Procedia Technology最新文献

In this work, a CRP detection by Aptasensor based on LMR is presented. A thin film of Tin Dioxide (SnO₂) has been used as LMR generator, and the CRP Aptamer has blind onto the optical fiber to perform the measures.

Biosensors are widely used as analytical devices for determination of medically relevant parameters, e.g. glucose, lactate and histamine. The possibility of easily available and low-cost sensors is a central need in mobile diagnostics and personal health monitoring. Therefore, biosensors combined with near field communication (NFC) technology enable simple and smart sensor solutions for electrical and non-electrical parameter measurements.

This work focuses on the development of optical sensors based on the LSPR phenomenon in nano-structured gold films suitable for detection of mycotoxins. A simple technology of annealing thin gold films was utilized for the formation of gold nano-islands exhibiting the LSPR effect. The morphology of gold nano-structures produced was studied with SEM and AFM while their optical properties were analysed with UV-vis absorption spectroscopy and spectroscopic ellipsometry (SE). A blue spectral shift of LSPR band caused by changes in the refractive index of medium constitutes the main principle of LSPR sensing. Bio-sensing tests were attempted using SE in total internal reflection mode (TIRE); a noticeable spectral shift was recorded on course of immune binding of aflatoxin B1 to specific antibodies immobilized on the surface of gold.

Resistive pulse sensors, RPS, are allowing the transport mechanism of molecules, proteins and even nanoparticles to be characterized as they traverse small channels. Here we present our recent advancement of the technique identifying key experimental designs for potential POC assays. The first assay utilized superparamagnetic beads, if the surfaces of the beads are modified with an aptamer, the frequency of beads (translocations/minute) through the pore can be related to the concentration of specific proteins in the solution. Herein, we have demonstrated the successful use of TRPS to observe the binding of two proteins, to their specific aptamers simultaneously. We then adapt the measurement strategy and demonstrate that the translocation times of particles can be used to infer the zeta potential to measure the change in zeta potential of DNA modified particles. By measuring the translocation times of DNA modified nanoparticles as a function of packing density, length, structure, and hybridisation time, we observe a clear difference in zeta potential using both mean values, and population distributions as a function of the DNA structure. Finally we present the first comparison between assays that use resistive pulses or rectification ratios on a tunable pore platform.

In this study, a MEMS-based microfluidic device combining DEP-based cell manipulation with size-based filtration for the enrichment of CTCs from blood with high-throughput was developed. Positive-DEP (pDEP) force and the hydrodynamic force have been used to fine-tune the cell movement over the planar electrodes (sliding) at a high flow rate (30 μl/min). While smaller sized RBCs passed through the gaps and were directed to the waste channels, cancer cells (K562 cells) were filtered and directed to the cancer cell outlet. A cell enrichment factor and depletion rate of RBCs were calculated as 1.45 and 60%, respectively.

Modern threats of bioterrorism force the need to immediately identify biothreat agents. Here, we present an electrochemical detection platform for identification of six biothreat agents in parallel within approx. 20 minutes in an automated procedure. The detection platform is permanently housed in a robust, lightweight suitcase offering a fully deconable housing. Limits of detection are in the range of 10³ - 10⁵ colony forming units per mL or 10⁴ - 10⁵ plaque forming units per mL for bacterial or viral agents, respectively. These results demonstrate the potential of electrochemical biochips for parallel and sensitive on-site detection of biothreat agents.