilise commercially interesting enzymes (EC Project SANTS - www.sants-nanosilicates.com). More recently, we have shown that antibody or Affimer functionalised nanoparticles are able to locate to cancer tissue in vivo and we are currently colalborating with Dr Arwen Tyler (Food Science) to develop Affimer targeted lipidic nanopartciles capable of delivering hydrophobic anticancer agents directly to cancer tissue. Finally a novel nanobiosensor platform which uses lanathanide nanocomposite up conversion nanoparticles (UCNP) is being optimised; replacement of the complete ELISA protocol with a single addition is possible.