Pub Date : 2023-07-01DOI: 10.26850/1678-4618eqj.v48.3.2023.p54-80
A. Oyebamiji, J. Babalola, K. Odelade, S. Akintelu, Olubunmi Ayoola Nubi, H. Aworinde, E. Faboro, E. Akintayo, B. Semire
Schistosomiasis remains one of the severe ailments that affect both man and woman in South Africa. It is caused by blood fluke, and the rate at which it causes death is alarming in some areas of America, Asia as well as in African countries. It is a neglected tropical disease (NTD) with grave impact on social and economic situation of countries with low sanitation awareness. Thus, the search for lasting solution to this menace, has drawn the attention of many global researchers using phytochemicals from Scilla natalensis via in silico approach. The studied compounds were optimized using Spartan 14. Docking study was executed via Pymol, Autodock tool, Auto dock vina and discovery studio. Compound 9 with –8.2 kcal mol–1 and –9.4 kcal mol–1 as binding affinity proved to possess highest ability to inhibit glutathione S-transferase and thioredoxin-glutathione reductase than other compounds. Also, ADMET properties for compound 9 and praziquantel were explored and reported. Our findings may open the door for the design of novel drug-like molecules with better efficiency.
{"title":"Potential inhibiting activities of phytochemicals in Scilla natalensis bulbs against schistosomiasis","authors":"A. Oyebamiji, J. Babalola, K. Odelade, S. Akintelu, Olubunmi Ayoola Nubi, H. Aworinde, E. Faboro, E. Akintayo, B. Semire","doi":"10.26850/1678-4618eqj.v48.3.2023.p54-80","DOIUrl":"https://doi.org/10.26850/1678-4618eqj.v48.3.2023.p54-80","url":null,"abstract":"Schistosomiasis remains one of the severe ailments that affect both man and woman in South Africa. It is caused by blood fluke, and the rate at which it causes death is alarming in some areas of America, Asia as well as in African countries. It is a neglected tropical disease (NTD) with grave impact on social and economic situation of countries with low sanitation awareness. Thus, the search for lasting solution to this menace, has drawn the attention of many global researchers using phytochemicals from Scilla natalensis via in silico approach. The studied compounds were optimized using Spartan 14. Docking study was executed via Pymol, Autodock tool, Auto dock vina and discovery studio. Compound 9 with –8.2 kcal mol–1 and –9.4 kcal mol–1 as binding affinity proved to possess highest ability to inhibit glutathione S-transferase and thioredoxin-glutathione reductase than other compounds. Also, ADMET properties for compound 9 and praziquantel were explored and reported. Our findings may open the door for the design of novel drug-like molecules with better efficiency.","PeriodicalId":35894,"journal":{"name":"Ecletica Quimica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76142218","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}
Pub Date : 2023-07-01DOI: 10.26850/1678-4618eqj.v48.3.2023.p27-35
Habiddin Habiddin, Cyndi Yanis Saputri, Aman Santoso
The effect of the Cooperative Integrated Reading and Composition (CIRC) approach on scientific literacy and students’ regulated learning in colligative properties of solution was explored. The contribution of the CIRC approach was measured by investigating whether the improvement in scientific literacy and regulated learning of the CIRC students are more significant than the improvement for students with the Direct Instructional Teaching Method (DITM) after experiencing two different teaching approaches. Two groups of students (experiment and comparison) from a public senior high school in East Java, Indonesia, were involved. The experimental group experienced the colligative properties of solution with the CIRC teaching approach, while the comparison group experienced the DITM one. We found that scientific literacy and self-regulated learning of students with CIRC are higher than students with DITM, implying the potency of this approach to be applied to other chemistry topics. This study indicates that CIRC could be used to improve students’ scientific literacy and self-regulated learning for other chemistry topics. The implication of this study for teaching colligative properties of solution is also discussed.
{"title":"The potency of cooperative integrated reading and composition in building chemistry students’ scientific literacy and self-regulated learning","authors":"Habiddin Habiddin, Cyndi Yanis Saputri, Aman Santoso","doi":"10.26850/1678-4618eqj.v48.3.2023.p27-35","DOIUrl":"https://doi.org/10.26850/1678-4618eqj.v48.3.2023.p27-35","url":null,"abstract":"The effect of the Cooperative Integrated Reading and Composition (CIRC) approach on scientific literacy and students’ regulated learning in colligative properties of solution was explored. The contribution of the CIRC approach was measured by investigating whether the improvement in scientific literacy and regulated learning of the CIRC students are more significant than the improvement for students with the Direct Instructional Teaching Method (DITM) after experiencing two different teaching approaches. Two groups of students (experiment and comparison) from a public senior high school in East Java, Indonesia, were involved. The experimental group experienced the colligative properties of solution with the CIRC teaching approach, while the comparison group experienced the DITM one. We found that scientific literacy and self-regulated learning of students with CIRC are higher than students with DITM, implying the potency of this approach to be applied to other chemistry topics. This study indicates that CIRC could be used to improve students’ scientific literacy and self-regulated learning for other chemistry topics. The implication of this study for teaching colligative properties of solution is also discussed.","PeriodicalId":35894,"journal":{"name":"Ecletica Quimica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78256093","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}
Pub Date : 2023-07-01DOI: 10.26850/1678-4618eqj.v48.3.2023.p36-53
Y. Jamil, F. Al-Azab, N. Al-Selwi
Six complexes have been synthesized from Cu(II), Ni(II), and Co(II) with new bidentate N2 donor Schiff base ligand (2-methoxybenzalidene-1-phenylsemicarbazide L1) and tridentate N2O donor organophosphorus Schiff base ligand (2-methoxybenzalidenediphenylphosphate-1-phenylsemicarbazide L2). Both ligands were synthesized and characterized by metal analysis, infrared (IR), ultraviolet visible (UV-Vis), and nuclear magnetic resonance (NMR) spectral studies. The chemical structures of the synthesized complexes were characterized using their metal analysis, magnetic susceptibility, molar conductance, IR, and UV-Vis spectra. According to molar ratio studies, the complexes have the composition of ML2 for L1 and ML for L2. The X-ray diffraction (XRD) studies showed that the particle size of ligands and L1 complexes were in nano-range. The ligands and their metal complexes have been screened for their antioxidant, antibacterial and antifungal activity.
{"title":"Novel organophosphorus Schiff base ligands: Synthesis, characterization, ligational aspects, XRD and biological activity studies","authors":"Y. Jamil, F. Al-Azab, N. Al-Selwi","doi":"10.26850/1678-4618eqj.v48.3.2023.p36-53","DOIUrl":"https://doi.org/10.26850/1678-4618eqj.v48.3.2023.p36-53","url":null,"abstract":"Six complexes have been synthesized from Cu(II), Ni(II), and Co(II) with new bidentate N2 donor Schiff base ligand (2-methoxybenzalidene-1-phenylsemicarbazide L1) and tridentate N2O donor organophosphorus Schiff base ligand (2-methoxybenzalidenediphenylphosphate-1-phenylsemicarbazide L2). Both ligands were synthesized and characterized by metal analysis, infrared (IR), ultraviolet visible (UV-Vis), and nuclear magnetic resonance (NMR) spectral studies. The chemical structures of the synthesized complexes were characterized using their metal analysis, magnetic susceptibility, molar conductance, IR, and UV-Vis spectra. According to molar ratio studies, the complexes have the composition of ML2 for L1 and ML for L2. The X-ray diffraction (XRD) studies showed that the particle size of ligands and L1 complexes were in nano-range. The ligands and their metal complexes have been screened for their antioxidant, antibacterial and antifungal activity.","PeriodicalId":35894,"journal":{"name":"Ecletica Quimica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91277038","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}
Pub Date : 2023-07-01DOI: 10.26850/1678-4618eqj.v48.3.2023.p81-90
M. Fonseca, M. Kobelnik, G. G. Fontanari, M. Crespi, C. A. Ribeiro
Carica papaya L. is frequently found in northern and northeastern Brazil, the Caribbean and Central America. The papaya seed oil was extracted using Soxhlet extraction. Its oil has low acidity, iodine index, saponification and peroxide values adequate and comparable to other commercially available vegetable oils. The lipid profile of this oil was also obtained by gas chromatography; thermal characterization was performed by thermogravimetry (TG) and differential scanning calorimetry (DSC) under various heating rates. The composition of the in-nature oil indicates that oleic and palmitic fatty acids are predominant. The DSC analysis under cooling shows that the crystallization phase of this oil is similar to olive oil, and the thermogravimetric results show the thermal decomposition under nitrogen purge gas occurs in only one stage. The activation energy was obtained applying the isoconversional methods proposed by Capela and Ribeiro, Ozawa and Friedman. The obtained kinetics data leads to a dependence on the sample mass and purge gases, which results in several kinetic patterns.
{"title":"Oil extraction from seeds of Carica papaya L.: Obtaining the lipid profile and thermal evaluation","authors":"M. Fonseca, M. Kobelnik, G. G. Fontanari, M. Crespi, C. A. Ribeiro","doi":"10.26850/1678-4618eqj.v48.3.2023.p81-90","DOIUrl":"https://doi.org/10.26850/1678-4618eqj.v48.3.2023.p81-90","url":null,"abstract":"Carica papaya L. is frequently found in northern and northeastern Brazil, the Caribbean and Central America. The papaya seed oil was extracted using Soxhlet extraction. Its oil has low acidity, iodine index, saponification and peroxide values adequate and comparable to other commercially available vegetable oils. The lipid profile of this oil was also obtained by gas chromatography; thermal characterization was performed by thermogravimetry (TG) and differential scanning calorimetry (DSC) under various heating rates. The composition of the in-nature oil indicates that oleic and palmitic fatty acids are predominant. The DSC analysis under cooling shows that the crystallization phase of this oil is similar to olive oil, and the thermogravimetric results show the thermal decomposition under nitrogen purge gas occurs in only one stage. The activation energy was obtained applying the isoconversional methods proposed by Capela and Ribeiro, Ozawa and Friedman. The obtained kinetics data leads to a dependence on the sample mass and purge gases, which results in several kinetic patterns.","PeriodicalId":35894,"journal":{"name":"Ecletica Quimica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89620419","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}
Pub Date : 2023-07-01DOI: 10.26850/1678-4618eqj.v48.3.2023.p17-26
I. Albrecht, Natalia Coelho Da Silva, F. A. Carvalho, F. Oda, A. D. dos Santos
Phyllanthus niruri L. has been used in folk medicine to treat hepatitis, diabetes, urinary tract disorders, and renal calculi. Here, the chemical differences among its organs and the seasonal chemical variability in the aerial parts were evaluated. The chromatographic profile and gallic acid, corilagin, and ellagic acid contents were determined by ultrahigh performance liquid chromatography with photodiode array ultraviolet (UHPLC-PDA/UV) method, which showed adequate resolution and a short analysis time. The contents of gallic acid, corilagin and ellagic acid in the leaf extract were 2.8, 6.7 and 7.9%, respectively, whilst their contents in the stem and root extracts were lower (< 0.2%). Thus, using the whole plant or aerial parts for herbal medicines can produce different biological responses. The chemical profile of the aerial parts showed only quantitative variation over 12 months. The seasonal content of gallic acid showed no correlation with monthly rainfall, but the contents of corilagin and ellagic acid were positively correlated with rainfall.
{"title":"Chemical variability of phenolic compounds in Phyllanthus niruri","authors":"I. Albrecht, Natalia Coelho Da Silva, F. A. Carvalho, F. Oda, A. D. dos Santos","doi":"10.26850/1678-4618eqj.v48.3.2023.p17-26","DOIUrl":"https://doi.org/10.26850/1678-4618eqj.v48.3.2023.p17-26","url":null,"abstract":"Phyllanthus niruri L. has been used in folk medicine to treat hepatitis, diabetes, urinary tract disorders, and renal calculi. Here, the chemical differences among its organs and the seasonal chemical variability in the aerial parts were evaluated. The chromatographic profile and gallic acid, corilagin, and ellagic acid contents were determined by ultrahigh performance liquid chromatography with photodiode array ultraviolet (UHPLC-PDA/UV) method, which showed adequate resolution and a short analysis time. The contents of gallic acid, corilagin and ellagic acid in the leaf extract were 2.8, 6.7 and 7.9%, respectively, whilst their contents in the stem and root extracts were lower (< 0.2%). Thus, using the whole plant or aerial parts for herbal medicines can produce different biological responses. The chemical profile of the aerial parts showed only quantitative variation over 12 months. The seasonal content of gallic acid showed no correlation with monthly rainfall, but the contents of corilagin and ellagic acid were positively correlated with rainfall.","PeriodicalId":35894,"journal":{"name":"Ecletica Quimica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80271124","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}
Pub Date : 2023-04-01DOI: 10.26850/1678-4618eqj.v48.2.2023.p49-65
A. Fathi, Yassir Shakeeb Al Jawaheri, Shaimaa Samir Ismaee
In this paper, some substituted imines compounds have been prepared from quinolinic acid as a starting material. Firstly, the quinolinic acid was treated with acetic anhydride and acetic acid to form furo[3,4-b]pyridine-5,7-dione (1); the resulting compound was heated with urea to form 5H-pyrrolo[3,4-b]pyridine-5,7(6H)-dione (2). After that, it was treated with potassium hydroxide to give potassium 5,7-dioxo-5,7-dihydropyrrolo[3,4-b]pyridin-6-dione, which was directly and easily converted to 6-(2-([1,1'-biphenyl]-4-yl)-2-oxoethyl)-5H-pyrrolo[3,4-b]pyridine-5,7(6H)-dione (3) by the reaction with 1-([1,1'-biphenyl]-4-yl)-2-bromoethan-1-one. Finally, the resultant compound reacted with substituted aniline to give imines (4, 5). Secondly the quinolinic acid converted to 4-(5,7-dioxo-5,7-dihydro-6H-pyrrolo[3,4-b] pyridin-6-yl) benzenesulfonyl chloride according to our previous work, then treated with p-hydroxy acetophenone or p-hydroxy benzaldehyde to form 4-substituted bezyloxy 4-(5,7-dioxo-5,7-dihydro-6H-pyrrolo[3,4-b] pyridine-6-yl) benzenesulfonate (6, 7), which were finally treated with substituted aniline to form new substituted imines (8–12).
{"title":"Synthesis of some new substituted imines from aldehydes and ketones derived from quinolinic acid","authors":"A. Fathi, Yassir Shakeeb Al Jawaheri, Shaimaa Samir Ismaee","doi":"10.26850/1678-4618eqj.v48.2.2023.p49-65","DOIUrl":"https://doi.org/10.26850/1678-4618eqj.v48.2.2023.p49-65","url":null,"abstract":"In this paper, some substituted imines compounds have been prepared from quinolinic acid as a starting material. Firstly, the quinolinic acid was treated with acetic anhydride and acetic acid to form furo[3,4-b]pyridine-5,7-dione (1); the resulting compound was heated with urea to form 5H-pyrrolo[3,4-b]pyridine-5,7(6H)-dione (2). After that, it was treated with potassium hydroxide to give potassium 5,7-dioxo-5,7-dihydropyrrolo[3,4-b]pyridin-6-dione, which was directly and easily converted to 6-(2-([1,1'-biphenyl]-4-yl)-2-oxoethyl)-5H-pyrrolo[3,4-b]pyridine-5,7(6H)-dione (3) by the reaction with 1-([1,1'-biphenyl]-4-yl)-2-bromoethan-1-one. Finally, the resultant compound reacted with substituted aniline to give imines (4, 5). Secondly the quinolinic acid converted to 4-(5,7-dioxo-5,7-dihydro-6H-pyrrolo[3,4-b] pyridin-6-yl) benzenesulfonyl chloride according to our previous work, then treated with p-hydroxy acetophenone or p-hydroxy benzaldehyde to form 4-substituted bezyloxy 4-(5,7-dioxo-5,7-dihydro-6H-pyrrolo[3,4-b] pyridine-6-yl) benzenesulfonate (6, 7), which were finally treated with substituted aniline to form new substituted imines (8–12).","PeriodicalId":35894,"journal":{"name":"Ecletica Quimica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75479227","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}
Pub Date : 2023-04-01DOI: 10.26850/1678-4618eqj.v48.2.2023.p17-21
H. Widarti, T. Sriwahyuni, Deni Ainur Rokhim, Afis Baghiz Syafrudin
Social media-based learning can involve students in open, competitive, and running learning according to the speed of each understanding. This study aims to examine empirical articles about social media increasing the motivation to study chemistry for high school and undergraduate students using the Systematic Literature Review method, namely, to identify, analyze, and interpret findings on research topics published from 2018 to 2022. Five articles were identified through the publish or perish search engine using Scopus databases. The articles studied reviewed the effect of using social media in learning. The results of the study focused on the use of social media in chemistry learning which can increase student motivation for both high school and undergraduate students.
{"title":"Social media-based learning in Chemistry learning: A review","authors":"H. Widarti, T. Sriwahyuni, Deni Ainur Rokhim, Afis Baghiz Syafrudin","doi":"10.26850/1678-4618eqj.v48.2.2023.p17-21","DOIUrl":"https://doi.org/10.26850/1678-4618eqj.v48.2.2023.p17-21","url":null,"abstract":"Social media-based learning can involve students in open, competitive, and running learning according to the speed of each understanding. This study aims to examine empirical articles about social media increasing the motivation to study chemistry for high school and undergraduate students using the Systematic Literature Review method, namely, to identify, analyze, and interpret findings on research topics published from 2018 to 2022. Five articles were identified through the publish or perish search engine using Scopus databases. The articles studied reviewed the effect of using social media in learning. The results of the study focused on the use of social media in chemistry learning which can increase student motivation for both high school and undergraduate students.","PeriodicalId":35894,"journal":{"name":"Ecletica Quimica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83412244","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}
Pub Date : 2023-04-01DOI: 10.26850/1678-4618eqj.v48.2.2023.p66-82
F. Al-Azab, Y. Jamil, A. A. Al-Gaadbi
The current study was purposed to prepare Co(II), Ni(II) and Cu(II) complexes with the ligands derived from 2-chlorobenzaldehyde, glycine and hydrazine hydrate. The obtained compounds were characterized by different physicochemical studies such as elemental analysis, atomic absorption, molar ratio analysis, electronic absorption (UV-Vis spectroscopy), magnetic properties, FTIR spectroscopy, 1H�NMR, 13C-NMR, conductance measurements and XRD. Antimicrobial and antioxidant activities were also calculated. The antibacterial activity was evaluated by the diffusion method against two Gram-positive and two Gram-negative bacteria, while antifungal activity was assessed against two fungal strains by using the agar method. The ligand with Schiff base and hydrazide groups and its complexes showed better biological activity. The results showed that the most metal complexes have much higher antibacterial and antifungal activity compared to the parent ligand. The antioxidant activity of 3.7453 mg of the ligand exhibited excellent activity as the activity of 1 mg of ascorbic acid which is used as a standard antioxidant.
{"title":"Synthesis, structural and spectroscopic properties of Co(II), Ni(II) and Cu(II) complexes with 2-((2-chlorobenzylidene)amino) acetohydrazide hydrate and their Antimicrobial and antioxidant activities","authors":"F. Al-Azab, Y. Jamil, A. A. Al-Gaadbi","doi":"10.26850/1678-4618eqj.v48.2.2023.p66-82","DOIUrl":"https://doi.org/10.26850/1678-4618eqj.v48.2.2023.p66-82","url":null,"abstract":"The current study was purposed to prepare Co(II), Ni(II) and Cu(II) complexes with the ligands derived from 2-chlorobenzaldehyde, glycine and hydrazine hydrate. The obtained compounds were characterized by different physicochemical studies such as elemental analysis, atomic absorption, molar ratio analysis, electronic absorption (UV-Vis spectroscopy), magnetic properties, FTIR spectroscopy, 1H�NMR, 13C-NMR, conductance measurements and XRD. Antimicrobial and antioxidant activities were also calculated. The antibacterial activity was evaluated by the diffusion method against two Gram-positive and two Gram-negative bacteria, while antifungal activity was assessed against two fungal strains by using the agar method. The ligand with Schiff base and hydrazide groups and its complexes showed better biological activity. The results showed that the most metal complexes have much higher antibacterial and antifungal activity compared to the parent ligand. The antioxidant activity of 3.7453 mg of the ligand exhibited excellent activity as the activity of 1 mg of ascorbic acid which is used as a standard antioxidant.","PeriodicalId":35894,"journal":{"name":"Ecletica Quimica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80216160","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}
Pub Date : 2023-04-01DOI: 10.26850/1678-4618eqj.v48.2.2023.p35-48
This work reports a new application for a well-known medicinal plant used in Brazil. The green synthesis of silver nanoparticles (AgNPs) using the aqueous extract of Monteverdia ilicifolia (MI) leaves as stabilizing and reducing agent is described. The AgNPs-MI obtained were characterized by UV-VIS, FTIR, and Raman spectroscopies, DLS, zeta potential and FEG-SEM, which demonstrated that M. ilicifolia was effective at capping the AgNPs, yielding stable suspensions. These nanoparticles were deposited on glassy carbon electrodes, and they were efficiently applied as electrochemical sensors for the determination of dopamine (DA) using square wave voltammetry (SWV). The AgNPs-MI improved the electrochemical properties of the electrodes and enhanced their electroanalytical performance. The developed sensing device presented detection and quantification limits equal to 0.52 and 1.74 ?mol�L�1, respectively, towards DA determination. The proposed electrochemical sensor quantified this neurotransmitter successfully, confirming its potential as a new promising analytical detection tool for DA quality control.
本文报道了一种在巴西使用的著名药用植物的新应用。本文描述了以蒙特韦达叶(MI)水提物为稳定还原剂绿色合成纳米银颗粒(AgNPs)。通过紫外可见光谱(UV-VIS)、红外光谱(FTIR)、拉曼光谱(Raman)、DLS、zeta电位(zeta potential)和扫描电镜(fg - sem)对所得AgNPs- mi进行了表征，结果表明，M. ilicifolia能够有效封盖AgNPs，产生稳定的悬浮液。这些纳米粒子被沉积在玻碳电极上，并被有效地应用于方波伏安法(SWV)测定多巴胺(DA)的电化学传感器。AgNPs-MI改善了电极的电化学性能，提高了电极的电分析性能。该传感装置对DA的检测限和定量限分别为0.52 mol L L 1和1.74 mol L L 1。所提出的电化学传感器成功地定量了这种神经递质，证实了它作为一种新的有前途的DA质量控制分析检测工具的潜力。
{"title":"Detection of dopamine using glassy carbon electrodes modified with AgNPs synthetized with Monteverdia ilicifolia extract","authors":"","doi":"10.26850/1678-4618eqj.v48.2.2023.p35-48","DOIUrl":"https://doi.org/10.26850/1678-4618eqj.v48.2.2023.p35-48","url":null,"abstract":"This work reports a new application for a well-known medicinal plant used in Brazil. The green synthesis of silver nanoparticles (AgNPs) using the aqueous extract of Monteverdia ilicifolia (MI) leaves as stabilizing and reducing agent is described. The AgNPs-MI obtained were characterized by UV-VIS, FTIR, and Raman spectroscopies, DLS, zeta potential and FEG-SEM, which demonstrated that M. ilicifolia was effective at capping the AgNPs, yielding stable suspensions. These nanoparticles were deposited on glassy carbon electrodes, and they were efficiently applied as electrochemical sensors for the determination of dopamine (DA) using square wave voltammetry (SWV). The AgNPs-MI improved the electrochemical properties of the electrodes and enhanced their electroanalytical performance. The developed sensing device presented detection and quantification limits equal to 0.52 and 1.74 ?mol�L�1, respectively, towards DA determination. The proposed electrochemical sensor quantified this neurotransmitter successfully, confirming its potential as a new promising analytical detection tool for DA quality control.","PeriodicalId":35894,"journal":{"name":"Ecletica Quimica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89956841","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}
Pub Date : 2023-04-01DOI: 10.26850/1678-4618eqj.v48.2.2023.p22-34
Pedro Vinicius Costa Medeiros, Paulo Henrique Medeiros Theophilo, G. S. Lopes, L. P. Ribeiro
The use of biological agents for the large-scale production of biofuels has stood out as successful processes for the advancement of science in the world. The growing exploitation of biomass in the agricultural sector and the emergence of new energy sources generated from food industry waste have become attractive and viable due to the potential and variety of possibilities for using different sources of biomass. The present review was carried out through careful bibliographical research in the literature and in scientific journals for the current discussion of concepts, production methodologies and challenges for the energy sector considering second-generation ethanol (2G ethanol). Several 2G ethanol production methodologies have been implemented as a potential low-cost alternative energy production that follows the principles of Green Chemistry.
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