1
|
Wang X, Liu C, Tao H, Jing H, Li R, Zhao Y, Chen X, Zhao X, Liu J, Zhang H, Li N. Mesoporous silica-stabilized magnetite nanoparticles with peroxidase-like activities for sensitively detecting cholesterol in animal-derived foods. Colloids Surf B Biointerfaces 2024; 233:113653. [PMID: 37988771 DOI: 10.1016/j.colsurfb.2023.113653] [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: 02/13/2023] [Revised: 11/01/2023] [Accepted: 11/13/2023] [Indexed: 11/23/2023]
Abstract
Sensitive detection of cholesterol in animal-derived foods is crucial for maintaining human healthy diets. In this study, an elegant approach utilizing inorganic nanozyme-based magnetic mesoporous silica nanoparticles (MMSNs) for the highly sensitive detection of cholesterol in animal-derived food products was reported. The results revealed the fabricated MMSNs exhibited remarkably intrinsic peroxidase (POD)-like catalytic activities with improved affinity, and the catalytic behavior aligned well with Michaelis-Menten equation. In addition, the data indicated that the MMSNs enabled visual colorimetric detection of cholesterol with a remarkably low detection limit of 7.12 μM by combining catalytic oxidation with cholesterol oxidase (ChOx). Furthermore, the prepared MMSNs were successfully employed for assessing cholesterol content in milk and egg yolk samples, indicating potential applications for cholesterol detection in animal-derived foods in future.
Collapse
Affiliation(s)
- Xueqin Wang
- College of Bioengineering, Henan University of Technology, Zhengzhou, Henan 450001, China; Key Laboratory of Functional Molecules for Biomedical Research, Zhengzhou, Henan 450001, China.
| | - Chuan Liu
- College of Bioengineering, Henan University of Technology, Zhengzhou, Henan 450001, China; Key Laboratory of Functional Molecules for Biomedical Research, Zhengzhou, Henan 450001, China
| | - Haizhen Tao
- College of Bioengineering, Henan University of Technology, Zhengzhou, Henan 450001, China; Key Laboratory of Functional Molecules for Biomedical Research, Zhengzhou, Henan 450001, China
| | - Hongjuan Jing
- College of Bioengineering, Henan University of Technology, Zhengzhou, Henan 450001, China; Key Laboratory of Functional Molecules for Biomedical Research, Zhengzhou, Henan 450001, China
| | - Ruifang Li
- College of Bioengineering, Henan University of Technology, Zhengzhou, Henan 450001, China; Key Laboratory of Functional Molecules for Biomedical Research, Zhengzhou, Henan 450001, China
| | - Yingyuan Zhao
- College of Bioengineering, Henan University of Technology, Zhengzhou, Henan 450001, China; Key Laboratory of Functional Molecules for Biomedical Research, Zhengzhou, Henan 450001, China
| | - Xuyang Chen
- College of Bioengineering, Henan University of Technology, Zhengzhou, Henan 450001, China; Key Laboratory of Functional Molecules for Biomedical Research, Zhengzhou, Henan 450001, China
| | - Xuanping Zhao
- College of Bioengineering, Henan University of Technology, Zhengzhou, Henan 450001, China; Key Laboratory of Functional Molecules for Biomedical Research, Zhengzhou, Henan 450001, China
| | - Junyan Liu
- Henan Institute of Medical and Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Huiru Zhang
- College of Bioengineering, Henan University of Technology, Zhengzhou, Henan 450001, China; Key Laboratory of Functional Molecules for Biomedical Research, Zhengzhou, Henan 450001, China.
| | - Na Li
- Henan Institute of Medical and Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, Henan 450001, China.
| |
Collapse
|
2
|
Amouzadeh Tabrizi M. A Facile Method for the Fabrication of the Microneedle Electrode and Its Application in the Enzymatic Determination of Glutamate. BIOSENSORS 2023; 13:828. [PMID: 37622914 PMCID: PMC10452303 DOI: 10.3390/bios13080828] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Revised: 08/09/2023] [Accepted: 08/16/2023] [Indexed: 08/26/2023]
Abstract
Herein, a simple method has been used in the fabrication of a microneedle electrode (MNE). To do this, firstly, a commercial self-dissolving microneedle patch has been used to make a hard-polydimethylsiloxane-based micro-pore mold (MPM). Then, the pores of the MPM were filled with the conductive platinum (Pt) paste and cured in an oven. Afterward, the MNE made of platinum (Pt-MNE) was characterized using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM). To prove the electrochemical applicability of the Pt-MNE, the glutamate oxidase enzyme was immobilized on the surface of the electrode, to detect glutamate, using the cyclic voltammetry (CV) and chronoamperometry (CA) methods. The obtained results demonstrated that the fabricated biosensor could detect a glutamate concentration in the range of 10-150 µM. The limits of detection (LODs) (three standard deviations of the blank/slope) were also calculated to be 0.25 µM and 0.41 µM, using CV and CA, respectively. Furthermore, the Michaelis-Menten constant (KMapp) of the biosensor was calculated to be 296.48 µM using a CA method. The proposed biosensor was finally applied, to detect the glutamate concentration in human serum samples. The presented method for the fabrication of the mold signifies a step further toward the fabrication of a microneedle electrode.
Collapse
|
3
|
Barua B, Durkin TJ, Beeley IM, Gadh A, Savagatrup S. Multiplexed and continuous microfluidic sensors using dynamic complex droplets. SOFT MATTER 2023; 19:1930-1940. [PMID: 36807488 DOI: 10.1039/d3sm00074e] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Emissive complex droplets with reconfigurable morphology and dynamic optical properties offer exciting opportunities as chemical sensors due to their stimuli-responsive characteristics. In this work, we demonstrated a real-time optical sensing platform that combines poly(dimethylsiloxane) (PDMS) microfluidics and complex droplets as sensing materials. We utilized a mechanism, called directional emission, to transduce changes in interfacial tension into optical signals. We discuss the fabrication and integration of PDMS microfluidics with complex emulsions to facilitate continuous measurement of fluorescent emission and, ultimately, the interfacial tensions. Furthermore, by varying the interfacial functionalization and fluorescent dye with characteristic wavelength, we generate multiple formulations of droplets and obtain differential responses to stimuli that alter interfacial tensions (i.e., composition of surfactants, pH). Our results illustrate a proof-of-concept multiplexed and continuous sensing platform with potential applications in miniaturized, on-site environmental monitoring and biosensing.
Collapse
Affiliation(s)
- Baishali Barua
- Department of Chemical and Environmental Engineering, University of Arizona, 1133 E. James E. Rogers Way, Tucson, Arizona 85721, USA.
| | - Tyler J Durkin
- Department of Chemical and Environmental Engineering, University of Arizona, 1133 E. James E. Rogers Way, Tucson, Arizona 85721, USA.
| | - Isabel M Beeley
- Department of Chemical and Environmental Engineering, University of Arizona, 1133 E. James E. Rogers Way, Tucson, Arizona 85721, USA.
| | - Aakanksha Gadh
- Department of Chemical and Environmental Engineering, University of Arizona, 1133 E. James E. Rogers Way, Tucson, Arizona 85721, USA.
| | - Suchol Savagatrup
- Department of Chemical and Environmental Engineering, University of Arizona, 1133 E. James E. Rogers Way, Tucson, Arizona 85721, USA.
| |
Collapse
|
4
|
Li SN, Peeling P, Scott BR, Peiffer JJ, Shaykevich A, Girard O. Automatic heart rate clamp: A practical tool to control internal and external training loads during aerobic exercise. Front Physiol 2023; 14:1170105. [PMID: 37089418 PMCID: PMC10119421 DOI: 10.3389/fphys.2023.1170105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Accepted: 03/29/2023] [Indexed: 04/25/2023] Open
Affiliation(s)
- Siu Nam Li
- School of Human Sciences (Exercise and Sports Science), The University of Western Australia, Perth, WA, Australia
- *Correspondence: Siu Nam Li, ; Olivier Girard,
| | - Peter Peeling
- School of Human Sciences (Exercise and Sports Science), The University of Western Australia, Perth, WA, Australia
- Department of Sport Science, Western Australian Institute of Sport, Mount Claremont, WA, Australia
| | - Brendan R. Scott
- Murdoch Applied Sport Science Laboratory, Discipline of Exercise Science, Murdoch University, Perth, WA, Australia
- Centre for Healthy Ageing, Murdoch University, Perth, WA, Australia
| | - Jeremiah J. Peiffer
- Murdoch Applied Sport Science Laboratory, Discipline of Exercise Science, Murdoch University, Perth, WA, Australia
- Centre for Healthy Ageing, Murdoch University, Perth, WA, Australia
| | - Alex Shaykevich
- School of Human Sciences (Exercise and Sports Science), The University of Western Australia, Perth, WA, Australia
- Perron Institute for Neurological and Translational Science, Perth, WA, Australia
| | - Olivier Girard
- School of Human Sciences (Exercise and Sports Science), The University of Western Australia, Perth, WA, Australia
- *Correspondence: Siu Nam Li, ; Olivier Girard,
| |
Collapse
|
5
|
Tackling the challenges of developing microneedle-based electrochemical sensors. Mikrochim Acta 2022; 189:440. [DOI: 10.1007/s00604-022-05510-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Accepted: 09/21/2022] [Indexed: 11/06/2022]
|
6
|
Ju J, Li L, Regmi S, Zhang X, Tang S. Microneedle-Based Glucose Sensor Platform: From Vitro to Wearable Point-of-Care Testing Systems. BIOSENSORS 2022; 12:bios12080606. [PMID: 36005002 PMCID: PMC9405967 DOI: 10.3390/bios12080606] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Revised: 07/23/2022] [Accepted: 07/27/2022] [Indexed: 11/21/2022]
Abstract
Significant advanced have recently been made in exploiting microneedle-based (MN-based) diabetes devices for minimally invasive wearable biosensors and for continuous glucose monitoring. Within this emerging class of skin-worn MN-based sensors, the ISF can be utilized as a rich biomarker source to diagnose diabetes. While initial work of MN devices focused on ISF extraction, the recent research trend has been oriented toward developing in vivo glucose sensors coupled with optical or electrochemical (EC) instrumentation. This outlook highlights the essential characteristics of the sensing mechanisms, rational design, sensing properties, and applications. Finally, we describe the opinions about the challenge and prospects of optical and EC MN-based device platforms for the fabrication of wearable biosensors and their application potential in the future.
Collapse
Affiliation(s)
- Jian Ju
- Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou 325001, China
- Oujiang Lab, Wenzhou 325001, China
- Correspondence: (J.J.); (S.T.)
| | - Lin Li
- Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou 325001, China
- School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou 325035, China
| | - Sagar Regmi
- Department of Pharmacology, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Xinyu Zhang
- Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou 325001, China
| | - Shixing Tang
- Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou 325001, China
- Department of Epidemiology, School of Public Health, Southern Medical University, Guangzhou 510515, China
- Correspondence: (J.J.); (S.T.)
| |
Collapse
|
7
|
Tortolini C, Cass AEG, Pofi R, Lenzi A, Antiochia R. Microneedle-based nanoporous gold electrochemical sensor for real-time catecholamine detection. Mikrochim Acta 2022; 189:180. [PMID: 35391571 PMCID: PMC8989844 DOI: 10.1007/s00604-022-05260-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Accepted: 03/04/2022] [Indexed: 11/21/2022]
Abstract
Dopamine (DA), epinephrine (EP), and norepinephrine (NEP) are the main catecholamine of clinical interest, as they play crucial roles in the regulation of nervous and cardiovascular systems and are involved in some brain behaviors, such as stress, panic, anxiety, and depression. Therefore, there is an urgent need for a reliable sensing device able to provide their continuous monitoring in a minimally invasive manner. In this work, the first highly nanoporous gold (h-nPG) microneedle-based sensor is presented for continuous monitoring of catecholamine in interstitial fluid (ISF). The h-nPG microneedle-based gold electrode was prepared by a simple electrochemical self-templating method that involves two steps, gold electrodeposition and hydrogen bubbling at the electrode surface, realized by sweeping the potential between + 0.8 V and 0 V vs Ag/AgCl for 25 scans in a 10 mM HAuCl4 solution containing 2.5 M NH4Cl, and successively applying a fixed potential of − 2 V vs Ag/AgCl for 60 s. The resulting microneedle-based h-nPG sensor displays an interference-free total catecholamine detection expressed as NEP concentration, with a very low LOD of 100 nM, excellent sensitivity and stability, and fast response time (< 4 s). The performance of the h-nPG microneedle array sensor was successively assessed in artificial ISF and in a hydrogel skin model at typical physiological concentrations.
Collapse
Affiliation(s)
- Cristina Tortolini
- Department of Chemistry and Drug Technologies, Sapienza University of Rome, P.le Aldo Moro 5, 00185, Rome, Italy
| | - Anthony E G Cass
- Department of Chemistry & Institute of Biomedical Engineering, Imperial College, London, UK
| | - Riccardo Pofi
- Department of Experimental Medicine, Sapienza University of Rome, Rome, Italy
| | - Andrea Lenzi
- Department of Experimental Medicine, Sapienza University of Rome, Rome, Italy
| | - Riccarda Antiochia
- Department of Chemistry and Drug Technologies, Sapienza University of Rome, P.le Aldo Moro 5, 00185, Rome, Italy.
| |
Collapse
|
8
|
Manasa G, Mascarenhas RJ, Shetti NP, Malode SJ, Mishra A, Basu S, Aminabhavi TM. Skin Patchable Sensor Surveillance for Continuous Glucose Monitoring. ACS APPLIED BIO MATERIALS 2022; 5:945-970. [PMID: 35170319 DOI: 10.1021/acsabm.1c01289] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Diabetes mellitus is a physiological and metabolic disorder affecting millions of people worldwide, associated with global morbidity, mortality, and financial expenses. Long-term complications can be avoided by frequent, continuous self-monitoring of blood glucose. Therefore, this review summarizes the current state-of-art glycemic control regimes involving measurement approaches and basic concepts. Following an introduction to the significance of continuous glucose sensing, we have tracked the evolution of glucose monitoring devices from minimally invasive to non-invasive methods to present an overview of the spectrum of continuous glucose monitoring (CGM) technologies. The conveniences, accuracy, and cost-effectiveness of the real-time CGM systems (rt-CGMs) are the factors considered for discussion. Transdermal biosensing and drug delivery routes have recently emerged as an innovative approach to substitute hypodermal needles. This work reviews skin-patchable glucose monitoring sensors for the first time, providing specifics of all the major findings in the past 6 years. Skin patch sensors and their progressive form, i.e., microneedle (MN) array sensory and delivery systems, are elaborated, covering self-powered, enzymatic, and non-enzymatic devices. The critical aspects reviewed are material design and assembly techniques focusing on flexibility, sensitivity, selectivity, biocompatibility, and user-end comfort. The review highlights the advantages of patchable MNs' multi-sensor technology designed to maintain precise blood glucose levels and administer diabetes drugs or insulin through a "sense and act" feedback loop. Subsequently, the limitations and potential challenges encountered from the MN array as rt-CGMs are listed. Furthermore, the current statuses of working prototype glucose-responsive "closed-loop" insulin delivery systems are discussed. Finally, the expected future developments and outlooks in clinical applications are discussed.
Collapse
Affiliation(s)
- G Manasa
- Electrochemistry Research Group, Department of Chemistry, St. Joseph's College (Autonomous), Lalbagh Road, Bangalore, Karnataka 560027, India
| | - Ronald J Mascarenhas
- Electrochemistry Research Group, Department of Chemistry, St. Joseph's College (Autonomous), Lalbagh Road, Bangalore, Karnataka 560027, India
| | - Nagaraj P Shetti
- Department of Chemistry, School of Advanced Sciences, KLE Technological University, Vidyanagar, Hubballi, Karnataka 580031, India
| | - Shweta J Malode
- Department of Chemistry, School of Advanced Sciences, KLE Technological University, Vidyanagar, Hubballi, Karnataka 580031, India
| | - Amit Mishra
- Department of Chemical Engineering, Inha University, Incheon 22212, South Korea
| | - Soumen Basu
- School of Chemistry and Biochemistry, Thapar Institute of Engineering & Technology, Patiala, Punjab 147004, India
| | - Tejraj M Aminabhavi
- Department of Chemistry, School of Advanced Sciences, KLE Technological University, Vidyanagar, Hubballi, Karnataka 580031, India
| |
Collapse
|
9
|
Abstract
Dermal interstitial fluid (ISF) is a novel source of biomarkers that can be considered as an alternative to blood sampling for disease diagnosis and treatment. Nevertheless, in vivo extraction and analysis of ISF are challenging. On the other hand, microneedle (MN) technology can address most of the challenges associated with dermal ISF extraction and is well suited for long-term, continuous ISF monitoring as well as in situ detection. In this review, we first briefly summarise the different dermal ISF collection methods and compare them with MN methods. Next, we elaborate on the design considerations and biocompatibility of MNs. Subsequently, the fabrication technologies of various MNs used for dermal ISF extraction, including solid MNs, hollow MNs, porous MNs, and hydrogel MNs, are thoroughly explained. In addition, different sensing mechanisms of ISF detection are discussed in detail. Subsequently, we identify the challenges and propose the possible solutions associated with ISF extraction. A detailed investigation is provided for the transport and sampling mechanism of ISF in vivo. Also, the current in vitro skin model integrated with the MN arrays is discussed. Finally, future directions to develop a point-of-care (POC) device to sample ISF are proposed.
Collapse
|
10
|
García-Guzmán JJ, Pérez-Ràfols C, Cuartero M, Crespo GA. Microneedle based electrochemical (Bio)Sensing: Towards decentralized and continuous health status monitoring. Trends Analyt Chem 2021. [DOI: 10.1016/j.trac.2020.116148] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
|
11
|
Madden J, O'Mahony C, Thompson M, O'Riordan A, Galvin P. Biosensing in dermal interstitial fluid using microneedle based electrochemical devices. SENSING AND BIO-SENSING RESEARCH 2020. [DOI: 10.1016/j.sbsr.2020.100348] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
|
12
|
Avari P, Reddy M, Oliver N. Is it possible to constantly and accurately monitor blood sugar levels, in people with Type 1 diabetes, with a discrete device (non-invasive or invasive)? Diabet Med 2020; 37:532-544. [PMID: 30803028 DOI: 10.1111/dme.13942] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 02/22/2019] [Indexed: 12/15/2022]
Abstract
Real-time continuous glucose monitors using subcutaneous needle-type sensors continue to develop. The limitations of currently available systems, however, include time lag behind changes in blood glucose, the invasive nature of such systems, and in some cases, their accuracy. Non-invasive techniques have been developed, but, to date, no commercial device has been successful. A key research priority for people with Type 1 diabetes identified by the James Lind Alliance was to identify ways of monitoring blood glucose constantly and accurately using a discrete device, invasive or non-invasive. Integration of such a sensor is important in the development of a closed-loop system and the technology must be rapid, selective and acceptable for continuous use by individuals. The present review provides an update on existing continuous glucose-sensing technologies, and an overview of emergent techniques, including their accuracy and limitations.
Collapse
Affiliation(s)
- P Avari
- Division of Diabetes, Endocrinology and Metabolism, Faculty of Medicine, Imperial College, London, UK
| | - M Reddy
- Division of Diabetes, Endocrinology and Metabolism, Faculty of Medicine, Imperial College, London, UK
| | - N Oliver
- Division of Diabetes, Endocrinology and Metabolism, Faculty of Medicine, Imperial College, London, UK
| |
Collapse
|
13
|
Microneedle biosensors for real-time, minimally invasive drug monitoring of phenoxymethylpenicillin: a first-in-human evaluation in healthy volunteers. LANCET DIGITAL HEALTH 2019; 1:e335-e343. [DOI: 10.1016/s2589-7500(19)30131-1] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Revised: 08/08/2019] [Accepted: 08/22/2019] [Indexed: 02/07/2023]
|
14
|
Minimally Invasive Glucose Monitoring Using a Highly Porous Gold Microneedles-Based Biosensor: Characterization and Application in Artificial Interstitial Fluid. Catalysts 2019. [DOI: 10.3390/catal9070580] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
In this paper, we present the first highly porous gold (h-PG) microneedles-based second-generation biosensor for minimally invasive monitoring of glucose in artificial interstitial fluid (ISF). A highly porous microneedles-based electrode was prepared by a simple electrochemical self-templating method that involves two steps, gold electrodeposition and hydrogen bubbling at the electrode, which were realized by applying a potential of −2 V versus a saturated calomel electrode (SCE). The highly porous gold surface of the microneedles was modified by immobilization of 6-(ferrocenyl)hexanethiol (FcSH) as a redox mediator and subsequently by immobilization of a flavin adenine dinucleotide glucose dehydrogenase (FAD-GDH) enzyme using a drop-casting method. The microneedles-based FcSH/FAD-GDH biosensor allows for the detection of glucose in artificial interstitial fluid with an extended linear range (0.1–10 mM), high sensitivity (50.86 µA cm−2 mM−1), stability (20% signal loss after 30 days), selectivity (only ascorbic acid showed a response about 10% of glucose signal), and a short response time (3 s). These properties were favourably compared to other microneedles-based glucose biosensors reported in the literature. Finally, the microneedle-arrays-based second-generation biosensor for glucose detection was tested in artificial interstitial fluid opportunely spiked with different concentrations of glucose (simulating healthy physiological conditions while fasting and after lunch) and by placing the electrode into a simulated chitosan/agarose hydrogel skin model embedded in the artificial ISF (continuous glucose monitoring). The obtained current signals had a lag-time of about 2 min compared to the experiments in solution, but they fit perfectly into the linearity range of the biosensor (0.1–10 mM). These promising results show that the proposed h-PG microneedles-based sensor could be used as a wearable, disposable, user-friendly, and automated diagnostic tool for diabetes patients.
Collapse
|
15
|
Abstract
Phagocytes protect the organism by ingesting harmful foreign particles and cells. We use mesoscale computer simulations to design a phagocyte-inspired active microcapsule that is capable of selectively capturing nanoparticles dispersed in solvent. Our fully synthetic microdevice is actuated by a temperature-sensitive microgel enclosed inside a perforated spherical shell. The shell pores are decorated with a copolymer brush that regulates the transport of solutes into the capsule interior. When exposed to an external stimulus, the microgel swells, expanding through the shell pores to make contact with the nanoparticle-rich solution surrounding the capsule. Upon removal of the external stimulus, the gel retracts back into the shell, bringing along with it captured nanoparticles. We probe how periodic application of the stimulus combined with nanoparticle-microgel adhesion enable selectivity and enhance capturing efficiency of our nature-inspired microdevice.
Collapse
Affiliation(s)
| | - Alberto Fernandez-Nieves
- Department of Condensed Matter Physics, University of Barcelona, 08028 Barcelona, Spain
- ICREA-Institucio Catalana de Recerca i Estudis Avancats, 08010 Barcelona, Spain
| | | |
Collapse
|
16
|
Microneedle-based biosensor for minimally-invasive lactate detection. Biosens Bioelectron 2019; 123:152-159. [DOI: 10.1016/j.bios.2018.08.010] [Citation(s) in RCA: 106] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Revised: 08/03/2018] [Accepted: 08/07/2018] [Indexed: 01/27/2023]
|
17
|
Takeuchi K, Kim B. Functionalized microneedles for continuous glucose monitoring. NANO CONVERGENCE 2018; 5:28. [PMID: 30467645 PMCID: PMC6199201 DOI: 10.1186/s40580-018-0161-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Accepted: 09/26/2018] [Indexed: 05/23/2023]
Abstract
Microneedles (MNs) have been established as promising medical devices as they are minimally invasive, cause less pain, and can be utilized for self-administration of drugs by patients. There has been rapid development in MNs for transdermal monitoring and diagnostic systems, following the active research on fabrication methods and applications for drug delivery. In this paper, recent investigations on bio-sensing using MNs are reviewed in terms of the applicability to continuous glucose monitoring system (CGMS), which is one of the main research focuses of medical engineering technologies. The trend of the functionalized MNs can be categorized as follows: (i) as a sensing probe, and (ii) as a biological fluid collector. MNs as in vivo sensors are mainly integrated or coated with conductive materials to have the function as electrodes. MNs as fluid collectors are given a certain geometrical design, such as a hollow and porous structure aided by a capillary action or negative pressure, to extract the interstitial fluids or blood for ex vivo analysis. For realization of CGMS with MNs, a long-term accurate measurement by the MN-based sensing probe or a fluidic connection between the MN-based fluid collector and the existing microfluidic measurement systems should be investigated.
Collapse
Affiliation(s)
- Kai Takeuchi
- Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8505 Japan
| | - Beomjoon Kim
- Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8505 Japan
| |
Collapse
|
18
|
Rawson TM, Sharma S, Georgiou P, Holmes A, Cass A, O'Hare D. Towards a minimally invasive device for beta-lactam monitoring in humans. Electrochem commun 2017; 82:1-5. [PMID: 31031564 PMCID: PMC6485621 DOI: 10.1016/j.elecom.2017.07.011] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Antimicrobial resistance is a leading patient safety issue. There is a need to develop novel mechanisms for monitoring and subsequently improving the precision of how we use antibiotics. A surface modified microneedle array was developed for monitoring beta-lactam antibiotic levels in human interstitial fluid. The sensor was fabricated by anodically electrodepositing iridium oxide (AEIROF) onto a platinum surface on the microneedle followed by fixation of beta-lactamase enzyme within a hydrogel. Calibration of the sensor was performed to penicillin-G in buffer solution (PBS) and artificial interstitial fluid (ISF). Further calibration of a platinum disc electrode was undertaken using amoxicillin and ceftriaxone. Open-circuit potentials were performed and data analysed using the Hill equation and log(concentration [M]) plots. The microneedle sensor demonstrated high reproducibility between penicillin-G runs in PBS with mean Km (±1SD) = 0.0044 ± 0.0013 M and mean slope function of log(concentration plots) 29 ± 1.80 mV/decade (r2=0.933). Response was reproducible after 28 days storage at 4°C. In artificial ISF, the sensors response was Km (±1SD) = 0.0077 ± 0.0187 M and a slope function of 34 ± 1.85 mv/decade (r2=0.995). Our results suggest that microneedle array based beta-lactam sensing may be a future application of this AEIROF based enzymatic sensor.
Collapse
Affiliation(s)
- Timothy Miles Rawson
- National Institute for Health Research Health Protection Research Unit in Healthcare Associated Infections and Antimicrobial Resistance, Imperial College London, Hammersmith Campus, Du Cane Road, London. W12 0NN. United Kingdom
| | - Sanjiv Sharma
- Department of Chemistry & Institute of Biomedical Engineering, Imperial College London, London, SW7 2AZ, United Kingdom
| | - Pantelis Georgiou
- Department of Electrical and Electronic Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, United Kingdom
| | - Alison Holmes
- National Institute for Health Research Health Protection Research Unit in Healthcare Associated Infections and Antimicrobial Resistance, Imperial College London, Hammersmith Campus, Du Cane Road, London. W12 0NN. United Kingdom
- Imperial College Healthcare NHS Trust, Hammersmith Hospital, Du Cane Road, Acton, W12 0NN, United Kingdom
| | - Anthony Cass
- Department of Chemistry & Institute of Biomedical Engineering, Imperial College London, London, SW7 2AZ, United Kingdom
| | - Danny O'Hare
- Department of Bioengineering, Imperial College London, London, SW7 2AZ, United Kingdom
| |
Collapse
|