Advanced Journal of Chemistry-Section A最新文献

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One-Pot Synthesis of Tetracyanocyclopropane Derivatives Using Hexamethylenetetramine-Bromine (HMTAB) 六亚甲基四胺-溴(HMTAB)一锅法合成四氰环丙烷衍生物

Advanced Journal of Chemistry-Section A Pub Date : 2018-09-01 DOI: 10.29088/SAMI/AJCA.2018.2.711

M. Heravi, H. Oskooie, Z. Latifi, Hoda Hamidi

引用次数: 3

Prediction of two-dimensional gas chromatography time-of-flight mass spectrometry retention times of 160 pesticides and 25 environmental organic pollutants in grape by multivariate chemometrics methods 多元化学计量学方法预测葡萄中160种农药和25种环境有机污染物的二维气相色谱-飞行时间质谱保留时间

Advanced Journal of Chemistry-Section A Pub Date : 2018-09-01 DOI: 10.29088/SAMI/AJCA.2018.3.1231

I. Amini, K. Pal, S. Esmaeilpoor, A. Abdelkarim

{"title":"Prediction of two-dimensional gas chromatography time-of-flight mass spectrometry retention times of 160 pesticides and 25 environmental organic pollutants in grape by multivariate chemometrics methods","authors":"I. Amini, K. Pal, S. Esmaeilpoor, A. Abdelkarim","doi":"10.29088/SAMI/AJCA.2018.3.1231","DOIUrl":"https://doi.org/10.29088/SAMI/AJCA.2018.3.1231","url":null,"abstract":"A quantitative structure–retention relation (QSRR) study was conducted on the retention times of 160 pesticides and 25 environmental organic pollutants in wine and grape. The genetic algorithm was used as descriptor selection and model development method. Modeling of the relationship between selected molecular descriptors and retention time was achieved by linear (partial least square; PLS) and nonlinear (kernel PLS: KPLS and Levenberg-Marquardt artificial neural network; L-M ANN) methods. The QSRR models were validated by cross-validation as well as application of the models to predict the retention of external set compounds, which did not have contribution in model development steps. Linear and nonlinear methods resulted in accurate prediction whereas more accurate results were obtained by L-M ANN model. The best model obtained from L-M ANN showed a good R2 value (determination coefficient between observed and predicted values) for all compounds, which was superior to those of other statistical models. This is the first research on the QSRR of the compounds in wine and grape against the retention time using the GA-KPLS and L-M ANN.","PeriodicalId":7207,"journal":{"name":"Advanced Journal of Chemistry-Section A","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82204347","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

Determination of acetaminophen using a glassy carbon electrode modified by horseradish peroxidase trapped in MWCNTs/silica sol-gel matrix 用MWCNTs/二氧化硅溶胶-凝胶基质中捕获的辣根过氧化物酶修饰的玻碳电极测定对乙酰氨基酚

Advanced Journal of Chemistry-Section A Pub Date : 2018-09-01 DOI: 10.29088/SAMI/AJCA.2018.5.3955

J. Ghodsi, A. Rafati, Yalda Shoja

{"title":"Determination of acetaminophen using a glassy carbon electrode modified by horseradish peroxidase trapped in MWCNTs/silica sol-gel matrix","authors":"J. Ghodsi, A. Rafati, Yalda Shoja","doi":"10.29088/SAMI/AJCA.2018.5.3955","DOIUrl":"https://doi.org/10.29088/SAMI/AJCA.2018.5.3955","url":null,"abstract":"A new and easy to fabricate voltammetric biosensor for acetaminophen determination was developed based on horseradish peroxidase (HRP) trapped between silica sol-gel film and multi-walled carbon nanotubes on glassy carbon electrode. Acetaminophen determinations were carried out in presence of H2O2 as enzyme activator. The modified electrode showed excellent electrocatalytic activity and rapid response to acetaminophen in the presence of H2O2 as enzyme activator. Various parameters influencing the biosensor performance such as amount of enzyme, H2O2 concentration, potential scan rate and pH have been investigated. Under the optimal conditions, a wide linear range of 1.85×10−6 to 2.7×10−3 M for acetaminophen determination was obtained. Limit of detection was calculated about 18 nM and sensitivity was about 220 nA/µM. Furthermore, the proposed biosensor was successfully examined for simultaneous determination of acetaminophen with uric acid (UA) and folic acid (FA) as prevalent interferes. The proposed biosensor showed satisfactory stability for 3 weeks and applicability of developed biosensor was confirmed with accurately evaluation of acetaminophen in real samples such as urine and tablet.","PeriodicalId":7207,"journal":{"name":"Advanced Journal of Chemistry-Section A","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90918712","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: 8

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