Acta Chemica Iasi最新文献

{"title":"L-TH NATIONAL SCIENTIFIC-METHODOLOGICAL SESSION “EDUCATIONAL METHODS AND MEANS FOR CHEMISTRY”, IASI, ROMANIA","authors":"Carmen Mita","doi":"10.47743/achi-2022-1-0004","DOIUrl":"https://doi.org/10.47743/achi-2022-1-0004","url":null,"abstract":"The researches in psychology made by F. F. Gayaraki, G. Lariccia, P. Gherardini, L. N. Landa, C. Bastien, etc. noted that there is a spontaneous tendency in both adults and children, to build an algorithmic structure when facing the necessity of solving problems. Investigations related to this method founded the “algorithmic pedagogy”. The authors appealed to experimental teaching methods to determine in what extend the algorithmization is a teaching method that increases accessibility of taught knowledge and if it lead to a more efficient teaching – learning – assessment process. For this purpose, during the 2014-2015 school year, the concepts contained in “Solutions – percentage concentration” and “Chemical formulas” learning units were taught differentiated: in the witness class (VII A) algorithmization was used and in the experimental class (VII B) the algorithmic method had been replaced with the explanation, conversation, exercise and problem solving, worksheets. Assessment of knowledge assimilated of the two classes’ students was performed by applying tests with similar content. The results were compared with the initial premise and average marks obtained in Physics in the previous school year. The paper also includes a study on the influence of external factors on the academic situation of students from VII th and VIII th grades. The results obtained from this study were statistical evaluated using the SPSS data analysis package. The interdisciplinary approach of knowledge in the integrated optional class belonging to the Mathematics and Science Curriculum Area relies on the fact that 8 th grade pupils are at the appropriate age when they are able to notice the multiple relationships existing between Chemistry, Physics, Mathematics and Biology. They can use the knowledge they have learnt in these subjects, as part of the common core curriculum in the optional course put forward by the teacher and chosen by parents and pupils – “The Human Body – A Living Laboratory”. The optional course mentioned above consists of knowledge pupils have already assimilated during courses which belong to Mathematics and Science curriculum area. They have had the possibility to express themselves relying on individual abilities so that information passes via the filter of their mind and soul. The final result has been a better understanding of the human body perceived in a unitary manner. as portfolio (consisting in handwriting or typed information), essays, projects and self- assessment. The centralization of information acquired after the assessment constitutes a starting point in building a thorough database which will reflect the learning progress and the factors which influence it. The teacher’s intervention will be performed adequately for each pupil taking into account his/her present and future needs. During my years of teaching I ascertained real difficulties from gymnasium and high-school pupils as far as understanding the fundamental concepts in ch","PeriodicalId":6958,"journal":{"name":"Acta Chemica Iasi","volume":"10 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89089027","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}

{"title":"REVIEW: ARSENIC CONTAMINATION IN THE WORLD AND THE SPECIFIC CASE OF ARSENIC POLLUTED AREA OF TARNIȚA, NORTHEASTERN ROMANIA","authors":"Z. C. Lagobo, V. Mambo, B. O. Yapo, V. P. Houenou, R. Necula, G. Drochioiu","doi":"10.47743/achi-2022-1-0001","DOIUrl":"https://doi.org/10.47743/achi-2022-1-0001","url":null,"abstract":"","PeriodicalId":6958,"journal":{"name":"Acta Chemica Iasi","volume":"54 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89109591","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}

{"title":"SYNTHESIS AND ANTIOXIDANT ACTIVITY OF SOME CHALCONES CONTAINING N-ARYLACETAMIDE GROUP","authors":"C. T. Nguyen, Na Pham-Thien Vo, Lien Nguyen, Khue To, Kiet Van Doan, H. Tran","doi":"10.47743/ACHI-2021-1-0001","DOIUrl":"https://doi.org/10.47743/ACHI-2021-1-0001","url":null,"abstract":"(E)-3-(4-chlorophenyl)-1-(4-hydroxyphenyl)prop-2-en-1-one (3a) or (E)-3-(4-methoxyphenyl)-1-(4-hydroxyphenyl)prop-2-en-1-one (3b) were prepared from reaction of 4-hydroxyacetophenone (1) and 4-chlorobenzaldehyde (2a) or 4-methoxybenzaldehyde (2b), respectively. The reaction of 3a or 3b and various N-aryl-2-chloroacetamides (4a-d) afforded eight new N-aryl-2-(4-(3-(4substituted phenyl)acryloyl)phenoxy)acetamide compounds (5a-h). The structures of the compounds were confirmed by IR, H-NMR, C-NMR and HR-MS spectral data. Antioxidant activity performed by DPPH radical scavenging method showed that N-aryl-2-(4-(3-(4-substituted phenyl)acryloyl)phenoxy)acetamide compounds (5a-h) at a concentration of 10.0 μg/ mL possess antioxidant activity in equivalent to that of ascorbic acid at a concentration of 6.0-8.0 μg/ mL while the antioxidant activity of 3a and 3b compounds is higher that of ascorbic acid at the same concentration.","PeriodicalId":6958,"journal":{"name":"Acta Chemica Iasi","volume":" 13","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72379866","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}

{"title":"PREPARATION AND CHARACTERIZATION OF ORGANOMONTMORILLONITE MODIFIED WITH ALKYLAMMONIUM CATION SURFACTANT: ADSORPTION EFFECT OF ZENONE","authors":"H. Mekhalfi, S. Boudjemaa","doi":"10.47743/ACHI-2021-1-0003","DOIUrl":"https://doi.org/10.47743/ACHI-2021-1-0003","url":null,"abstract":"Montmorillonite (MMT) has been subjected to modification through ion-exchange reaction by hexadecyltrimethylammonium chloride (CTAC) ([(C16H33)N(CH3)3]Cl). The organomodified montmorillonite (OMM) was characterized by FT-IR, XRD, ATG, SEM, EDX, and Nitrogen adsorption measurements (BET). The basal spacing of unmodified bentonite, determined by XRD was 13.54 Å and after modification it increased up to 19.74 Å. FTIR and TG/DTG results showed a good amount of organic compound in organomodified MMT. Results of the SEM study revealed a tendency towards lump formation and agglomeration of the organomodified clay particles of montmorillonite. The adsorption of Zenone (ZE), a mycotoxin from animal food, onto MMT and OMMT was investigated. Effects of alkylammonium Cation Surfactant in binding ZE were studied. The intercalation of MMT with CTAC, the OMMT exhibited the highest adsorption rate of ZE (94.1%) which was much higher than that of MMT (11.21%). The adsorption isotherm parameters were calculated by using the Langmuir and Freundlich models and the data fitted better to the first one. All results indicate that OMMT has great potential to be a high-performance material to control ZE contamination. Hamoudi Mekhalfi, e-mail: bsouf77@yahoo.fr 32 Hamoudi Mekhalfi and Soufiane Boudjemaa","PeriodicalId":6958,"journal":{"name":"Acta Chemica Iasi","volume":"140 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80144319","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}

{"title":"PURELY CLEAR KINETIC SPECTROPHOTOMETRIC PROCESS FOR BROMHEXINE HYDROCHLORIDE EVALUATION IN PHARMACEUTICAL PREPARATIONS","authors":"M. Al-Rufaie","doi":"10.47743/achi-2021-2-0009","DOIUrl":"https://doi.org/10.47743/achi-2021-2-0009","url":null,"abstract":"For the evaluation of Bromhexine hydrochloride (BRO) in pure drugs as well as their pharmaceutical preparations, a successful, sensitivity spectrophotometric method has been proved as well as checked. The methodology is focused on the creation of the Schiff base by pdimethylaminobenzaldehyde (PDMB), giving a bright yellow color to the reaction of the drug with the reagent . The yellow colored absorbance of species was assessed at its maximum absorption λmax of 420 nm. The Beer’s law was obeyed in the 10-60 μg/ml as the concentration range. The optical values were measured to be 8.693 x10 (L/mol/cm), 0.0005 (μg/cm2), Molar absorption coefficient as well as Sandell sensitivity respectively. The LOD and the LOQ for the suggested methodology were measured 3.280μg/ml, 4.114 μg/ml, respectively. To maximize the reaction conditions, all the variables were studied. The interference for the suggested method was identified in the existence of traditional excipients of pharmaceutics. By testing BRO in its pharmaceutical formulations, the validity of the approach was checked and objectively tested by statistical tests for its accuracy. Strong recoveries were obtained by the method developed; the results obtained in its pharmaceutical dosage forms were critically evaluated and used effectively for determining BRO.","PeriodicalId":6958,"journal":{"name":"Acta Chemica Iasi","volume":"328 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77197943","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}

{"title":"SIMULTANEOUS VOLTAMMETRIC DETERMINATION OF PARACETAMOL AND ASCORBIC ACID USING ACTIVATED GLASSY CARBON ELECTRODE: CYCLIC VOLTAMMETRY AND SQUARE WAVE VOLTAMMETRY STUDY","authors":"Yared Shewarega, Dereje Yenealem, Fikadu Siyum","doi":"10.47743/achi-2021-2-0008","DOIUrl":"https://doi.org/10.47743/achi-2021-2-0008","url":null,"abstract":": Simultaneous voltammetric determination of paracetamol (PA) and ascorbic acid (AA) at activated glassy carbon electrode (aGCE) using cyclic voltammetry (CV) and square wave voltammetry (SWV) was studied. The electrochemical responses of PA and AA were compared at bare (bGCE) and aGCE. The aGCE displayed excellent electrochemical catalytic activities and decreased the over-potential for simultaneous determination of PA and AA. It was found that the redox process at aGCE for both PA and AA is adsorption-controlled process. The linear range, limit of quantification (LOQ) and detection limit (LOD) of PA were found to be 10 to 100 µM; 0.517 µM and 0.155 µM, respectively. Similarly, the linear range, LOQ and LOD of AA were found to be 0.4 to 0.95 mM, 6.32 µM and 1.89 µM, respectively. The validity of the proposed method was checked by using commercial drug which contain different amount of PA and AA and satisfactory percent recoveries were obtained.","PeriodicalId":6958,"journal":{"name":"Acta Chemica Iasi","volume":"45 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82080619","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}

{"title":"OCCURRENCE OF SELECTED ANTHROPOGENIC ORGANIC CONTAMINANTS IN DRINKING WATER FROM RURAL AREAS OF EASTERN ROMANIA","authors":"D. Dirtu, Manuela Pancu, Luminita Minea","doi":"10.47743/achi-2021-2-0012","DOIUrl":"https://doi.org/10.47743/achi-2021-2-0012","url":null,"abstract":"The purpose of this study was to evaluate the trend of organochlorine pesticides (OCPs), trihalomethanes (THMs) and polycyclic aromatic hydrocarbons (PAHs) levels in drinking water sampled from rural areas located in Eastern Romania. After chemical analyses and data processing, 86% of the collected samples were found to be compliant with the Romanian and EU regulations. The set limits for measured contaminants in accordance with the Directive 98/83/EC were exceeded in the cases of THMs and benzo(a)pyrene. A diagnostic ratio method was applied in order to determine possible PAH sources in collected samples (petrogenic or pyrolitic). Our results evidenced a high percentage contribution of low molecular weight PAHs (96%) combined with high ratio for low/high molecular weight (31.4) suggesting that the contamination of the drinking water can be attributed to petrogenic pollution of the water sources rather than due its’ storage and transport.","PeriodicalId":6958,"journal":{"name":"Acta Chemica Iasi","volume":"30 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91093331","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}

{"title":"A NEW SPECTROSCOPY METHOD FOR THE QUANTITATIVE DETERMINATION OF IRON(III) BASED ON CURCUMIN REAGENT","authors":"Q. Tran, Dinh-Vu Le","doi":"10.47743/ACHI-2021-1-0004","DOIUrl":"https://doi.org/10.47743/ACHI-2021-1-0004","url":null,"abstract":"The paper describes a simple, sensitive, and selective spectroscopy method for the determination of Fe by curcumin reagent and iron(III). In acid media, a 1:2 complex was formed; its properties were identified by UV-VIS, FTIR, Raman, and MS spectra. The maximum absorbance of UV-Vis spectra appeared at 518 nm. The parameters of the method for the determination of Fe was validated. Beer’s law was obeyed in the range 0.2×10 M to 2.0×10mol/L of Fe. The limited of detection (LOD) and limited of quantitation (LOQ) has been to be 0.5.0×10 6 and 1.5×10 mol/L. This method was applied to determine the concentration of ferrous total in various samples.","PeriodicalId":6958,"journal":{"name":"Acta Chemica Iasi","volume":"1 1","pages":"45-64"},"PeriodicalIF":0.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88660637","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}

{"title":"EVALUATION OF THE HAEMOSTATIC POTENTIALS OF CRUDE METHANOLIC LEAF EXTRACT OF PERSEA AMERICANA IN WISTAR RATS","authors":"G. C. Anigbo, O. Onyekwere, P. I. Akwukwaegbu, A. Lackson, C. Bando, Obinna Okoye, Azubuike Bright Okoroafor, Patrick Esemaya, C. Patrick","doi":"10.47743/ACHI-2021-1-0006","DOIUrl":"https://doi.org/10.47743/ACHI-2021-1-0006","url":null,"abstract":"To date, there is limited information on the coagulative and possible haemostatic potentials of Persea americana extract. In light of this, the study was aimed to investigate the haemostatic potentials of crude methanolic leaf extract of Persea americana in Wistar rats using standard analytical methods. A total of twenty-five adult male Wistar rats were arbitrarily distributed into five groups of five rats each and kept under suitable conditions for acclimatization and feeding. Group A was used as control and received feed and water only while various plant extracts (with concentrations 200, 400, 600 and 800 mg/kg) were orally administered on daily basis per body weight of animal in addition to normal feed and water for thirty days to the test groups B-E. After 4 weeks, the animals were sacrificed painlessly and blood samples were collected by retro-orbital plexus of Onyekachi A. Onyekwere, e-mail: onyekachi.onyekwere.au@gmail.com 82 George C. Anigbo et al. the median canthus of the eyes. The prothrombin and activated partial thromboplastin times (PT and APTT), clotting and bleeding times (CT and BT) and plasma fibrinogen concentration were determined. Phytochemical screening of the leaf extract revealed substantial percentage of alkaloids, saponins, tannins, flavonoids, steroids and phenols. Results of the haemostatic potential showed a dose-dependent significant decrease (P<0.05) in the PT, APTT, CT, and BT and a slightly increase (P<0.05) in the plasma fibrinogen concentration when compared with the control. This study suggested that the leaf extract of Persea Americana had a stimulatory effect on intrinsic and extrinsic properties of the coagulation cascade.","PeriodicalId":6958,"journal":{"name":"Acta Chemica Iasi","volume":"15 1","pages":"81-96"},"PeriodicalIF":0.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87170835","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}

{"title":"INVESTIGATION ON MAGNETIC PROPERTIES AND CURIE TEMPERATURE OF SAMARIUM MODIFIED COBALT FERRITE","authors":"Sita Rama Raju Padam, M. Dasari","doi":"10.47743/achi-2021-2-0010","DOIUrl":"https://doi.org/10.47743/achi-2021-2-0010","url":null,"abstract":"Samarium substituted cobalt ferrite CoFe2-xSmxO4 with concentration of x = 0, 0.05 and 0.15 were prepared using conventional solid-state ceramic method. Prepared samples first calcined at 900C for 4 hours and then sintered at 1150 C for 4 hours. The X-Ray powder diffraction data analysed to identify the phases present in the crystalline ceramic. An additional phase of Sm-Fe-O was observed for the sample at x = 0.15. Lattice parameter, strain and saturation magnetization found to be decreasing whereas crystallite size and coercivity found to be vary with samarium content. Decrease of Curie temperature attributed to the decrease of exchange interaction among tetrahedral or octahedral ions due to samarium content.","PeriodicalId":6958,"journal":{"name":"Acta Chemica Iasi","volume":"2 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80308003","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}