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Publisher: Universidade Federal de Mato Grosso do Sul (Total: 1 journals) [Sort by number of followers]

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	Orbital - The Electronic J. of Chemistry (Followers: 1)

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Orbital - The Electronic Journal of Chemistry
Number of Followers: 1

This is an Open Access Journal

Open Access journal
ISSN (Print) 1984-6428 - ISSN (Online) 1984-6428
Published by Universidade Federal de Mato Grosso do Sul

[1 journal]

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)
- Authors: Mohana Faroug Attia
  Abstract: This paper includes the efficacy of synthesis and characterization of a new liquid laser dye material – chalcone of 1-(4-methylsulfonyl phenyl)-3-(4-N, N 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, organic solvents. At the same 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.
  PubDate: 2022-09-25
  Issue No: Vol. 14 (2022)
Effects of Different Irrigation Solutions on the Chemical Composition of
Multi-Root Canals of Radicular Dentine in Upper Premolar Teeth
- Authors: Morgana Quteifani Quteifan, Ali Khuder
  Abstract: 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.
  PubDate: 2022-09-25
  Issue No: Vol. 14 (2022)
SYNTHESIS AND SOLVATOCHROMISM OF OXAZOLONE DERIVATIVES: COMBINING ORGANIC
SYNTHESIS AND PHYSICAL ORGANIC CHEMISTRY IN A SINGLE EXPERIMENT
- Authors: Mauricio Ferreira da Rosa, Taianne D'Angelo dos Santos, Lucia Helena Franco Mártires da Costa
  Abstract: 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 (DMPO) 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.
  PubDate: 2022-09-25
  Issue No: Vol. 14 (2022)
DEVELOPMENT OF GAMIFICATION-BASED WORDWALL GAME PLATFORM ON REACTION RATE
MATERIALS
- Authors: Jacky Anggara Nenohai, Deni Ainur Rokhim, Nur Indah Agustina, Munzil Munzil
  Abstract: 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. 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 class XI at SMAN 3 Sidoarjo. The research method used is R&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%.
  PubDate: 2022-09-25
  Issue No: Vol. 14 (2022)
Undergraduate Chemistry Curriculum for Nursing Students: A Potential
Application for a Problem Based Learning (PBL) Approach
- Authors: LUCA DOTTONE
  Abstract: Sodium chloride and potassium chloride are two metal halides easily distinguishable by chemistry students. 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. 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.
  PubDate: 2022-09-25
  Issue No: Vol. 14 (2022)
Let's talk about stereochemistry for a moment: a home experiment conducted
with college students in social isolation.
- Authors: Tiago Lima da Silva
  Abstract: 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.
  PubDate: 2022-09-25
  Issue No: Vol. 14 (2022)
Determination of Nicotine in Cigarette Tobacco Smuggled to Brazil by
Modified QuEChERS Methodology
- Authors: CINTHIA ELOISE DOMINGUES, JANUÁRIO KORDIAK, CARLOS RAPHAEL PEDROSO, TATIANA ROSELENA OLIVEIRA SREMEL, Rosimara Zittel, Patrícia Los Weinert, CARLOS MAGNO SOUSA VIDAL, SANDRO XAVIER CAMPOS
  Abstract: 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-1 and 2.5 mg L-1, 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.
  PubDate: 2022-07-17
  Issue No: Vol. 14 (2022)