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Zhang M, Yan S, Wang J, Zhong Y, Wang C, Zhang T, Xing D, Shao Y. Rational design of multifunctional hydrogels targeting the microenvironment of diabetic periodontitis. Int Immunopharmacol 2024; 138:112595. [PMID: 38950455 DOI: 10.1016/j.intimp.2024.112595] [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: 03/24/2024] [Revised: 06/24/2024] [Accepted: 06/27/2024] [Indexed: 07/03/2024]
Abstract
Periodontitis is a chronic inflammatory disease and is the primary contributor to adult tooth loss. Diabetes exacerbates periodontitis, accelerates periodontal bone resorption. Thus, effectively managing periodontitis in individuals with diabetes is a long-standing challenge. This review introduces the etiology and pathogenesis of periodontitis, and analyzes the bidirectional relationship between diabetes and periodontitis. In this review, we comprehensively summarize the four pathological microenvironments influenced by diabetic periodontitis: high glucose microenvironment, bacterial infection microenvironment, inflammatory microenvironment, and bone loss microenvironment. The hydrogel design strategies and latest research development tailored to the four microenvironments of diabetic periodontitis are mainly focused on. Finally, the challenges and potential solutions in the treatment of diabetic periodontitis are discussed. We believe this review will be helpful for researchers seeking novel avenues in the treatment of diabetic periodontitis.
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Affiliation(s)
- Miao Zhang
- The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, 266071, China; Cancer Institute, Qingdao University, Qingdao 266071, China
| | - Saisai Yan
- The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, 266071, China; Cancer Institute, Qingdao University, Qingdao 266071, China
| | - Jie Wang
- The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, 266071, China; Cancer Institute, Qingdao University, Qingdao 266071, China
| | - Yingjie Zhong
- The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, 266071, China; Cancer Institute, Qingdao University, Qingdao 266071, China
| | - Chao Wang
- The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, 266071, China; Cancer Institute, Qingdao University, Qingdao 266071, China
| | - Tingting Zhang
- The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, 266071, China; Cancer Institute, Qingdao University, Qingdao 266071, China
| | - Dongming Xing
- The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, 266071, China; Cancer Institute, Qingdao University, Qingdao 266071, China; School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Yingchun Shao
- The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, 266071, China; Cancer Institute, Qingdao University, Qingdao 266071, China.
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2
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Hari Krishna R, Chandraprabha MN, Mamatha GM, Mallappa M, Kundagol D, Manjunatha C. Non-enzymatic Catalytic Oxidation of Glucose and Dual Mode Sensing by Fluorescence/Electrochemical Methods Using MO–GO Composites (MO = ZnO, CuO, NiO and Co3O4). Top Catal 2022. [DOI: 10.1007/s11244-022-01588-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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3
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Prakash J, Parveen A, Mishra YK, Kaushik A. Nanotechnology-assisted liquid crystals-based biosensors: Towards fundamental to advanced applications. Biosens Bioelectron 2020; 168:112562. [DOI: 10.1016/j.bios.2020.112562] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Revised: 06/09/2020] [Accepted: 08/24/2020] [Indexed: 02/06/2023]
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Stark C, Carvajal Arrieta CA, Behroozian R, Redmer B, Fiedler F, Müller S. Broadband polarimetric glucose determination in protein containing media using characteristic optical rotatory dispersion. BIOMEDICAL OPTICS EXPRESS 2019; 10:6340-6350. [PMID: 31853403 PMCID: PMC6913393 DOI: 10.1364/boe.10.006340] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Revised: 10/22/2019] [Accepted: 10/22/2019] [Indexed: 05/03/2023]
Abstract
One of the major challenges during polarimetric determination of glucose concentration is the spectral superposition with other optically active molecules, especially proteins like albumin. Since each of those substances has a characteristic optical rotatory dispersion (ORD), we developed a broadband polarimeter setup to distinguish between glucose and albumin. A partial least squares (PLS) regression with 5 components was applied to the polarimeter signal in the wavelength range of 380 - 680 nm . To verify the efficacy of the proposed method, different glucose levels of 0 - 500 mg/dl were spiked with varying albumin concentrations up to 1000 mg/dl . A standard error of prediction of ± 16.0 mg/dl was achieved compared to ± 128.3 mg/dl using a two-wavelength system with 532 nm and 635 nm under the same conditions.
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Affiliation(s)
- Christian Stark
- Lübeck University of Applied Sciences, Medical Sensors and Devices Laboratory, Mönkhofer Weg 239, Lübeck 23562, Germany
- University of Lübeck, Graduate School for Computing in Medicine and Life Sciences, Ratzeburger Allee 160, Lübeck 23562, Germany
| | - Cesar Andres Carvajal Arrieta
- Lübeck University of Applied Sciences, Medical Sensors and Devices Laboratory, Mönkhofer Weg 239, Lübeck 23562, Germany
| | - Reza Behroozian
- Lübeck University of Applied Sciences, Medical Sensors and Devices Laboratory, Mönkhofer Weg 239, Lübeck 23562, Germany
- University of Lübeck, Graduate School for Computing in Medicine and Life Sciences, Ratzeburger Allee 160, Lübeck 23562, Germany
| | - Benjamin Redmer
- Lübeck University of Applied Sciences, Medical Sensors and Devices Laboratory, Mönkhofer Weg 239, Lübeck 23562, Germany
- University of Lübeck, Graduate School for Computing in Medicine and Life Sciences, Ratzeburger Allee 160, Lübeck 23562, Germany
| | - Felix Fiedler
- Lübeck University of Applied Sciences, Medical Sensors and Devices Laboratory, Mönkhofer Weg 239, Lübeck 23562, Germany
- University of Lübeck, Graduate School for Computing in Medicine and Life Sciences, Ratzeburger Allee 160, Lübeck 23562, Germany
| | - Stefan Müller
- Lübeck University of Applied Sciences, Medical Sensors and Devices Laboratory, Mönkhofer Weg 239, Lübeck 23562, Germany
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Esposito R, Delfino I, Portaccio M, Iannuzzi C, Lepore M. An insight into pH-induced changes in FAD conformational structure by means of time-resolved fluorescence and circular dichroism. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2019; 48:395-403. [PMID: 31053922 DOI: 10.1007/s00249-019-01369-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Revised: 04/02/2019] [Accepted: 04/25/2019] [Indexed: 11/26/2022]
Abstract
Optical properties of flavin adenine dinucleotide (FAD) moiety are widely used nowadays for biotechnological applications. Given the fundamental role played by FAD, additional structural information about this enzymatic cofactor can be extremely useful in order to obtain a greater insight into its functional role in proteins. For this purpose, we have investigated FAD behaviour in aqueous solutions at different pH values by a novel approach based on the combined use of time-resolved fluorescence and circular dichroism spectroscopies. The results showed that pH strongly affects time-resolved fluorescence emission and the analysis allowed us to detect a three-component decay for FAD in aqueous solution with pH-depending lifetimes and relative amplitudes. Circular dichroism data were analyzed by a multi-Gaussian fitting procedure and the trends of properly chosen parameters confirmed pH-depending changes. The comparison between the results obtained by these two optical techniques allowed us to improve the significance of the outcome of circular dichroism. This combined approach may provide a useful tool for biotechnological investigation.
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Affiliation(s)
- Rosario Esposito
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione industriale, Università Federico II, P.le Tecchio 80, 80125, Naples, Italy
| | - Ines Delfino
- Dipartimento di Scienze Ecologiche e Biologiche, Università della Tuscia, Largo dell'Università snc, 01100, Viterbo, Italy.
| | - Marianna Portaccio
- Dipartimento di Medicina Sperimentale, Università della Campania "Luigi Vanvitelli", Via S.M. Costantinopoli 16, 80134, Naples, Italy
| | - Clara Iannuzzi
- Dipartimento di Medicina di Precisione, Università della Campania "Luigi Vanvitelli", Via L. De Crecchio 7, 80138, Naples, Italy
| | - Maria Lepore
- Dipartimento di Medicina Sperimentale, Università della Campania "Luigi Vanvitelli", Via S.M. Costantinopoli 16, 80134, Naples, Italy
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Glucose Oxidase-Based Glucose-Sensitive Drug Delivery for Diabetes Treatment. Polymers (Basel) 2017; 9:polym9070255. [PMID: 30970930 PMCID: PMC6432078 DOI: 10.3390/polym9070255] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Revised: 06/19/2017] [Accepted: 06/25/2017] [Indexed: 11/21/2022] Open
Abstract
The glucose-sensitive drug delivery systems based on glucose oxidase (GOD), which exhibit highly promising applications in diabetes therapy, have attracted much more interest in recent years. The self-regulated drug delivery systems regulate drug release by glucose concentration automatically and continuously to control the blood glucose level (BGL) in normoglycemic state. This review covers the recent advances at the developments of GOD-based glucose-sensitive drug delivery systems and their in vivo applications for diabetes treatment. The applications of GOD-immobilized platforms, such as self-assembly layer-by-layer (LbL) films and polymer vesicles, cross-linking hydrogels and microgels, hybrid mesoporous silica nanoparticles, and microdevices fabricated with insulin reservoirs have been surveyed. The glucose-sensitive drug delivery systems based on GOD are expected to be a typical candidate for smart platforms for potential applications in diabetes therapy.
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Galbán J, Sanz-Vicente I, Navarro J, de Marcos S. The intrinsic fluorescence of FAD and its application in analytical chemistry: a review. Methods Appl Fluoresc 2016; 4:042005. [DOI: 10.1088/2050-6120/4/4/042005] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Zhao Y, Cao L, Li L, Cheng W, Xu L, Ping X, Pan L, Shi Y. Conducting Polymers and Their Applications in Diabetes Management. SENSORS (BASEL, SWITZERLAND) 2016; 16:E1787. [PMID: 27792179 PMCID: PMC5134446 DOI: 10.3390/s16111787] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/03/2016] [Revised: 10/10/2016] [Accepted: 10/24/2016] [Indexed: 02/06/2023]
Abstract
Advances in conducting polymers (CPs) have promoted the development of diabetic monitoring and treatment, which is of great significance in human healthcare and modern medicine. CPs are special polymers with physical and electrochemical features resembling metals, inorganic semiconductors and non-conducting polymers. To improve and extend their properties, the fabrication of CPs and CP composites has attracted intensive attention in recent decades. Some CPs are biocompatible and suitable for biomedical use. Thus, the intriguing properties of CPs make wearable, noninvasive, continuous diabetes managing devices and other potential applications in diabetes possible in the near future. To highlight the recent advances of CPs and their derived materials (especially in conducting polymer hydrogels), here we discuss their fabrication and characterization, review the current state-of-the-art research in diabetes management based on these materials and describe current challenges as well as future potential research directions.
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Affiliation(s)
- Yu Zhao
- School of Electronic Science and Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
| | - Luyao Cao
- School of Electronic Science and Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
| | - Lanlan Li
- School of Electronic Science and Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
| | - Wen Cheng
- School of Electronic Science and Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
| | - Liangliang Xu
- Nanjing Foreign Language School, Nanjing 210008, China.
| | - Xinyu Ping
- Nanjing Foreign Language School, Nanjing 210008, China.
| | - Lijia Pan
- School of Electronic Science and Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
| | - Yi Shi
- School of Electronic Science and Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
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Esposito R, Mensitieri G, de Nicola S. Improved maximum entropy method for the analysis of fluorescence spectroscopy data: evaluating zero-time shift and assessing its effect on the determination of fluorescence lifetimes. Analyst 2016; 140:8138-47. [PMID: 26541293 DOI: 10.1039/c5an01811k] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new algorithm based on the Maximum Entropy Method (MEM) is proposed for recovering both the lifetime distribution and the zero-time shift from time-resolved fluorescence decay intensities. The developed algorithm allows the analysis of complex time decays through an iterative scheme based on entropy maximization and the Brent method to determine the minimum of the reduced chi-squared value as a function of the zero-time shift. The accuracy of this algorithm has been assessed through comparisons with simulated fluorescence decays both of multi-exponential and broad lifetime distributions for different values of the zero-time shift. The method is capable of recovering the zero-time shift with an accuracy greater than 0.2% over a time range of 2000 ps. The center and the width of the lifetime distributions are retrieved with relative discrepancies that are lower than 0.1% and 1% for the multi-exponential and continuous lifetime distributions, respectively. The MEM algorithm is experimentally validated by applying the method to fluorescence measurements of the time decays of the flavin adenine dinucleotide (FAD).
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Affiliation(s)
- Rosario Esposito
- Dept. of Chemical, Materials and Production Engineering, University of Naples Federico II, P.le Tecchio 80, 80125 Naples, Italy.
| | - Giuseppe Mensitieri
- Dept. of Chemical, Materials and Production Engineering, University of Naples Federico II, P.le Tecchio 80, 80125 Naples, Italy.
| | - Sergio de Nicola
- CNR-SPIN Napoli, Complesso Universitario di Monte Sant'Angelo, via Cinthia, 80126 Napoli, Italy
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Pospíšilová M, Kuncová G, Trögl J. Fiber-Optic Chemical Sensors and Fiber-Optic Bio-Sensors. SENSORS (BASEL, SWITZERLAND) 2015; 15:25208-59. [PMID: 26437407 PMCID: PMC4634516 DOI: 10.3390/s151025208] [Citation(s) in RCA: 126] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/26/2015] [Revised: 09/08/2015] [Accepted: 09/14/2015] [Indexed: 02/06/2023]
Abstract
This review summarizes principles and current stage of development of fiber-optic chemical sensors (FOCS) and biosensors (FOBS). Fiber optic sensor (FOS) systems use the ability of optical fibers (OF) to guide the light in the spectral range from ultraviolet (UV) (180 nm) up to middle infrared (IR) (10 μm) and modulation of guided light by the parameters of the surrounding environment of the OF core. The introduction of OF in the sensor systems has brought advantages such as measurement in flammable and explosive environments, immunity to electrical noises, miniaturization, geometrical flexibility, measurement of small sample volumes, remote sensing in inaccessible sites or harsh environments and multi-sensing. The review comprises briefly the theory of OF elaborated for sensors, techniques of fabrications and analytical results reached with fiber-optic chemical and biological sensors.
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Affiliation(s)
- Marie Pospíšilová
- Czech Technical University, Faculty of Biomedical Engeneering, Nám. Sítná 3105, 27201 Kladno, Czech Republic.
| | - Gabriela Kuncová
- Institute of Chemical Process Fundamentals, ASCR, Rozvojová 135, 16500 Prague, Czech Republic.
| | - Josef Trögl
- Faculty of Environment, Jan Evangelista Purkyně University in Ústí nad Labem, KrálovaVýšina 3132/7, 40096 Ústí nad Labem, Czech Republic.
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Yung KY, Zhan Z, Titus AH, Baker GA, Bright FV. Ratiometric, filter-free optical sensor based on a complementary metal oxide semiconductor buried double junction photodiode. Anal Chim Acta 2015; 884:77-82. [PMID: 26073812 DOI: 10.1016/j.aca.2015.05.021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Revised: 04/21/2015] [Accepted: 05/11/2015] [Indexed: 10/23/2022]
Abstract
We report a complementary metal oxide semiconductor integrated circuit (CMOS IC) with a buried double junction (BDJ) photodiode that (i) provides a real-time output signal that is related to the intensity ratio at two emission wavelengths and (ii) simultaneously eliminates the need for an optical filter to block Rayleigh scatter. We demonstrate the BDJ platform performance for gaseous NH3 and aqueous pH detection. We also compare the BDJ performance to parallel results obtained by using a slew scanned fluorimeter (SSF). The BDJ results are functionally equivalent to the SSF results without the need for any wavelength filtering or monochromators and the BDJ platform is not prone to errors associated with source intensity fluctuations or sensor signal drift.
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Affiliation(s)
- Ka Yi Yung
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
| | - Zhiyong Zhan
- Department of Biomedical Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
| | - Albert H Titus
- Department of Biomedical Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
| | - Gary A Baker
- Department of Chemistry, University of Missouri, Columbia, MO 65211-7600, USA
| | - Frank V Bright
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA.
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Zscharnack K, Kreisig T, Prasse AA, Zuchner T. A homogeneous assay principle for universal substrate quantification via hydrogen peroxide producing enzymes. Anal Chim Acta 2015; 854:145-52. [PMID: 25479878 DOI: 10.1016/j.aca.2014.11.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Revised: 10/27/2014] [Accepted: 11/07/2014] [Indexed: 11/24/2022]
Abstract
H2O2 is a widely occurring molecule which is also a byproduct of a number of enzymatic reactions. It can therefore be used to quantify the corresponding enzymatic substrates. In this study, the time-resolved fluorescence emission of a previously described complex consisting of phthalic acid and terbium (III) ions (PATb) is used for H2O2 detection. In detail, glucose oxidase and choline oxidase convert glucose and choline, respectively, to generate H2O2 which acts as a quencher for the PATb complex. The response time of the PATb complex toward H2O2 is immediate and the assay time only depends on the conversion rate of the enzymes involved. The PATb assay quantifies glucose in a linear range of 0.02-10 mmol L(-1), and choline from 1.56 to 100 μmol L(-1) with a detection limit of 20 μmol L(-1) for glucose and 1.56 μmol L(-1) for choline. Both biomolecules glucose and choline could be detected without pretreatment with good precision and reproducibility in human serum samples and infant formula, respectively. Furthermore, it is shown that the detected glucose concentrations by the PATb system agree with the results of a commercially available assay. In principle, the PATb system is a universal and versatile tool for the quantification of any substrate and enzyme reaction where H2O2 is involved.
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Affiliation(s)
- Kristin Zscharnack
- Institute of Bioanalytical Chemistry, Faculty of Chemistry and Mineralogy, Universität Leipzig, Deutscher Platz 5, 04103 Leipzig, Germany
| | - Thomas Kreisig
- Institute of Bioanalytical Chemistry, Faculty of Chemistry and Mineralogy, Universität Leipzig, Deutscher Platz 5, 04103 Leipzig, Germany
| | - Agneta A Prasse
- Institute of Bioanalytical Chemistry, Faculty of Chemistry and Mineralogy, Universität Leipzig, Deutscher Platz 5, 04103 Leipzig, Germany
| | - Thole Zuchner
- Institute of Bioanalytical Chemistry, Faculty of Chemistry and Mineralogy, Universität Leipzig, Deutscher Platz 5, 04103 Leipzig, Germany; Center for Biotechnology and Biomedicine, Universität Leipzig, Deutscher Platz 5, 04103 Leipzig, Germany.
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13
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Aloraefy M, Pfefer TJ, Ramella-Roman JC, Sapsford KE. In vitro evaluation of fluorescence glucose biosensor response. SENSORS 2014; 14:12127-48. [PMID: 25006996 PMCID: PMC4168472 DOI: 10.3390/s140712127] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Revised: 06/10/2014] [Accepted: 07/03/2014] [Indexed: 11/25/2022]
Abstract
Rapid, accurate, and minimally-invasive glucose biosensors based on Förster Resonance Energy Transfer (FRET) for glucose measurement have the potential to enhance diabetes control. However, a standard set of in vitro approaches for evaluating optical glucose biosensor response under controlled conditions would facilitate technological innovation and clinical translation. Towards this end, we have identified key characteristics and response test methods, fabricated FRET-based glucose biosensors, and characterized biosensor performance using these test methods. The biosensors were based on competitive binding between dextran and glucose to concanavalin A and incorporated long-wavelength fluorescence dye pairs. Testing characteristics included spectral response, linearity, sensitivity, limit of detection, kinetic response, reversibility, stability, precision, and accuracy. The biosensor demonstrated a fluorescence change of 45% in the presence of 400 mg/dL glucose, a mean absolute relative difference of less than 11%, a limit of detection of 25 mg/dL, a response time of 15 min, and a decay in fluorescence intensity of 72% over 30 days. The battery of tests presented here for objective, quantitative in vitro evaluation of FRET glucose biosensors performance have the potential to form the basis of future consensus standards. By implementing these test methods for a long-visible-wavelength biosensor, we were able to demonstrate strengths and weaknesses with a new level of thoroughness and rigor.
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Affiliation(s)
- Mamdouh Aloraefy
- Center for Devices and Radiological Health, Food and Drug Administration, Silver Spring, MD 20993, USA.
| | - T Joshua Pfefer
- Center for Devices and Radiological Health, Food and Drug Administration, Silver Spring, MD 20993, USA.
| | - Jessica C Ramella-Roman
- Department of Biomedical Engineering and Herbert Wertheim College of Medicine, Florida International University, Miami, FL 33174, USA.
| | - Kim E Sapsford
- Center for Devices and Radiological Health, Food and Drug Administration, Silver Spring, MD 20993, USA.
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Kostov Y, Ge X, Rao G, Tolosa L. Portable system for the detection of micromolar concentrations of glucose. MEASUREMENT SCIENCE & TECHNOLOGY 2014; 25:025701. [PMID: 24587594 PMCID: PMC3934490 DOI: 10.1088/0957-0233/25/2/025701] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Glucose in non-invasively collected biofluids is generally in the micromolar range and thus, requires sensing methodologies capable of measuring glucose at these levels. Here, we present a small fluorometer system that can quantify glucose in the range of 0-5 μM with resolution of ~0.07 μM. It relies on the glucose binding protein (GBP) fluorescently labeled with two fluorophores. Fluorescence signals from the dual-labeled GBP are utilized in a ratiometric mode, making the measurements insensitive to variations in protein concentration and other systematic errors. Fluorescence is quantified by a miniature, dedicated ratiometric fluorometer that is powered via USB. Concentration is calculated using an ultra-mobile personal computer (UMPC). The whole system is designed to be pocket sized suitable for point-of-care or bedside applications. Test results suggest that the system is a promising tool for accurate measurements of low glucose concentrations (0.1-10 μM) in biological samples.
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Affiliation(s)
- Yordan Kostov
- Center for Advanced Sensor Technology, Department of Chemical, Biochemical and Environmental Engineering, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore MD, 21250
| | - Xudong Ge
- Center for Advanced Sensor Technology, Department of Chemical, Biochemical and Environmental Engineering, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore MD, 21250
| | - Govind Rao
- Center for Advanced Sensor Technology, Department of Chemical, Biochemical and Environmental Engineering, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore MD, 21250
| | - Leah Tolosa
- Center for Advanced Sensor Technology, Department of Chemical, Biochemical and Environmental Engineering, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore MD, 21250
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15
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Time-resolved flavin adenine dinucleotide fluorescence study of the interaction between immobilized glucose oxidase and glucose. J Fluoresc 2013; 23:947-55. [PMID: 23576005 DOI: 10.1007/s10895-013-1220-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2013] [Accepted: 04/01/2013] [Indexed: 10/27/2022]
Abstract
Time-resolved fluorescence experiments have shown that flavin adenine dinucleotide (FAD) fluorescence emission of sol-gel immobilized glucose oxidase (GOD) exhibits a three-exponential decaying behaviour characterized by long- (about 2.0-3.0 ns), intermediate- (about 300 ps) and short- (less than 10 ps) lifetime, each one being characteristic of a peculiar conformational state of the FAD structure. In the present work time-resolved fluorescence is used to monitor FAD signals in the time interval immediately following the addition of glucose at various concentrations in order to detect the conformational changes occurring during the interaction between sol-gel immobilized GOD and glucose. The analysis of time-dependent fluorescence emission signal has shown that the FAD conformational state changes during the process from a configuration with a prevalence of the state characterized by the long lifetime to a configuration with increased contribution from the process with the intermediate lifetime. The time needed to complete this configuration change decreases with the concentration of added glucose. The results here reported indicate that time-resoled fluorescence can be extremely useful for a better understanding of solid phase biocatalysis that is particularly important in light of their clinical and biotechnological applications.
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Delfino I, Portaccio M, Ventura BD, Mita D, Lepore M. Enzyme distribution and secondary structure of sol–gel immobilized glucose oxidase by micro-attenuated total reflection FT-IR spectroscopy. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2013; 33:304-10. [DOI: 10.1016/j.msec.2012.08.044] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2012] [Revised: 08/10/2012] [Accepted: 08/29/2012] [Indexed: 11/27/2022]
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17
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Reagentless fluorescent biosensors based on proteins for continuous monitoring systems. Anal Bioanal Chem 2012; 402:3039-54. [DOI: 10.1007/s00216-012-5715-2] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2011] [Accepted: 01/04/2012] [Indexed: 12/23/2022]
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18
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