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Enhancing the performance of porous silicon biosensors:the interplay of nanostructure design and microfluidic integration

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Microsystems & Nanoengineering 2024年第4期10卷 211-224页

作者： kayan awawdeh Marc AButtkewitz Janina Bahnemann Ester Segal Faculty of Biotechnology and Food Engineering Technion—Israel Institute of Technology320003 HaifaIsrael Institute of Technical Chemistry Leibniz Universität Hannover30167 HannoverGermany Institute of Physics University of Augsburg86159 AugsburgGermany Centre for Advanced Analytics and Predictive Sciences(CAAPS) University of Augsburg86159 AugsburgGermany

This work presents the development and design of aptasensor employing porous silicon(PSi)Fabry‒Pérot thin films that are suitable for use as optical transducers for the detection of lactoferrin(LF),which is a protein biomarker secreted at elevated levels during gastrointestinal(GI)inflammatory disorders such as inflammatory bowel disease and chronic *** overcome the primary limitation associated with PSi biosensors—namely,their relatively poor sensitivity due to issues related to complex mass transfer phenomena and reaction kinetics—we employed two strategic approaches:First,we sought to optimize the porous nanostructure with respect to factors including layer thickness,pore diameter,and capture probe ***,we leveraged convection properties by integrating the resulting biosensor into a 3D-printed microfluidic system that also had one of two different micromixer architectures(i.e.,staggered herringbone micromixers or microimpellers)*** demonstrated that tailoring the PSi aptasensor significantly improved its performance,achieving a limit of detection(LOD)of 50 nM—which is>1 order of magnitude lower than that achieved using previously-developed biosensors of this ***,integration into microfluidic systems that incorporated passive and active micromixers further enhanced the aptasensor’s sensitivity,achieving an additional reduction in the LOD by yet another order of *** advancements demonstrate the potential of combining PSi-based optical transducers with microfluidic technology to create sensitive label-free biosensing platforms for the detection of GI inflammatory biomarkers.

关键词： porous integration fluid

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