Journal of Analytical Sciences, Methods and Instrumentation

Journal Information
ISSN / EISSN : 2164-2745 / 2164-2753
Published by: Scientific Research Publishing, Inc. (10.4236)
Total articles ≅ 138
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Latest articles in this journal

David Abiodun Ogunlade, John Perkins, Favour Nakawooya, Froylan Cannon Gracias
Journal of Analytical Sciences, Methods and Instrumentation, Volume 12, pp 1-24; https://doi.org/10.4236/jasmi.2022.121001

Abstract:
This project investigated the potential optimal development strategy for a saturated reservoir, with a gas cap. It assessed the viability of three production methods—solution gas drive (primary depletion), water flooding and gas injection, using varying injector well numbers. This project also undertook sensitivity analysis in the field, concluding that the development of another appraisal well would vastly improve the accuracy of NPV calculation. Furthermore, this project ascertained an optimized recovery method, based on numerical production simulations and economic modelling, of initial solution gas drive recovery, until reservoir pressure equals the bubble point pressure, at which point three water flooding injectors should be employed, developed at six-month intervals to maximise production while limiting CAPEX and OPEX as much as possible.
Shimaa A. Mahmoud, Amira M. El-Kosasy, Fatma A. Fouad
Journal of Analytical Sciences, Methods and Instrumentation, Volume 11, pp 29-45; https://doi.org/10.4236/jasmi.2021.114004

Abstract:
Eco-friendly Ultra-high-performance liquid chromatography (UHPLC) with green aqueous-organic mobile phase was applied for the simultaneous determination of febuxostat (FEB) and diclofenac (DIC) with the composition of water:ethanol (85:15 v/v) utilizing phenomenex Kinetex C18 column (4.6 × 100 mm 2.6 μm), flow rate 1 ml/min and UV detection at 280 nm with linear ranges of 0.4 - 4.0 μg/mL and 0.5 - 5.0 μg/mL for FEB and DIC, respectively. The proposed method was also successfully applied to analyze the two drugs in pharmaceutical dosage form and human plasma. The results obtained were validated and statistically analyzed and found to be in accordance with those given by reported methods. Moreover, the greenness of the developed method is assessed using suitable analytical Eco-Scale and GAPI tools and comparison with the previously published methods have been carried out to indicate the priority of the proposed method. UHPLC is considered eco-friendly method regarding uses of safe solvents, simple, accurate and short time of analysis.
Gunat J. Lekduhur, Peter O. Onuwa, Ishaq S. Eneji, Sha’Ato Rufus
Journal of Analytical Sciences, Methods and Instrumentation, Volume 11, pp 1-13; https://doi.org/10.4236/jasmi.2021.111001

Abstract:
Honey bees derive their nutrients from nectars and other plant materials. These naturally available materials are affected by the residual presence of pesticides. The concentration of pesticides in honey comb then reflects the leftover after degradation. In this study, samples of honey were collected from five different farms in Plateau State and analyzed for pesticide residues (atrazine, cypermethrin) and heavy metals (Pb, Cd, Cr, Fe and Mn) using GC-MS and AAS techniques. Results of the analysis indicated that atrazine and cypermethrin were found in the range (0.01 - 0.36 and 0.11 - 0.26) mg/kg, respectively in all the samples. Mn and Fe were found across the samples while Cd was detected only in the sample obtained from Maraban Jos (0.0013 mg/kg). Except Bokkos and Maraban Jos, Pb was detected in other samples. This study revealed that all samples contained the selected pesticide residues above the maximum residue limits recommended by European Union, while concentration of heavy metals in all the samples except Mn was below the maximum concentration limits recommended by Food and Agriculture Organization. The high concentration of pesticide residues in the samples indicates contaminated environment in which the bees fed; therefore intermittent monitoring of the quality of honeys produced would be necessary as this calls for urgent attention.
Dang Hong Ngoc Quy, Pham Ngoc Son, Phan Bao Quoc Hieu, Trinh Van Cuong
Journal of Analytical Sciences, Methods and Instrumentation, Volume 11, pp 23-28; https://doi.org/10.4236/jasmi.2021.113003

Abstract:
The objective of this study is to design an elastic neutron scattering system according to the angle with a sample using thermal neutron beam at the Dalat Nuclear Reactor (DNR). The system is used for research and training in the field of material structure analysis by neutron scattering and diffraction techniques. It is designed on the basis of inheriting the neutron measurement spectrometer systems at the DNR and the scattered neutron measurement systems in the world. The measuring system, which was installed at the horizontal channel 4 of the DNR, consists of 5-helium-3 detectors and a fully electronic system to record the scatter counts and a mechanical system with the possibility of rotating at 15˚-75˚ angles. The constructed system is tested for evaluation of the accuracy, stability and reliability of the mechanical and electronic systems of moving detectors by angles.
Onyinyechi Rita Chinedu, Chikaodili Benedine Nwizuzu
Journal of Analytical Sciences, Methods and Instrumentation, Volume 11, pp 15-22; https://doi.org/10.4236/jasmi.2021.112002

Abstract:
The study intended to determine the relationship between locus of control and academic achievement of secondary school students. Some students have been observed to achieve higher while some achieve lower even after being exposed to the same subject matter by the same instructor. The objective of the study was to determine if locus of control correlated with academic achievement of students as moderated by gender and school-type. The study was anchored on attribution theory. The study adopted a correlational research design. A total of 388 SS3 students in Aba Education zone were selected using purposive and simple random sampling techniques. Instruments for data collection were an adopted LOC scale and students’ exam scores in Mathematics, English and CRS. To determine the reliability of the instrument, Kuder-Richardson reliability test (KR-20) was employed and an overall coefficient of 0.76 was obtained for LOC scale. Data were analyzed using Pearson Product Moment Correlation Coefficient. Results showed significant relationship between locus of control and academic achievement of male students. Results also showed significant relationship between locus of control and academic achievement of public school students. Based on the findings, it was recommended that school authority should encourage good performance by rewarding students with excellent performance, because when good behaviour is rewarded, the individual is motivated to do better. Also, government should also provide the schools with necessary infrastructures that would make teaching and learning very interesting.
Abdou-Salam Ganame, Kondia Honore Ouoba, François Zougmore
Journal of Analytical Sciences, Methods and Instrumentation, Volume 10, pp 104-112; https://doi.org/10.4236/jasmi.2020.104008

Abstract:
This work is interested in solving the complex problem of understanding mass transfers in biological media. The contribution of the initial sample size is taken into account. Transfers are established more efficiently in small samples. Thus, from the first 50 minutes, the cubic sample at 1 cm stop is already at 50% while the sample at 4 cm edge is at about 90% of its initial water content. Likewise the shape is combined with the size. But it is revealed that if we fix similar characteristic dimensions, we can bypass the notion of initial shape. Thus the cubic samples 4 cm of edges. 4 cm diameter of spherical shape, 4 cm × 4 cm height-diameter cylindrical one, all dry identically.
Saud M. Alajmi, Wadha N. Almarri
Journal of Analytical Sciences, Methods and Instrumentation, Volume 10, pp 1-11; https://doi.org/10.4236/jasmi.2020.101001

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.
Mércia De Sousa Galvão, Karen Leticia de Santana, Juliete Pedreira Nogueira, Maria Terezinha Santos Leite Neta, Narendra Narain
Journal of Analytical Sciences, Methods and Instrumentation, Volume 10, pp 59-77; https://doi.org/10.4236/jasmi.2020.103005

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°C for extraction temperature, 15% of sodium chloride and 50% of pulp amount which resulted in isolation of a maximum of 78 peaks.
Kunto Wibowo Agung Prodjonoto
Journal of Analytical Sciences, Methods and Instrumentation, Volume 10, pp 43-57; https://doi.org/10.4236/jasmi.2020.102004

Abstract:
Mastery of theory, analysis, approach models and decision making, is increasingly important, so finding analytical methods to achieve something better is a logical consequence. For this reason, adaptive analysis method is introduced, which is a method of dynamizing SWOT analysis using commutative properties with the operation of the cross-axis coordinate (X; Y), based on the theory of lines and rules of a sword, phenomenal, natural and relevant, to obtain a grand strategy chosen as a unified strategy like two sides of a coin. The method used is the theoretical and empirical study of adaptive analysis on one of the global issues, namely phenomenal terrorism until now. It is hoped that this method can be used in a variety of problems and is highly determined how a talent plays a role and is not intended to criticize existing analytical methods that have been used.
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