Imperial College London

Professor Tony Cass

Faculty of Natural SciencesDepartment of Chemistry

Professor of Chemistry



+44 (0)20 7594 5195t.cass




301KMolecular Sciences Research HubWhite City Campus






BibTex format

author = {Rawson, TM and Sharma, S and Georgiou, P and Holmes, A and Cass, A and O'Hare, D},
doi = {10.1016/j.elecom.2017.07.011},
pages = {1--5},
title = {Towards a minimally invasive device for beta-lactam monitoring in humans},
url = {},
volume = {82},
year = {2017}

RIS format (EndNote, RefMan)

AB - Antimicrobial resistance is a leading patient safety issue. There is a need to develop novel mechanisms for monitoring and subsequently improving the precision of how we use antibiotics. A surface modified microneedle array was developed for monitoring beta-lactam antibiotic levels in human interstitial fluid. The sensor was fabricated by anodically electrodepositing iridium oxide (AEIROF) onto a platinum surface on the microneedle followed by fixation of beta-lactamase enzyme within a hydrogel. Calibration of the sensor was performed to penicillin-G in buffer solution (PBS) and artificial interstitial fluid (ISF). Further calibration of a platinum disc electrode was undertaken using amoxicillin and ceftriaxone. Open-circuit potentials were performed and data analysed using the Hill equation and log(concentration [M]) plots. The microneedle sensor demonstrated high reproducibility between penicillin-G runs in PBS with mean Km (± 1SD) = 0.0044 ± 0.0013 M and mean slope function of log(concentration plots) 29 ± 1.80 mV/decade (r2 = 0.933). Response was reproducible after 28 days storage at 4 °C. In artificial ISF, the sensors response was Km (± 1SD) = 0.0077 ± 0.0187 M and a slope function of 34 ± 1.85 mv/decade (r2 = 0.995). Our results suggest that microneedle array based beta-lactam sensing may be a future application of this AEIROF based enzymatic sensor.
AU - Rawson,TM
AU - Sharma,S
AU - Georgiou,P
AU - Holmes,A
AU - Cass,A
AU - O'Hare,D
DO - 10.1016/j.elecom.2017.07.011
EP - 5
PY - 2017///
SN - 1388-2481
SP - 1
TI - Towards a minimally invasive device for beta-lactam monitoring in humans
UR -
UR -
UR -
VL - 82
ER -