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Its abbreviated title&nbsp;(CAS&nbsp;Source Index)&nbsp;is&nbsp;<em>Orbital: Electron. J. Chem</em>., which should be used in bibliographical references.</p> <p style="text-align: justify;"><span style="font-family: 'Noto Sans', Arial, Helvetica, sans-serif; text-align: center;">Please, like our&nbsp;</span><a style="font-family: 'Noto Sans', Arial, Helvetica, sans-serif; text-align: center;" href="https://www.facebook.com/Orbital-The-Electronic-Journal-of-Chemistry-918258038195367/">facebook page</a><span style="font-family: 'Noto Sans', Arial, Helvetica, sans-serif; text-align: center;">. Follow us on&nbsp;</span><a style="font-family: 'Noto Sans', Arial, Helvetica, sans-serif; text-align: center;" href="https://twitter.com/Orbital_EJC" target="????????D_blank">Twitter</a><span style="font-family: 'Noto Sans', Arial, Helvetica, sans-serif; text-align: center;">&nbsp;and&nbsp;</span><a style="font-family: 'Noto Sans', Arial, Helvetica, sans-serif; text-align: center;" href="https://www.instagram.com/orbitalejc/" target="_blank" rel="noopener">Instagram</a></p> </div> <!-- Go to www.addthis.com/dashboard to customize your tools --> en-US <p>&nbsp;</p> <ul> <li class="show"> <p>Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a&nbsp;<a href="https://creativecommons.org/licenses/by-nc-nd/4.0" target="_blank" rel="noopener">Creative Commons Attribution License</a>&nbsp;that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.</p> </li> <li class="show"> <p>Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.</p> </li> <li class="show"> <p>Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See&nbsp;<a href="http://opcit.eprints.org/oacitation-biblio.html" target="_new">The Effect of Open Access</a>).</p> </li> </ul> <p>&nbsp;</p> editor.orbital@ufms.br (Adilson Beatriz) marcos.amaral@ufms.br (Marcos Serrou do Amaral) Sun, 17 Jul 2022 19:46:02 +0000 OJS 3.1.2.1 http://blogs.law.harvard.edu/tech/rss 60 Determination of Nicotine in Cigarette Tobacco Smuggled to Brazil by Modified QuEChERS Methodology https://periodicos.ufms.br/index.php/orbital/article/view/16188 <p>The study of cigarette authenticity in Brazil is important due to increasing consumption of contraband cigarettes. Nicotine concentration is an important parameter reflecting the quality of tobacco used in the production of these cigarettes. Simple methods for this determination, which produce reduced waste, are environmentally and industrially important. The nicotine concentration of smuggled cigarette tobacco was determined by the QuEChERS method, requiring some modifications, such as decreasing the volume of the extractor solvent, changes in pH, and removal of the sample hydration step. Quantification was performed by gas chromatography using a flame ionization detector. The Doehlert matrix design was used to optimize the method. The extraction recoveries ranged from 97.5% to 99.6%, with relative standard deviation (RSD) ≤ 2.5% and limits of detection and quantification of 0.6 mg L<sup>-1</sup> and 2.5 mg L<sup>-1</sup>, respectively. The method was sensitive and accurate for the detection and quantification of nicotine. The nicotine concentration in contraband cigarettes was found to be lower than that observed in legal cigarettes. The method was successfully applied to real samples of smuggled and legal cigarettes, providing a robust method for routine analysis and proving the need for more studies on quality control of smuggled cigarettes in Brazil.</p> Cinthia Eloise Domingues, Januário Kordiak, Carlos R. Pedroso, Tatiana R. de Oliveira Stremel, Rosimara Zittel, Patrícia Los Weinert, Carlos M. de Sousa Vidal, Sandro X. de Campos Copyright (c) 2022 Orbital: The Electronic Journal of Chemistry https://creativecommons.org/licenses/by-nc-nd/4.0 https://periodicos.ufms.br/index.php/orbital/article/view/16188 Sat, 02 Jul 2022 20:25:36 +0000 Hydrogenation of Biomass-derived 5-hydroxymethylfurfural (HMF) over Pd Catalysts in Aqueous Medium https://periodicos.ufms.br/index.php/orbital/article/view/15596 <p style="text-align: justify;">We hydrogenated biomass-derived 5-hydroxymethylfurfural (HMF) in aqueous medium in a reaction catalyzed by palladium nanoparticles (Pd) on carbonaceous materials with different morphology and hydrophobic degree. The Pd catalysts were prepared by dipping the carbonaceous material into a Pd<sup>0</sup> micro-emulsion. The catalyst support affected catalytic HMF hydrogenation. By using micrometric active carbon (AC) combined with cup-stacked carbon nanotubes (CSCNTs) and Pd, we obtained a micro/nanostructured material designated Pd/CSCNT-AC, which performed better than the other carbonaceous materials containing similar Pd loading. Pd/CSCNT-AC catalyzed HMF hydrogenation at the C=O double bond more selectively, giving between 85% and 99% selectivity toward 2,5-bis(hydroxymethyl)furan (BHMF). We also investigated how temperature, hydrogen pressure, and reaction time affected HMF hydrogenation.</p> Wesley Romário da Silva, José Maurício Rosolen, Paulo Marcos Donate Copyright (c) 2022 Orbital: The Electronic Journal of Chemistry https://creativecommons.org/licenses/by-nc-nd/4.0 https://periodicos.ufms.br/index.php/orbital/article/view/15596 Sun, 03 Jul 2022 02:41:11 +0000 The Efficacy of New Liquid Laser Dye Material – Chalcone: 1-(4-methylsulfonyl phenyl)-3-(4-N,N-dimethyl (amino phenyl)-2-propen-1-one (MSPPP) https://periodicos.ufms.br/index.php/orbital/article/view/16192 <p>This paper includes the efficacy of synthesis and characterization of a new liquid laser dye material – chalcone of 1-(4-methylsulfonyl phenyl)-3-(4-<em>N,N</em>-dimethyl (amino phenyl)-2-propen-1-one (MSPPP) and its application as a new laser medium. The absorption and fluorescence spectra of MSPPP were investigated under different solvents and concentrations. The study investigated the pump pulse energies of Nd: YAG laser (355 nm) and the amplified spontaneous emission (ASE) performance of MSPPP under various concentrations, and organic solvents. At identical conditions, the amplified spontaneous emission spectra of MSPPP in solution were compared with a conventional laser dye of coumarin 503. The fluorescence quantum yield and the gain of MSPPP were determined. The features are: (I) MSPPP has stellar photochemical stabilization., (II) ASE from the MSPPP was setting in the wavelength range between 515 and 548 nm. The molecular geometry was optimized and their HOMO– LUMO energy values were determined by SCM Software for Chemistry &amp; Materials using DFTB (GGA BLYP) [Density-Functional based Tight-Binding] method.</p> Mohana Faroug Attia, Abdelrahman A. Elbadawi Copyright (c) 2022 Orbital: The Electronic Journal of Chemistry https://creativecommons.org/licenses/by-nc-nd/4.0 https://periodicos.ufms.br/index.php/orbital/article/view/16192 Mon, 04 Jul 2022 01:43:14 +0000 Chemical composition and photoprotective potential of aqueous extract from Casearia sylvestris var. lingua (Cambess.) Eichler leaves https://periodicos.ufms.br/index.php/orbital/article/view/15578 <p><em>Casearia sylvestris</em> var. lingua (Cambess.) Eichler is widely used in traditional medicine to treat diseases. Simultaneously, the growing search for phytocosmetics has culminated in the exploration of plant extracts. In this context, the aim of this study was to obtain the chemical composition and antioxidant and photoprotective potential of the infusion of <em>C. sylvestris</em> var. <em>lingua </em>leaves. The techniques of UV/Vis spectroscopy, gas chromatography with mass spectrometry detector (GC-MS) and liquid chromatography with diode array detector (LC-DAD) were used to get the results. The total phenolic content in the infusion of leaves from <em>C. sylvestris</em> var. lingu<em>a</em> was 101.57 mg GAE g<sup>-1</sup>, flavonoids 50.37 mg RE g<sup>-1</sup> and tannins 1.12 mg TAE g<sup>-1</sup>. Quercetin, ferulic acid, gallic acid, ellagic acid, caffeic acid, β-sitosterol, lupeol, lupeol acetate, stigmasterol and campesterol were identified and quantified in the samples. The infusion of <em>C. sylvestris</em> var. lingua leaves has potential for application in phytocosmetics and sunscreens, with a sun protection factor of 8.65 ± 0.45, a UVA/UVB ratio of 1.16 and a critical wavelength of 373.</p> Claudia Andrea Lima Cardoso, Thiago Luis Aguayo de Castro, André Luís Duarte Goneli, Maria Helena Verdan Copyright (c) 2022 Orbital: The Electronic Journal of Chemistry https://creativecommons.org/licenses/by-nc-nd/4.0 https://periodicos.ufms.br/index.php/orbital/article/view/15578 Mon, 04 Jul 2022 19:30:37 +0000 Effects of Different Irrigation Solutions on the Chemical Composition of Multi-Root Canals of Radicular Dentine in Upper Premolar Teeth https://periodicos.ufms.br/index.php/orbital/article/view/16204 <p>The objective of this research was to assess the effects of several irrigation solutions (ISOLs) on two major (P and Ca) and some minor (Fe, Zn, and Sr) elements of multi-root canals of radicular dentin in upper premolar teeth using X-ray fluorescence analysis (XRF). Powder of fifty radicular dentin specimens were prepared and divided into five groups based on treatments with different single and combined ISOLs. These groups were: G1-distilled water (control); G2- sodium hypochlorite (NaOCl, 5.25%); G3- sodium hypochlorite (NaOCl, 5.25%) and ethylendiaminetetraacetic acid (EDTA, 17%); G4- distilled water and a mixture of tetracycline, an acid, and a detergent (MTAD); and G5- sodium hypochlorite (NaOCl, 1.3%) and MTAD. The XRF results confirmed that the ISOL G5 (Ca/P=1.6254) was the most effective one. The ratio-to-ratio correlations revealed the common origins of Fe, Zn, and Sr in root canals of radicular dentin, which was highly interacted with the major elements of P and Ca each. These interactions were insignificantly affected by the used ISOLs. Finally, XRF is highly recommended as a safe, fast, nondestructive, and relatively not expensive technique to analyze the endodontic therapy of teeth.</p> Morgana Quteifani Quteifan, Ali Khuder Copyright (c) 2022 Orbital: The Electronic Journal of Chemistry https://creativecommons.org/licenses/by-nc-nd/4.0 https://periodicos.ufms.br/index.php/orbital/article/view/16204 Wed, 06 Jul 2022 14:49:11 +0000 Structural and Morphological Study of PbS:ZnO Nanowires Films Deposited Using Thermal Evaporation Method https://periodicos.ufms.br/index.php/orbital/article/view/16217 <p>We obtained ZnO Nanowires films deposited on two types of substrate (Si (100) and glass) with 12 wt % PbS as dopant by simple thermal evaporation technique. High Resolution Transmission Electron Microscopy (HRTEM) and Energy-dispersive X-ray spectroscopy(EDX) images have confirmed the formation of ZnO Nanowires (NWs). EDX technique was used to investigate the elements content (standard analysis and mapping modes). Morphology and thickness of the films were investigated from surface and cross section of the films via Scanning Electron Microscopy (SEM) images. The Raman, photoluminescence (PL) and X-ray Diffraction (XRD) have confirmed the hexagonal phase structure of the ZnO Nanowires, which appeared to be very fine and their diameters were less than 40 nm and their lengths were of several micrometers using SEM and HRTEM. The effect of PbS as dopant on the growth of ZnO Nanowires as well as on the morphology for two substrates was investigated and compared. These Nanowires films could be applied in several fields. Mapping -EDX has confirmed the stoichiometry of prepared films. Finally, the structure (phase) was verified by different characterization techniques. The optoelectronic application of Nanostructures film will be study later.</p> Bassam Abdallah, M. Kakhia, W. Zetoun Copyright (c) 2022 Orbital: The Electronic Journal of Chemistry https://creativecommons.org/licenses/by-nc-nd/4.0 https://periodicos.ufms.br/index.php/orbital/article/view/16217 Fri, 08 Jul 2022 21:19:34 +0000 Ion Chromatography: Principles and instrumentation https://periodicos.ufms.br/index.php/orbital/article/view/15871 <p>Ion chromatography (IC) is one of the most used analytical methods for the determination of inorganic cations and anions, as well as organic ions. It is considered a method of separation with simple steps, low cost and with good efficiency in chromatographic separation. In addition, it has good validation metrics such as sensitivity, selectivity, precision, robustness, low detection limit and quantification. IC easily replaces conventional wet chemistry methods, which tend to have more analysis steps. The easy extraction of samples, in most cases, does not require organic solvents, facilitating the disposal of waste. Since its creation, IC has accumulated advantages and good acceptance in the food, pharmaceutical, environmental monitoring industries, in addition to increasing implementation in academic research laboratories.</p> Alexandre Varão Moura, José Domingos Santos da Silva, Priscila Gubert Copyright (c) 2022 Orbital: The Electronic Journal of Chemistry https://creativecommons.org/licenses/by-nc-nd/4.0 https://periodicos.ufms.br/index.php/orbital/article/view/15871 Thu, 07 Jul 2022 00:00:00 +0000 Development of Gamification-Based Wordwall Game Platform on Reaction Rate Materials https://periodicos.ufms.br/index.php/orbital/article/view/16206 <p>The purpose of this study was (1) to determine the development of a wordwall game platform on the reaction rate material, (2) to determine the feasibility of a gameification-based wordwall game platform from the results of validator and respondent data. wordwall is an application that can be used as a learning media, learning resource or online-based assessment tool that is attractive to students. The advantage of this application is that it has many templates that teachers can create to develop in the form of games. Wordwall is rarely used in learning media because there has not been socialization and application in the teaching and learning process for teachers. In this study, media development was carried out using wordwall applications on chemicals, namely the reaction rate that will be studied by students. This material contains the concept of reaction rate, factors that affect reaction rate, collision theory and reaction rate equations. The novelty of this study compared to existing research is that this research develops a wordwall medium that focuses on increasing students' interest in learning materials, especially chemistry in the online-based teaching and learning process.The wordwall media validators were 2 lecturers from Nusa Cendana University and the question validators were validated by 2 teachers at SMAN 3 Sidoarjo. The trial subjects were 37 students of high school class XI at SMAN 3 Sidoarjo. The research method used is R&amp;D from the Alessi and Trollip model. Data collection using a google form-based questionnaire filled out online and test results. The data were analyzed by qualitative descriptive and percentage calculation. The results obtained: (1) the value of the validity of the material questions is 90%, (2) the value of media validity is 94%, and (3) the student implementation test score is 81.75%.</p> Jacky Anggara Nenohai; Deni Ainur Rokhim, Nur Indah Agustina, Munzil Munzil Copyright (c) 2022 Orbital: The Electronic Journal of Chemistry https://creativecommons.org/licenses/by-nc-nd/4.0 https://periodicos.ufms.br/index.php/orbital/article/view/16206 Wed, 06 Jul 2022 00:00:00 +0000 The Confusion Between Intravenous Sodium Chloride and Potassium Chloride: A Potential Application for a Problem Based Learning (PBL) in Nursing Education to Minimize Medication Errors https://periodicos.ufms.br/index.php/orbital/article/view/16222 <p>Sodium chloride and potassium chloride are two metal halides easily distinguishable by chemistry students.&nbsp; Nevertheless, it has been shown that the confusion between sodium chloride and potassium chloride is the underlaying cause of serious medical mistakes that may potentially culminate with the death of the patient.&nbsp; In the present literature review, a qualitative approach is used to examine relevant teaching practices, such as a problem base learning (PBL) approach that could be integrated in the undergraduate chemistry curriculum for nursing students to minimize the confusion between the two chemicals.</p> Luca D'Ottone Copyright (c) 2022 Orbital: The Electronic Journal of Chemistry https://creativecommons.org/licenses/by-nc-nd/4.0 https://periodicos.ufms.br/index.php/orbital/article/view/16222 Sat, 09 Jul 2022 00:00:00 +0000 Let's Talk About Stereochemistry for a Moment: a Home Experiment Conducted with College Students in Social Isolation https://periodicos.ufms.br/index.php/orbital/article/view/16224 <p>Due to COVID-19, we are adjusting to a new educational environment while also being socially isolated. By combining previously established ways of remote education with video conferences, the world is creating a new sector termed techno-pedagogy. The concept of stereochemistry in Organic Chemistry is frequently difficult to understand even in classroom teaching. Plane-polarized light rotation is difficult to describe because it needs a high level of abstraction in the mental exercise. As a result, we propose in this work that technology be developed to teach stereochemistry remotely. As a result, we prepared a training video that shows college students how to execute a hand-made stereochemistry experiment. Lecturers, undergraduates, and graduate students all gave the video great scores.</p> Pamella Moreira Monte, Jose C. Barros, Tiago Lima da Silva Copyright (c) 2022 Orbital: The Electronic Journal of Chemistry https://creativecommons.org/licenses/by-nc-nd/4.0 https://periodicos.ufms.br/index.php/orbital/article/view/16224 Sun, 10 Jul 2022 00:00:00 +0000 Synthesis and Solvatochromism of Oxazolone Derivative: Combining Organic Synthesis and Physical Organic Chemistry in a Single Experiment https://periodicos.ufms.br/index.php/orbital/article/view/16293 <p>This work presents a proposal of experimental activity involving organic synthesis and solvatochromism of an organic molecule, correlating the content of organic chemistry and physical organic chemistry. This experiment presents a good opportunity to work with the classroom some of the content related to the mechanisms of organic reactions and the relationship between energy, electronic states, solute-solvent interactions, spectroscopy, among others in the area of physical chemistry, thus integrating knowledge. Experimentally, we synthesized through the Plöchl-Erlenmeyer method the oxazolonic derivative 4-[(p-N,N-dimethylamino)benzylidene]-2-phenyloxazole-5-one (AZA2) with good yield (78%), while the solvatochromic study showed that this derivative presented reverse solvatochromism; since in non-hydroxyl solvents it presented positive solvatochromism, but in protic solvents it presented negative solvatochromism. These different behaviors can be justified by the different solute-solvent interactions existing in each medium, which favors the prevalence of different mesomeric structures.</p> Taianne D’Angelo Korb, Lucia Helena Franco Martires da Costa, Mauricio Ferreira da Rosa Copyright (c) 2022 Orbital: The Electronic Journal of Chemistry https://creativecommons.org/licenses/by-nc-nd/4.0 https://periodicos.ufms.br/index.php/orbital/article/view/16293 Sun, 17 Jul 2022 00:00:00 +0000