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Multiplexed Nanobiosensors: Current Trends in Early Diagnostics

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Multiplexed Nanobiosensors: Current Trends in Early Diagnostics ( multiplexed-nanobiosensors-current-trends-early-diagnostics )

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Sensors 2020, 20, 6890 2 of 23 Sensors 2020, 20, x FOR PEER REVIEW 2 of 23 abdiodmitiaornkaelrsadquvanlitagtievseltyoothriqsuaapnptritoaatcivhe,lsyuicnhaasinmgoleresadmatpalpe.oTinhtesrferoamre saidndgilteiosnaamlpadlevsa,nretadguecsedtoctohsits paeprpdroaatachp,osiunct,hfeaws emroererodrastdaupeotiontfsewfroermsasminpgless,amndpliensc,rreeadseudcetdhrcoousgthppeurtd(aFtiaguproein1t),.fCeownevreerrsreolyrs, cdruoesst-orefaecwtievritsyarmemplaeisn,saandsigincirfiecasnetdcthharloleunghep.uIfta(nFtiigbuordeie1s).cCanonovtedrsisetliyn,gcuroishs-breatwcteiveintythremanaainlystea asnigdnoifithcaerntstcrhuacltluernaglley. sIifmainlatribcodmiepsocnaenntso,tthdeisstpinegcuifischitybeotfwimeemnutnhoeraeancatliyvtietyadnrdasottihcaelrlystdruecrteuarsaellsy, asnimdilasrcaocmopnosenqeunetsn,cteh,emspueltciipfilceixtyedofdiemtemctuionnormeaacytivniotytdwroasrtkicpalrloypdeerlcyreiansecso,manpdleaxsbaicoolongsiecqauleanncde, cmliuniltciapllseaxmedpdleest.ection may not work properly in complex biological and clinical samples. Figure 1. Differences between traditional and multiplexed diagnostics. Figure 1. Differences between traditional and multiplexed diagnostics. Through advances in nanomedicine, as well as progress in areas such as nanoelectronics, Through advances in nanomedicine, as well as progress in areas such as nanoelectronics, nanomaterials, and optics, there has been a steady evolution in the development of miniaturised nanomaterials, and optics, there has been a steady evolution in the development of miniaturised nanobiosensors for performing biological analysis based on a variety of multiplexing technologies. nanobiosensors for performing biological analysis based on a variety of multiplexing technologies. Nanobiosensors are sensors in which various nanosize materials are used, however, large equipment Nanobiosensors are sensors in which various nanosize materials are used, however, large equipment is still required for whole sensing systems, because they are not, by themselves, able to detect is still required for whole sensing systems, because they are not, by themselves, able to detect nanoscale events. The current state-of-the-art nanobiosensors are based on several diagnostic methods, nanoscale events. The current state-of-the-art nanobiosensors are based on several diagnostic such as enzyme-linked immunosorbent assay (ELISA), flow cytometric immunoassay, electrochemical methods, such as enzyme-linked immunosorbent assay (ELISA), flow cytometric immunoassay, (amperometric, voltammetric and impedance), immunoassay, mass spectrometric immunoassay, electrochemical (amperometric, voltammetric and impedance), immunoassay, mass spectrometric chromatographic immunoassay, and different optical immunoassays. Contemporary multiplexed immunoassay, chromatographic immunoassay, and different optical immunoassays. Contemporary nanobiosensors are developed for the detection and quantification of clinically relevant analytes in multiplexed nanobiosensors are developed for the detection and quantification of clinically relevant biological and clinical samples (i.e., blood, urine, and saliva). analytes in biological and clinical samples (i.e., blood, urine, and saliva). However, in order to successfully implement multiplexed biosensing systems, several crucial However, in order to successfully implement multiplexed biosensing systems, several crucial elements are required [4,5]. The two key steps in any immunoassay are efficient capture and specific elements are required [4,5]. The two key steps in any immunoassay are efficient capture and specific detection. Firstly, recognition probes (e.g., antibodies and other biomolecules), that can interact detection. Firstly, recognition probes (e.g., antibodies and other biomolecules), that can interact with with specific analyte are required. Specific antibodies can recognize analytes, however for the specific analyte are required. Specific antibodies can recognize analytes, however for the detection of detection of immunoreactivity, additional elements are needed. Thus, a second and crucial factor is immunoreactivity, additional elements are needed. Thus, a second and crucial factor is required— required—the detection probe. For this purpose, stable optical markers or labels that can provide the the detection probe. For this purpose, stable optical markers or labels that can provide the signal signal contrast in the final imaging process can be used. These probes with bio-functional groups contrast in the final imaging process can be used. These probes with bio-functional groups provide provide optical signals to confirm and quantify the specific analytes. The last element is a readout optical signals to confirm and quantify the specific analytes. The last element is a readout system, system, which can evaluate and quantify detection probes, thus providing information about specific which can evaluate and quantify detection probes, thus providing information about specific analytes. Signals for readout are usually based on fluorescence parameters such as wavelength, intensity, analytes. Signals for readout are usually based on fluorescence parameters such as wavelength, and lifetime. Although a variety of different fluorescent dyes and fluorophores have been used as intensity, and lifetime. Although a variety of different fluorescent dyes and fluorophores have been detection probes in various immunoassays, only a few fluorescent probes are capable of monitoring used as detection probes in various immunoassays, only a few fluorescent probes are capable of multiple analytes in bioassays with distinct optical signals. Compared to fluorescent dyes, nanoparticles monitoring multiple analytes in bioassays with distinct optical signals. Compared to fluorescent are stable, bright fluorophores with high fluorescence quantum yields, narrow fluorescence emission dyes, nanoparticles are stable, bright fluorophores with high fluorescence quantum yields, narrow bands (quantum dots and upconverting nanoparticles), larger Stokes shift, long fluorescence lifetimes, fluorescence emission bands (quantum dots and upconverting nanoparticles), larger Stokes shift, long fluorescence lifetimes, high resistance to photobleaching, and can provide excitation of several

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