Article
Chemistry, Analytical
Ming-Hao Cheng, Adam J. Chicco, Daniel Ball, Thomas W. Chen
Summary: Mitochondria are vital for oxygen consumption and energy metabolism in cells, but also produce reactive oxygen species (ROS) with various effects. This paper presents a sensitive multi-sensor device capable of measuring ROS production and oxygen consumption rate (OCR) simultaneously in biological samples. The device has been validated in scarce biological samples and shows potential utility in studying cellular metabolism and mitochondrial function.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Multidisciplinary
Sherin Rison, Rijo Rajeev, Vinay S. Bhat, Agnus T. Mathews, Anitha Varghese, Gurumurthy Hegde
Summary: Electrochemically deposited ZnO nanoparticles on a pencil graphite electrode coated with graphene provide a highly conductive and selective electrochemical sensing electrode for cortisol estimation. Various spectroscopic and microscopic techniques were used for surface morphological analysis, while XRD and FTIR were employed for structural characterization. The DPV analysis showed a linear range of 5 x 10(-10) M - 115 x 10(-10) M with a low limit of detection value of 0.15 nM, demonstrating excellent functionality for salivary cortisol determination at low concentrations.
Article
Chemistry, Multidisciplinary
Sebastian Urban, Benedikt J. Deschner, Laura L. Trinkies, Jochen Kieninger, Manfred Kraut, Roland Dittmeyer, Gerald A. Urban, Andreas Weltin
Summary: Determining the local concentrations of analytes in state-of-the-art microreactors is crucial for optimized and safe processes. Electrochemical microsensors can provide unique information on the reaction kinetics in microreactors, with a new chronoamperometric approach allowing selective detection of dissolved gases hydrogen and oxygen, as well as their reaction product hydrogen peroxide. This approach paves the way for online process control by mapping the distribution of analytes inside a multiphase membrane microreactor.
Article
Chemistry, Analytical
B. Patella, M. Buscetta, S. Di Vincenzo, M. Ferraro, G. Aiello, C. Sunseri, E. Pace, R. Inguanta, C. Cipollina
Summary: Increased oxidative burden is linked to the pathogenesis of inflammatory diseases, with macrophages playing a role in ROS generation. A sensor for H2O2 detection released by cells in culture supernatants was evaluated for sensitivity and selectivity, and its results were consistent with those obtained using flow cytometry. It has the potential to be used for real-time monitoring of oxidative stress without impacting cell viability.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Engineering, Environmental
Zaiyong Yang, Zengxi Wei, Shunxin Zhou, Bo Bao, Shuangliang Zhao, Fuzhong Gong
Summary: This study reports a new continuous DSHP process by constructing a feasible microreactor upon microfluidic chip under ambient condition, which achieved continuous production of H2O2 with high concentration. The study provides a promising on-site route to produce H2O2 in a green, safe yet ready-to-use process.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Analytical
Liuyi Jiang, Yanan Zhao, Peng Zhao, Shiying Zhou, Zhong Ji, Danqun Huo, Daidi Zhong, Changjun Hou
Summary: In this study, CuCo2O4/rGO composites with excellent electrocatalytic performance were successfully synthesized and used for real-time detection of H2O2 released from living cells, demonstrating their potential application in monitoring critical pathological processes in living cells.
MICROCHEMICAL JOURNAL
(2021)
Article
Chemistry, Analytical
Siyi Chen, Yixuan Xie, Xiangjian Guo, Duanping Sun
Summary: In this study, metal-organic frameworks (MOFs) were used as supporting materials to enhance the electrocatalytic performance of metal nanoparticles. A self-supporting electrochemical sensor was developed by electrodeposition of metal nanoparticles on zinc-based MOFs. The results showed that silver nanoparticles modified two-dimensional MOFs exhibited better electrocatalytic activity, providing a promising platform for detecting biomarkers and drug evaluation.
MICROCHEMICAL JOURNAL
(2022)
Article
Engineering, Environmental
Padraig McDonagh, Matthew McCole, Nathan Skillen, Peter K. J. Robertson, Denis McCrudden
Summary: This study presents a novel approach using low-cost and sustainable electrochemical sensors to monitor the photocatalytic generation of hydrogen peroxide. The sensor exhibits high accuracy and selectivity, and can be regenerated multiple times, leading to a significant decrease in analysis cost and potential waste material. This approach offers a more economical and sustainable alternative to current methods.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Biophysics
Asit Kumar Panda, Keerthi Murugan, Rajalakshmi Sakthivel, Lu-Yin Lin, Yeh-Fang Duann, Udesh Dhawan, Xinke Liu, Jr-Hau He, Ren-Jei Chung
Summary: The study presents the design and fabrication of enzyme-free sensor using N-doped graphene quantum dots (N-GQDs)-decorated tin sulfide nanosheets (SnS2) for in situ monitoring of H2O2 secreted by human breast cancer cells. The N-GQDs@SnS2-based sensing platform shows excellent sensing ability with a wide detection range and stability, and has been successfully applied for real-time monitoring of H2O2 in various samples. This research opens up new possibilities for designing efficient non-enzymatic electrochemical sensors using a simple method for biomolecule detection.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2023)
Article
Chemistry, Analytical
Hao Yin, YaHao Shi, YongPing Dong, XiangFeng Chu
Summary: CuGa2O4 nanoparticles were synthesized using hydrothermal-calcination technique and exhibited significant electrocatalytic effects for the reduction of H2O2 and oxidation of glucose. Under optimal conditions, sensitive detection of H2O2 and glucose was achieved, showing linear changes in concentration with electrochemical signals. This promising nanoparticle could improve non-enzymatic glucose sensors.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Chang Liu, Zixun Yu, Fangxin She, Jiaxiang Chen, Fangzhou Liu, Jiangtao Qu, Julie M. Cairney, Chongchong Wu, Kailong Liu, Weijie Yang, Huiling Zheng, Yuan Chen, Hao Li, Li Wei
Summary: By constructing heterogeneous molecular catalysts using cobalt porphyrins and carbon nanotubes, the catalytic properties and activity were successfully modulated, resulting in sustainable production of hydrogen peroxide with high selectivity and activity.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Electrochemistry
Caelen M. M. Clark, Brandon M. M. Ruszala, Rachel M. M. Anderson, Matthew J. J. Strom, Mark T. T. Ehrensberger
Summary: This study characterized the electrochemical generation of H2O2 on titanium and 316L stainless steel using Rotating Ring-Disk Electrode techniques and Scanning Electrochemical Microscopy methods.
JOURNAL OF APPLIED ELECTROCHEMISTRY
(2023)
Review
Chemistry, Physical
Aaditya S. Deshpande, Wayne Muraoka, Silvana Andreescu
Summary: Electrochemical sensors are effective in detecting reactive oxygen and nitrogen species in biological processes. Recent developments in microelectrode and electrode materials show promise in studying drug efficacy, mitochondrial distress, and endothelial dysfunction. Challenges and opportunities in applying this methodology to study pathophysiology associated with various diseases are discussed.
CURRENT OPINION IN ELECTROCHEMISTRY
(2021)
Article
Engineering, Chemical
Hailing Zhao, Saier Liu, Minjing Shang, Yuanhai Su
Summary: The direct synthesis of phenol from benzene and hydrogen peroxide was investigated in a microreactor, with focus on the effects of process parameters on reaction performance. A novel method was proposed to calculate the actual residence time for the reaction process, especially at high temperatures. The activation energies for phenol synthesis, hydrogen peroxide decomposition, and p-benzoquinone formation were also determined in the study.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Chemistry, Analytical
Yu Luo, Ruizhi Lin, Yimei Zuo, Ziyi Zhang, Yi Zhuo, Ming Lu, Shu Chen, Hui Gu
Summary: In this study, an electrochemical microsensor was designed for the selective and accurate measurement of hydrogen peroxide (H2O2) in the living brain. By tuning the structure of the probe and using a stable internal reference material, the sensor was able to track the concentration of H2O2 in real-time. The sensor was successfully applied to measure H2O2 in the Parkinson's disease mouse brain. This research provides insights into the role and impact of H2O2 in Parkinson's disease.
ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Sebastian Urban, Benedikt J. Deschner, Laura L. Trinkies, Jochen Kieninger, Manfred Kraut, Roland Dittmeyer, Gerald A. Urban, Andreas Weltin
Summary: Determining the local concentrations of analytes in state-of-the-art microreactors is crucial for optimized and safe processes. Electrochemical microsensors can provide unique information on the reaction kinetics in microreactors, with a new chronoamperometric approach allowing selective detection of dissolved gases hydrogen and oxygen, as well as their reaction product hydrogen peroxide. This approach paves the way for online process control by mapping the distribution of analytes inside a multiphase membrane microreactor.
Article
Engineering, Chemical
Laura L. Trinkies, Andrea Duell, Benedikt J. Deschner, Alexander Stroh, Manfred Kraut, Roland Dittmeyer
Summary: A microstructured membrane reactor was developed to address the safety and productivity challenges of direct hydrogen peroxide synthesis. Using a custom OpenFOAM(R) model, researchers studied the impact of catalyst-coated static mixers with different geometries, finding that the custom fluid guiding elements outperform commercial static mixers under relevant flow conditions.
CHEMIE INGENIEUR TECHNIK
(2021)
Article
Multidisciplinary Sciences
Philip Pietrek, Manfred Kraut, Roland Dittmeyer
Summary: Immobilized multi-enzyme cascades in microfluidic devices, particularly in continuous flow reactors, offer great potential due to reusability and control of reaction conditions. However, maximizing this potential requires detailed knowledge of the system. Computational optimization based on physical and chemical processes can enhance performance and maximize techno-economic performance through optimized reactor feed concentrations and enzyme ratios.
Review
Engineering, Biomedical
Andreas Weltin, Jochen Kieninger
Summary: Electrochemical methods play a crucial role in neural engineering, but are currently underutilized. Research could benefit from more consistent and target-oriented electrochemical methodology and instrumentation. Standardization, consistency, and comparability will be key in translating microtechnology into biomedical and clinical applications.
JOURNAL OF NEURAL ENGINEERING
(2021)
Article
Engineering, Chemical
Laura L. Trinkies, Andrea Duell, Jinju Zhang, Sebastian Urban, Benedikt J. Deschner, Manfred Kraut, Bradley P. Ladewig, Andreas Weltin, Jochen Kieninger, Roland Dittmeyer
Summary: Microstructured membrane reactors provide a promising approach to address productivity and safety challenges in direct hydrogen peroxide synthesis. Various mass transport processes occur in this complex system, with experimental investigation into saturation and desaturation behaviors of the liquid reaction medium with gaseous reactants. The study also looks at the permeances of the PDMS membrane to hydrogen and oxygen at different pressures, using mathematical modeling to simulate the results and highlighting the need for constant gas channel flushing for safety reasons.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Engineering, Biomedical
Moritz Doering, Jochen Kieninger, Gerald A. Urban, Andreas Weltin
Summary: This study investigates the degradation of platinum microelectrodes in neutral pH and chloride-containing electrolytes using continuous electrochemical methods. The findings show that electrode degradation is mainly driven by the formation and removal of platinum surface oxide. These results provide valuable information on the stability of platinum microelectrodes in biomedical applications.
JOURNAL OF NEURAL ENGINEERING
(2022)
Article
Biochemical Research Methods
Johannes Dornhof, Jochen Kieninger, Harshini Muralidharan, Jochen Maurer, Gerald A. Urban, Andreas Weltin
Summary: The study introduced a microfluidic organ-on-chip platform for matrix-based, heterogeneous 3D cell cultures with integrated electrochemical sensors for metabolites. The system allowed precise control of culture conditions and real-time multi-analyte metabolite monitoring, demonstrating potential applications in personalized medicine and cancer research.
Article
Biophysics
Andreas Weltin, Jochen Kieninger, Gerald A. Urban, Sarah Buchholz, Susan Arndt, Nicole Rosskothen-Kuhl
Summary: This study developed an electrochemical method to turn the platinum stimulation microelectrodes of cochlear implants into electrochemical sensors. In vitro and in vivo experiments demonstrated the effectiveness and stability of this method. This research is significant for advancing implant functionality, long-term monitoring, and investigating electrode degradation in cochlear implant patients in situ.
BIOSENSORS & BIOELECTRONICS
(2022)
Article
Engineering, Chemical
Sara Claramunt, Paul V. Schell, Manfred Kraut, Bruno F. Stengel, Christof F. Kuesters, Roland Dittmeyer
Summary: Micro-process engineering can intensify the polycondensation reaction of polydextrose, and the good heat transfer characteristics of the internal inserts allow for continuous evaporation of water and increased product yield.
Article
Engineering, Biomedical
Moritz Doering, Jochen Kieninger, Julian Kuebler, Ulrich G. Hofmann, Stefan J. Rupitsch, Gerald A. Urban, Andreas Weltin
Summary: This study investigates the electrochemical characteristics of electrodes during current-controlled neurostimulation, revealing the influence of surface status and electrochemical processes on potential traces. The findings emphasize the importance of understanding electrode state and processes to ensure safe and effective stimulation.
JOURNAL OF NEURAL ENGINEERING
(2023)
Article
Chemistry, Analytical
David Bill, Mark Jasper, Andreas Weltin, Gerald A. Urban, Stefan J. Rupitsch, Jochen Kieninger
Summary: Embedded potentiostats enable precise and advanced electrochemical measurements in decentralized applications such as IoT, remote environmental monitoring, and biomedical point-of-care. The FreiStat, based on Analog Devices' AD5941 potentiostat circuit with custom firmware, demonstrated comparable analytical performance to benchtop devices at a significantly lower cost, smaller size, and lower power consumption. Its applicability in a typical IoT scenario was shown through decentralized corrosion analysis using the IBM Cloud. The development of an open-source software framework facilitates the integration of electrochemical instrumentation into applications utilizing machine learning and other artificial intelligence, enabling analytical chemistry to be applied in increasingly important, widespread, and decentralized applications.
ANALYTICAL CHEMISTRY
(2023)
Article
Biochemical Research Methods
Johannes Dornhof, Viktoria Zieger, Jochen Kieninger, Daniel Frejek, Roland Zengerle, Gerald A. Urban, Sabrina Kartmann, Andreas Weltin
Summary: Three-dimensional cell agglomerates are increasingly important in biomedicine, providing in vitro models for tissue functions and having applications in cancer research. This study combines state-of-the-art bioprinting techniques with 3D cell culture monitoring, demonstrating the automation and integration of sensors and drug delivery in 3D cell culture and organ-on-chip experiments.
Article
Chemistry, Analytical
Mengmeng Guo, Na Luo, Yueling Bai, Zhenggang Xue, Qingmin Hu, Jiaqiang Xu
Summary: A porous heterostructure WO3-C/In2O3 was designed and prepared for a miniature H2 sensor, which showed higher response value, lower operating temperature, fast response-recovery speed, and low limit of detection.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Feng Hu, Hui Hu, Yuting Li, Xiaohui Wang, Xiaowen Shi
Summary: Arsenic contamination in water bodies is a significant health risk. This study developed a chitosan-catechol modified electrode for rapid and accurate detection of trace amounts of arsenic. The modified electrode demonstrated good detection capability and resistance to ionic interference, making it suitable for in situ detection.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Yantao Zhang, Qian Liu, Tao Tian, Chunhua Xu, Pengli Yang, Lianju Ma, Yi Hou, Hui Zhou, Yongjun Gan
Summary: In this study, a lysosome-targeting buffering fluorogenic probe (Lyso-BFP) was designed and synthesized, demonstrating excellent photostability, pH specificity, and responsiveness to lysosomal acidification in living cells. The performance of Lyso-BFP in pH sensing was attributed to the inhibition of the photo-induced electron transfer process. Lyso-BFP allowed for wash-free imaging and long-term real-time monitoring of lysosome pH changes based on its off-on fluorescence behavior and buffer strategy.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Wei Cai, Wenbo Sun, Jiayue Wang, Xiaokui Huo, Xudong Cao, Xiangge Tian, Xiaochi Ma, Lei Feng
Summary: In this study, a near-infrared fluorescent probe HCBG was developed for imaging of alpha-GLC. HCBG exhibited excellent selectivity and sensitivity towards alpha-GLC in complex bio-samples, and showed good cell permeability for in situ real-time imaging. Through the high-throughput screening system established by HCBG, a natural alpha-GLC inhibitor was successfully isolated and identified. This study provides a novel fluorescence visualization tool for discovering and exploring the biological functions of diabetes-related gut microbiota, and a high-throughput screening approach for alpha-GLC inhibitor.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Trey W. Pittman, Xi Zhang, Chamindie Punyadeera, Charles S. Henry
Summary: Heart failure is a growing epidemic and a significant clinical and public health problem. Researchers have developed a portable and affordable diagnostic device for heart failure that can be used at the point-of-care, providing a valid alternative to current diagnostics approaches.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Anders O. Tjell, Barbara Jud, Roland Schaller-Ammann, Torsten Mayr
Summary: An optical hydrogen peroxide sensor based on catalytic degradation and the detection of produced oxygen is presented. The sensor offers higher resolution and better sensitivity at lower H2O2 concentrations. By removing O2 from the sample solution, a more sensitive O2 sensor can be used for measurement. The sensor has been successfully applied in a flow-through cell to measure H2O2 concentration in different flow rates.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Seong Jae Kim, Ji-hun Jeong, Gaabhin Ryu, Yoon Sick Eom, Sanha Kim
Summary: Surface-enhanced Raman spectroscopy (SERS) is a high-sensitivity, label-free detection method with various analytical applications. Researchers have developed a hydrophobic SERS substrate based on engineered carbon nanotube arrays (CNT-SERS) and studied the role of structural design at both micro and nanoscales. The substrate demonstrated controlled self-enrichment capability and enhanced sensitivity, with a significant increase in the SERS signal. The study also proposed a theoretical model and a concentration strategy inspired by plants for analyte deposition on microarrays.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Dan Zhao, Renjun Jiang, Xiaoqiang Liu, Subbiah Alwarappan
Summary: In this study, a novel ternary composite material was constructed by assembling cerium vanadate nanorods on reduced graphene oxide-microcrystalline cellulose nanosheets, and it was used for real-time monitoring of the concentration of superoxide anions in vivo. The ternary composite showed excellent conductivity, large surface area, and abundant active sites, leading to a wider linear range, high sensitivity, low detection limit, and fast response time for superoxide anion detection.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Tengfei Wang, Liwen Wang, Guang Wu, Dating Tian
Summary: In this study, a covalent organic framework material TaTp-COF with porous and uniform spheres was successfully prepared via hydrothermal reaction, and it was found to significantly enhance the aggregation-induced emission (AIE) of berberine. The unique emission properties of berberine on TaTp-COF were studied and utilized for the sensitive detection of berberine.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Lin Li, Yilei Ding, Lei Xu, Shuoran Chen, Guoliang Dai, Pengju Han, Lixin Lu, Changqing Ye, Yanlin Song
Summary: In this study, a novel TTI based on a ratiometric fluorescent nanosensor is designed, which has the advantages of high accuracy and low cost. Experimental and theoretical investigations confirm its pH responsiveness and demonstrate its good sensitivity and reliability. By monitoring the total volatile basic nitrogen, this TTI can accurately predict food spoilage and can be adaptively modified for different types of food. The TTI based on this nanosensor enables visual monitoring of food quality.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Fangju Chen, Xueting Wang, Wei Chen, Chenwen Shao, Yong Qian
Summary: Lung cancer is the second most common malignant tumor worldwide. Drug resistance in lung cancer leads to treatment failure and recurrence in majority of patients. This study developed a fluorescent prodrug that can be activated in cancer cells to release drugs, and its signal can be tracked by imaging. It shows a unique autophagy-driven ferroptosis effect, indicating its potential for targeting drug-resistant cancer cells.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Weichao Li, Qiming Yuan, Zhangcheng Xia, Xiaoxue Ma, Lifang He, Ling Jin, Xiangfeng Chu, Kui Zhang
Summary: This study developed a high-performance gas sensor for formaldehyde detection by modifying ZnSnO3 with ZnO QDs and SnO2 QDs. The modified sensor showed improved sensing response and lower working temperature. The presence of ZnO QDs formed rich heterojunctions, increased surface area, and provided oxygen deficiency for formaldehyde sensing reaction, thus enhancing the sensor performance. This research provides an alternative method to enhance the sensing properties of MOS by QDs modification.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Joung-Il Moon, Eun Jung Choi, Younju Joung, Jin-Woo Oh, Sang-Woo Joo, Jaebum Choo
Summary: A novel nanoplasmonic substrate was developed for biomedical applications, which showed strong hot spots for detecting biomarkers at low concentrations. The substrate, called AuNPs@M13, was made by immobilizing 60 nm gold nanoparticles onto the surface of an M13 bacteriophage scaffold. It demonstrated higher sensitivity and lower limit of detection compared to commercially available assays.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Ning Li, Ya Zhang, Ying Xu, Xiaofang Liu, Jian Chen, Mei Yang, Changjun Hou, Danqun Huo
Summary: The molecular subtype of breast cancer guides treatment and drug selection. Invasive tests can promote cancer cell metastasis, so the development of high-performance, low-cost diagnostic tools for cancer prognosis is crucial. Liquid biopsy techniques enable noninvasive, real-time, dynamic, multicomponent, quantitative, and long-term observations at the cellular, genetic, and molecular levels. A Cu-Zr metal-organic framework (MOF) nanoenzyme with monatomic Cu attachment has been synthesized and proven to have high catalytic performance. The sensor constructed using this nanoenzyme shows potential for accurate classification of breast cancer serum samples.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Analytical
Jeongmin Kim, Hyemin Kim, Seunghyun Park, Hyeonaug Hong, Yong Jae Kim, Jiyong Lee, Jaeho Kim, Seung-Woo Cho, Wonhyoung Ryu
Summary: This study presents a method to fabricate independently functioning microneedle (MN) electrodes with narrow intervals for high precision electrochemical sensing. The optimized mixture of photocurable polymer and single-wall carbon nanotubes was used to mold single composite MNs, which were then attached to pre-patterned electrodes. Plasma etching and electropolymerization were performed to enhance the electrochemical activity, and Prussian blue and glucose oxidase were electrodeposited on the MNs for glucose detection. The MN electrodes showed good sensitivity and linearity, and the feasibility of glucose detection was demonstrated in an in vivo mouse study.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)