Article
Engineering, Electrical & Electronic
Akshaya Kumar Aliyana, Priyanka Ganguly, Ajay Beniwal, S. K. Naveen Kumar, Ravinder Dahiya
Summary: The estimation of pH is crucial in various applications, and this study presents a screen-printed flexible and disposable pH sensor that uses the impedimetric method. The sensor exhibits high sensitivity and can be used for pH monitoring of soil, potentially contributing to digital agriculture.
IEEE SENSORS JOURNAL
(2022)
Article
Chemistry, Analytical
Yuqi Chen, Richard Compton
Summary: A bespoke calibration-free pH sensor using an in situ modified Ir electrode for applications in seawater is reported. The sensor features three pH-sensitive redox couples on the surface of the iridium electrode, with Ir(III/IV) demonstrating a super-Nernstian response and high sensitivity for pH measurement.
Article
Engineering, Multidisciplinary
Weijiang Xu, Jian Qu, Yi Liu, Jinke Bai, Yan Li, Shiliang Qu
Summary: A calibration-free fiber sensor based on CdZnSe/ZnSe/ZnS quantum dots was proposed. The sensor was fabricated by filling a hollow core fiber with QDs solutions and sealing the micro-cavity using fusion tapering. The sensor demonstrated a similar temperature sensitivity of 0.12 nm/°C for different cavity lengths, providing a universal temperature demodulation function. It also exhibited excellent stability and repeatability, making it suitable for real-time monitoring of thermal signals generated by human activity.
Article
Physics, Multidisciplinary
Wenli Zhang, Xiaotian Liu, Youhui Lin, Liyun Ma, Linqing Kong, Guangzong Min, Ronghui Wu, Sharwari K. Mengane, Likun Yang, Aniruddha B. Patil, Xiang Yang Liu
Summary: A flexible, transparent, and disposable solid-state pH sensor based on PdNPs/NC composite material has been developed. This sensor can accurately and in real-time measure the pH of body fluids, and it exhibits high sensitivity and stability.
Article
Engineering, Electrical & Electronic
Mohammadreza Salehi Moghaddam, Hamid Latifi, Elham Abedini, Mohsen Ghazanfar, Ebrahim Behroodi, Mojde Salmani Sadeghi
Summary: The optical pH sensor based on smart hydrogel material was designed for microfluidic applications. The sensor made use of chitosan-TEOS interpenetrating network as a pH-sensitive component. By bonding the chitosan-TEOS-PDMS layer to a thin layer of PDMS, the sensor can be easily integrated into microfluidic chips. The thickness of the PDMS layer can be adjusted to control the sensitivity of the sensor. The sensor's response to pH changes was measured using the optical astigmatism method, and the experimental results showed its stability and sensitivity.
IEEE SENSORS JOURNAL
(2023)
Article
Chemistry, Analytical
Hugo Alvarez, Marcos Alonso, Jairo R. Sanchez, Alberto Izaguirre
Summary: This paper presents a method for calibrating multi-camera and multi-laser 3D triangulation systems, utilizing a conical calibration object and stepped line patterns for calculating camera-laser homographies. The experiments demonstrate a precision of 0.1 mm for the proposed system, showing its effectiveness in calibrating scanners for revolving surfaces.
Article
Chemistry, Analytical
Rahul Kumar, Hien Nguyen, Bruno Rente, Christabel Tan, Tong Sun, Kenneth T. Grattan
Summary: In this study, a portable optical fiber-based sensor for monitoring pH in microfluidic channels was developed. The sensor showed good performance and could be easily integrated with microfluidic systems.
Article
Chemistry, Analytical
Fabian Steininger, Silvia E. Zieger, Klaus Koren
Summary: Combining electrochemical and optical sensors allows for a dynamic sensing concept for buffer capacity evaluation by modulating the pH microenvironment using water electrolysis. This approach enables quick assessment of concentration of different buffer species and in situ determination of the apparent pK value of specific buffer solutions under ambient conditions.
ANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Analytical
Khengdauliu Chawang, Sen Bing, Jung-Chih Chiao
Summary: The development of planar and flexible electrochemical pH sensors with iridium oxide sensing film for viscous solutions is investigated in this study. The study analyzes the effects of salt interference and solution viscosity on pH-sensing responses. The findings indicate that these planar electrodes can provide predictable pH deviations when measuring pH in viscous solutions.
Article
Chemistry, Analytical
Supatinee Kongkaew, Suparat Cotchim, Proespichaya Kanatharana, Panote Thavarungkul, Warakorn Limbut
Summary: A compact and low-cost multi-electrode array (MEA) with four working electrodes, shared reference and auxiliary electrodes was developed. Prussian blue nanocubes (PBNCs) were electrodeposited on the MEA and used as a platform for a label-free immunosensor. The immunosensor successfully detected four breast cancer tumor markers with acceptable recoveries and demonstrated potential for point-of-care testing.
Article
Biophysics
Wangwang Zhu, Haixia Yu, Zhihua Pu, Zijing Guo, Hao Zheng, Chengcheng Li, Xingguo Zhang, Jun Li, Dachao Li
Summary: Reverse iontophoresis (RI) is a promising technology in continuous glucose monitoring (CGM) due to its finger-stick-free operation, wearability, and non-invasiveness. This study investigated the impact of pH on glucose extraction flux through theoretical analysis and numerical simulations, revealing that pH significantly affects the zeta potential and thus alters the direction and flux of glucose iontophoretic extraction. A screen-printed glucose biosensor integrated with RI extraction electrodes was developed for ISF extraction and glucose monitoring.
BIOSENSORS & BIOELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Sonika Sharma, Banshi D. Gupta
Summary: The fiber optic sensor uses specific compounds coated on the fiber surface to detect K+ concentration in the environment, with high selectivity and fast response, and can be used for detecting K+ in soil.
OPTICAL FIBER TECHNOLOGY
(2021)
Article
Chemistry, Analytical
Elisa Santovito, Sophia Elisseeva, Joseph P. Kerry, Dmitri B. Papkovsky
Summary: We present a novel sensor platform for rapid analysis of total aerobic viable counts (TVCs) in food samples. The system uses sealable plastic sachets with phosphorescent oxygen sensors and liquid growth media. By monitoring the sensor signals non-invasively with a handheld reader, the TVC load of the samples can be quantified quickly, providing results in 1-6 hours, which is significantly faster than the traditional plate counting method.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Engineering, Multidisciplinary
Xiaoming Liu, Lu Gan, Bin Yang
Summary: This article reviews non-resonant free-space measurement techniques for dielectric permittivity in the millimeter wave range, using vector network analysis. It discusses various systems, theoretical models, extraction algorithms, and calibration methods, as well as the measurement of different types of samples. The advantages of free-space material extraction methods are compared with resonance and transmission line methods, with a perspective on future developments.
Article
Chemistry, Analytical
Xuzhan Chen, Youping Chen, Bing Chen, Zhuo He, Yunxiu Ma, Dailin Zhang, Homayoun Najjaran
Summary: A novel LTS calibration method without knowing the camera intrinsic matrix is proposed, which significantly improves the precision of displacement measurement through parameter optimization.
Article
Chemistry, Analytical
Yujia Ying, Huilin Li
Summary: Enzymes play a crucial role as biological catalysts in accelerating biochemical reactions in living organisms. This study proposes a convenient method for monitoring enzymatic catalytic processes using native top-down mass spectrometry. By exploring the heterogeneity of the chymotrypsin sample and using tandem mass spectrometry, the researchers were able to monitor covalent and noncovalent enzymatic complexes, substrates, and products during catalysis. The results demonstrate that this method has the potential to be a promising tool for characterizing biocatalysts.
ANALYTICA CHIMICA ACTA
(2024)
Article
Chemistry, Analytical
Kang Yang, Shuaibo Shi, Jinyu Wu, Shaolong Han, Shengdi Tai, Shishen Zhang, Kun Zhang
Summary: H2O and D2O are important analogues closely related to various industries and monitoring fields. This study successfully distinguishes and detects H2O and D2O by designing a novel eu(III)-macrocycle with dual emitters, Eu-2a, and conducting fluorescence titration experiments.
ANALYTICA CHIMICA ACTA
(2024)
Article
Chemistry, Analytical
Julia Kuligowski, Alvaro Perez-Rubio, Marta Moreno-Torres, Polina Soluyanova, Judith Perez-Rojas, Ivan Rienda, David Perez-Guaita, Eugenia Pareja, Ramon Trullenque-Juan, Jose Castell, Marcha Verheijen, Florian Caiment, Ramiro Jover, Guillermo Quintas
Summary: This study introduces a novel variable selection approach called cluster PLS (c-PLS) to assess the joint impact of variable groups selected based on biological characteristics on the predictive performance of a multivariate model. The usefulness of c-PLS is shown using miRNomic and metabolomic datasets obtained from the analysis of liver tissue biopsies.
ANALYTICA CHIMICA ACTA
(2024)
Article
Chemistry, Analytical
Meixue Lai, Lijie Zhong, Siyi Liu, Yitian Tang, Tingting Han, Huali Deng, Yu Bao, Yingming Ma, Wei Wang, Li Niu, Shiyu Gan
Summary: This study presents a method for constructing wearable sweat electrolyte sensors using carbon fiber-based solid-contact ion-selective electrodes (SC-ISEs). By using carbon fibers extracted from commercial cloth as electrode material, the cost and reproducibility issues of flexible SC-ISEs were addressed. The results showed that the carbon fiber-based SC-ISEs exhibited reversible voltammetric and stable impedance performances, and had high reproducibility of standard potentials between normal and bending states.
ANALYTICA CHIMICA ACTA
(2024)
Article
Chemistry, Analytical
Ke Yang, Ying Liu, Min Deng, Peipei Wang, Dan Cheng, Songjiao Li, Longwei He
Summary: A near-infrared fluorescent probe has been developed to accurately measure the levels of peroxynitrite (ONOO-) in the endoplasmic reticulum (ER) in acute lung injury (ALI). The probe demonstrated rapid response, high selectivity, good sensitivity, and enhanced fluorescence intensity in response to ONOO-. It was successfully used to detect changes in ONOO- levels and showed significant increases in an ALI cell model and an ALI mouse model.
ANALYTICA CHIMICA ACTA
(2024)
Article
Chemistry, Analytical
Yanping Wang, Yuemei Chen, Kejun Li, Jinrong Zhou, Xin Yuan, Mei Zhang, Ke Huang
Summary: In this work, a portable analytical system based on point discharge chemical vapor generation atomic emission spectrometry (PD-CVG-AES) coupling with gold filament enrichment was designed. The highly sensitive analysis of Hg2+ indirectly realized the detection of ascorbic acid (AA). The measurement is based on the fact that Ag+ can decrease the concentration of Hg2+ by forming Ag-Hg amalgam in the presence of the reductant SnCl2, while AA can pre-reduce Ag+ to Ag0, leading to the generation of silver nanoparticles (Ag NPs). The developed novel analytical strategy broadens the application of microplasma-based AES and offers a higher level of sensitivity compared to current AA detection techniques.
ANALYTICA CHIMICA ACTA
(2024)
Article
Chemistry, Analytical
Yundi Huang, Bo Song, Kaiwen Chen, Deshu Kong, Jingli Yuan
Summary: This study developed two lysosome-targetable background-free TGL probes for efficient and accurate detection of 1O2, which can be used for monitoring endogenous 1O2 concentrations in lysosomes and discriminating variability induced by different photosensitizers. Furthermore, a smart luminescent sensor film was successfully prepared for on-site 1O2 production detection during PDT processes, offering a promising clinical monitoring tool for skin diseases.
ANALYTICA CHIMICA ACTA
(2024)
Article
Chemistry, Analytical
Wei Lang, Jia-Mei Qin, Qian-Yong Cao
Summary: A novel polymer-based probe P1 was successfully synthesized for fluorescently ratiometric sensing of H2S with high selectivity and sensitivity. A smartphone sensing platform was constructed to conduct visual quantitative detection of H2S. P1 can be employed in evaluating the level fluctuations of H2S in living cells, testing water samples/wine samples, and monitoring food freshness.
ANALYTICA CHIMICA ACTA
(2024)
Article
Chemistry, Analytical
Yuanyuan Qin, Shuda Liu, Shuyun Meng, Dong Liu, Tianyan You
Summary: The study developed a split aptamer-based sandwich-type ratiometric biosensor for the detection of 17 beta-estradiol (E2) using photoelectrochemical and electrochemical assays. The biosensor utilized split aptamer fragments to recognize E2 and trigger a hybridization chain reaction, resulting in the production of double-stranded DNA labeled with CdTe quantum dots. This DNA complex was able to sensitize CdTe quantum dots and generate response signals for E2 detection. The developed biosensor demonstrated high sensitivity and accuracy with two linear ranges and low detection limits.
ANALYTICA CHIMICA ACTA
(2024)
Article
Chemistry, Analytical
Siriwan Teepoo, Jongjit Jantra, Khaunnapa Panapong, David Taiwo Ajayi
Summary: A novel immunochromatographic assay based on hyperbranched Au plasmonic blackbodies with a smartphone readout was developed for rapid and sensitive detection of leucomalachite green residues in fish and shrimp products.
ANALYTICA CHIMICA ACTA
(2024)
Article
Chemistry, Analytical
Andrea L. Larraga-Urdaz, Borja Moreira-Alvarez, Jorge Ruiz Encinar, Jose M. Costa-Fernandez, Maria Luisa Fernandez-Sanchez
Summary: A major challenge in the 21st century is the development of point-of-care diagnostic tools. In this study, a highly sensitive and simple bioassay using AuNPs and MNAzymes was developed for rapid detection and quantification of miRNA-4739. The proposed strategy shows potential for breast cancer diagnosis.
ANALYTICA CHIMICA ACTA
(2024)
Article
Chemistry, Analytical
Xiaohan Zhao, Anyu Wang, Lingzi Zhai, Jiuhe Gao, Sizhe Lyu, Yingshan Jiang, Tian Zhong, Ying Xiao, Xi Yu
Summary: A novel method using polystyrene-coated magnetic nanoparticles for extracting monohydroxy polycyclic aromatic hydrocarbons from urine samples was investigated. The proposed method is simple, sensitive, and efficient, with desirable sensitivity for analyzing low-abundance metabolites in large volumes of complex urine samples.
ANALYTICA CHIMICA ACTA
(2024)
Article
Chemistry, Analytical
Ke Quan, Yuqing Zeng, Wenke Zhang, Fengfeng Li, Mengjiao Li, Zhihe Qing, Linlin Wu
Summary: In this study, a visual and reusable biosensor was developed for detecting substrates that are closely associated with human physiological health. The immobilized oxidase showed higher stability and sensitivity under harsh conditions, enabling reliable detection of substrates in complex fluids.
ANALYTICA CHIMICA ACTA
(2024)
Article
Chemistry, Analytical
Dongjuan Wang, Xiuqian Ding, Jinling Xie, Juan Wang, Guanhao Li, Xin Zhou
Summary: In this study, a three-in-one sensor was developed for real-time detection of biogenic amines (BAs) with high sensitivity and selectivity. The sensor showed multimodal responses and could be used to fabricate portable devices for on-site non-destructive assessment of food spoilage indicators.
ANALYTICA CHIMICA ACTA
(2024)
Article
Chemistry, Analytical
Jinting Meng, Zihao Xu, Shasha Zheng, Hongqun Yang, Tianfu Wang, Hong Wang, Yingwei Zhang
Summary: This study demonstrates the development of a cascade signal amplification system using a multi-pedal DNA walker and strand displacement reactions for the electrochemical detection of miRNA-155. The biosensor exhibited high sensitivity, selectivity, and the potential for clinical applications.
ANALYTICA CHIMICA ACTA
(2024)