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Shen Y, Sun Z, Zhao S, Chen F, Shi P, Zhao N, Sun K, Ye C, Lin C, Fu L. Screen-Printed Electrodes as Low-Cost Sensors for Breast Cancer Biomarker Detection. SENSORS (BASEL, SWITZERLAND) 2024; 24:5679. [PMID: 39275589 PMCID: PMC11398123 DOI: 10.3390/s24175679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2024] [Revised: 08/29/2024] [Accepted: 08/30/2024] [Indexed: 09/16/2024]
Abstract
This review explores the emerging role of screen-printed electrodes (SPEs) in the detection of breast cancer biomarkers. We discuss the fundamental principles and fabrication techniques of SPEs, highlighting their adaptability and cost-effectiveness. The review examines various modification strategies, including nanomaterial incorporation, polymer coatings, and biomolecule immobilization, which enhance sensor performance. We analyze the application of SPEs in detecting protein, genetic, and metabolite biomarkers associated with breast cancer, presenting recent advancements and innovative approaches. The integration of SPEs with microfluidic systems and their potential in wearable devices for continuous monitoring are explored. While emphasizing the promising aspects of SPE-based biosensors, we also address current challenges in sensitivity, specificity, and real-world applicability. The review concludes by discussing future perspectives, including the potential for early screening and therapy monitoring, and the steps required for clinical implementation. This comprehensive overview aims to stimulate further research and development in SPE-based biosensors for improved breast cancer management.
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Grants
- 52272053, 52075527, 52102055 National Natural Science Foundation of China
- 2022YFA1203100, 2022YFB3706602, 2021YFB3701801 National Key R&D Program of China
- 2021Z120, 2021Z115, 2022Z084, 2022Z191 Ningbo Key Scientific and Technological Project
- 2021A-037-C, 2021A-108-G the Yongjiang Talent Introduction Programme of Ningbo
- JCPYJ-22030 the Youth Fund of Chinese Academy of Sciences
- 2020M681965, 2022M713243 China Postdoctoral Science Foundation
- 2020301 CAS Youth Innovation Promotion Association
- 2021ZDYF020196, 2021ZDYF020198 Science and Technology Major Project of Ningbo
- XDA22020602, ZDKYYQ2020001 the Project of Chinese Academy of Science
- 2019A-18-C Ningbo 3315 Innovation Team
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Affiliation(s)
- Yin Shen
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
| | - Zhuang Sun
- Qianwan Institute, Ningbo Institute of Materials Technology and Engineering (NIMTE), Chinese Academy of Sciences, Ningbo 315201, China
| | - Shichao Zhao
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
| | - Fei Chen
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
| | - Peizheng Shi
- Qianwan Institute, Ningbo Institute of Materials Technology and Engineering (NIMTE), Chinese Academy of Sciences, Ningbo 315201, China
| | - Ningbin Zhao
- Qianwan Institute, Ningbo Institute of Materials Technology and Engineering (NIMTE), Chinese Academy of Sciences, Ningbo 315201, China
| | - Kaiqiang Sun
- Qianwan Institute, Ningbo Institute of Materials Technology and Engineering (NIMTE), Chinese Academy of Sciences, Ningbo 315201, China
| | - Chen Ye
- Qianwan Institute, Ningbo Institute of Materials Technology and Engineering (NIMTE), Chinese Academy of Sciences, Ningbo 315201, China
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering (NIMTE), Chinese Academy of Sciences, Ningbo 315201, China
- University of Chinese Academy of Sciences, 19 A Yuquan Rd., Shijingshan District, Beijing 100049, China
| | - Chengte Lin
- Qianwan Institute, Ningbo Institute of Materials Technology and Engineering (NIMTE), Chinese Academy of Sciences, Ningbo 315201, China
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering (NIMTE), Chinese Academy of Sciences, Ningbo 315201, China
- University of Chinese Academy of Sciences, 19 A Yuquan Rd., Shijingshan District, Beijing 100049, China
| | - Li Fu
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
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Mukherjee S, Mukherjee A, Bytesnikova Z, Ashrafi AM, Richtera L, Adam V. 2D graphene-based advanced nanoarchitectonics for electrochemical biosensors: Applications in cancer biomarker detection. Biosens Bioelectron 2024; 250:116050. [PMID: 38301543 DOI: 10.1016/j.bios.2024.116050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Revised: 01/01/2024] [Accepted: 01/17/2024] [Indexed: 02/03/2024]
Abstract
Low-cost, rapid, and easy-to-use biosensors for various cancer biomarkers are of utmost importance in detecting cancer biomarkers for early-stage metastasis control and efficient diagnosis. The molecular complexity of cancer biomarkers is overwhelming, thus, the repeatability and reproducibility of measurements by biosensors are critical factors. Electrochemical biosensors are attractive alternatives in cancer diagnosis due to their low cost, simple operation, and promising analytical figures of merit. Recently graphene-derived nanostructures have been used extensively for the fabrication of electrochemical biosensors because of their unique physicochemical properties, including the high electrical conductivity, adsorption capacity, low cost and ease of mass production, presence of oxygen-containing functional groups that facilitate the bioreceptor immobilization, increased flexibility and mechanical strength, low cellular toxicity. Indeed, these properties make them advantageous compared to other alternatives. However, some drawbacks must be overcome to extend their use, such as poor and uncontrollable deposition on the substrate due to the low dispersity of some graphene materials and irreproducibility of the results because of the differences in various batches of the produced graphene materials. This review has documented the most recently developed strategies for electrochemical sensor fabrication. It differs in the categorization method compared to published works to draw greater attention to the wide opportunities of graphene nanomaterials for biological applications. Limitations and future scopes are discussed to advance the integration of novel technologies such as artificial intelligence, the internet of medical things, and triboelectric nanogenerators to eventually increase efficacy and efficiency.
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Affiliation(s)
- Soumajit Mukherjee
- Department of Chemistry and Biochemistry, Mendel University in Brno, Zemedelska 1, CZ-613 00, Brno, Czech Republic
| | - Atripan Mukherjee
- Department of Chemistry and Biochemistry, Mendel University in Brno, Zemedelska 1, CZ-613 00, Brno, Czech Republic; ELI Beamlines Facility, The Extreme Light Infrastructure ERIC, Za Radnici 835, 252 41, Dolni Breznany, Czech Republic
| | - Zuzana Bytesnikova
- Department of Chemistry and Biochemistry, Mendel University in Brno, Zemedelska 1, CZ-613 00, Brno, Czech Republic
| | - Amir M Ashrafi
- Department of Chemistry and Biochemistry, Mendel University in Brno, Zemedelska 1, CZ-613 00, Brno, Czech Republic
| | - Lukas Richtera
- Department of Chemistry and Biochemistry, Mendel University in Brno, Zemedelska 1, CZ-613 00, Brno, Czech Republic; Central European Institute of Technology, Brno University of Technology, Purkynova 123, CZ-612 00, Brno, Czech Republic
| | - Vojtech Adam
- Department of Chemistry and Biochemistry, Mendel University in Brno, Zemedelska 1, CZ-613 00, Brno, Czech Republic.
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Zalke JB, Narkhede NP, Pandhurnekar CP, Rotake DR, Singh SG. Non-enzymatic glucose detection with screen-printed chemiresistive sensor using green synthesised silver nanoparticle and multi-walled carbon nanotubes-zinc oxide nanofibers. NANOTECHNOLOGY 2023; 35:065502. [PMID: 37918017 DOI: 10.1088/1361-6528/ad090c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Accepted: 11/01/2023] [Indexed: 11/04/2023]
Abstract
Non-enzymatic screen-printed chemiresistive interdigitated electrodes (SPCIE) were designed and fabricated using a low-cost screen-printing method for detection of the glucose. The interdigitated electrodes (IDE) pattern was printed using conductive graphene ink on the glossy surface of the photo paper. The proposed glossy photo paper-based SPCIE are functionalized with multi-walled carbon nanotubes-zinc oxide (MWCNTs-ZnO) nanofibers to create the chemiresistive matrix. Further, to bind these nanofibers with the graphene electrode surface, we have used the green synthesized silver nanoparticles (AgNPs) with banana flower stem fluid (BFSF) as a binder solution. AgNPs with BFSF form the conductive porous natural binder layer (CPNBL). It does not allow to increase the resistivity of the deposited material on graphene electrodes and also keeps the nanofibers intact with paper-based SPCIE. The synthesized material of MWCNT-ZnO nanofibers and green synthesized AgNPs with BFSF as a binder were characterized by Ultraviolet-visible spectroscopy (UV-vis), scanning electron microscope (SEM), x-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FTIR). The amperometric measurements were performed on the proposed SPCIE sensor to detect the glucose sample directly. The innovative paper-based SPCIE glucose sensor exhibits a linear corelation between current measurements and glucose concentration in the range between 45.22μm and 20 mm, with a regression coefficient (R2) of 0.9902 and a lower limit of detection (LoD) of 45.22μm (n= 5). The sensitivity of the developed SPCIE sensor was 2178.57μAmM-1cm-2, and the sensor's response time determined was approximately equal to 18 s. The proposed sensor was also tested for real blood serum sample, and relative standard deviation (RSD) was found equal to 2.95%.
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Affiliation(s)
- Jitendra B Zalke
- Department of Electronics Design Technology, Shri Ramdeobaba College of Engineering and Management, Nagpur, India
| | - N P Narkhede
- Department of Electronics Engineering, Shri Ramdeobaba College of Engineering and Management, Nagpur, India
| | - C P Pandhurnekar
- Department of Chemistry, Shri Ramdeobaba College of Engineering and Management, Nagpur, India
| | - Dinesh R Rotake
- Department of Electrical Engineering, Indian Institute of Technology, Hyderabad, India
| | - Shiv Govind Singh
- Department of Electrical Engineering, Indian Institute of Technology, Hyderabad, India
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Ekwujuru EU, Olatunde AM, Klink MJ, Ssemakalu CC, Chili MM, Peleyeju MG. Electrochemical and Photoelectrochemical Immunosensors for the Detection of Ovarian Cancer Biomarkers. SENSORS (BASEL, SWITZERLAND) 2023; 23:4106. [PMID: 37112447 PMCID: PMC10142013 DOI: 10.3390/s23084106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 03/20/2023] [Accepted: 03/28/2023] [Indexed: 06/19/2023]
Abstract
Photoelectrochemical (PEC) sensing is an emerging technological innovation for monitoring small substances/molecules in biological or non-biological systems. In particular, there has been a surge of interest in developing PEC devices for determining molecules of clinical significance. This is especially the case for molecules that are markers for serious and deadly medical conditions. The increased interest in PEC sensors to monitor such biomarkers can be attributed to the many apparent advantages of the PEC system, including an enhanced measurable signal, high potential for miniaturization, rapid testing, and low cost, amongst others. The growing number of published research reports on the subject calls for a comprehensive review of the various findings. This article is a review of studies on electrochemical (EC) and PEC sensors for ovarian cancer biomarkers in the last seven years (2016-2022). EC sensors were included because PEC is an improved EC; and a comparison of both systems has, expectedly, been carried out in many studies. Specific attention was given to the different markers of ovarian cancer and the EC/PEC sensing platforms developed for their detection/quantification. Relevant articles were sourced from the following databases: Scopus, PubMed Central, Web of Science, Science Direct, Academic Search Complete, EBSCO, CORE, Directory of open Access Journals (DOAJ), Public Library of Science (PLOS), BioMed Central (BMC), Semantic Scholar, Research Gate, SciELO, Wiley Online Library, Elsevier and SpringerLink.
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Affiliation(s)
- Ezinne U. Ekwujuru
- Department of Biotechnology and Chemistry, Vaal University of Technology, Vanderbijlpark 1911, South Africa
| | | | - Michael J. Klink
- Department of Biotechnology and Chemistry, Vaal University of Technology, Vanderbijlpark 1911, South Africa
| | - Cornelius C. Ssemakalu
- Department of Biotechnology and Chemistry, Vaal University of Technology, Vanderbijlpark 1911, South Africa
| | - Muntuwenkosi M. Chili
- Department of Biotechnology and Chemistry, Vaal University of Technology, Vanderbijlpark 1911, South Africa
- Centre for Academic Development, Vaal University of Technology, Vanderbijlpark 1911, South Africa
| | - Moses G. Peleyeju
- Department of Biotechnology and Chemistry, Vaal University of Technology, Vanderbijlpark 1911, South Africa
- Centre for Academic Development, Vaal University of Technology, Vanderbijlpark 1911, South Africa
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5
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Sharifi M, Khalilzadeh B, Bayat F, Isildak I, Tajali H. Application of thermal annealing-assisted gold nanoparticles for ultrasensitive diagnosis of pancreatic cancer using localized surface plasmon resonance. Microchem J 2023. [DOI: 10.1016/j.microc.2023.108698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
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6
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Pérez-Ginés V, Torrente-Rodríguez RM, Pedrero M, Martínez-Bosch N, de Frutos PG, Navarro P, Pingarrón JM, Campuzano S. Electrochemical immunoplatform to help managing pancreatic cancer. J Electroanal Chem (Lausanne) 2023. [DOI: 10.1016/j.jelechem.2023.117312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/13/2023]
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7
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Screen-printed electrochemical sensors for environmental monitoring of heavy metal ion detection. REV CHEM ENG 2022. [DOI: 10.1515/revce-2022-0002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract
Heavy metal ions (HMIs) are known to cause severe damages to the human body and ecological environment. And considering the current alarming situation, it is crucial to develop a rapid, sensitive, robust, economical and convenient method for their detection. Screen printed electrochemical technology contributes greatly to this task, and has achieved global attention. It enabled the mass transmission rate and demonstrated ability to control the chemical nature of the measure media. Besides, the technique offers advantages like linear output, quick response, high selectivity, sensitivity and stability along with low power requirement and high signal-to-noise ratio. Recently, the performance of SPEs has been improved employing the most effective and promising method of the incorporation of different nanomaterials into SPEs. Especially, in electrochemical sensors, the incorporation of nanomaterials has gained extensive attention for HMIs detection as it exhibits outstanding features like broad electrochemical window, large surface area, high conductivity, selectivity and stability. The present review focuses on the recent progress in the field of screen-printed electrochemical sensors for HMIs detection using nanomaterials. Different fabrication methods of SPEs and their utilization for real sample analysis of HMIs using various nanomaterials have been extensively discussed. Additionally, advancement made in this field is also discussed taking help of the recent literature.
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Tan YY, Sun HN, Liu M, Liu A, Li SS. Simple synthesis of PtRu nanoassemblies as signal amplifiers for electrochemical immunoassay of carbohydrate antigen 19-9. Bioelectrochemistry 2022; 148:108263. [PMID: 36162334 DOI: 10.1016/j.bioelechem.2022.108263] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 09/03/2022] [Accepted: 09/08/2022] [Indexed: 11/27/2022]
Abstract
In clinical analysis, carbohydrate antigen 19-9 (CA199) is a gold standard for pancreatic cancer diagnosis. Herein, PtRu nanoassemblies (NAs) were synthesized via a facile one-step solvothermal approach, with the help of octylphenoxypolye thoxyethanol (NP-40) acted as a growth-directing molecule, and triethylene glycol (TEG) worked as a reductant and solvent. During the assembly process of small particles, a large number of voids were formed, which significantly increase the specific surface area of the PtRu NAs exhibiting excellent electrocatalytic performance. Incorporating the PtRu NAs as signal amplifiers for potassium ferrocyanide oxidation into the specific molecular recognition of proteins, a facile signal-enhanced electrochemical (EC) immunosensor was developed. Verified by a series of experiments, the proposed immunosensor presented a wide linear range (10-4-70 U mL-1) and a low detection limit (3.3 × 10-5 U mL-1), accompanied by good reproducibility, selectivity, and stability, which could be applied in human serum samples for the determination of CA199, and was comparable to commercial electrochemiluminescence (ECL) immunoassay. Feasibility of batch fabrication of PtRu NAs makes nanomaterial-based EC immunoassay promising for the determination of similar cancer markers in future.
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Affiliation(s)
- Yuan-Yuan Tan
- Institute for Chemical Biology & Biosensing, and College of Life Sciences, Qingdao University, 308 Ningxia Road, Qingdao 266071, China
| | - He-Nan Sun
- Institute for Chemical Biology & Biosensing, and College of Life Sciences, Qingdao University, 308 Ningxia Road, Qingdao 266071, China
| | - Mingjun Liu
- Department of Clinical Laboratory, The Affiliated Hospital of Qingdao University, 16 Jiangsu Road, Qingdao 266003, China
| | - Aihua Liu
- Institute for Chemical Biology & Biosensing, and College of Life Sciences, Qingdao University, 308 Ningxia Road, Qingdao 266071, China
| | - Shan-Shan Li
- Institute for Chemical Biology & Biosensing, and College of Life Sciences, Qingdao University, 308 Ningxia Road, Qingdao 266071, China.
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Electrochemical Immunoassay for Tumor Marker CA19-9 Detection Based on Self-Assembled Monolayer. Molecules 2022; 27:molecules27144578. [PMID: 35889454 PMCID: PMC9324264 DOI: 10.3390/molecules27144578] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Revised: 07/12/2022] [Accepted: 07/17/2022] [Indexed: 12/10/2022] Open
Abstract
A CA19-9 electrochemical immunosensor was constructed using a hybrid self-assembled membrane modified with a gold electrode and applied to detect real samples. Hybrid self-assembled membranes were selected for electrode modification and used to detect antigens. First, the pretreated working electrodes were placed in a 3-mercaptopropionic acid (MPA)/β-mercaptoethanol (ME) mixture for 24 h for self-assembly. The electrodes were then placed in an EDC/NHS mixture for 1 h. Layer modification was performed by stepwise dropwise addition of CA19-9 antibody, BSA, and antigen. Differential pulse voltammetry was used to characterize this immunosensor preparation process. The assembled electrochemical immunosensor enables linear detection in the concentration range of 0.05–500 U/mL of CA19-9, and the detection limit was calculated as 0.01 U/mL. The results of the specificity measurement test showed that the signal change of the interfering substance was much lower than the response value of the detected antigen, indicating that the sensor has good specificity and strong anti-interference ability. The repeatability test results showed that the relative standard deviations were less than 5%, showing good accuracy and precision. The CA19-9 electrochemical immunosensor was used for the actual sample detection, and the experimental results of the standard serum addition method showed that the RSD values of the test concentrations were all less than 10%. The recoveries were 102.4–115.0%, indicating that the assay has high precision, good accuracy, and high potential application value.
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Kozak J, Tyszczuk-Rotko K, Wójciak M, Sowa I, Rotko M. Electrochemically Pretreated Sensor Based on Screen-Printed Carbon Modified with Pb Nanoparticles for Determination of Testosterone. MATERIALS 2022; 15:ma15144948. [PMID: 35888414 PMCID: PMC9320313 DOI: 10.3390/ma15144948] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 07/12/2022] [Accepted: 07/14/2022] [Indexed: 02/04/2023]
Abstract
Testosterone (TST), despite its good properties, may be harmful to the human organism and the environment. Therefore, monitoring biological fluids and environmental samples is important. An electrochemically pretreated screen-printed carbon sensor modified with Pb nanoparticles (pSPCE/PbNPs) was successfully prepared and used for the determination of TST. The surface morphology and electrochemical properties of unmodified and modified sensors were characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), scanning and transmission electron microscopy (SEM and TEM), and energy-dispersive X-ray spectroscopy (EDS). Selective determinations of TST at the pSPCE/PbNPs were carried out by differential pulse adsorptive stripping voltammetry (DPAdSV, EPb dep.and TST acc. of −1.1 V, t Pb dep.and TST acc. of 120 s, ΔEA of 50 mV, ν of 175 mV s−1, and tm of 5 ms) in a solution containing 0.075 mol L−1 acetate buffer of pH = 4.6 ± 0.1, and 7.5 × 10−5 mol L−1 Pb(NO3)2. The analytical signal obtained at the potential around −1.42 V (vs. silver pseudo-reference electrode) is related to the reduction process of TST adsorbed onto the electrode surface. The use of pSPCE/PbNPs allows obtaining a very low limit of TST detection (2.2 × 10−12 mol L−1) and wide linear ranges of the calibration graph (1.0 × 10−11–1.0 × 10−10, 1.0 × 10−10–2.0 × 10−9, and 2.0 × 10−9–2.0 × 10−8 mol L−1). The pSPCE/PbNPs were successfully applied for the determination of TST in reference material of human urine and wastewater purified in a sewage treatment plant without preliminary preparation.
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Affiliation(s)
- Jędrzej Kozak
- Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Skłodowska University in Lublin, 20-031 Lublin, Poland; (J.K.); (M.R.)
| | - Katarzyna Tyszczuk-Rotko
- Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Skłodowska University in Lublin, 20-031 Lublin, Poland; (J.K.); (M.R.)
- Correspondence:
| | - Magdalena Wójciak
- Department of Analytical Chemistry, Medical University of Lublin, 20-093 Lublin, Poland; (M.W.); (I.S.)
| | - Ireneusz Sowa
- Department of Analytical Chemistry, Medical University of Lublin, 20-093 Lublin, Poland; (M.W.); (I.S.)
| | - Marek Rotko
- Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Skłodowska University in Lublin, 20-031 Lublin, Poland; (J.K.); (M.R.)
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Tyszczuk-Rotko K, Kozak J, Czech B. Screen-Printed Voltammetric Sensors-Tools for Environmental Water Monitoring of Painkillers. SENSORS (BASEL, SWITZERLAND) 2022; 22:s22072437. [PMID: 35408052 PMCID: PMC9003516 DOI: 10.3390/s22072437] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 03/18/2022] [Accepted: 03/20/2022] [Indexed: 05/03/2023]
Abstract
The dynamic production and usage of pharmaceuticals, mainly painkillers, indicates the growing problem of environmental contamination. Therefore, the monitoring of pharmaceutical concentrations in environmental samples, mostly aquatic, is necessary. This article focuses on applying screen-printed voltammetric sensors for the voltammetric determination of painkillers residues, including non-steroidal anti-inflammatory drugs, paracetamol, and tramadol in environmental water samples. The main advantages of these electrodes are simplicity, reliability, portability, small instrumental setups comprising the three electrodes, and modest cost. Moreover, the electroconductivity, catalytic activity, and surface area can be easily improved by modifying the electrode surface with carbon nanomaterials, polymer films, or electrochemical activation.
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12
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Nanotechnology-based approaches for effective detection of tumor markers: A comprehensive state-of-the-art review. Int J Biol Macromol 2022; 195:356-383. [PMID: 34920057 DOI: 10.1016/j.ijbiomac.2021.12.052] [Citation(s) in RCA: 58] [Impact Index Per Article: 29.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 12/07/2021] [Accepted: 12/08/2021] [Indexed: 02/08/2023]
Abstract
As well-appreciated biomarkers, tumor markers have been spotlighted as reliable tools for predicting the behavior of different tumors and helping clinicians ascertain the type of molecular mechanism of tumorigenesis. The sensitivity and specificity of these markers have made them an object of even broader interest for sensitive detection and staging of various cancers. Enzyme-linked immunosorbent assay (ELISA), fluorescence-based, mass-based, and electrochemical-based detections are current techniques for sensing tumor markers. Although some of these techniques provide good selectivity, certain obstacles, including a low sample concentration or difficulty carrying out the measurement, limit their application. With the advent of nanotechnology, many studies have been carried out to synthesize and employ nanomaterials (NMs) in sensing techniques to determine these tumor markers at low concentrations. The fabrication, sensitivity, design, and multiplexing of sensing techniques have been uplifted due to the attractive features of NMs. Various NMs, such as magnetic and metal nanoparticles, up-conversion NPs, carbon nanotubes (CNTs), carbon-based NMs, quantum dots (QDs), and graphene-based nanosensors, hyperbranched polymers, optical nanosensors, piezoelectric biosensors, paper-based biosensors, microfluidic-based lab-on-chip sensors, and hybrid NMs have proven effective in detecting tumor markers with great sensitivity and selectivity. This review summarizes various categories of NMs for detecting these valuable markers, such as prostate-specific antigen (PSA), human carcinoembryonic antigen (CEA), alpha-fetoprotein (AFP), human chorionic gonadotropin (hCG), human epidermal growth factor receptor-2 (HER2), cancer antigen 125 (CA125), cancer antigen 15-3 (CA15-3, MUC1), and cancer antigen 19-9 (CA19-9), and highlights recent nanotechnology-based advancements in detection of these prognostic biomarkers.
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Bondancia TJ, Soares AC, Popolin-Neto M, Gomes NO, Raymundo-Pereira PA, Barud HS, Machado SA, Ribeiro SJ, Melendez ME, Carvalho AL, Reis RM, Paulovich FV, Oliveira ON. Low-cost bacterial nanocellulose-based interdigitated biosensor to detect the p53 cancer biomarker. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2022; 134:112676. [DOI: 10.1016/j.msec.2022.112676] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 01/10/2022] [Accepted: 01/18/2022] [Indexed: 01/29/2023]
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Wang X, Zhang Z, Wu G, Xu C, Wu J, Zhang X, Liu J. Applications of electrochemical biosensors based on functional antibody-modified screen-printed electrodes: a review. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2021; 14:7-16. [PMID: 34877580 DOI: 10.1039/d1ay01570b] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The detection of biomolecular analytes is of great importance in clinical, environmental, and argo-food areas, among which the electrochemical methodology is attracting much attention. In particular, screen-printed electrode (SPE)-based sensing applications have exhibited potential possibility for on-site detection, especially for fast clinical biomarker detection, since they provide a miniaturized but robust and portable electrode detection system. In this context, we focused on the modification of SPE with functional antibodies to improve the electrochemical detection performance in versatile sensing applications, particularly for COVID-19 detection. These antibodies were immobilized onto the electrode surface via various methodologies, through which the powerful potential from the modification of SPE was revealed. Finally, more novel and excellent works on the biomolecular modification of SPE and the prospects of this technology from its state-of-art status to commercialization are previewed and future perspectives in this field are mentioned.
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Affiliation(s)
- Xuyao Wang
- Precision Medicine Center, Beilun People's Hospital, Zhejiang University School of Medicine First Affiliated Hospital Beilun Branch, Ningbo, Zhejiang, 315806, P. R. China.
| | - Zhenqi Zhang
- Precision Medicine Center, Beilun People's Hospital, Zhejiang University School of Medicine First Affiliated Hospital Beilun Branch, Ningbo, Zhejiang, 315806, P. R. China.
| | - Guolin Wu
- Precision Medicine Center, Beilun People's Hospital, Zhejiang University School of Medicine First Affiliated Hospital Beilun Branch, Ningbo, Zhejiang, 315806, P. R. China.
| | - Chunxia Xu
- Precision Medicine Center, Beilun People's Hospital, Zhejiang University School of Medicine First Affiliated Hospital Beilun Branch, Ningbo, Zhejiang, 315806, P. R. China.
| | - Jianping Wu
- Department of Clinical Laboratory, Zhejiang University School of Medicine First Affiliated Hospital, Hangzhou, Zhejiang, 310003, P. R. China
| | - Xingguo Zhang
- Precision Medicine Center, Beilun People's Hospital, Zhejiang University School of Medicine First Affiliated Hospital Beilun Branch, Ningbo, Zhejiang, 315806, P. R. China.
| | - Jian Liu
- Precision Medicine Center, Beilun People's Hospital, Zhejiang University School of Medicine First Affiliated Hospital Beilun Branch, Ningbo, Zhejiang, 315806, P. R. China.
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15
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Peng S, Wang A, Lian Y, Zhang X, Zeng B, Chen Q, Yang H, Li J, Li L, Dan J, Liao J, Zhou S. Smartphone-based molecularly imprinted sensors for rapid detection of thiamethoxam residues and applications. PLoS One 2021; 16:e0258508. [PMID: 34748559 PMCID: PMC8575258 DOI: 10.1371/journal.pone.0258508] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Accepted: 09/28/2021] [Indexed: 11/19/2022] Open
Abstract
In order to achieve rapid detection of thiamethoxam residues in mango, cowpea and water, this study modified the screen printed carbon electrode (SPCE) to make a specific molecular imprinting sensor (Thiamethoxam-MIP/Au/rGO/SPCE) for thiamethoxam. An integrated smartphone platform was also built for thiamethoxam residue analysis. The performance of the complete system was analyzed by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The system was then applied for the rapid determination of thiamethoxam residues in water, mango and cowpea samples. The results showed that the molecular sensor showed good linearity in the range 0.5–3.0 μmol/L of thiamethoxam. The detection limit of thiamethoxam was 0.5 μmol/L. Moreover, the sensor had good reproducibility and anti-interference performance. The average recovery rates of the pesticide residues in water, mango and cowpea samples were in the range of 90–110% with relative standard deviations < 5%. The rapid detection system for thiamethoxam residue constructed in this study was simple, reliable, reproducible and had strong anti-interference. It has broad application prospects in the field detection of thiamethoxam residue, and serves as a valuable reference for the further development of rapid detection technology of pesticide residues in the field of environment and food safety.
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Affiliation(s)
- Sihua Peng
- Sanya Nanfan Research Institute of Hainan University, Hainan, China
- College of Plant Protection, Hainan University, Hainan, China
| | - Aqiang Wang
- Sanya Nanfan Research Institute of Hainan University, Hainan, China
| | - Yuyang Lian
- Sanya Nanfan Research Institute of Hainan University, Hainan, China
| | - Xi Zhang
- Sanya Nanfan Research Institute of Hainan University, Hainan, China
| | - Bei Zeng
- College of Plant Protection, Hainan University, Hainan, China
| | - Qiulin Chen
- Sanya Nanfan Research Institute of Hainan University, Hainan, China
| | - Heming Yang
- Sanya Nanfan Research Institute of Hainan University, Hainan, China
| | - Jinlei Li
- Sanya Nanfan Research Institute of Hainan University, Hainan, China
| | - Limin Li
- Sanya Nanfan Research Institute of Hainan University, Hainan, China
| | - Jianguo Dan
- College of Plant Protection, Hainan University, Hainan, China
- * E-mail: (JD); (JL); (SZ)
| | - Jianjun Liao
- College of Ecology and Environment, Hainan University, Hainan, China
- * E-mail: (JD); (JL); (SZ)
| | - Shihao Zhou
- Sanya Nanfan Research Institute of Hainan University, Hainan, China
- Key Laboratory of Germplasm Resources Biology of Tropical Special Ornamental Plants, College of Forestry, Hainan University, Hainan, China
- * E-mail: (JD); (JL); (SZ)
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16
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Yola ML, Atar N. Carbohydrate antigen 19-9 electrochemical immunosensor based on 1D-MoS2 nanorods/LiNb3O8 and polyoxometalate-incorporated gold nanoparticles. Microchem J 2021. [DOI: 10.1016/j.microc.2021.106643] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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Castro JI, Chaur MN, Llano CHV, Valencia Zapata ME, Mina Hernandez JH, Grande-Tovar CD. Biocompatibility Study of Electrospun Nanocomposite Membranes Based on Chitosan/Polyvinyl Alcohol/Oxidized Carbon Nano-Onions. Molecules 2021; 26:4753. [PMID: 34443341 PMCID: PMC8400231 DOI: 10.3390/molecules26164753] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Revised: 07/29/2021] [Accepted: 08/03/2021] [Indexed: 12/02/2022] Open
Abstract
In recent decades, the number of patients requiring biocompatible and resistant implants that differ from conventional alternatives dramatically increased. Among the most promising are the nanocomposites of biopolymers and nanomaterials, which pretend to combine the biocompatibility of biopolymers with the resistance of nanomaterials. However, few studies have focused on the in vivo study of the biocompatibility of these materials. The electrospinning process is a technique that produces continuous fibers through the action of an electric field imposed on a polymer solution. However, to date, there are no reports of chitosan (CS) and polyvinyl alcohol (PVA) electrospinning with carbon nano-onions (CNO) for in vivo implantations, which could generate a resistant and biocompatible material. In this work, we describe the synthesis by the electrospinning method of four different nanofibrous membranes of chitosan (CS)/(PVA)/oxidized carbon nano-onions (ox-CNO) and the subdermal implantations after 90 days in Wistar rats. The results of the morphology studies demonstrated that the electrospun nanofibers were continuous with narrow diameters (between 102.1 nm ± 12.9 nm and 147.8 nm ± 29.4 nm). The CS amount added was critical for the diameters used and the successful electrospinning procedure, while the ox-CNO amount did not affect the process. The crystallinity index was increased with the ox-CNO introduction (from 0.85% to 12.5%), demonstrating the reinforcing effect of the nanomaterial. Thermal degradation analysis also exhibited reinforcement effects according to the DSC and TGA analysis, with the higher ox-CNO content. The biocompatibility of the nanofibers was comparable with the porcine collagen, as evidenced by the subdermal implantations in biological models. In summary, all the nanofibers were reabsorbed without a severe immune response, indicating the usefulness of the electrospun nanocomposites in biomedical applications.
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Affiliation(s)
- Jorge Iván Castro
- Grupo de Investigación SIMERQO, Departamento de Química, Universidad del Valle, Calle 13 No. 100-00, 76001 Cali, Colombia; (J.I.C.); (M.N.C.)
| | - Manuel N. Chaur
- Grupo de Investigación SIMERQO, Departamento de Química, Universidad del Valle, Calle 13 No. 100-00, 76001 Cali, Colombia; (J.I.C.); (M.N.C.)
| | | | - Mayra Eliana Valencia Zapata
- Grupo de Materiales Compuestos, Escuela de Ingeniería de Materiales, Facultad de Ingeniería, Universidad del Valle, Calle 13 No. 100-00, 760032 Santiago de Cali, Colombia; (M.E.V.Z.); (J.H.M.H.)
| | - José Herminsul Mina Hernandez
- Grupo de Materiales Compuestos, Escuela de Ingeniería de Materiales, Facultad de Ingeniería, Universidad del Valle, Calle 13 No. 100-00, 760032 Santiago de Cali, Colombia; (M.E.V.Z.); (J.H.M.H.)
| | - Carlos David Grande-Tovar
- Grupo de Investigación de Fotoquímica y Fotobiología, Facultad de Ciencias, Universidad del Atlántico, Carrera 30 Número 8-49, 081008 Puerto Colombia, Colombia
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Zhang Y, Zhou N. Electrochemical Biosensors Based on Micro‐fabricated Devices for Point‐of‐Care Testing: A Review. ELECTROANAL 2021. [DOI: 10.1002/elan.202100281] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Yuting Zhang
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology Ministry of Education School of Biotechnology Jiangnan University Wuxi 214122 China
| | - Nandi Zhou
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology Ministry of Education School of Biotechnology Jiangnan University Wuxi 214122 China
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20
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Su CW, Tian JH, Ye JJ, Chang HW, Tsai YC. Construction of a Label-Free Electrochemical Immunosensor Based on Zn-Co-S/Graphene Nanocomposites for Carbohydrate Antigen 19-9 Detection. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:1475. [PMID: 34199490 PMCID: PMC8227124 DOI: 10.3390/nano11061475] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 05/18/2021] [Accepted: 06/01/2021] [Indexed: 12/12/2022]
Abstract
Nanocomposites of the binary transition metal sulfide Zn-Co-S/graphene (Zn-Co-S@G) were synthesized through a one-step hydrothermal method. They may be useful in the construction of an electrochemical immunosensor for carbohydrate antigen 19-9 (CA19-9) detection. Zn-Co-S dot-like nanoparticles uniformly covered the surface of graphene to form an interconnected conductive network, ensuring strong interaction between transition metal sulfide and graphene, which can expose numerous electroactive sites leading to the improvement of the amplified electrochemical signal toward a direct reduction of H2O2. Thus, the construction of an electrochemical immunosensor using Zn-Co-S@G nanocomposites showed outstanding sensing properties for detecting CA19-9. The constructed electrochemical immunosensor exhibited a good linear relationship in the range of 6.3 U·mL-1-300 U·mL-1, with the limit of detection at 0.82 U·mL-1, which makes it a promising candidate for an electrochemical immunosensor.
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Affiliation(s)
- Chia-Wei Su
- Department of Chemical Engineering, National Chung Hsing University, Taichung 402, Taiwan; (C.-W.S.); (J.-H.T.); (J.-J.Y.)
| | - Jia-Hao Tian
- Department of Chemical Engineering, National Chung Hsing University, Taichung 402, Taiwan; (C.-W.S.); (J.-H.T.); (J.-J.Y.)
| | - Jin-Jia Ye
- Department of Chemical Engineering, National Chung Hsing University, Taichung 402, Taiwan; (C.-W.S.); (J.-H.T.); (J.-J.Y.)
| | - Han-Wei Chang
- Department of Chemical Engineering, National United University, Miaoli 36001, Taiwan
| | - Yu-Chen Tsai
- Department of Chemical Engineering, National Chung Hsing University, Taichung 402, Taiwan; (C.-W.S.); (J.-H.T.); (J.-J.Y.)
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21
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Singh G, Kaur H, Sharma A, Singh J, Alajangi HK, Kumar S, Singla N, Kaur IP, Barnwal RP. Carbon Based Nanodots in Early Diagnosis of Cancer. Front Chem 2021; 9:669169. [PMID: 34109155 PMCID: PMC8181141 DOI: 10.3389/fchem.2021.669169] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Accepted: 05/10/2021] [Indexed: 12/20/2022] Open
Abstract
Detection of cancer at an early stage is one of the principal factors associated with successful treatment outcome. However, current diagnostic methods are not capable of making sensitive and robust cancer diagnosis. Nanotechnology based products exhibit unique physical, optical and electrical properties that can be useful in diagnosis. These nanotech-enabled diagnostic representatives have proved to be generally more capable and consistent; as they selectively accumulated in the tumor site due to their miniscule size. This article rotates around the conventional imaging techniques, the use of carbon based nanodots viz Carbon Quantum Dots (CQDs), Graphene Quantum Dots (GQDs), Nanodiamonds, Fullerene, and Carbon Nanotubes that have been synthesized in recent years, along with the discovery of a wide range of biomarkers to identify cancer at early stage. Early detection of cancer using nanoconstructs is anticipated to be a distinct reality in the coming years.
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Affiliation(s)
- Gurpal Singh
- University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh, India
| | - Harinder Kaur
- University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh, India
| | - Akanksha Sharma
- University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh, India
- Department of Biophysics, Panjab University, Chandigarh, India
| | - Joga Singh
- University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh, India
| | | | - Santosh Kumar
- Department of Biotechnology, Panjab University, Chandigarh, India
| | - Neha Singla
- Department of Biophysics, Panjab University, Chandigarh, India
| | - Indu Pal Kaur
- University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh, India
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Mo G, He X, Qin D, Meng S, Wu Y, Deng B. Spatially-resolved dual-potential sandwich electrochemiluminescence immunosensor for the simultaneous determination of carbohydrate antigen 19-9 and carbohydrate antigen 24-2. Biosens Bioelectron 2021; 178:113024. [PMID: 33493898 DOI: 10.1016/j.bios.2021.113024] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 12/01/2020] [Accepted: 01/18/2021] [Indexed: 11/27/2022]
Abstract
A new electrochemiluminescence (ECL) immunosensor based on spatially-resolved dual-potential technology was designed for the simultaneous determination of carbohydrate antigen 19-9 (CA 19-9) and carbohydrate antigen 24-2 (CA 242). Luminol-AgNPs@ZIF-67 was used as the anodic probe, and Pt nanoparticle-functionalized graphitic carbon nitride nanosheets (g-C3N4@PtNPs) were used as the cathodic probe. Two spatially-resolved areas on the dual-disk glassy carbon electrode (DDGCE) were modified with a AuNPs film by electrodeposition to improve the conductivity of the sensing interface. By recording the ECL responses at two different excitation potentials, the linear range for CA 19-9 was determined to be 0.0001-10 U/mL, with a limit of detection of 31 μU/mL. The linear range for CA 242 was 0.0005-10 U/mL, with a limit of detection of 0.16 mU/mL. Moreover, the ECL immunosensor possessed high selectivity and stability and successfully detected CA 19-9 and CA 242 in real samples. This immunosensor provides a new platform for clinical immunoassays.
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Affiliation(s)
- Guichun Mo
- State Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin, 541004, China
| | - Xuanming He
- State Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin, 541004, China
| | - Dongmiao Qin
- State Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin, 541004, China
| | - Shuo Meng
- State Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin, 541004, China
| | - Yusheng Wu
- State Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin, 541004, China
| | - Biyang Deng
- State Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin, 541004, China.
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23
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Hu X, Xia F, Lee J, Li F, Lu X, Zhuo X, Nie G, Ling D. Tailor-Made Nanomaterials for Diagnosis and Therapy of Pancreatic Ductal Adenocarcinoma. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:2002545. [PMID: 33854877 PMCID: PMC8025024 DOI: 10.1002/advs.202002545] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2020] [Revised: 10/25/2020] [Indexed: 05/05/2023]
Abstract
Pancreatic ductal adenocarcinoma (PDAC) is one of the deadliest cancers worldwide due to its aggressiveness and the challenge to early diagnosis and treatment. In recent decades, nanomaterials have received increasing attention for diagnosis and therapy of PDAC. However, these designs are mainly focused on the macroscopic tumor therapeutic effect, while the crucial nano-bio interactions in the heterogeneous microenvironment of PDAC remain poorly understood. As a result, the majority of potent nanomedicines show limited performance in ameliorating PDAC in clinical translation. Therefore, exploiting the unique nature of the PDAC by detecting potential biomarkers together with a deep understanding of nano-bio interactions that occur in the tumor microenvironment is pivotal to the design of PDAC-tailored effective nanomedicine. This review will introduce tailor-made nanomaterials-enabled laboratory tests and advanced noninvasive imaging technologies for early and accurate diagnosis of PDAC. Moreover, the fabrication of a myriad of tailor-made nanomaterials for various PDAC therapeutic modalities will be reviewed. Furthermore, much preferred theranostic multifunctional nanomaterials for imaging-guided therapies of PDAC will be elaborated. Lastly, the prospects of these nanomaterials in terms of clinical translation and potential breakthroughs will be briefly discussed.
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Affiliation(s)
- Xi Hu
- Department of Clinical PharmacyZhejiang Provincial Key Laboratory for Drug Evaluation and Clinical Researchthe First Affiliated HospitalZhejiang University School of MedicineHangzhou310003China
| | - Fan Xia
- Institute of PharmaceuticsZhejiang Province Key Laboratory of Anti‐Cancer Drug ResearchHangzhou Institute of Innovative MedicineCollege of Pharmaceutical SciencesZhejiang UniversityHangzhou310058China
| | - Jiyoung Lee
- Institute of PharmaceuticsZhejiang Province Key Laboratory of Anti‐Cancer Drug ResearchHangzhou Institute of Innovative MedicineCollege of Pharmaceutical SciencesZhejiang UniversityHangzhou310058China
| | - Fangyuan Li
- Institute of PharmaceuticsZhejiang Province Key Laboratory of Anti‐Cancer Drug ResearchHangzhou Institute of Innovative MedicineCollege of Pharmaceutical SciencesZhejiang UniversityHangzhou310058China
- Key Laboratory of Biomedical Engineering of the Ministry of EducationCollege of Biomedical Engineering & Instrument ScienceZhejiang UniversityHangzhou310058China
| | - Xiaoyang Lu
- Department of Clinical PharmacyZhejiang Provincial Key Laboratory for Drug Evaluation and Clinical Researchthe First Affiliated HospitalZhejiang University School of MedicineHangzhou310003China
| | - Xiaozhen Zhuo
- Department of Cardiologythe First Affiliated HospitalXi'an Jiaotong UniversityXi'an710061China
| | - Guangjun Nie
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and NanosafetyCAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyNo.11 Zhongguancun BeiyitiaoBeijing100190China
- GBA Research Innovation Institute for NanotechnologyGuangzhou510700China
| | - Daishun Ling
- Institute of PharmaceuticsZhejiang Province Key Laboratory of Anti‐Cancer Drug ResearchHangzhou Institute of Innovative MedicineCollege of Pharmaceutical SciencesZhejiang UniversityHangzhou310058China
- Key Laboratory of Biomedical Engineering of the Ministry of EducationCollege of Biomedical Engineering & Instrument ScienceZhejiang UniversityHangzhou310058China
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24
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Ranjan P, Parihar A, Jain S, Kumar N, Dhand C, Murali S, Mishra D, Sanghi SK, Chaurasia JP, Srivastava AK, Khan R. Biosensor-based diagnostic approaches for various cellular biomarkers of breast cancer: A comprehensive review. Anal Biochem 2020; 610:113996. [PMID: 33080213 DOI: 10.1016/j.ab.2020.113996] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2020] [Revised: 10/09/2020] [Accepted: 10/13/2020] [Indexed: 02/05/2023]
Affiliation(s)
- Pushpesh Ranjan
- CSIR - Advanced Materials and Processes Research Institute (AMPRI), Hoshangabad Road, Bhopal, 462026, India; Academy of Scientific and Innovative Research (AcSIR), CSIR-AMPRI, Bhopal, 462026, India
| | - Arpana Parihar
- Department of Biochemistry and Genetics, Barkatullah University, Bhopal, Madhya Pradesh, 462026, India
| | - Surbhi Jain
- Department of Biochemistry and Genetics, Barkatullah University, Bhopal, Madhya Pradesh, 462026, India
| | - Neeraj Kumar
- CSIR - Advanced Materials and Processes Research Institute (AMPRI), Hoshangabad Road, Bhopal, 462026, India; Academy of Scientific and Innovative Research (AcSIR), CSIR-AMPRI, Bhopal, 462026, India
| | - Chetna Dhand
- CSIR - Advanced Materials and Processes Research Institute (AMPRI), Hoshangabad Road, Bhopal, 462026, India
| | - S Murali
- CSIR - Advanced Materials and Processes Research Institute (AMPRI), Hoshangabad Road, Bhopal, 462026, India
| | - Deepti Mishra
- CSIR - Advanced Materials and Processes Research Institute (AMPRI), Hoshangabad Road, Bhopal, 462026, India
| | - Sunil K Sanghi
- CSIR - Advanced Materials and Processes Research Institute (AMPRI), Hoshangabad Road, Bhopal, 462026, India
| | - J P Chaurasia
- CSIR - Advanced Materials and Processes Research Institute (AMPRI), Hoshangabad Road, Bhopal, 462026, India
| | - Avanish K Srivastava
- CSIR - Advanced Materials and Processes Research Institute (AMPRI), Hoshangabad Road, Bhopal, 462026, India.
| | - Raju Khan
- CSIR - Advanced Materials and Processes Research Institute (AMPRI), Hoshangabad Road, Bhopal, 462026, India.
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Sensing and Interaction of His-Tagged CA19-9 Antigen with Graphene-Modified Electrodes. CHEMOSENSORS 2020. [DOI: 10.3390/chemosensors8040112] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The electrochemical oxidation of CA19-9 tagged with L-Histidine (CA199-His) was investigated for the first time with screen-printed electrodes (DS) modified with graphene oxide (DS/GO) or thermally reduced graphene oxide (DS/TRGO). Successive cyclic voltammograms (CV) measurements performed with bare and DS/TRGO electrodes proved that the intensity of the oxidation peak (I peak) is time-dependent. In fact, the oxidation signal increased over time, reached a maximum and then decreased due to the saturation of the surface with CA199-His molecules. The interaction of CA199-His with GO, TRGO, or graphite was additionally studied by isothermal calorimetry, a useful tool for accessing information regarding the biomolecule adsorption on graphene surface. The adsorption of CA199-His on TRGO was generating a higher heat, suggesting quantitative and efficient interactions. At the same time, in the case of TRGO, the saturation was not reached, indicating the existence of more free binding sites than in the case of GO and graphite. As such, the carbohydrate marker CA199-His showed a higher affinity for the TRGO surface than for the graphite or GO surfaces. The lack of saturation in the case of TRGO may indicate a continuous structural modification of the antigen when interacting with the graphene surface.
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26
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Immunosensors containing solution blow spun fibers of poly(lactic acid) to detect p53 biomarker. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 115:111120. [DOI: 10.1016/j.msec.2020.111120] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2019] [Revised: 04/22/2020] [Accepted: 05/24/2020] [Indexed: 01/28/2023]
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27
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Silva RR, Raymundo-Pereira PA, Campos AM, Wilson D, Otoni CG, Barud HS, Costa CA, Domeneguetti RR, Balogh DT, Ribeiro SJ, Oliveira Jr. ON. Microbial nanocellulose adherent to human skin used in electrochemical sensors to detect metal ions and biomarkers in sweat. Talanta 2020; 218:121153. [DOI: 10.1016/j.talanta.2020.121153] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Revised: 05/07/2020] [Accepted: 05/09/2020] [Indexed: 02/04/2023]
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Cumba LR, Camisasca A, Giordani S, Forster RJ. Electrochemical Properties of Screen-Printed Carbon Nano-Onion Electrodes. Molecules 2020; 25:molecules25173884. [PMID: 32858929 PMCID: PMC7503887 DOI: 10.3390/molecules25173884] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 08/21/2020] [Accepted: 08/24/2020] [Indexed: 12/11/2022] Open
Abstract
The properties of carbon nano-onions (CNOs) make them attractive electrode materials/additives for the development of low-cost, simple to use and highly sensitive Screen Printed Electrodes (SPEs). Here, we report the development of the first CNO-based ink for the fabrication of low-cost and disposable electrodes, leading to high-performance sensors. Achieving a true dispersion of CNOs is intrinsically challenging and a key aspect of the ink formulation. The screen-printing ink formulation is achieved by carefully selecting and optimising the conductive materials (graphite (GRT) and CNOs), the polymer binder, the organic solvent and the plasticiser. Our CNO/GRT-based screen-printed electrodes consist of an interconnected network of conducting carbon particles with a uniform distribution. Electrochemical studies show a heterogeneous electron transfer rate constant of 1.3 ± 0.7 × 10-3 cm·s-1 and a higher current density than the ferrocene/ferrocenium coupled to a commercial graphite SPEs. In addition, the CNO/GRT SPE can detect dopamine in the concentration range of 10.0-99.9 µM with a limit of detection of 0.92 µM (N = 3). They exhibit a higher analytical sensitivity than the commercial graphite-based SPE, with a 4-fold improvement observed. These results open up the possibility of using high-performing CNO-based SPEs for electrochemical applications including sensors, battery electrodes and electrocatalysis.
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Affiliation(s)
- Loanda R. Cumba
- School of Chemical Sciences, National Centre for Sensor Research, Dublin City University, Dublin 9, Ireland; (A.C.); (R.J.F.)
- Correspondence: (L.R.C.); (S.G.)
| | - Adalberto Camisasca
- School of Chemical Sciences, National Centre for Sensor Research, Dublin City University, Dublin 9, Ireland; (A.C.); (R.J.F.)
| | - Silvia Giordani
- School of Chemical Sciences, National Centre for Sensor Research, Dublin City University, Dublin 9, Ireland; (A.C.); (R.J.F.)
- Correspondence: (L.R.C.); (S.G.)
| | - Robert J. Forster
- School of Chemical Sciences, National Centre for Sensor Research, Dublin City University, Dublin 9, Ireland; (A.C.); (R.J.F.)
- FutureNeuro SFI Research Centre, Dublin, Ireland
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Ibáñez-Redín G, Materon EM, Furuta RHM, Wilson D, do Nascimento GF, Melendez ME, Carvalho AL, Reis RM, Oliveira ON, Gonçalves D. Screen-printed electrodes modified with carbon black and polyelectrolyte films for determination of cancer marker carbohydrate antigen 19-9. Mikrochim Acta 2020; 187:417. [DOI: 10.1007/s00604-020-04404-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Accepted: 06/17/2020] [Indexed: 11/24/2022]
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An Immunosensor for the Detection of ULBP2 Biomarker. MICROMACHINES 2020; 11:mi11060568. [PMID: 32503144 PMCID: PMC7344431 DOI: 10.3390/mi11060568] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 05/29/2020] [Accepted: 06/01/2020] [Indexed: 01/20/2023]
Abstract
Pancreatic cancer (PC) is a global health problem that features a very high mortality rate. The UL16 binding protein 2 (ULBP2) is a new biomarker for PC detection. This study develops a simple, reliable, and inexpensive immunosensor for the detection of the ULBP2 antigen while also investigating the effects of an array configuration of connected sensors and zinc oxide (ZnO) nanoparticles on the immunosensor’s sensitivity. The ULBP2 antibody was immobilized onto the screen-printed carbon electrode (SPCE) surfaces of three different sensors: a simple SPCE (ULBP2-SPCE); an SPCE array, which is a series of identical SPCE connected to each other at different arrangements of rows and columns (ULBP2-SPCE-1x2 and ULBP2-SPCE-1x3); and an SPCE combined with ZnO nanoparticles (ULBP2-ZnO/SPCE). Impedance spectrum measurements for the immunosensors to ULBP2 antigen were conducted and compared. According to the result, the array configurations (ULBP2-SPCE-1x2 and ULBP2-SPCE-1x3) show an improvement of sensitivity compared to the ULBP2-SPCE alone, but the improvement is not as significant as that of the ULBP2-ZnO/SPCE configuration (ULBP2-ZnO/SPCE > ULBP2-SPCE: 18 times larger). The ULBP2-ZnO/SPCE immunosensor has a low limit of detection (1 pg/mL) and a high sensitivity (332.2 Ω/Log(pg/mL)), excellent linearity (R2 = 0.98), good repeatability (coefficients of variation = 5.03%), and is stable in long-term storage (retaining 95% activity after 28 days storage). In an array configuration, the immunosensor has an increased signal-to-noise ratio (ULBP2-SPCE-1x3 > ULBP2-SPCE: 1.5-fold) and sensitivity (ULBP2-SPCE-1x3 > ULBP2-SPCE: 2.6-fold). In conclusion, either the modification with ZnO nanoparticles onto the sensor or the use of an array configuration of sensors can enhance the immunosensor’s sensitivity. In this study, the best immunosensor for detecting ULBP2 antigens is the ULBP2-ZnO/SPCE immunosensor.
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Martins GV, Marques AC, Fortunato E, Sales MGF. Paper-based (bio)sensor for label-free detection of 3-nitrotyrosine in human urine samples using molecular imprinted polymer. SENSING AND BIO-SENSING RESEARCH 2020. [DOI: 10.1016/j.sbsr.2020.100333] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Ahmad R, Khan MA, Srivastava A, Gupta A, Srivastava A, Jafri TR, Siddiqui Z, Chaubey S, Khan T, Srivastava AK. Anticancer Potential of Dietary Natural Products: A Comprehensive Review. Anticancer Agents Med Chem 2020; 20:122-236. [DOI: 10.2174/1871520619666191015103712] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Revised: 06/21/2019] [Accepted: 07/02/2019] [Indexed: 02/07/2023]
Abstract
Nature is a rich source of natural drug-like compounds with minimal side effects. Phytochemicals
better known as “Natural Products” are found abundantly in a number of plants. Since time immemorial, spices
have been widely used in Indian cuisine as flavoring and coloring agents. Most of these spices and condiments
are derived from various biodiversity hotspots in India (which contribute 75% of global spice production) and
form the crux of India’s multidiverse and multicultural cuisine. Apart from their aroma, flavor and taste, these
spices and condiments are known to possess several medicinal properties also. Most of these spices are mentioned
in the Ayurveda, the indigenous system of medicine. The antimicrobial, antioxidant, antiproliferative,
antihypertensive and antidiabetic properties of several of these natural products are well documented in
Ayurveda. These phytoconstituemts are known to act as functional immunoboosters, immunomodulators as well
as anti-inflammatory agents. As anticancer agents, their mechanistic action involves cancer cell death via induction
of apoptosis, necrosis and autophagy. The present review provides a comprehensive and collective update
on the potential of 66 commonly used spices as well as their bioactive constituents as anticancer agents. The
review also provides an in-depth update of all major in vitro, in vivo, clinical and pharmacological studies done
on these spices with special emphasis on the potential of these spices and their bioactive constituents as potential
functional foods for prevention, treatment and management of cancer.
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Affiliation(s)
- Rumana Ahmad
- Department of Biochemistry, Era’s Lucknow Medical College & Hospital, Era University, Sarfarazganj, Lucknow-226003, UP, India
| | - Mohsin A. Khan
- Chancellor, Era University, Sarfarazganj, Hardoi Road, Lucknow-226003, UP, India
| | - A.N. Srivastava
- Department of Pathology, Era’s Lucknow Medical College & Hospital, Era University, Sarfarazganj, Lucknow-226003, UP, India
| | - Anamika Gupta
- Department of Biochemistry, Era’s Lucknow Medical College & Hospital, Era University, Sarfarazganj, Lucknow-226003, UP, India
| | - Aditi Srivastava
- Department of Biochemistry, Era’s Lucknow Medical College & Hospital, Era University, Sarfarazganj, Lucknow-226003, UP, India
| | - Tanvir R. Jafri
- Department of Biochemistry, Era’s Lucknow Medical College & Hospital, Era University, Sarfarazganj, Lucknow-226003, UP, India
| | - Zainab Siddiqui
- Department of Pathology, Era’s Lucknow Medical College & Hospital, Era University, Sarfarazganj, Lucknow-226003, UP, India
| | - Sunaina Chaubey
- Department of Biochemistry, Era’s Lucknow Medical College & Hospital, Era University, Sarfarazganj, Lucknow-226003, UP, India
| | - Tahmeena Khan
- Department of Chemistry, Integral University, Dasauli, P.O. Bas-ha, Kursi Road, Lucknow 226026, UP, India
| | - Arvind K. Srivastava
- Department of Food and Nutrition, Era University, Sarfarazganj, Lucknow-226003, UP, India
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Quinchia J, Echeverri D, Cruz-Pacheco AF, Maldonado ME, Orozco J. Electrochemical Biosensors for Determination of Colorectal Tumor Biomarkers. MICROMACHINES 2020; 11:E411. [PMID: 32295170 PMCID: PMC7231317 DOI: 10.3390/mi11040411] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 03/13/2020] [Accepted: 03/17/2020] [Indexed: 12/15/2022]
Abstract
The accurate determination of specific tumor markers associated with cancer with non-invasive or minimally invasive procedures is the most promising approach to improve the long-term survival of cancer patients and fight against the high incidence and mortality of this disease. Quantification of biomarkers at different stages of the disease can lead to an appropriate and instantaneous therapeutic action. In this context, the determination of biomarkers by electrochemical biosensors is at the forefront of cancer diagnosis research because of their unique features such as their versatility, fast response, accurate quantification, and amenability for multiplexing and miniaturization. In this review, after briefly discussing the relevant aspects and current challenges in the determination of colorectal tumor markers, it will critically summarize the development of electrochemical biosensors to date to this aim, highlighting the enormous potential of these devices to be incorporated into the clinical practice. Finally, it will focus on the remaining challenges and opportunities to bring electrochemical biosensors to the point-of-care testing.
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Affiliation(s)
- Jennifer Quinchia
- Max Planck Tandem Group in Nanobioengineering, University of Antioquia, Complejo Ruta N, Calle 67 No. 52-20, Medellín 050010, Colombia; (J.Q.); (D.E.); (A.F.C.-P.)
| | - Danilo Echeverri
- Max Planck Tandem Group in Nanobioengineering, University of Antioquia, Complejo Ruta N, Calle 67 No. 52-20, Medellín 050010, Colombia; (J.Q.); (D.E.); (A.F.C.-P.)
| | - Andrés Felipe Cruz-Pacheco
- Max Planck Tandem Group in Nanobioengineering, University of Antioquia, Complejo Ruta N, Calle 67 No. 52-20, Medellín 050010, Colombia; (J.Q.); (D.E.); (A.F.C.-P.)
| | - María Elena Maldonado
- Grupo Impacto de los Componentes Alimentarios en la Salud, School of Dietetics and Human Nutrition, University of Antioquia, A.A. 1226, Medellín 050010, Colombia;
| | - Jahir Orozco
- Max Planck Tandem Group in Nanobioengineering, University of Antioquia, Complejo Ruta N, Calle 67 No. 52-20, Medellín 050010, Colombia; (J.Q.); (D.E.); (A.F.C.-P.)
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Pérez-Fernández B, Costa-García A, Muñiz ADLE. Electrochemical (Bio)Sensors for Pesticides Detection Using Screen-Printed Electrodes. BIOSENSORS 2020; 10:E32. [PMID: 32252430 PMCID: PMC7236603 DOI: 10.3390/bios10040032] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Revised: 03/27/2020] [Accepted: 03/30/2020] [Indexed: 12/12/2022]
Abstract
Pesticides are among the most important contaminants in food, leading to important global health problems. While conventional techniques such as high-performance liquid chromatography (HPLC) and mass spectrometry (MS) have traditionally been utilized for the detection of such food contaminants, they are relatively expensive, time-consuming and labor intensive, limiting their use for point-of-care (POC) applications. Electrochemical (bio)sensors are emerging devices meeting such expectations, since they represent reliable, simple, cheap, portable, selective and easy to use analytical tools that can be used outside the laboratories by non-specialized personnel. Screen-printed electrodes (SPEs) stand out from the variety of transducers used in electrochemical (bio)sensing because of their small size, high integration, low cost and ability to measure in few microliters of sample. In this context, in this review article, we summarize and discuss about the use of SPEs as analytical tools in the development of (bio)sensors for pesticides of interest for food control. Finally, aspects related to the analytical performance of the developed (bio)sensors together with prospects for future improvements are discussed.
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Affiliation(s)
| | | | - Alfredo de la Escosura- Muñiz
- NanoBioAnalysis Group-Department of Physical and Analytical Chemistry, University of Oviedo, Julián Clavería 8, 33006 Oviedo, Spain
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Grande Tovar CD, Castro JI, Valencia CH, Navia Porras DP, Herminsul Mina Hernandez J, Valencia Zapata ME, Chaur MN. Nanocomposite Films of Chitosan-Grafted Carbon Nano-Onions for Biomedical Applications. Molecules 2020; 25:E1203. [PMID: 32155970 PMCID: PMC7179466 DOI: 10.3390/molecules25051203] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 02/27/2020] [Accepted: 03/04/2020] [Indexed: 12/18/2022] Open
Abstract
The design of scaffolding from biocompatible and resistant materials such as carbon nanomaterials and biopolymers has become very important, given the high rate of injured patients. Graphene and carbon nanotubes, for example, have been used to improve the physical, mechanical, and biological properties of different materials and devices. In this work, we report the grafting of carbon nano-onions with chitosan (CS-g-CNO) through an amide-type bond. These compounds were blended with chitosan and polyvinyl alcohol composites to produce films for subdermal implantation in Wistar rats. Films with physical mixture between chitosan, polyvinyl alcohol, and carbon nano-onions were also prepared for comparison purposes. Film characterization was performed with Fourier Transformation Infrared Spectroscopy (FTIR), Thermogravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), Tensile strength, X-ray Diffraction Spectroscopy (XRD), and Scanning Electron Microscopy (SEM). The degradation of films into simulated body fluid (SBF) showed losses between 14% and 16% of the initial weight after 25 days of treatment. Still, a faster degradation (weight loss and pH changes) was obtained with composites of CS-g-CNO due to a higher SBF interaction by hydrogen bonding. On the other hand, in vivo evaluation of nanocomposites during 30 days in Wistar rats, subdermal tissue demonstrated normal resorption of the materials with lower inflammation processes as compared with the physical blends of ox-CNO formulations. SBF hydrolytic results agreed with the in vivo degradation for all samples, demonstrating that with a higher ox-CNO content increased the stability of the material and decreased its degradation capacity; however, we observed greater reabsorption with the formulations including CS-g-CNO. With this research, we demonstrated the future impact of CS/PVA/CS-g-CNO nanocomposite films for biomedical applications.
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Affiliation(s)
- Carlos David Grande Tovar
- Grupo de investigación de fotoquímica y fotobiología, Universidad del Atlántico, Carrera 30 Número 8-49, Puerto Colombia 081008, Colombia;
| | - Jorge Iván Castro
- Grupo de Investigación SIMERQO, Departamento de Química, Universidad del Valle, Calle 13 No. 100-00, Cali 76001, Colombia;
| | - Carlos Humberto Valencia
- Escuela de Odontología, Grupo biomateriales dentales, Universidad del Valle, Calle 4B # 36-00, Cali 76001, Colombia;
| | - Diana Paola Navia Porras
- Grupo de Investigación Biotecnología, Facultad de Ingeniería, Universidad de San Buenaventura Cali, Carrera 122 # 6-65, Cali 76001, Colombia;
| | - José Herminsul Mina Hernandez
- Escuela de Ingeniería de Materiales, Facultad de Ingeniería, Universidad del Valle, Calle 13 No. 100-00, Santiago de Cali 760032, Colombia;
| | - Mayra Eliana Valencia Zapata
- Escuela de Ingeniería de Materiales, Facultad de Ingeniería, Universidad del Valle, Calle 13 No. 100-00, Santiago de Cali 760032, Colombia;
| | - Manuel N. Chaur
- Grupo de Investigación SIMERQO, Departamento de Química, Universidad del Valle, Calle 13 No. 100-00, Cali 76001, Colombia;
- Centro de Excelencia en Nuevos Materiales (CENM), Universidad del Valle, Calle 13 No. 100-00, Santiago de Cali 760032, Colombia
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Garcia PS, Brum DG, Oliveira ON, Higa AM, Ierich JCM, Moraes ADS, Shimizu FM, Okuda-Shinagawa NM, Peroni LA, da Gama PD, Machini MT, Leite FL. Nanoimmunosensor based on atomic force spectroscopy to detect anti-myelin basic protein related to early-stage multiple sclerosis. Ultramicroscopy 2020; 211:112946. [PMID: 32028099 DOI: 10.1016/j.ultramic.2020.112946] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Revised: 12/02/2019] [Accepted: 01/21/2020] [Indexed: 02/06/2023]
Abstract
Multiple Sclerosis (MS) is a chronic inflammatory disorder in the central nervous system for which biomarkers for diagnosis still remain unknown. One potential biomarker is the myelin basic protein. Here, a nanoimmunosensor based on atomic force spectroscopy (AFS) successfully detected autoantibodies against the MBP85-99 peptide from myelin basic protein. The nanoimmunosensor consisted of an atomic force microscope tip functionalization with MBP85-99 peptide, which was made to interact with a mica surface coated either with a layer of anti-MBP85-99 (positive control) or samples of cerebrospinal fluid (CSF) from five multiple sclerosis (MS) patients at different stages of the disease and five non-MS subjects. The adhesion forces obtained from AFS pointed to a high concentration of anti-MBP85-99 for the two patients at early stages of relapsing-remitting multiple sclerosis (RRMS), which were indistinguishable from the positive control. In contrast, considerably lower adhesion forces were measured for all the other eight subjects, including three MS patients with longer history of the disease and under treatment, without episodes of acute MS activity. We have also shown that the average adhesion force between MBP85-99 and anti-MBP85-99 is compatible with the value estimated using steered molecular dynamics. Though further tests will be required with a larger cohort of patients, the present results indicate that the nanoimmunosensor may be a simple tool to detect early-stage MS patients and be useful to understand the molecular mechanisms behind MS.
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Affiliation(s)
- Pâmela Soto Garcia
- Department of Physics, Chemistry and Mathematics, Nanoneurobiophysics Research Group, Federal University of São Carlos, Sorocaba, São Paulo 18052780, Brazil; Institute of Tropical Medicine, University of São Paulo, 05403-000, São Paulo, SP, Brazil
| | - Doralina Guimarães Brum
- Department of Neurology, Psychology and Psychiatry, São Paulo State University, 18618-687, Botucatu, SP, Brazil
| | - Osvaldo N Oliveira
- São Carlos Institute of Physics, University of São Paulo, 13560-970, São Carlos, SP, Brazil
| | - Akemi Martins Higa
- Department of Physics, Chemistry and Mathematics, Nanoneurobiophysics Research Group, Federal University of São Carlos, Sorocaba, São Paulo 18052780, Brazil; Institute of Tropical Medicine, University of São Paulo, 05403-000, São Paulo, SP, Brazil
| | - Jéssica Cristiane Magalhães Ierich
- Department of Physics, Chemistry and Mathematics, Nanoneurobiophysics Research Group, Federal University of São Carlos, Sorocaba, São Paulo 18052780, Brazil; Institute of Tropical Medicine, University of São Paulo, 05403-000, São Paulo, SP, Brazil
| | - Ariana de Souza Moraes
- Department of Physics, Chemistry and Mathematics, Nanoneurobiophysics Research Group, Federal University of São Carlos, Sorocaba, São Paulo 18052780, Brazil; Institute of Tropical Medicine, University of São Paulo, 05403-000, São Paulo, SP, Brazil
| | - Flávio Makoto Shimizu
- São Carlos Institute of Physics, University of São Paulo, 13560-970, São Carlos, SP, Brazil
| | - Nancy M Okuda-Shinagawa
- Department of Biochemistry, Institute of Chemistry, University of São Paulo, 05508-000, São Paulo, SP, Brazil
| | - Luís Antonio Peroni
- Rheabiotech Laboratory Research and Development, 13084-791, Campinas, SP, Brazil
| | | | - M Teresa Machini
- Department of Biochemistry, Institute of Chemistry, University of São Paulo, 05508-000, São Paulo, SP, Brazil
| | - Fabio Lima Leite
- Department of Physics, Chemistry and Mathematics, Nanoneurobiophysics Research Group, Federal University of São Carlos, Sorocaba, São Paulo 18052780, Brazil.
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Phytochemicals and Gastrointestinal Cancer: Cellular Mechanisms and Effects to Change Cancer Progression. Biomolecules 2020; 10:biom10010105. [PMID: 31936288 PMCID: PMC7022462 DOI: 10.3390/biom10010105] [Citation(s) in RCA: 83] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2019] [Revised: 12/21/2019] [Accepted: 12/23/2019] [Indexed: 02/07/2023] Open
Abstract
Gastrointestinal (GI) cancer is a prevailing global health disease with a high incidence rate which varies by region. It is a huge economic burden on health care providers. GI cancer affects different organs in the body such as the gastric organs, colon, esophagus, intestine, and pancreas. Internal and external factors like smoking, obesity, urbanization, genetic mutations, and prevalence of Helicobacter pylori and Hepatitis B and Hepatitis C viral infections could increase the risk of GI cancer. Phytochemicals are non-nutritive bioactive secondary compounds abundantly found in fruits, grains, and vegetables. Consumption of phytochemicals may protect against chronic diseases like cardiovascular disease, neurodegenerative disease, and cancer. Multiple studies have assessed the chemoprotective effect of selected phytochemicals in GI cancer, offering support to their potential towards reducing the pathogenesis of the disease. The aim of this review was to summarize the current knowledge addressing the anti-cancerous effects of selected dietary phytochemicals on GI cancer and their molecular activities on selected mechanisms, i.e., nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB), detoxification enzymes, adenosine monophosphate activated protein kinase (AMPK), wingless-related integration site/β-catenin (wingless-related integration site (Wnt) β-catenin, cell apoptosis, phosphoinositide 3-kinases (PI3K)/ protein kinase B AKT/ mammalian target of rapamycin (mTOR), and mitogen-activated protein kinase (MAPK). In this review phytochemicals were classified into four main categories: (i) carotenoids, including lutein, lycopene, and β-carotene; (ii) proanthocyanidins, including quercetin and ellagic acid; (iii) organosulfur compounds, including allicin, allyl propyl disulphide, asparagusic acid, and sulforaphane; and (iv) other phytochemicals including pectin, curcumins, p-coumaric acid and ferulic acid. Overall, phytochemicals improve cancer prognosis through the downregulation of β-catenin phosphorylation, therefore enhancing apoptosis, and upregulation of the AMPK pathway, which supports cellular homeostasis. Nevertheless, more studies are needed to provide a better understanding of the mechanism of cancer treatment using phytochemicals and possible side effects associated with this approach.
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Functionalization of Carbon Nanomaterials for Biomedical Applications. C — JOURNAL OF CARBON RESEARCH 2019. [DOI: 10.3390/c5040072] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Over the past decade, carbon nanostructures (CNSs) have been widely used in a variety of biomedical applications. Examples are the use of CNSs for drug and protein delivery or in tools to locally dispense nucleic acids to fight tumor affections. CNSs were successfully utilized in diagnostics and in noninvasive and highly sensitive imaging devices thanks to their optical properties in the near infrared region. However, biomedical applications require a complete biocompatibility to avoid adverse reactions of the immune system and CNSs potentials for biodegradability. Water is one of the main constituents of the living matter. Unfortunately, one of the disadvantages of CNSs is their poor solubility. Surface functionalization of CNSs is commonly utilized as an efficient solution to both tune the surface wettability of CNSs and impart biocompatible properties. Grafting functional groups onto the CNSs surface consists in bonding the desired chemical species on the carbon nanoparticles via wet or dry processes leading to the formation of a stable interaction. This latter may be of different nature as the van Der Waals, the electrostatic or the covalent, the π-π interaction, the hydrogen bond etc. depending on the process and on the functional molecule at play. Grafting is utilized for multiple purposes including bonding mimetic agents such as polyethylene glycol, drug/protein adsorption, attaching nanostructures to increase the CNSs opacity to selected wavelengths or provide magnetic properties. This makes the CNSs a very versatile tool for a broad selection of applications as medicinal biochips, new high-performance platforms for magnetic resonance (MR), photothermal therapy, molecular imaging, tissue engineering, and neuroscience. The scope of this work is to highlight up-to-date using of the functionalized carbon materials such as graphene, carbon fibers, carbon nanotubes, fullerene and nanodiamonds in biomedical applications.
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de Souza Moraes A, Brum DG, Ierich JCM, Higa AM, Assis ASJ, Miyazaki CM, Shimizu FM, Peroni LA, Machini MT, Barreira AA, Ferreira M, Oliveira ON, Leite FL. A highly specific and sensitive nanoimmunosensor for the diagnosis of neuromyelitis optica spectrum disorders. Sci Rep 2019; 9:16136. [PMID: 31695085 PMCID: PMC6834626 DOI: 10.1038/s41598-019-52506-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Accepted: 09/30/2019] [Indexed: 11/09/2022] Open
Abstract
A precise diagnosis for neuromyelitis optica spectrum disorders (NMOSD) is crucial to improve patients' prognostic, which requires highly specific and sensitive tests. The cell-based assay with a sensitivity of 76% and specificity of 100% is the most recommended test to detect anti-aquaporin-4 antibodies (AQP4-Ab). Here, we tested four AQP4 external loop peptides (AQP461-70, AQP4131-140, AQP4141-150, and AQP4201-210) with an atomic force microscopy nanoimmunosensor to develop a diagnostic assay. We obtained the highest reactivity with AQP461-70-nanoimunosensor. This assay was effective in detecting AQP4-Ab in sera of NMOSD patients with 100% specificity (95% CI 63.06-100), determined by the cut-off adhesion force value of 241.3 pN. NMOSD patients were successfully discriminated from a set of healthy volunteers, patients with multiple sclerosis, and AQP4-Ab-negative patients. AQP461-70 sensitivity was 81.25% (95% CI 56.50-99.43), slightly higher than with the CBA method. The results with the AQP461-70-nanoimmunosensor indicate that the differences between NMOSD seropositive and seronegative phenotypes are related to disease-specific epitopes. The absence of AQP4-Ab in sera of NMOSD AQP4-Ab-negative patients may be interpreted by assuming the existence of another potential AQP4 peptide sequence or non-AQP4 antigens as the antibody target.
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Affiliation(s)
- Ariana de Souza Moraes
- Institute of Tropical Medicine of São Paulo, University of São Paulo, São Paulo, São Paulo, 05403000, Brazil
- Department of Physics, Chemistry and Mathematics, Federal University of São Carlos, Sorocaba, São Paulo, 18052780, Brazil
- Nanoneurobiophysics research group (GNN), Federal University of São Carlos, Sorocaba, São Paulo, 18052780, Brazil
| | - Doralina Guimarães Brum
- Nanoneurobiophysics research group (GNN), Federal University of São Carlos, Sorocaba, São Paulo, 18052780, Brazil
- Department of Neurology, Psychology and Psychiatry, São Paulo State University, Botucatu, São Paulo, 18618687, Brazil
| | - Jéssica Cristiane Magalhães Ierich
- Institute of Tropical Medicine of São Paulo, University of São Paulo, São Paulo, São Paulo, 05403000, Brazil
- Department of Physics, Chemistry and Mathematics, Federal University of São Carlos, Sorocaba, São Paulo, 18052780, Brazil
- Nanoneurobiophysics research group (GNN), Federal University of São Carlos, Sorocaba, São Paulo, 18052780, Brazil
| | - Akemi Martins Higa
- Institute of Tropical Medicine of São Paulo, University of São Paulo, São Paulo, São Paulo, 05403000, Brazil
- Department of Physics, Chemistry and Mathematics, Federal University of São Carlos, Sorocaba, São Paulo, 18052780, Brazil
- Nanoneurobiophysics research group (GNN), Federal University of São Carlos, Sorocaba, São Paulo, 18052780, Brazil
| | - Amanda Stefanie Jabur Assis
- Department of Physics, Chemistry and Mathematics, Federal University of São Carlos, Sorocaba, São Paulo, 18052780, Brazil
- Nanoneurobiophysics research group (GNN), Federal University of São Carlos, Sorocaba, São Paulo, 18052780, Brazil
| | - Celina Massumi Miyazaki
- Department of Physics, Chemistry and Mathematics, Federal University of São Carlos, Sorocaba, São Paulo, 18052780, Brazil
| | - Flávio Makoto Shimizu
- São Carlos Institute of Physics, University of São Paulo, São Carlos, São Paulo, 13560970, Brazil
| | - Luís Antonio Peroni
- Rheabiotech Laboratory of Research and Development, Campinas, São Paulo, 13084791, Brazil
| | - M Teresa Machini
- Department of Biochemistry, Institute of Chemistry, University of São Paulo, São Paulo, 05508000, Brazil
| | - Amilton Antunes Barreira
- Department of Neurosciences and Behavioural Sciences, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Marystela Ferreira
- Department of Physics, Chemistry and Mathematics, Federal University of São Carlos, Sorocaba, São Paulo, 18052780, Brazil
| | - Osvaldo N Oliveira
- São Carlos Institute of Physics, University of São Paulo, São Carlos, São Paulo, 13560970, Brazil
| | - Fabio Lima Leite
- Department of Physics, Chemistry and Mathematics, Federal University of São Carlos, Sorocaba, São Paulo, 18052780, Brazil.
- Nanoneurobiophysics research group (GNN), Federal University of São Carlos, Sorocaba, São Paulo, 18052780, Brazil.
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Qian L, Li Q, Baryeh K, Qiu W, Li K, Zhang J, Yu Q, Xu D, Liu W, Brand RE, Zhang X, Chen W, Liu G. Biosensors for early diagnosis of pancreatic cancer: a review. Transl Res 2019; 213:67-89. [PMID: 31442419 DOI: 10.1016/j.trsl.2019.08.002] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Revised: 08/06/2019] [Accepted: 08/06/2019] [Indexed: 12/21/2022]
Abstract
Pancreatic cancer is characterized by extremely high mortality and poor prognosis and is projected to be the leading cause of cancer deaths by 2030. Due to the lack of early symptoms and appropriate methods to detect pancreatic carcinoma at an early stage as well as its aggressive progression, the disease is often quite advanced by the time a definite diagnosis is established. The 5-year relative survival rate for all stages is approximately 8%. Therefore, detection of pancreatic cancer at an early surgically resectable stage is the key to decrease mortality and to improve survival. The traditional methods for diagnosing pancreatic cancer involve an imaging test, such as ultrasound or magnetic resonance imaging, paired with a biopsy of the mass in question. These methods are often expensive, time consuming, and require trained professionals to use the instruments and analyze the imaging. To overcome these issues, biosensors have been proposed as a promising tool for the early diagnosis of pancreatic cancer. The present review critically discusses the latest developments in biosensors for the early diagnosis of pancreatic cancer. Protein and microRNA biomarkers of pancreatic cancer and corresponding biosensors for pancreatic cancer diagnosis have been reviewed, and all these cases demonstrate that the emerging biosensors are becoming an increasingly relevant alternative to traditional techniques. In addition, we discuss the existing problems in biosensors and future challenges.
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Affiliation(s)
- Lisheng Qian
- Institute of Biomedical and Health, School of Life and Health Science, Anhui Science and Technology University, Fengyang, Anhui, PR China
| | - Qiaobin Li
- Department of Chemistry & Biochemistry, North Dakota State University, Fargo, North Dakota
| | - Kwaku Baryeh
- Department of Chemistry & Biochemistry, North Dakota State University, Fargo, North Dakota
| | - Wanwei Qiu
- Institute of Biomedical and Health, School of Life and Health Science, Anhui Science and Technology University, Fengyang, Anhui, PR China
| | - Kun Li
- Institute of Biomedical and Health, School of Life and Health Science, Anhui Science and Technology University, Fengyang, Anhui, PR China
| | - Jing Zhang
- Institute of Biomedical and Health, School of Life and Health Science, Anhui Science and Technology University, Fengyang, Anhui, PR China
| | - Qingcai Yu
- Institute of Biomedical and Health, School of Life and Health Science, Anhui Science and Technology University, Fengyang, Anhui, PR China
| | - Dongqin Xu
- Institute of Biomedical and Health, School of Life and Health Science, Anhui Science and Technology University, Fengyang, Anhui, PR China
| | - Wenju Liu
- Institute of Biomedical and Health, School of Life and Health Science, Anhui Science and Technology University, Fengyang, Anhui, PR China
| | - Randall E Brand
- Division of Gastroenterology, Hepatology and Nutrition, University of Pittsburgh Medical Center, Hillman Cancer Center, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Xueji Zhang
- Institute of Biomedical and Health, School of Life and Health Science, Anhui Science and Technology University, Fengyang, Anhui, PR China; School of Biomedical Engineering, Shenzhen University Health Science Center, Shenzhen, Guangdong, PR China.
| | - Wei Chen
- Institute of Biomedical and Health, School of Life and Health Science, Anhui Science and Technology University, Fengyang, Anhui, PR China; School of Food Science & Engineering, Hefei University of Technology, Hefei, Anhui, PR China.
| | - Guodong Liu
- Institute of Biomedical and Health, School of Life and Health Science, Anhui Science and Technology University, Fengyang, Anhui, PR China; Department of Chemistry & Biochemistry, North Dakota State University, Fargo, North Dakota.
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41
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Grande Tovar CD, Castro JI, Valencia CH, Navia Porras DP, Mina Hernandez JH, Valencia ME, Velásquez JD, Chaur MN. Preparation of Chitosan/Poly(Vinyl Alcohol) Nanocomposite Films Incorporated with Oxidized Carbon Nano-Onions (Multi-Layer Fullerenes) for Tissue-Engineering Applications. Biomolecules 2019; 9:E684. [PMID: 31683889 PMCID: PMC6920947 DOI: 10.3390/biom9110684] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 10/23/2019] [Accepted: 10/24/2019] [Indexed: 02/07/2023] Open
Abstract
Recently, tissue engineering became a very important medical alternative in patients who need to regenerate damaged or lost tissues through the use of scaffolds that support cell adhesion and proliferation. Carbon nanomaterials (carbon nanotubes, fullerenes, multi-wall fullerenes, and graphene) became a very important alternative to reinforce the mechanical, thermal, and antimicrobial properties of several biopolymers. In this work, five different formulations of chitosan/poly(vinyl alcohol)/oxidized carbon nano-onions (CS/PVA/ox-CNO) were used to prepare biodegradable scaffolds with potential biomedical applications. Film characterization consisted of Fourier-transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), tension strength, Young's modulus, X-ray diffraction spectroscopy (XRD), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS). The degradation in a simulated body fluid (FBS) demonstrated that all the formulations lost between 75% and 80% of their weight after 15 days of treatment, but the degradation decreased with the ox-CNO content. In vivo tests after 90 days of subdermal implantation of the nanocomposite films in Wistar rats' tissue demonstrated good biocompatibility without allergenic reactions or pus formation. There was a good correlation between FBS hydrolytic degradation and degradation in vivo for all the samples, since the ox-CNO content increased the stability of the material. All these results indicate the potential of the CS/PVA/ox-CNO nanocomposite films in tissue engineering, especially for long-term applications.
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Affiliation(s)
- Carlos David Grande Tovar
- Grupo de Investigación de fotoquímica y fotobiología, Universidad del Atlántico, Carrera 30 Número 8-49, Puerto Colombia 081008, Colombia.
| | - Jorge Iván Castro
- Grupo de Investigación SIMERQO, Departamento de Química, Universidad del Valle, Calle 13 No. 100-00, Cali 76001, Colombia.
| | - Carlos Humberto Valencia
- Escuela de Odontología, Grupo biomateriales dentales, Universidad del Valle, Calle 13 No. 100-00, Cali 76001, Colombia.
| | - Diana Paola Navia Porras
- Grupo de Investigación Biotecnología, Facultad de Ingeniería, Universidad de San Buenaventura Cali, Carrera 122 # 6-65, Cali 76001, Colombia.
| | - José Herminsul Mina Hernandez
- Escuela de Ingeniería de Materiales, Facultad de Ingeniería, Universidad del Valle, Calle 13 No. 100-00, Santiago de Cali 760032, Colombia.
| | - Mayra Eliana Valencia
- Escuela de Ingeniería de Materiales, Facultad de Ingeniería, Universidad del Valle, Calle 13 No. 100-00, Santiago de Cali 760032, Colombia.
| | - José Daniel Velásquez
- Grupo de Investigación SIMERQO, Departamento de Química, Universidad del Valle, Calle 13 No. 100-00, Cali 76001, Colombia.
| | - Manuel N Chaur
- Grupo de Investigación SIMERQO, Departamento de Química, Universidad del Valle, Calle 13 No. 100-00, Cali 76001, Colombia.
- Centro de Excelencia en Nuevos Materiales (CENM), Universidad del Valle, Calle 13 No. 100-00, Santiago de Cali 760032, Colombia.
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