Chemistry Proceedings最新文献_第10页

Group 14 Metallafluorenes for Lipid Structure Detection and Cellular Imaging 第14组金属芴用于脂质结构检测和细胞成像

Chemistry Proceedings Pub Date : 2021-06-30 DOI: 10.3390/csac2021-10455

H. Spikes, Shelby J. Jarrett-Noland, Stephan M. Germann, W. Olivas, J. Braddock-Wilking, C. M. Dupureur

引用次数: 1

Sensitive and Selective Voltammetric Sensors for the Simultaneous Quantification of Natural Phenolic Antioxidants in Cognac and Brandy 灵敏和选择性伏安传感器用于同时定量干邑和白兰地中天然酚类抗氧化剂

Chemistry Proceedings Pub Date : 2021-06-30 DOI: 10.3390/csac2021-10420

G. Ziyatdinova, E. Guss

引用次数: 1

Development of a Pattern Recognition Tool for the Classification of Electronic Tongue Signals Using Machine Learning 基于机器学习的电子舌信号分类模式识别工具的开发

Chemistry Proceedings Pub Date : 2021-06-30 DOI: 10.3390/csac2021-10447

Edgar G. Mendez-Lopez, Jersson X. Leon-Medina, D. Tibaduiza

{"title":"Development of a Pattern Recognition Tool for the Classification of Electronic Tongue Signals Using Machine Learning","authors":"Edgar G. Mendez-Lopez, Jersson X. Leon-Medina, D. Tibaduiza","doi":"10.3390/csac2021-10447","DOIUrl":"https://doi.org/10.3390/csac2021-10447","url":null,"abstract":"Electronic tongue type sensor arrays are made of different materials with the property of capturing signals independently by each sensor. The signals captured when conducting electrochemical tests often have high dimensionality, which increases when performing the data unfolding process. This unfolding process consists of arranging the data coming from different experiments, sensors, and sample times, thus the obtained information is arranged in a two-dimensional matrix. In this work, a description of a tool for the analysis of electronic tongue signals is developed. This tool is developed in Matlab® App Designer, to process and classify the data from different substances analyzed by an electronic tongue type sensor array. The data processing is carried out through the execution of the following stages: (1) data unfolding, (2) normalization, (3) dimensionality reduction, (4) classification through a supervised machine learning model, and finally (5) a cross-validation procedure to calculate a set of classification performance measures. Some important characteristics of this tool are the possibility to tune the parameters of the dimensionality reduction and classifier algorithms, and also plot the two and three-dimensional scatter plot of the features after reduced the dimensionality. This to see the data separability between classes and compatibility in each class. This interface is successfully tested with two electronic tongue sensor array datasets with multi-frequency large amplitude pulse voltammetry (MLAPV) signals. The developed graphical user interface allows comparing different methods in each of the mentioned stages to find the best combination of methods and thus obtain the highest values of classification performance measures.","PeriodicalId":9815,"journal":{"name":"Chemistry Proceedings","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78123573","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: 1

Numerical and Experimental Modeling of Paper-Based Actuators 纸质执行器的数值与实验建模

Chemistry Proceedings Pub Date : 2021-06-30 DOI: 10.3390/csac2021-10468

Ashutosh Kumar, H. Heidari-Bafroui, Amer Charbaji, Nasim Rahmani, C. Anagnostopoulos, M. Faghri

{"title":"Numerical and Experimental Modeling of Paper-Based Actuators","authors":"Ashutosh Kumar, H. Heidari-Bafroui, Amer Charbaji, Nasim Rahmani, C. Anagnostopoulos, M. Faghri","doi":"10.3390/csac2021-10468","DOIUrl":"https://doi.org/10.3390/csac2021-10468","url":null,"abstract":"Microfluidic paper-based analytical devices (μPADs) have witnessed a great extent of innovation over the past decade, developing new components and materials assisting the diagnosis of different diseases and sensing of a wide range of biological, chemical, optical, and electrochemical phenomena. The novel paper-based cantilever (PBC) actuator is one the major components that allows autonomous loading and control of multiple fluid reagents required for the accurate operation of paper-based microfluidic devices. This paper provides an extensive overview of numerical and experimental modeling of fluidically controlled PBC actuators for automation of the paper-based assay. The PBC model undergoing hygro-expansion utilizes quasi-static 2D fluid loaded structure governed by the Euler–Bernoulli beam theory for small and moderately large deflections. The solution for the model can avail the response of paper-based actuators for response deflection θ, within 0° to 10° under the assumption of insignificant cross-sectional deformation. The actuation of PBC obtained using a quasi-static theory shows that our results are consistent with quantitative experiments demonstrating the adequacy of models.","PeriodicalId":9815,"journal":{"name":"Chemistry Proceedings","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89741481","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: 5

Xanthine Oxidase Inhibition by Aqueous Extract of Limonium brasiliense (Plumbaginaceae) 巴西柠檬水提物对黄嘌呤氧化酶的抑制作用

Chemistry Proceedings Pub Date : 2020-12-14 DOI: 10.3390/ECSOC-24-08410

S. Rodriguez, A. Murray, J. Leiro

引用次数: 4

Microwave-Assisted Multicomponent Syntheses of Heterocyclic Phosphonates 微波辅助多组分合成杂环膦酸盐

Chemistry Proceedings Pub Date : 2020-11-25 DOI: 10.3390/ECSOC-24-08548

E. Bálint, Nóra Popovics-Tóth, Ádám Tajti, Bettina Rávai, K. Szabó, F. Perdih

引用次数: 0

s-Triazine: A Multidisciplinary and International Journey s-三嗪:多学科和国际之旅

Chemistry Proceedings Pub Date : 2020-11-20 DOI: 10.3390/ECSOC-24-08502

Anamika Sharma, Z. Almarhoon, Rotimi Sheyi, Rakia Abd Alhameed, B. G. Torre, F. Albericio, Ayman Al-Faham

{"title":"s-Triazine: A Multidisciplinary and International Journey","authors":"Anamika Sharma, Z. Almarhoon, Rotimi Sheyi, Rakia Abd Alhameed, B. G. Torre, F. Albericio, Ayman Al-Faham","doi":"10.3390/ECSOC-24-08502","DOIUrl":"https://doi.org/10.3390/ECSOC-24-08502","url":null,"abstract":"2,4,6-Trichloro-1,3,5-triazine (TCT) offers the unique ability to undergo sequential nucleophilic substitution reactions using regular nucleophiles (first Cl replacement at 0 °C, second at RT, and third at >90 °C), making s-triazine a privileged scaffold-finding application in drug development with an extension towards the development of new materials. This selective chemical property of TCT fulfills the goal of chemists to control organic structures and make them react in the required conditions for achieving each objective. In this regard, orthogonality and chemoselectivity are two modern organic chemistry concepts which have been exploited in various areas of research, ranging from supramolecular chemistry to organic/bioconjugation chemistry. We have demonstrated the fusion of these two concepts using TCT as “Orthogonal Chemoselectivity” and defined it as discrimination between reactive sites in any order. The usage of azide as one of the nucleophiles modulated the reactivity of the s-triazine core for the last Cl replacement. This allowed us to overcome the barrier of higher temperature (>90 °C) for the last Cl replacement which happened at RT, taking advantage of side chains of Cys, Tyr and Lys in a biological context. In this presentation, we revise the chemistry developed in our laboratories to manipulate the TCT core for application in our medicinal chemistry programs and in bioconjugation.","PeriodicalId":9815,"journal":{"name":"Chemistry Proceedings","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82873763","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

Synthesis of Amidines and Its Application to Pyrimidouracil Synthesis 氨基类化合物的合成及其在嘧啶尿嘧啶合成中的应用

Chemistry Proceedings Pub Date : 2020-11-20 DOI: 10.3390/ECSOC-24-08503

P. Debnath

引用次数: 0

An Improved Stereoselective Synthesis of (1R,2S,3S,4R,5R)-4-Amino-5-(hydroxymethyl)-cyclopentane-1,2,3-triol 改进立体选择性合成(1R,2S,3S,4R,5R)-4-氨基-5-(羟甲基)-环戊烷-1,2,3-三醇

Chemistry Proceedings Pub Date : 2020-11-19 DOI: 10.3390/ECSOC-24-08474

Rubén López-Cortés, A. Vazquez, Alberto Fernández, R. Estévez, J. Estévez

引用次数: 0

Fluorescent Calix[4]arene-Oxacyclophane Sensor for Transition Metal Cations 过渡金属阳离子荧光杯[4]芳烃-氧环烷传感器

Chemistry Proceedings Pub Date : 2020-11-16 DOI: 10.3390/ECSOC-24-08453

Alexandra I. Costa, Patrícia D. Barata, J. V. Prata

{"title":"Fluorescent Calix[4]arene-Oxacyclophane Sensor for Transition Metal Cations","authors":"Alexandra I. Costa, Patrícia D. Barata, J. V. Prata","doi":"10.3390/ECSOC-24-08453","DOIUrl":"https://doi.org/10.3390/ECSOC-24-08453","url":null,"abstract":"The sensing behavior of a calix[4]arene-oxacyclophane-carbazole conjugate (1) towards Cu(I) ions was investigated. Contrary to the noteworthy sensitivity and selectivity previously found for Cu(II), the affinity of 1 for Cu(I) cations is much lower. Through fluorescence titration assays, the apparent binding constants (Ka) for the two ions were determined, showing that an affinity of over thirteen fold was displayed for Cu(II). Two Cu(I) counter-ions were used to determine possible effects on the binding event. It was found that acetate and iodide ions behave similarly, yielding Ka of the same magnitude. Formation of a ground-state supramolecular complex between 1 and Cu(I) ions was not observed on UV-Vis titrations, in contrast to what was previously reported for Cu(II) using the same host. The affinity of 1 for Fe(III), a major biological competitor, was also assessed. The fluorescence of host 1 is quenched by Fe(III) ions although to a lesser extent (32% less efficient than Cu(II)). The study demonstrates that calixarene 1 is able to differentiate copper ions in two common oxidation states using fluorescence techniques, thereby suggesting its application for redox-active centers in biomimetic chemistry.","PeriodicalId":9815,"journal":{"name":"Chemistry Proceedings","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76772077","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