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Label-free bacteria quantification in blood plasma by a bioprinted microarray based interferometric point-of-care device Priyanka Dey, Nuria Fabri-Faja, Olalla Calvo-Lozano, Roland Terborg, Alexander Belushkin, Filiz Yesilköy, Anna Fàbrega, Juan Carlos Ruiz-Rodriguez, Ricard Ferrer, Juan José González-López, Maria Carmen Estévez, Hatice Altug, Valerio Pruneri, and Laura M. Lechuga ACS Sens., Just Accepted Manuscript • DOI: 10.1021/acssensors.8b00789 • Publication Date (Web): 07 Dec 2018 Downloaded from http://pubs.acs.org on December 8, 2018
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ACS Sensors
Label-free bacteria quantification in blood plasma by a bioprinted microarray based interferometric point-of-care device Priyanka Dey1, Nuria Fabri-Faja1, Olalla Calvo-Lozano1, Roland A. Terborg2, Alexander Belushkin3, Filiz Yesilkoy3, Anna Fàbrega4, Juan Carlos Ruiz-Rodriguez5, Ricard Ferrer5, Juan José GonzálezLópez4, Maria Carmen Estévez1*, Hatice Altug3, Valerio Pruneri2,6and Laura M. Lechuga1 1) Nanobiosensors and Bioanalytical Applications Group, Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC, CIBER-BBN and BIST, Campus UAB, 08193 Bellaterra (Barcelona), Spain. 2) ICFO—Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels (Barcelona), Spain. 3) Institute of Bioengineering, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015, Switzerland. 4) Hospital Universitari Vall d’Hebron. Universitat Autònoma de Barcelona (Barcelona), Spain. 5) Intensive Care Department. Vall d’Hebron University Hospital. Shock, Organ Dysfuction and Resuscitation Research Group. Vall d’Hebron Institute of Research. Barcelona. Spain 6) ICREA—Institució Catalana de Recerca i Estudis Avançats, 08010 Barcelona, Spain.
*Corresponding author: M.-Carmen Estevez:
[email protected] Keywords: bacteria, sepsis, microarray, label-free detection; nanoplasmonics, plasma samples Abstract Existing clinical methods for bacteria detection lack in speed, sensitivity and importantly in Point-ofCare (PoC) applicability. Thus, finding ways to push the sensitivity of clinical PoC biosensing technologies is crucial. Aiming that, we here report a portable PoC device based on Lens-free Interferometric Microscopy (LIM). The device employs high performance nanoplasmonics and custom bioprinted microarrays and is capable of direct label-free bacteria (E. coli) quantification. With only one-step sample handling we offer a sampletodata turnaround time of 40 minutes. Our technology features detection sensitivity of a single bacterial cell both in buffer and diluted blood plasma and is intrinsically limited by the number of cells present in the detection volume. When employed in a hospital setting, the device has enabled accurate categorization of sepsis patients (infectious SIRS) from control groups (healthy individuals and non-infectious SIRS patients) without false positives/negatives. User-friendly on-site bacterial clinical diagnosis can thus become a reality.
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Fast spreading bacterial infections induce acute infections, critical illnesses as meningitis, as well as life-threatening conditions as sepsis.1,2 In particular, sepsis with a mortality rate of 30%3–7 requires fast and accurate diagnosis as the survival chances decreases by 7-8% for every hour that the infection remains untreated.8–10 Rapid, sensitive and quantifiable bacterial detection from patient blood is thus a clinical demand. Blood culture is still the gold standard method used to perform a microbiological diagnosis of sepsis6,11,12, but its slow turnaround times delay the delivery of optimal personalized therapy. Furthermore, its low sensitivity results in a positive detection of the pathogen in approximately only 50% of cases. False-negative results can also be the consequence of presence of antibiotics in blood or the inability of the bacteria to grow under the laboratory culture conditions.13 Recently, molecular diagnostic tests requiring a polymerase chain reaction (PCR) amplification step is becoming popular. Although they are labour-intensive, they have improved the sensitivity in addition to reducing the processing time to 38 h4,8,14, but is still not optimal for sepsis treatments. Outdoor or post-operative patients suspected of bacterial infections need rapid diagnosis and categorization15 into bacteraemia, sepsis or non-infectious SIRS i.e, Systemic Inflammatory Response Syndrome (a non-infectious process exhibiting similar symptoms to that of sepsis and hence requiring different treatments). Appropriate treatment would thus be possible with sensitive accurate and fast (
