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Nanoimmunosensor

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Biosensors".

Deadline for manuscript submissions: closed (31 August 2020) | Viewed by 28792

Special Issue Editors


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Guest Editor
Department of Science and Technology (ITN), Campus Norrköping, Linköping University, SE 60174 Norrköping, Sweden
Interests: materials; synthesis; characterization; material application for energy harvesting; devices for sensing; optical and electrical devices
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Guest Editor
Beijing Advanced Innovation Centre for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, China
Interests: nanoscience and technology

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Guest Editor
Birla Institute of Technology and Science, Pilani, Pilani, India
Interests: analytical and bio-analytical chemistry, biosensors, Bio-MEMS, Biochips, microfluidics for chemical and biological analysis, metal speciation, high throughput screening, pesticide residue analysis, aflatoxin detection, antibiotic analysis, milk, water and waste wate analysis, thermal, optical and piezoelectric biosensors, Electrochemical Impedance spectroscopy, enzyme and immunosensors, multianalyte analysis, field portable devices & kits

Special Issue Information

Dear Colleagues,

The synergistic integration of nanomaterials with biosensors has shown tremendous potential with respect to the development of smart devices with wide applications, ranging from chemical sensors to analytical tools for rapid diagnosis and therapeutics.

The unique tunable properties of nanomaterials with easy surface modification provide myriad opportunities for tuning and improving biodevices to achieve desired performance. Particularly, in the case of biosensors, the convenience of surface alterations for easy integration of biorecognition elements onto transducer surfaces broadens the sensing capability of such devices to precisely detect distinctive target biological and chemical species. Needless to say, nanomaterials coupled with surface engineering constitute a powerful toolbox that is capable of designing advanced nanotransducers to meet specific requirements. Nanoimmunosensors, which are basically biosensors that can detect a target species based on antigen–antibody interactions, have undergone tremendous upgrading in terms of signal sensitivity and analytical reliability. Nanotransducers can either directly or indirectly measure on-going immunochemical reactions, producing a proportionate response that can be recorded by electrochemical or optical detection techniques. In the indirect approach, an immune complex is first formed by labeling antibodies or antigens on the transducer’s surface. This immune complex can have different configurations, such as sandwich, competition, and capture configurations, where optical measurements (absorbance, fluorescence, and chemiluminescence) are most often considered for signal detection. On the other hand, in the case of direct detection, which is a label-free protocol, the binding event between the antibody and antigen is registered based on the change or variation in the physicochemical behavior of the transducing material, i.e., resistance change or optical change that can be measured using electrochemical impedance spectroscopy, electrochemical redox chemistry, and surface plasmon resonance (SPR).

Increasing clinical challenges, along with bottleneck issues such as the need to produce nanotransducers that can support greater immobilization while producing a high-throughput detection signal, have initiated a constant search for high-performance immunosensing devices. To achieve this, integrated technologies involving electrochemistry, photochemistry, nanotechnology, and surface engineering are showing tremendous potential while enabling immunosensors to be used in new applications, such as in environmental analysis and the pharmaceuticals, food, and biosecurity industries.

In this Special Issue of Nanoimmunosensor, we seek to bring together researchers from various areas of science working on integrated technologies for the development and engineering of novel, versatile immunosensing platforms with potential applications in, but not limited to, clinical analysis, therapeutics, and pharmaceuticals. This Special Issue will showcase the most recent advances and highly interdisciplinary approaches covering both material engineering and detection aspects of nanoimmunosensors with the goal of highlighting their widening applications in different fields, presenting challenges to their use, and exploring future research directions.

Prof. Dr. Magnus Willander
Dr. Razium Ali Soomro
Prof. Dr. Sunil Bhand
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Sensors is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Immunosensor
  • Nanoelectrochemical sensors
  • Bio-active sensors
  • Photoimmunosensors
  • Photoelectrochemical immunoassay

Published Papers (4 papers)

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Research

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14 pages, 26033 KiB  
Article
Affimer-Based Europium Chelates Allow Sensitive Optical Biosensing in a Range of Human Disease Biomarkers
by Eiman Al-Enezi, Alexandre Vakurov, Amy Eades, Mingyu Ding, Gin Jose, Sikha Saha and Paul Millner
Sensors 2021, 21(3), 831; https://doi.org/10.3390/s21030831 - 27 Jan 2021
Cited by 9 | Viewed by 3992
Abstract
The protein biomarker measurement has been well-established using ELISA (enzyme-linked immunosorbent assay), which offers good sensitivity and specificity, but remains slow and expensive. Certain clinical conditions, where rapid measurement or immediate confirmation of a biomarker is paramount for treatment, necessitate more rapid analysis. [...] Read more.
The protein biomarker measurement has been well-established using ELISA (enzyme-linked immunosorbent assay), which offers good sensitivity and specificity, but remains slow and expensive. Certain clinical conditions, where rapid measurement or immediate confirmation of a biomarker is paramount for treatment, necessitate more rapid analysis. Biosensors offer the prospect of reagent-less, processing-free measurements at the patient’s bedside. Here, we report a platform for biosensing based on chelated Eu3+ against a range of proteins including biomarkers of cardiac injury (human myoglobin), stroke (glial fibrillary acidic protein (GFAP)), inflammation (C-reactive protein (CRP)) and colorectal cancer (carcinoembryonic antigen (CEA)). The Eu3+ ions are chelated by modified synthetic binding proteins (Affimers), which offer an alternative targeting strategy to existing antibodies. The fluorescence characteristics of the Eu3+ complex with modified Affimers against human myoglobin, GFAP, CRP and CEA were measured in human serum using λex = 395 nm, λem = 590 and 615 nm. The Eu3+-Affimer based complex allowed sensitive detection of human myoglobin, GFAP, CRP and CEA proteins as low as 100 fM in (100-fold) diluted human serum samples. The unique dependence on Eu3+ fluorescence in the visible region (590 and 615 nm) was exploited in this study to allow rapid measurement of the analyte concentration, with measurements in 2 to 3 min. These data demonstrate that the Affimer based Eu3+ complexes can function as nanobiosensors with potential analytical and diagnostic applications. Full article
(This article belongs to the Special Issue Nanoimmunosensor)
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10 pages, 2541 KiB  
Article
In Situ Growth of CuWO4 Nanospheres over Graphene Oxide for Photoelectrochemical (PEC) Immunosensing of Clinical Biomarker
by Zaheer Abbas, Razium Ali Soomro, Nazar Hussain Kalwar, Mawada Tunesi, Magnus Willander, Selcan Karakuş and Ayben Kilislioğlu
Sensors 2020, 20(1), 148; https://doi.org/10.3390/s20010148 - 25 Dec 2019
Cited by 13 | Viewed by 3741
Abstract
Procalcitonin (PCT) protein has recently been identified as a clinical marker for bacterial infections based on its better sepsis sensitivity. Thus, an increased level of PCT could be linked with disease diagnosis and therapeutics. In this study, we describe the construction of the [...] Read more.
Procalcitonin (PCT) protein has recently been identified as a clinical marker for bacterial infections based on its better sepsis sensitivity. Thus, an increased level of PCT could be linked with disease diagnosis and therapeutics. In this study, we describe the construction of the photoelectrochemical (PEC) PCT immunosensing platform based on it situ grown photo-active CuWO4 nanospheres over reduced graphene oxide layers (CuWO4@rGO). The in situ growth strategy enabled the formation of small nanospheres (diameter of 200 nm), primarily composed of tiny self-assembled CuWO4 nanoparticles (2–5 nm). The synergic coupling of CuWO4 with rGO layers constructed an excellent photo-active heterojunction for photoelectrochemical (PEC) sensing. The platform was then considered for electrocatalytic (EC) mechanism-based detection of PCT, where inhibition of the photocatalytic oxidation signal of ascorbic acid (AA), subsequent to the antibody–antigen interaction, was recorded as the primary signal response. This inhibition detection approach enabled sensitive detection of PCT in a concentration range of 10 pg·mL−1 to 50 ng.mL−1 with signal sensitivity achievable up to 0.15 pg·mL−1. The proposed PEC hybrid (CuWO4@rGO) could further be engineered to detect other clinically important species. Full article
(This article belongs to the Special Issue Nanoimmunosensor)
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Review

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15 pages, 4298 KiB  
Review
Antibody-Electroactive Probe Conjugates Based Electrochemical Immunosensors
by Mateusz Kondzior and Iwona Grabowska
Sensors 2020, 20(7), 2014; https://doi.org/10.3390/s20072014 - 03 Apr 2020
Cited by 28 | Viewed by 4853
Abstract
Suitable immobilization of a biorecognition element, such as an antigen or antibody, on a transducer surface is essential for development of sensitive and analytically reliable immunosensors. In this review, we report on (1) methods of antibody prefunctionalization using electroactive probes, (2) methods for [...] Read more.
Suitable immobilization of a biorecognition element, such as an antigen or antibody, on a transducer surface is essential for development of sensitive and analytically reliable immunosensors. In this review, we report on (1) methods of antibody prefunctionalization using electroactive probes, (2) methods for immobilization of such conjugates on the surfaces of electrodes in electrochemical immunosensor construction and (3) the use of antibody-electroactive probe conjugates as bioreceptors and sensor signal generators. We focus on different strategies of antibody functionalization using the redox active probes ferrocene (Fc), anthraquinone (AQ), thionine (Thi), cobalt(III) bipyridine (Co(bpy)33+), Ru(bpy)32+ and horseradish peroxidase (HRP). In addition, new possibilities for antibody functionalization based on bioconjugation techniques are presented. We discuss strategies of specific, quantitative antigen detection based on (i) a sandwich format and (ii) a direct signal generation scheme. Further, the integration of different nanomaterials in the construction of these immunosensors is presented. Lastly, we report the use of a redox probe strategy in multiplexed analyte detection. Full article
(This article belongs to the Special Issue Nanoimmunosensor)
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71 pages, 15226 KiB  
Review
Applications of Graphene Quantum Dots in Biomedical Sensors
by Bhargav D. Mansuriya and Zeynep Altintas
Sensors 2020, 20(4), 1072; https://doi.org/10.3390/s20041072 - 16 Feb 2020
Cited by 148 | Viewed by 15139
Abstract
Due to the proliferative cancer rates, cardiovascular diseases, neurodegenerative disorders, autoimmune diseases and a plethora of infections across the globe, it is essential to introduce strategies that can rapidly and specifically detect the ultralow concentrations of relevant biomarkers, pathogens, toxins and pharmaceuticals in [...] Read more.
Due to the proliferative cancer rates, cardiovascular diseases, neurodegenerative disorders, autoimmune diseases and a plethora of infections across the globe, it is essential to introduce strategies that can rapidly and specifically detect the ultralow concentrations of relevant biomarkers, pathogens, toxins and pharmaceuticals in biological matrices. Considering these pathophysiologies, various research works have become necessary to fabricate biosensors for their early diagnosis and treatment, using nanomaterials like quantum dots (QDs). These nanomaterials effectively ameliorate the sensor performance with respect to their reproducibility, selectivity as well as sensitivity. In particular, graphene quantum dots (GQDs), which are ideally graphene fragments of nanometer size, constitute discrete features such as acting as attractive fluorophores and excellent electro-catalysts owing to their photo-stability, water-solubility, biocompatibility, non-toxicity and lucrativeness that make them favorable candidates for a wide range of novel biomedical applications. Herein, we reviewed about 300 biomedical studies reported over the last five years which entail the state of art as well as some pioneering ideas with respect to the prominent role of GQDs, especially in the development of optical, electrochemical and photoelectrochemical biosensors. Additionally, we outline the ideal properties of GQDs, their eclectic methods of synthesis, and the general principle behind several biosensing techniques. Full article
(This article belongs to the Special Issue Nanoimmunosensor)
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