Chemistry Proceedings最新文献_第5页

From Single Nanowires to Smart Systems: Different Ways to Assess Food Quality 从单纳米线到智能系统:评估食品质量的不同方法

Chemistry Proceedings Pub Date : 2021-07-05 DOI: 10.3390/csac2021-10605

M. Tonezzer, F. Biasioli, F. Gasperi

{"title":"From Single Nanowires to Smart Systems: Different Ways to Assess Food Quality","authors":"M. Tonezzer, F. Biasioli, F. Gasperi","doi":"10.3390/csac2021-10605","DOIUrl":"https://doi.org/10.3390/csac2021-10605","url":null,"abstract":"Recently, low-dimensional (1D, 2D) nanostructured materials have been attracting more and more interest as building blocks for innovative systems. Metal oxide nanowires are one of the most widely used materials for solid-state gas sensors, as they are simple to make, inexpensive, and sensitive to a wide range of gases and volatiles. Unfortunately, their broad sensitivity has a price to pay, which is very low selectivity. Fortunately, this flaw is not a problem for all applications. Where the boundary conditions are defined and “simple” (only the presence of a target gas is expected, without any interfering gases), a single traditional chemiresistor may be the best choice, while in cases where the variables are many, it is better to use an intelligent system. In this paper, we will show a resistive sensor based on a single SnO2 nanowire which, working at three temperatures (200, 250, and 300 °C), is able to detect tens of ppb of ammonia (30 ppb at 300 °C). The limit of detection (LoD) was calculated as 3 N/S, where N is the standard deviation of the sensor signal in air and S is the sensor sensitivity. We will show that the performance of this nanosensor is excellent and can be used in various applications, including agri-food quality monitoring. We will demonstrate that the SnO2 nanowire in a thermal gradient can act as a nano-electronic nose thanks to machine learning algorithms. The single nanowire-based sensor can estimate the total viable count with an error of 2.32% on mackerel fish samples stored at room temperature (25 °C) and in a fridge (4 °C). The integration of such a small (less than one square mm) and cheap device into the food supply chain would greatly reduce waste and the frequency of food poisoning.","PeriodicalId":9815,"journal":{"name":"Chemistry Proceedings","volume":"45 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73507332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Unravelling Plant-Pathogen Interactions: Proximal Optical Sensing as an Effective Tool for Early Detect Plant Diseases 揭示植物与病原体的相互作用:近端光学传感作为早期检测植物疾病的有效工具

Chemistry Proceedings Pub Date : 2021-07-01 DOI: 10.3390/csac2021-10560

Mafalda Reis-Pereira, R. C. Martins, Aníbal Filipe Silva, F. Tavares, F. Santos, Mário Cunha

引用次数: 2

Europium-Doped Ceria Nanocrystals as Nanozyme Fluorescent Probes for Biosensing 铕掺杂氧化铈纳米晶体作为纳米酶荧光探针用于生物传感

Chemistry Proceedings Pub Date : 2021-07-01 DOI: 10.3390/csac2021-10549

Ali Othman, A. Hayat, S. Andreescu

{"title":"Europium-Doped Ceria Nanocrystals as Nanozyme Fluorescent Probes for Biosensing","authors":"Ali Othman, A. Hayat, S. Andreescu","doi":"10.3390/csac2021-10549","DOIUrl":"https://doi.org/10.3390/csac2021-10549","url":null,"abstract":"Molecular nanoprobes with intrinsic enzyme-like activity represent a new wave of technology for rapid and sensitive detection of molecular targets. This work reports synthesis and characterization of novel and well-dispersed europium-doped ceria nanocrystals (EuCe NCs) with self-integrated catalytic and fluorescence sensing functions. The NCs have an average size of ∼5 nm and exhibit bright and stable fluorescence for more than 6 months in aqueous media. Their dual cooperative function as both a catalyst and fluorescent probe was explored to develop a universally applicable fluorescence-based biosensing method to monitor enzyme reactions and quantitatively measure clinically relevant molecules. Sensing capabilities are demonstrated for detection of H2O2, glucose/glucose oxidase, lactate/lactate oxidase, phosphatase activity, and the catecholamine neurotransmitter, dopamine. Results indicate that EuCe NCs not only provide high enzyme-mimetic activity, but also impart direct fluorescence sensing ability enabling all-in-one recognition, catalytic amplification, and the detection of biomolecular targets. The EuCe nanozyme offers a stable alternative to the more complex systems based on the combined use of natural enzymes and fluorescent dyes. The high stability and fluorescence detection capabilities demonstrate that EuCe NCs have the potential to be used as a generic platform in chemical and biological sensing and bioimaging applications.","PeriodicalId":9815,"journal":{"name":"Chemistry Proceedings","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87372623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermal Desorption of Explosives Vapour from Organic Fluorescent Sensors 有机荧光传感器中炸药蒸气的热解吸

Chemistry Proceedings Pub Date : 2021-07-01 DOI: 10.3390/csac2021-10559

Edward B Ogugu, R. Gillanders, G. Turnbull

引用次数: 0

Antimony Tin Oxide—Prussian Blue Screen-Printed Electrodes for Electrochemical Sensing of Potassium Ions 用于钾离子电化学传感的锑锡氧化-普鲁士蓝丝网印刷电极

Chemistry Proceedings Pub Date : 2021-07-01 DOI: 10.3390/csac2021-10639

C. Lete, M. Marin, F. D. del Campo, I. Diaconu, Stelian Lupu

{"title":"Antimony Tin Oxide—Prussian Blue Screen-Printed Electrodes for Electrochemical Sensing of Potassium Ions","authors":"C. Lete, M. Marin, F. D. del Campo, I. Diaconu, Stelian Lupu","doi":"10.3390/csac2021-10639","DOIUrl":"https://doi.org/10.3390/csac2021-10639","url":null,"abstract":"In this work, the characterization and the electro-analytical applications of antimony tin oxide (ATO)–Prussian blue (PB) screen printed electrodes (SPE) are presented. The ATO conducting particles have been used recently in the development of screen-printed electrodes due to their excellent spectroelectrochemical properties. PB is a transition metal hexacyanoferrate with high electrocatalytic properties towards various biologically active compounds like hydrogen peroxide, besides its outstanding electrochromic properties. A combination of ATO and PB ingredients into a screen-printing paste provided a versatile and cost-effective way in the development of novel electrode materials for electrochemical sensing. The ATO-PB electrode material displayed good electrochemical properties demonstrated by means of cyclic voltammetry and electrochemical impedance measurements. In addition, the PB provided a high selectivity towards potassium ions in solution due to its zeolitic structures and excellent redox behavior. The cyclic voltammetric responses recorded at the ATO-PB-SPE device in the presence of potassium ions revealed a linear dependence of the cathodic peak current and cathodic peak potential of the Prussian blue/Everitt’s salt redox system on the potassium concentrations ranging from 0.1 to 10 mM. This finding could be exploited in the development of an electrochemical sensor for electro-inactive chemical species. The potential application of the ATO-PB electrode in the electrochemical sensing of electro-active species like caffeic acid was also studied. An increase of the anodic peak current of the PB/ES redox wave in the presence of caffeic acid was observed. These results point out to the potential analytical applications of the ATO-PB electrode in the sensing of both electro-active and electro-inactive species.","PeriodicalId":9815,"journal":{"name":"Chemistry Proceedings","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90178426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Silver Nanomaterials as Electron Mediators in a Bio-Electronic Tongue Dedicated to the Analysis of Milks. The Role of the Aspect Ratio of Nanoparticles vs. Nanowires 银纳米材料作为电子介质在生物电子舌中用于分析牛奶。纳米粒子与纳米线长宽比的作用

Chemistry Proceedings Pub Date : 2021-07-01 DOI: 10.3390/csac2021-10554

C. Salvo-Comino, C. Pérez-González, F. Martín-Pedrosa, C. García-Cabezón, M. L. Rodriguez-Mendez

引用次数: 0

Bioactive Compound Profiling and Nutritional Composition of Three Species from the Amaranthaceae Family 苋菜科三种植物的生物活性成分分析及营养成分分析

Chemistry Proceedings Pub Date : 2021-07-01 DOI: 10.3390/csac2021-10563

Bernabé Nuñez-Estevez, T. Finimundy, M. Carpena, M. Barral-Martinez, R. Calhelha, T. Pires, P. Otero, P. García-Pérez, J. Simal-Gándara, I. Ferreira, M. Prieto, L. Barros

引用次数: 2

Detection of Indoor Air Pollutants Using Reactive Sputtering/GLAD of Tin Oxide Thin Films 氧化锡薄膜反应溅射/GLAD检测室内空气污染物

Chemistry Proceedings Pub Date : 2021-07-01 DOI: 10.3390/csac2021-10548

Achraf El Mohajir, Jean-Baptiste Sanchez, M. Arab Pour Yazdi, O. Heintz, N. Martin

引用次数: 0

Evaluation of the Effect of Extracted Time Conditions on the Phenolic Content of Olive Pastes from cv. Arbequina and Discrimination Using a Lab-Made Potentiometric Electronic Tongue 提取时间条件对橄榄糊酚类物质含量影响的研究。利用实验室研制的电位电子舌进行检测和鉴别

Chemistry Proceedings Pub Date : 2021-07-01 DOI: 10.3390/csac2021-10556

Ítala M. G. Marx, Nuno F. Rodrigues, A. C. Veloso, J. Pereira, A. M. Peres

{"title":"Evaluation of the Effect of Extracted Time Conditions on the Phenolic Content of Olive Pastes from cv. Arbequina and Discrimination Using a Lab-Made Potentiometric Electronic Tongue","authors":"Ítala M. G. Marx, Nuno F. Rodrigues, A. C. Veloso, J. Pereira, A. M. Peres","doi":"10.3390/csac2021-10556","DOIUrl":"https://doi.org/10.3390/csac2021-10556","url":null,"abstract":"The present study investigated the effect of malaxation times (Mt) (0, 15, 30, 45 and 60 min), during the industrial extraction of cv. Arbequina oils at 25 °C on total phenolic content of olive pastes. Additionally, the possibility of applying a lab-made potentiometric electronic tongue (E-tongue), comprising 40 lipid/polymer sensor membranes with cross sensitivity, to discriminate the olive pastes according to the Mt, was evaluated. The results pointed out that the olive pastes’ total phenolic contents significantly decreased (p-value < 0.001, one-way ANOVA) with the increase of the Mt (from 2.21 ± 0.02 to 1.99 ± 0.03 g gallic acid equivalents/kg olive paste), there being observed a linear decreasing trend (R-Pearson = −0.910). These findings may be tentatively attributed to the migration of the phenolic compounds from the olive pastes to the extracted oil and water phases, during the malaxation process. Finally, the E-tongue signals, acquired during the analysis of the olive pastes’ methanolic extracts (methanol:water, 80:20 v/v), together with a linear discriminant analysis (LDA), coupled with a simulated annealing (SA) algorithm, allowed us to establish a successful classification model. The E-tongue-LDA-SA model, based on 11 selected non-redundant sensors, allowed us to correctly discriminate all the studied olive pastes according to the Mt (sensitivities of 100% for training and leave-one-out cross-validation). The satisfactory performance of the E-tongue could be tentatively explained by the known capability of lipid/polymeric sensor membranes to interact with phenolic compounds, through electrostatic interactions and/or hydrogen bonds, which total content depended on the Mt.","PeriodicalId":9815,"journal":{"name":"Chemistry Proceedings","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90105200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Critical Variables Influencing the Ultrasound-Assisted Extraction of Bioactive Compounds—A Review 影响超声辅助提取生物活性化合物的关键因素综述

Chemistry Proceedings Pub Date : 2021-07-01 DOI: 10.3390/csac2021-10562

A. Carreira-Casais, M. Carpena, A. Pereira, F. Chamorro, A. Soria-López, Pascual García Pérez, P. Otero, H. Cao, Jianbo Xiao, J. Simal-Gándara, M. Prieto

引用次数: 5