Journal of Analytical Sciences, Methods and Instrumentation最新文献_第2页

CO2 Absorption Solvent Degradation Compound Identification Using Liquid Chromatography-Mass Spectrometry Quadrapole-Time of Flight (LCMSQTOF) 液相色谱-质谱四极柱-飞行时间(LCMSQTOF)法鉴定CO2吸收溶剂降解化合物

Journal of Analytical Sciences, Methods and Instrumentation Pub Date : 2020-09-16 DOI: 10.4236/JASMI.2020.103006

N. M. Yusop, Voon Chang Hong, Chan Zhe Phak, Zaimi Naim

{"title":"CO2 Absorption Solvent Degradation Compound Identification Using Liquid Chromatography-Mass Spectrometry Quadrapole-Time of Flight (LCMSQTOF)","authors":"N. M. Yusop, Voon Chang Hong, Chan Zhe Phak, Zaimi Naim","doi":"10.4236/JASMI.2020.103006","DOIUrl":"https://doi.org/10.4236/JASMI.2020.103006","url":null,"abstract":"The degradation of the alkanolamine solvent used in the removal of acid gases from natural gas streams due to exposure to contaminants, thermal degradation and presence of oxygen or oxygen containing compounds will change the solvent properties, such as heat transfer coefficient, diffusion coefficient, and mass transfer coefficient of the solvent. Therefore, characterization and quantification of amine degradation product becomes one of the important analyses to determine alkanolamine solvent’s health. In order to identify degradation products of alkanolamine solvent, analytical strategies by using mass spectrometry (MS) as detector have been studied extensively. In this work, due to the low concentration of the amine degradation product, a method was developed for identification of alkanolamine degradation products using LCMS-QTOF technique. A strategy for identification of trace degradation products has been identified. Six (6) alkanolamine degradation products had been identified by using LCMS-QTOF targeted analysis in the blended alkanolamine solvent used in natural gas processing plant. Another fifteen (15) molecular formulas having similarity in chemical structure to alkanolamine degradation products were identified using untargeted analysis strategy, as possible compounds related to degradation products. Using LCMS-QTOF via targeted and untargeted analysis strategy, without tedious column separation and reference standard, enables laboratory to provide a quick and indicative information for alkanolamine solvent’s organic degradation compounds identification in CO2 adsorption, within reasonable analysis time.","PeriodicalId":14932,"journal":{"name":"Journal of Analytical Sciences, Methods and Instrumentation","volume":"51 1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90150907","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

Method Optimization Study on Isolation of Volatile Compounds by Headspace Solid-Phase Microextraction (HS-SPME) from Custard Apple (Annona squamosa L.) Pulp. 顶空固相微萃取法(HS-SPME)分离蛋奶苹果(Annona squamosa L.)挥发物方法优化研究纸浆。

Journal of Analytical Sciences, Methods and Instrumentation Pub Date : 2020-09-16 DOI: 10.4236/JASMI.2020.103005

M. Galvão, K. L. Santana, Juliete Pedreira Nogueira, M. L. Neta, N. Narain

{"title":"Method Optimization Study on Isolation of Volatile Compounds by Headspace Solid-Phase Microextraction (HS-SPME) from Custard Apple (Annona squamosa L.) Pulp.","authors":"M. Galvão, K. L. Santana, Juliete Pedreira Nogueira, M. L. Neta, N. Narain","doi":"10.4236/JASMI.2020.103005","DOIUrl":"https://doi.org/10.4236/JASMI.2020.103005","url":null,"abstract":"Aroma is an important quality parameter, which can help in delaying degradative processes and hence understanding the volatile compounds that are part of an aroma is extremely important. Thus, the aim of this study was to isolate the volatile compounds present in custard apple (Annona squamosa L.) pulp by solid-phase microextraction (SPME) technique using 3 different fibers (DVB/CAR/PDMS, PDMS and PDMS/DVB). An experimental design was set up to evaluate the best extraction conditions wherein the variables were extraction temperature (minimum 28°C, maximum 62°C), ionic strength (minimum 0, maximum 30.0%) and sample concentration (min 1, max 99.0%). The separation of volatiles was achieved in chromatographic columns of different polarity (polar and non-polar) while identification of volatile compounds was performed by high resolution gas chromatography system coupled with mass spectrometry. The results obtained using 3 different fibers revealed the isolation of 71 compounds with fiber DVB/CAR/PDMS, while only 30 and 21 compounds were isolated using fibers PDMS/DVB and PDMS, respectively. The major classes of compounds identified were terpenes, esters, alcohols and aldehydes. Optimum conditions for obtaining higher number of volatiles for non-polar column were 45&degC for extraction temperature, 15% of sodium chloride and 50% of pulp amount which resulted in isolation of a maximum of 78 peaks.","PeriodicalId":14932,"journal":{"name":"Journal of Analytical Sciences, Methods and Instrumentation","volume":"42 1","pages":"720-726"},"PeriodicalIF":0.0,"publicationDate":"2020-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89399091","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

Introducing Adaptive Analysis Methods: The Present Analysis & Future Analysis 介绍自适应分析方法:当前分析与未来分析

Journal of Analytical Sciences, Methods and Instrumentation Pub Date : 2020-07-20 DOI: 10.4236/jasmi.2020.102004

Kunto Wibowo Agung Prodjonoto

引用次数: 2

Studies on the Thiol Components of Isolated Nuclei 离核硫醇组分的研究

Journal of Analytical Sciences, Methods and Instrumentation Pub Date : 2020-01-21 DOI: 10.4236/jasmi.2020.101003

M. Gronow

{"title":"Studies on the Thiol Components of Isolated Nuclei","authors":"M. Gronow","doi":"10.4236/jasmi.2020.101003","DOIUrl":"https://doi.org/10.4236/jasmi.2020.101003","url":null,"abstract":"The thiol components of the nonhistone proteins prepared from isolated nuclei from rat liver, regenerating liver and hepatoma 223 cells have been investigated after reaction with radio labelled N-ethylmaleimide and 5-5’-dithiobis-(2-nitrobenzoic acid) (DTNB). The labelled adducts formed were examined by isoelectric focusing analysis in polyacrylamide gel and the distribution of the radiolabels within sliced portions of the gels determined. In the case of the 14C labelled NEM adduct the label was found to be spread amongst numerous protein components within the gel however, in the case of the 35S labelled DTNB adducts, only a small proportion of the label was found in the protein material which was retained in the acidic isoelectric point (pI) region of the gel. The bulk of the 35S labelled adduct (56% - 60%) was found to have migrated into the anode solution (10 mM phosphoric acid). This could be adsorbed onto a hydrophobic resin (XAD2) resin and eluted with methanol. Gel filtration chromatographic analysis of this adduct material on BioGel P2, (exclusion limit 1500 daltons) showed low molecular weight components to be present. Slightly different patterns were obtained for these nuclei, each containing several 35S components with molecular weights greater than the Ellman reagent itself. These 35S labelled thiol components did not contain any protein, peptide or amino acid components indicating strongly that a novel species of thiols could be present in these nuclei bound within the non-histone protein matrices.","PeriodicalId":14932,"journal":{"name":"Journal of Analytical Sciences, Methods and Instrumentation","volume":"150 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90414260","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

Removal of Technetium (99Tc) from Aqueous Waste by Manganese Oxide Nanoparticles Loaded into Activated Carbon 活性炭负载氧化锰纳米颗粒去除水中废水中的锝(99Tc

Journal of Analytical Sciences, Methods and Instrumentation Pub Date : 2020-01-21 DOI: 10.4236/jasmi.2020.101002

W. Abdellah, H. El-Ahwany, R. El-Sheikh

{"title":"Removal of Technetium (99Tc) from Aqueous Waste by Manganese Oxide Nanoparticles Loaded into Activated Carbon","authors":"W. Abdellah, H. El-Ahwany, R. El-Sheikh","doi":"10.4236/jasmi.2020.101002","DOIUrl":"https://doi.org/10.4236/jasmi.2020.101002","url":null,"abstract":"Technetium-99 is a radioactive isotope with a half-life of 2.13 × 105 year. 99Tc is a significant contaminant of concern to the world. For this reason, a detailed understanding of technetium chemistry is essential for the protecting the public and the environment especially after increasing the various applications and uses of isotopes in the medical practices. Therefore, treatment of waste increases prior to the safe discharge to the environment or the storage. The sorption of technetium in the form of pertechnetate on a nano manganese oxide loaded into activated carbon has been investigated. Nano manganese oxide (NMO) was synthesized from manganese chloride and potassium permanganate by co-precipitation and forming a new composite by loading a nanoparticle into a modified activated carbon by different ratios. Modifications of activated carbons using different concentrations of HNO3 (4 M, 6 M and 8 M) are used in prepared composites. Fourier transform infrared spectroscopy (FT-IR), X-Ray Diffraction (XRD) and Scanning Electron Microscope (SEM) were used to characterize the prepared composites. The adsorption of anions from low level radioactive aqueous waste was examined using batch technique. Different parameters affecting on the adsorption process were studied for the removal of . The results revealed that NMO/AC (4 M, 6 M and 8 M) has a high adsorption efficiency (93.57%, 90.3% and 90.3%) respectively compared to NMO and AC which have a lower adsorption efficiency (41% and 38.9%) respectively. Moreover, the adsorption isotherm belonged to Freundlich model, the adsorption data followed pseudo-second order model and the thermodynamic study indicated that the adsorption of on Nano-composites was an exothermic and spontaneous process.","PeriodicalId":14932,"journal":{"name":"Journal of Analytical Sciences, Methods and Instrumentation","volume":"163 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86450748","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

Effective Antibiotic Stewardship Program: Controlling Antibiotic Resistance and Optimizing Drug Use in Ahmadi Hospital 有效的抗生素管理方案:控制抗生素耐药性和优化药物使用在艾哈迈迪医院

Journal of Analytical Sciences, Methods and Instrumentation Pub Date : 2020-01-21 DOI: 10.4236/jasmi.2020.101001

S. Alajmi, Wadha Almarri

{"title":"Effective Antibiotic Stewardship Program: Controlling Antibiotic Resistance and Optimizing Drug Use in Ahmadi Hospital","authors":"S. Alajmi, Wadha Almarri","doi":"10.4236/jasmi.2020.101001","DOIUrl":"https://doi.org/10.4236/jasmi.2020.101001","url":null,"abstract":"An Antimicrobial Stewardship Program (ASP) is established to promote cost effective and safe use of antimicrobial agents. Basically, this approach directs the management of antimicrobials in terms of selection of appropriate drugs, determination of administration routes and standardization of both medication dosage and treatment duration. The program involves, but is not limited to, Hospital Staff Education, Pharmacodynamics Dose Optimization, Computer-Assisted Decision Support Programs, Pharmacist-Driven Intravenous to Oral Switch Programs, Pharmacy Dosing Programs and Antibiotic Cycling. A study was conducted to determine effectiveness of the ASP in significantly improving patient outcomes (e.g. decrease morbidity and mortality from infection). This was undertaken by collecting restrospective data on patient length of hospital stay, bed turnover rate and antibiotic consumption over a period of 2 years since the ASP was initiated. Periodic data were then compared and interpreted based on its clinical, quality and financial implications in order to measure effectiveness of the program implementation.","PeriodicalId":14932,"journal":{"name":"Journal of Analytical Sciences, Methods and Instrumentation","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90581836","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

Determination of Fluoride in Various Samples Using a Fluoride Selective Electrode 用氟选择电极测定各种样品中的氟

Journal of Analytical Sciences, Methods and Instrumentation Pub Date : 2020-01-01 DOI: 10.4236/jasmi.2020.104007

Kamal Shaiyad Miya, V. Jha

引用次数: 2

Consideration of Size and Dimension in the Evaluation of Transfers during Convective Drying of Sweet Potato 红薯对流干燥过程中转移评价中尺寸的考虑

Journal of Analytical Sciences, Methods and Instrumentation Pub Date : 2020-01-01 DOI: 10.4236/jasmi.2020.104008

Abdou-Salam Ganame, Kondia Honoré Ouoba, F. Zougmore

引用次数: 3

Decomposition of Anthraquinone Vat Yellow 1 Using Zinc Oxide Photocatalyst 用氧化锌光催化剂分解蒽醌还原黄1

Journal of Analytical Sciences, Methods and Instrumentation Pub Date : 2019-12-26 DOI: 10.4236/jasmi.2019.94007

Aba Akebi Atta-Eyison

引用次数: 0

A novel method for Isolating Nanocrystalline Cellulose from Eucalyptus Hardwood 从桉树硬木中分离纳米晶纤维素的新方法

Journal of Analytical Sciences, Methods and Instrumentation Pub Date : 2019-09-17 DOI: 10.4236/jasmi.2019.93006

Jinrong Zhang, Wenbo Zou

{"title":"A novel method for Isolating Nanocrystalline Cellulose from Eucalyptus Hardwood","authors":"Jinrong Zhang, Wenbo Zou","doi":"10.4236/jasmi.2019.93006","DOIUrl":"https://doi.org/10.4236/jasmi.2019.93006","url":null,"abstract":"The objective of this work is to develop a new method for extracting nanocrystalline \u0000cellulose (CNC) from eucalyptus. CNC was isolated from eucalyptus \u0000using 6:4 (v/v) tetrahydrofuran/water. The chemical and crystalline \u0000structure of the isolated CNC was characterized by zeta potential measurements, \u0000Fourier Transform Infrared (FT-IR) and UV-Vis spectroscopies, and \u0000X-ray powder diffractometry. The CNC morphology was characterized by \u0000Transmission Electron Microscope (TEM) and particle size of CNC was determined \u0000by the Dynamic Light Scattering (DLS) method. Cytotoxicity and \u0000zebrafish-toxicity experiments were also performed on CNC. The yield of \u0000CNC using the new extraction method was about 41%, and the extracted \u0000CNC particles were about 20 nm in diameter and about 40 nm long, on average. \u0000The zeta potential of the CNC was determined to be -56 eV and the CN \u0000particles were uniformly distributed in a suspension of 0.5 wt%. The prepared \u0000CNC was a type I polymorph with an intact crystal structure. Toxicity results \u0000revealed that 0.5 wt% is a safe CNC concentration, and that 2.5 mg/mL CNC \u0000is not teratogenic or lethal to zebrafish embryos or juveniles. The new extraction \u0000method developed in this study is environmentally friendly, and easy to \u0000operate with relatively low cost.","PeriodicalId":14932,"journal":{"name":"Journal of Analytical Sciences, Methods and Instrumentation","volume":"81 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83887778","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