Journal of Analytical Sciences, Methods and Instrumentation最新文献_第5页

Fractional Yield, Extract Composition and Variability from Jordanian Oil Shales 约旦油页岩的分馏收率、萃取物组成和变异性

Journal of Analytical Sciences, Methods and Instrumentation Pub Date : 2016-09-16 DOI: 10.4236/JASMI.2016.63007

H. Alnawafleh, F. Fraige, K. Tarawneh, Ibrahim A. Sarairahc, L. Al-khatib

{"title":"Fractional Yield, Extract Composition and Variability from Jordanian Oil Shales","authors":"H. Alnawafleh, F. Fraige, K. Tarawneh, Ibrahim A. Sarairahc, L. Al-khatib","doi":"10.4236/JASMI.2016.63007","DOIUrl":"https://doi.org/10.4236/JASMI.2016.63007","url":null,"abstract":"Surface and subsurface oil shale (OS) rocks in Jordan have potential economic value for the country and still unutilized. This research paper focuses on central and southern OS deposits in Jordan. Brief characterization of four OS deposits is presented. Size distribution test and elemental analysis were performed. Shale oil was extracted via three solvation methods: Soxhlet extraction, extraction via mixing and stirring, and lastly super-critical fluid extraction. Major shale oil fractions were obtained from extract fractionation on chromatographic column. The nuclear magnetic resonance spectroscopy technique was used to study qualitatively the fractional composition of OS extract. Results show that all studied OS deposits have quite similar trend in their particle size distribution and their elemental composition. These OS deposits are found to be varying in their solvation behavior, fractional yield, and shale oil composition. Highest yield is obtained from polar solvents. The OS extraction via solvation processes is promising under certain extraction conditions such as super-critical conditions. The solvation variability of Jordanian OS indicates that different extraction techniques suit different OS deposits. Such variability should be considered in any future extraction options.","PeriodicalId":14932,"journal":{"name":"Journal of Analytical Sciences, Methods and Instrumentation","volume":"60 1","pages":"51-63"},"PeriodicalIF":0.0,"publicationDate":"2016-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87012680","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: 6

Rapid Separation of Five Cyclosporin Analogs by Supercritical Fluid Chromatography 超临界流体色谱法快速分离五种环孢素类似物

Journal of Analytical Sciences, Methods and Instrumentation Pub Date : 2016-06-08 DOI: 10.4236/JASMI.2016.62004

Y. Shao, Chunlei Wang, Atsu Apedo, O. Mcconnell

引用次数: 8

Simple HPLC-Fluorescence Determination of Raspberry Ketone in Fragrance Mist after Pre-Column Derivatization with 4-Hydrazino-7-nitro-2,1,3-benzoxadiazole 4-肼-7-硝基-2,1,3-苯并恶二唑柱前衍生香雾中覆盆子酮的简单hplc -荧光测定

Journal of Analytical Sciences, Methods and Instrumentation Pub Date : 2016-06-08 DOI: 10.4236/JASMI.2016.62006

Y. Higashi

{"title":"Simple HPLC-Fluorescence Determination of Raspberry Ketone in Fragrance Mist after Pre-Column Derivatization with 4-Hydrazino-7-nitro-2,1,3-benzoxadiazole","authors":"Y. Higashi","doi":"10.4236/JASMI.2016.62006","DOIUrl":"https://doi.org/10.4236/JASMI.2016.62006","url":null,"abstract":"Raspberry ketone {RK, 4-(4-hydroxyphenyl)butan-2-one} is a natural compound contained in raspberry, and is added to cosmetics for skin whitening. It is very important to measure the RK level in cosmetics for quality assessment, since RK structurally resembles 4-(4-hydroxyphenyl)-2-butanol, which causes leukoderma on consumers’ skin. Here, we present a simple HPLC-fluorescence method for determination of RK in a fragrance mist by pre-column derivatization with 4-hydrazino-7-nitro-2,1,3-benzoxadiazole hydrazine (NBD-H), which reacts with the carbonyl group of RK. The NBD-RK derivative was eluted from a reversed-phase ODS column, and detected with excitation at 470 nm and emission at 550 nm. The retention time of NBD-RK derivative obtained by reaction with NBD-H at 80°C for 20 min was 10.3 min. The standard curve was linear in the range of 0.2 to 10 μg/mL, with a correlation coefficient (r2) value of 0.9980. The lower limit of detection was 0.018 μg/mL (absolute amount of 1.8 pmol). The coefficients of variation were less than 8.1%. The content of RK in fragrance mist (1.00 mL) was 1.18 ± 0.07 mg (range: 1.12 to 1.28 mg, n = 5). Recovery tests were satisfactory (83.9% ± 3.9%; range: 79.6 to 88.8%, n = 5).","PeriodicalId":14932,"journal":{"name":"Journal of Analytical Sciences, Methods and Instrumentation","volume":"1 1","pages":"44-49"},"PeriodicalIF":0.0,"publicationDate":"2016-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85582716","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: 3

A Potentiometric Evaluation of Stability Constants of Two-Step Overlapping Equilibria via a Bilogarithmic Hyperbolic Cosine Method 用双对数双曲余弦法求两步重叠平衡稳定性常数的电位法

Journal of Analytical Sciences, Methods and Instrumentation Pub Date : 2016-06-08 DOI: 10.4236/JASMI.2016.62005

S. Beaumont, Julia Martín, A. Asuero

引用次数: 1

Development of Highly Specific Enzyme Immunoassay for Monitoring Serum Digitoxin Level in Patients 用于监测患者血清地地黄毒素水平的高特异性酶免疫分析法的建立

Journal of Analytical Sciences, Methods and Instrumentation Pub Date : 2016-06-08 DOI: 10.4236/JASMI.2016.62003

Y. Higashi, Y. Ikeda, Mayumi Douno, Y. Fujii

{"title":"Development of Highly Specific Enzyme Immunoassay for Monitoring Serum Digitoxin Level in Patients","authors":"Y. Higashi, Y. Ikeda, Mayumi Douno, Y. Fujii","doi":"10.4236/JASMI.2016.62003","DOIUrl":"https://doi.org/10.4236/JASMI.2016.62003","url":null,"abstract":"We previously developed radioimmunoassays (RIAs) for digitoxin and digoxin using antisera raised against digitoxin 3’-hemisuccinate-bovine serum albumin and digoxin 3’-hemisuccinate-bovine serum albumin conjugates, respectively. Very recently, we converted the RIA for digoxin to an enzyme immunoassay (EIA) system. Here, we aimed to convert the RIA for digitoxin to an EIA suitable for measuring serum digitoxin level in patients, using digitoxin 3’-hemisuccinate-β-D-galactosidase as an enzyme-labeled antigen. The developed EIA showed a quantification range of 1 to 70 ng/mL and exhibited high specificity for digitoxin, with low cross-reactivity to digitoxin metabolites. Compared with a commercial anti-digitoxin antiserum clinically used to monitor serum digitoxin level in patients, our antiserum showed much higher specificity for intact digitoxin. Intra- and inter-assay variations were less than 10.0% and 8.5%, respectively. Recovery was within the range of 93.7% - 107.5%. Mean digitoxin concentrations measured in serum samples (n = 26) from digitoxin-treated patients by EIA using our new antiserum and the commercial anti-digitoxin antiserum were 11.0 and 13.8 ng/mL, respectively. The present EIA, which is superior to RIA in terms of convenience and disposal of waste materials, is expected to be practically useful for clinical monitoring of intact digitoxin in serum.","PeriodicalId":14932,"journal":{"name":"Journal of Analytical Sciences, Methods and Instrumentation","volume":"164 1","pages":"15-22"},"PeriodicalIF":0.0,"publicationDate":"2016-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77270446","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

Peculiarities of Erythrocytic Parameters in Patients with Nonalcoholic Steatohepatitis 非酒精性脂肪性肝炎患者红细胞参数的特点

Journal of Analytical Sciences, Methods and Instrumentation Pub Date : 2016-01-15 DOI: 10.4236/JASMI.2016.61002

M. Kruchinina, S. Kurilovich, Аndrey А. Gromov, V. Generalov, V. Kruchinin

{"title":"Peculiarities of Erythrocytic Parameters in Patients with Nonalcoholic Steatohepatitis","authors":"M. Kruchinina, S. Kurilovich, Аndrey А. Gromov, V. Generalov, V. Kruchinin","doi":"10.4236/JASMI.2016.61002","DOIUrl":"https://doi.org/10.4236/JASMI.2016.61002","url":null,"abstract":"Thirty-seven males with non-alcoholic staatohepatitis (NASH) (aged 39 - 62) were included in the study. Clinical, biochemical and instrumental studies were used to verify the diagnosis. The control group was comprised of thirty-three males of comparable age and without confirmed signs of liver diseases and other pathology of inner organs. Dielectrophoresis was applied to evaluate the structural-and-functional erythrocytic parameters. The patients with NASH erythrocytes tended to differ in their much lower amplitude deformation, polarizability, capacity of erythrocytic membranes, pace of translational motion of cells towards electrodes and much higher levels of overall indices of rigidity, viscosity, electroconductivity, destruction and aggregation as compared to the control group (p < 0.001 - 0.05). We discovered cases of correlation of erythrocytic parameters with biochemical findings reflecting inflammatory and cytolytic syndrome, cholestasis, protein-synthesizing liver function as well as markers of metabolic syndrome (BMI, changes in arterial blood pressure, the degree of disturbances in carbohydrate metabolism, atherogenic dyslipidemia) and microalbuminuria. Aggravation of microcirculatory disturbances leading to an increase of fibrogenes is induced by changes in the properties of erythrocytes under NASH suggests the administration of a number of therapeutic techniques which could improve the status of the parameters of red blood cells. This study aims to evaluate the peculiarities of electric and viscoelastic behavior of erythrocytes in patients with primary NASH in order to determine additional methods of treatment for this disease.","PeriodicalId":14932,"journal":{"name":"Journal of Analytical Sciences, Methods and Instrumentation","volume":"43 1","pages":"6-14"},"PeriodicalIF":0.0,"publicationDate":"2016-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88881499","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: 2

Essential Oil Composition of Artemisia scoparia Waldst. & Kitag from Qinghai-Tibetan Plateau of China 黄花蒿挥发油成分研究。&来自中国青藏高原的Kitag

Journal of Analytical Sciences, Methods and Instrumentation Pub Date : 2016-01-15 DOI: 10.4236/JASMI.2016.61001

Lihong Yao, H. Bo

引用次数: 1

General Relation Valid for Electrolytic Systems 对电解系统有效的一般关系

Journal of Analytical Sciences, Methods and Instrumentation Pub Date : 2015-12-14 DOI: 10.4236/JASMI.2015.54009

A. Michałowska-Kaczmarczyk, T. Michałowski

引用次数: 7

Determination of N and O-Atoms, of N2(A) and N2(X, v > 13) Metastable Molecules and N2+ Ion Densities in the Afterglows of Ar-N2 Microwave Discharges Ar-N2微波放电余辉中N和o原子、N2(A)和N2(X, v > 13)亚稳分子和N2+离子密度的测定

Journal of Analytical Sciences, Methods and Instrumentation Pub Date : 2015-12-14 DOI: 10.4236/JASMI.2015.54007

A. Ricard, H. Zerrouki, J. Sarrette

引用次数: 3

Solubility and Dissolution in Terms of Generalized Approach to Electrolytic Systems Principles 从电解系统原理的广义方法看溶解度和溶解

Journal of Analytical Sciences, Methods and Instrumentation Pub Date : 2015-12-14 DOI: 10.4236/JASMI.2015.54006

A. Michałowska-Kaczmarczyk, T. Michałowski, M. Toporek, A. Pietrzyk

引用次数: 4