Maryam ABDULGHAFOR AHMED, Safana AHMED FARHAN, Rasha MONİEM DADOOSH, Abdulkadir MOHAMMED NOORİ JASSİM
Gold nanoparticles (AuNPs) are widely studied materials that have intense applications in various fields. Different methods use to synthesize the AuNPs, one of them is eco-friendly biological method, known as "green synthesis" a simple and inexpensive method. The Synthesis of AuNPs, using ginger extract is described here. The components found in ginger work as a stabilizing and reducing agent. Hydrogen tetrachloroaurate (HAuCl4) are mixed with the ginger extract to produce AuNPs. The Surface Plasmon Resonance (SPR) measured at λmax = 540 nm. UV-Vis, FTIR and Zeta potential are used to identify AuNPs, as well as AFM and SEM. Data indicate that AuNPs has a spherical structure. The results demonstrate that AuNPs stabilized by ascorbic acid were used as a colorimetric probe for Hg2+ ions, based on the production of (Au-Hg) amalgamate which made changes in their absorbance, due to its ability to reduce Hg2+ to Hg0, to enhance amalgamation. Practically, this procedure has successfully worked to detect Hg2+ in tap water as a sensitive and selective probe with upper limit of detection equal to 120 µM as well as the limit of detection (LOD) equal to 0.65 µM, so the method proved to be sensitive and selective probe.
{"title":"Biosynthetic Gold Nanoparticles as Sensitive and Selective Colorimetric Method for Mercury Ions","authors":"Maryam ABDULGHAFOR AHMED, Safana AHMED FARHAN, Rasha MONİEM DADOOSH, Abdulkadir MOHAMMED NOORİ JASSİM","doi":"10.18596/jotcsa.1300270","DOIUrl":"https://doi.org/10.18596/jotcsa.1300270","url":null,"abstract":"Gold nanoparticles (AuNPs) are widely studied materials that have intense applications in various fields. Different methods use to synthesize the AuNPs, one of them is eco-friendly biological method, known as \"green synthesis\" a simple and inexpensive method. The Synthesis of AuNPs, using ginger extract is described here. The components found in ginger work as a stabilizing and reducing agent. Hydrogen tetrachloroaurate (HAuCl4) are mixed with the ginger extract to produce AuNPs. The Surface Plasmon Resonance (SPR) measured at λmax = 540 nm. UV-Vis, FTIR and Zeta potential are used to identify AuNPs, as well as AFM and SEM. Data indicate that AuNPs has a spherical structure. The results demonstrate that AuNPs stabilized by ascorbic acid were used as a colorimetric probe for Hg2+ ions, based on the production of (Au-Hg) amalgamate which made changes in their absorbance, due to its ability to reduce Hg2+ to Hg0, to enhance amalgamation. Practically, this procedure has successfully worked to detect Hg2+ in tap water as a sensitive and selective probe with upper limit of detection equal to 120 µM as well as the limit of detection (LOD) equal to 0.65 µM, so the method proved to be sensitive and selective probe.","PeriodicalId":17299,"journal":{"name":"Journal of the Turkish Chemical Society Section A: Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89386340","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}
In this study, dissolved styrene butadiene styrene (SBS) copolymer is homogeneously reinforced into orthophthalic unsaturated polyester (UP) resin. Polyester composite production is carried out with the help of methyl ethyl ketone peroxide (MEKP) and cobalt octoate (Co Oc) catalysts. The density, Shore D hardness, thermal conductivity coefficient, thermal stability, morphological surface structure, and chemical bond structure of the obtained composite have been examined. According to the results, SBS reinforcement decreases the density of the composite and increases the thermal conductivity coefficient. The addition of SBS at different weight ratios (1%, 3%, 5%, 7%, and 10% w/w) reduces both the hardness and thermal stability of the polyester composite. According to the test and analysis results, 5 wt.% SBS reinforced polyester composite production is determined as the optimum ratio. 7 wt.% and above SBS reinforcement negatively affect the physical and chemical properties of the obtained composite. For example, when 10 wt.% SBS reinforced composite is examined by scanning electron microscope (SEM), and irregular pores are observed in the surface morphology. Also, it is understood by Fourier transform infrared spectroscopy (FTIR) that there is a physical interaction between SBS and polyester and that no chemical bond is formed. The thermal decomposition behavior of the composite has been determined according to the decrease in the activation energy. As SBS ratio increases, it is understood that the thermal stability of the product obtained with the decrease in the activation energy of the polyester composite weakens.
{"title":"Production of SBS Reinforced Polyester Composite: Characterization of Physical and Chemical Properties","authors":"H. Şahal, E. Aydoğmuş","doi":"10.18596/jotcsa.1208503","DOIUrl":"https://doi.org/10.18596/jotcsa.1208503","url":null,"abstract":"In this study, dissolved styrene butadiene styrene (SBS) copolymer is homogeneously reinforced into orthophthalic unsaturated polyester (UP) resin. Polyester composite production is carried out with the help of methyl ethyl ketone peroxide (MEKP) and cobalt octoate (Co Oc) catalysts. The density, Shore D hardness, thermal conductivity coefficient, thermal stability, morphological surface structure, and chemical bond structure of the obtained composite have been examined. According to the results, SBS reinforcement decreases the density of the composite and increases the thermal conductivity coefficient. The addition of SBS at different weight ratios (1%, 3%, 5%, 7%, and 10% w/w) reduces both the hardness and thermal stability of the polyester composite. According to the test and analysis results, 5 wt.% SBS reinforced polyester composite production is determined as the optimum ratio. 7 wt.% and above SBS reinforcement negatively affect the physical and chemical properties of the obtained composite. For example, when 10 wt.% SBS reinforced composite is examined by scanning electron microscope (SEM), and irregular pores are observed in the surface morphology. Also, it is understood by Fourier transform infrared spectroscopy (FTIR) that there is a physical interaction between SBS and polyester and that no chemical bond is formed. The thermal decomposition behavior of the composite has been determined according to the decrease in the activation energy. As SBS ratio increases, it is understood that the thermal stability of the product obtained with the decrease in the activation energy of the polyester composite weakens.","PeriodicalId":17299,"journal":{"name":"Journal of the Turkish Chemical Society Section A: Chemistry","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83381335","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}
Synthetic drugs show major side effects, as well as the fact that they have been discovered to be extremely harmful to human assistance, many synthetic medications claimed to be used for treatment are of the least interest today. Therefore, herbal medicines have acquired prominence in recent decades. This review's primary objective is to give a complete overview of three distinct species of the Genus Atalantia mainly Atalantia monophylla (Roxb) DC, Atalantia racemaosa Wight, Atalantia wightii Tanaka. The Genus Atalantia belongs to Rutaceae family and there are 22 accepted species of which three species are selected because these are available in Western Ghat region of Maharashtra, these species have ethnopharmacological significance and many of their facets are still unexplored. The Atalantia genus is utilized in conventional medicine to treat a diverse array of ailments like fever, rheumatic pains, cough, allergy, swelling, and as a blood purifier, etc. The current work is a comprehensive analysis of the published literature on phytochemical and pharmacological reports of the above species of Atalantia genus in an effort to deliver comprehensive information and suggest future research avenues. Out of these three species, Atalantia monophylla has received the most research attention but the remaining two species are not much explored. The aim of this review is to discuss the potential application of these three species as herbal medicine. The plant characteristics, ethnobotanical uses, phytochemistry, and pharmacological activities are summarized as a guide for phytochemical and pharmacological investigations.
{"title":"Ethnomedicinal Uses, Phytochemistry and Pharmacology of Few Species of Genus Atalantia (Rutaceae): A Review","authors":"Pournima Shelar, Santoshkumar Singh","doi":"10.18596/jotcsa.1252184","DOIUrl":"https://doi.org/10.18596/jotcsa.1252184","url":null,"abstract":"Synthetic drugs show major side effects, as well as the fact that they have been discovered to be extremely harmful to human assistance, many synthetic medications claimed to be used for treatment are of the least interest today. Therefore, herbal medicines have acquired prominence in recent decades. This review's primary objective is to give a complete overview of three distinct species of the Genus Atalantia mainly Atalantia monophylla (Roxb) DC, Atalantia racemaosa Wight, Atalantia wightii Tanaka. The Genus Atalantia belongs to Rutaceae family and there are 22 accepted species of which three species are selected because these are available in Western Ghat region of Maharashtra, these species have ethnopharmacological significance and many of their facets are still unexplored. The Atalantia genus is utilized in conventional medicine to treat a diverse array of ailments like fever, rheumatic pains, cough, allergy, swelling, and as a blood purifier, etc. The current work is a comprehensive analysis of the published literature on phytochemical and pharmacological reports of the above species of Atalantia genus in an effort to deliver comprehensive information and suggest future research avenues. Out of these three species, Atalantia monophylla has received the most research attention but the remaining two species are not much explored. The aim of this review is to discuss the potential application of these three species as herbal medicine. The plant characteristics, ethnobotanical uses, phytochemistry, and pharmacological activities are summarized as a guide for phytochemical and pharmacological investigations.","PeriodicalId":17299,"journal":{"name":"Journal of the Turkish Chemical Society Section A: Chemistry","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81735711","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}
Johnson Naat, Yantus A. B. Neolaka, Yosep Lawa, Petrus Noni̇ng, Ayu W.m Menno, R. Rosni̇ta, Fransiskus B.o. Weo, Dewi Lestarani, Sri Sugiarti, Diah Iswanti̇ni̇
In this article, we use a batch method to convey tyramine adsorption by modifying Takari natural sand-based silica with BSA and tyramine adsorption. The research stages include the optimization of adsorbent mass, pH, temperature, determination of the isotherm model, and thermodynamic parameters of tyramine adsorption. The tyramine concentration was determined using UV-Vis. The characterizations carried out were functional groups using FT-IR and surface morphology using SEM. The results of FT-IR characterization demonstrated the success of BSA modification, as observed in the C-H, N-H, and C-N groups, which are the typical functional groups of BSA. The SEM image of SiO2@BSA before tyramine adsorption revealed unevenly sized particles, uneven distribution, and agglomeration, leading to larger particles. The morphology of SiO2@BSA-tyramine appeared to be more uniform, exhibiting a smoother shape with a slightly uneven surface. The optimum pH was 5 (qe=11.74 mg/g), and the optimum temperature was 303 K (qe= 2.47 mg/g). The isotherm study showed that the adsorption adhered to the Redlich-Peterson isotherm model with an R2 value of 0.987 (qe=5.157 mg/g and n =3.759). The thermodynamic study demonstrated ∆Ho = 49.08 kJ/mol, ∆Go =-17.84; -20.05 and -22.26 kJ/mol, and ∆So =0.22 kJ/mol.K. These results indicated that the tyramine adsorption process on SiO2@BSA adsorbent occurred endothermically and spontaneously at the temperature of 303 K, and the adsorption was of a physical-chemical adsorption type.
{"title":"Tyramine Adsorption Using the Modification of Takari Natural Sand-Based Silica with Bovine Serum Albumin (BSA)","authors":"Johnson Naat, Yantus A. B. Neolaka, Yosep Lawa, Petrus Noni̇ng, Ayu W.m Menno, R. Rosni̇ta, Fransiskus B.o. Weo, Dewi Lestarani, Sri Sugiarti, Diah Iswanti̇ni̇","doi":"10.18596/jotcsa.1244774","DOIUrl":"https://doi.org/10.18596/jotcsa.1244774","url":null,"abstract":"In this article, we use a batch method to convey tyramine adsorption by modifying Takari natural sand-based silica with BSA and tyramine adsorption. The research stages include the optimization of adsorbent mass, pH, temperature, determination of the isotherm model, and thermodynamic parameters of tyramine adsorption. The tyramine concentration was determined using UV-Vis. The characterizations carried out were functional groups using FT-IR and surface morphology using SEM. The results of FT-IR characterization demonstrated the success of BSA modification, as observed in the C-H, N-H, and C-N groups, which are the typical functional groups of BSA. The SEM image of SiO2@BSA before tyramine adsorption revealed unevenly sized particles, uneven distribution, and agglomeration, leading to larger particles. The morphology of SiO2@BSA-tyramine appeared to be more uniform, exhibiting a smoother shape with a slightly uneven surface. The optimum pH was 5 (qe=11.74 mg/g), and the optimum temperature was 303 K (qe= 2.47 mg/g). The isotherm study showed that the adsorption adhered to the Redlich-Peterson isotherm model with an R2 value of 0.987 (qe=5.157 mg/g and n =3.759). The thermodynamic study demonstrated ∆Ho = 49.08 kJ/mol, ∆Go =-17.84; -20.05 and -22.26 kJ/mol, and ∆So =0.22 kJ/mol.K. These results indicated that the tyramine adsorption process on SiO2@BSA adsorbent occurred endothermically and spontaneously at the temperature of 303 K, and the adsorption was of a physical-chemical adsorption type.","PeriodicalId":17299,"journal":{"name":"Journal of the Turkish Chemical Society Section A: Chemistry","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139360854","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}
Pestil, often known as fruit leather, is one of the most significant traditional foods manufactured and consumed throughout Türkiye. Due to its practical consumption, the availability of numerous nutrients, and the ability to meet energy requirements, pestil is recognized as a snack food. The aim of this study was to evaluate the bioaccessibility of total phenolic compounds (TPC), antioxidant capacity (AOC), and β-carotene in pumpkin pestils dried by hot air drying (HAD), vacuum drying (VCD), and microwave drying (MD) methods using an in vitro digestion model. Additionally, 5-hydroxymethylfurfural (HMF) formation and color degradation of pestils were evaluated. Changes in TPC and AOC were determined using spectrophotometric methods, whereas the detections of β-carotene and HMF were carried out with high performance liquid chromatography–photodiode array detector (HPLC–PDA). Significantly higher TPC (10.99–105.70%) and AOC (15.30–118.58%, 21.88–401.04% and 89.28–482.14%, in CUPRAC, FRAP, and DPPH assays, respectively) values were observed after drying (p<0.05). Moreover, it was observed that there were statistically significant increases in TPC and AOC values after digestion for all pumpkin pestils compared to undigested samples (p<0.05). Drying process resulted in lower β-carotene content (between 32.15–61.11%) in pumpkin pestils; however, it increased the percentage of bioaccessible β-carotene (max 62.16%) in the pestil samples. Compared to HD and VCD techniques, pumpkin pestils dried with MD exhibited significantly higher TPC, AOC and β-carotene content (p<0.05). All of the pumpkin pestils except those dried by MD at 180 W contain HMF below the Turkish Standards Institute legal limit of 50 mg/kg. L* value of pestils were described adequately to the zero- and first-order kinetic models while a* and b* values were only fitted to zero-order model. In conclusion, the findings obtained in this study pointed out that drying processes (especially by MD method) increased the bioaccessibility of TPC, AOC, and β-carotene.
{"title":"Assessment of Total Phenolic Compounds, Antioxidant Capacity, β-Carotene Bioaccessibility, HMF Formation, and Color Degradation Kinetics in Pumpkin Pestils","authors":"Azime ÖZKAN KARABACAK","doi":"10.18596/jotcsa.1302567","DOIUrl":"https://doi.org/10.18596/jotcsa.1302567","url":null,"abstract":"Pestil, often known as fruit leather, is one of the most significant traditional foods manufactured and consumed throughout Türkiye. Due to its practical consumption, the availability of numerous nutrients, and the ability to meet energy requirements, pestil is recognized as a snack food. The aim of this study was to evaluate the bioaccessibility of total phenolic compounds (TPC), antioxidant capacity (AOC), and β-carotene in pumpkin pestils dried by hot air drying (HAD), vacuum drying (VCD), and microwave drying (MD) methods using an in vitro digestion model. Additionally, 5-hydroxymethylfurfural (HMF) formation and color degradation of pestils were evaluated. Changes in TPC and AOC were determined using spectrophotometric methods, whereas the detections of β-carotene and HMF were carried out with high performance liquid chromatography–photodiode array detector (HPLC–PDA). Significantly higher TPC (10.99–105.70%) and AOC (15.30–118.58%, 21.88–401.04% and 89.28–482.14%, in CUPRAC, FRAP, and DPPH assays, respectively) values were observed after drying (p<0.05). Moreover, it was observed that there were statistically significant increases in TPC and AOC values after digestion for all pumpkin pestils compared to undigested samples (p<0.05). Drying process resulted in lower β-carotene content (between 32.15–61.11%) in pumpkin pestils; however, it increased the percentage of bioaccessible β-carotene (max 62.16%) in the pestil samples. Compared to HD and VCD techniques, pumpkin pestils dried with MD exhibited significantly higher TPC, AOC and β-carotene content (p<0.05). All of the pumpkin pestils except those dried by MD at 180 W contain HMF below the Turkish Standards Institute legal limit of 50 mg/kg. L* value of pestils were described adequately to the zero- and first-order kinetic models while a* and b* values were only fitted to zero-order model. In conclusion, the findings obtained in this study pointed out that drying processes (especially by MD method) increased the bioaccessibility of TPC, AOC, and β-carotene.","PeriodicalId":17299,"journal":{"name":"Journal of the Turkish Chemical Society Section A: Chemistry","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85519081","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}
The marine environment can be a source of abundant bioactive compounds. One of the horseshoe crab species scattered in Indonesian sea waters is Tachypleus gigas. It was reported that the eggs of T. gigas contained flavonoids, saponins, alkaloids, and steroids. Flavonoids are polyphenol compounds that have the ability as natural antioxidants. In this study, total phenolics, flavonoids, and antioxidant activity tests were carried out on the methanol extract of T. gigas eggs. The total phenolics content used the Folin Ciocalteu method, the total flavonoids used the aluminum chloride colorimetric method, and the antioxidant activity test used the FRAP and DPPH methods. The test results showed that the total phenolics and flavonoids were 0.53506 ± 0.001335 mg GAE/g extract and 0.52067 ± 0.000731 mg QE/g extract, respectively. Meanwhile, the results of the antioxidant activity test with the FRAP method obtained a total antioxidant capacity of 29.85 μmol in the medium category and antioxidant activity with the DPPH method obtained an IC50 value of 597.0397 μg/mL in the very weak category.
{"title":"Comparison on Total Phenolics and Flavonoids and Antioxidant Activities of Methanol Extract of Horseshoe Crab (Tachypleus gigas) Eggs","authors":"Elvira Ratna Ai̇sa, T. Tukiran","doi":"10.18596/jotcsa.1243140","DOIUrl":"https://doi.org/10.18596/jotcsa.1243140","url":null,"abstract":"The marine environment can be a source of abundant bioactive compounds. One of the horseshoe crab species scattered in Indonesian sea waters is Tachypleus gigas. It was reported that the eggs of T. gigas contained flavonoids, saponins, alkaloids, and steroids. Flavonoids are polyphenol compounds that have the ability as natural antioxidants. In this study, total phenolics, flavonoids, and antioxidant activity tests were carried out on the methanol extract of T. gigas eggs. The total phenolics content used the Folin Ciocalteu method, the total flavonoids used the aluminum chloride colorimetric method, and the antioxidant activity test used the FRAP and DPPH methods. The test results showed that the total phenolics and flavonoids were 0.53506 ± 0.001335 mg GAE/g extract and 0.52067 ± 0.000731 mg QE/g extract, respectively. Meanwhile, the results of the antioxidant activity test with the FRAP method obtained a total antioxidant capacity of 29.85 μmol in the medium category and antioxidant activity with the DPPH method obtained an IC50 value of 597.0397 μg/mL in the very weak category.","PeriodicalId":17299,"journal":{"name":"Journal of the Turkish Chemical Society Section A: Chemistry","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91214007","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}
Trivalent Eu-activated CoNb2O6 phosphors were fabricated using the molten salt method, which provides enhanced homogeneity and low sintering temperature. The ceramic samples were examined by spectral and structural analyses. In X-ray diffractions, the single phase of orthorhombic columbite type CoNb2O6 structure was obtained for 0.5-10 mol% Eu3+ doping concentrations, while a two theta peak shift towards the smaller angles occurred. SEM examinations show an irregular morphology and sub-micron grain sizes. In photoluminescence (PL) spectra, the phosphors showed typical Eu3+ emissions with the 5F0 → 7FJ (J=0, 1, 2, 3, 4) transitions, and high emission peaks were observed at the 5D0 → 7F2 transition. The photoluminescence of CoNb2O6:Eu3+ decreased over 5 mol% because of the concentration quenching. The energy transfer mechanism and critical distance of the phosphor are the dipole-dipole (d–d) interaction, and 15.70 Å, respectively. The spectral features of the phosphors were assessed by calculating the Judd-Ofelt intensity parameters (Ω2, Ω4) from the PL emission spectrum. The low Ω2 parameter values or/and the Ω4>Ω2 trend for CoNb2O6:Eu3+ phosphors were related to the less covalent or more ionic character of the Eu3+–O2˗ bond and the high local symmetry of the Eu3+ sites, while the high Ω4 parameter values may be ascribed to the decrease in the electron density in the ligands.
{"title":"Structural Properties, Photoluminescence, and Judd-Ofelt Parameters of Eu3+- Doped CoNb2O6 Phosphor","authors":"M. İlhan, Lütfiye Feray Güleryüz, M. K. Ekmekçİ","doi":"10.18596/jotcsa.1294230","DOIUrl":"https://doi.org/10.18596/jotcsa.1294230","url":null,"abstract":"Trivalent Eu-activated CoNb2O6 phosphors were fabricated using the molten salt method, which provides enhanced homogeneity and low sintering temperature. The ceramic samples were examined by spectral and structural analyses. In X-ray diffractions, the single phase of orthorhombic columbite type CoNb2O6 structure was obtained for 0.5-10 mol% Eu3+ doping concentrations, while a two theta peak shift towards the smaller angles occurred. SEM examinations show an irregular morphology and sub-micron grain sizes. In photoluminescence (PL) spectra, the phosphors showed typical Eu3+ emissions with the 5F0 → 7FJ (J=0, 1, 2, 3, 4) transitions, and high emission peaks were observed at the 5D0 → 7F2 transition. The photoluminescence of CoNb2O6:Eu3+ decreased over 5 mol% because of the concentration quenching. The energy transfer mechanism and critical distance of the phosphor are the dipole-dipole (d–d) interaction, and 15.70 Å, respectively. The spectral features of the phosphors were assessed by calculating the Judd-Ofelt intensity parameters (Ω2, Ω4) from the PL emission spectrum. The low Ω2 parameter values or/and the Ω4>Ω2 trend for CoNb2O6:Eu3+ phosphors were related to the less covalent or more ionic character of the Eu3+–O2˗ bond and the high local symmetry of the Eu3+ sites, while the high Ω4 parameter values may be ascribed to the decrease in the electron density in the ligands.","PeriodicalId":17299,"journal":{"name":"Journal of the Turkish Chemical Society Section A: Chemistry","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88268774","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}
This work includes the development of two spectrophotometric methods which are sensitive, accurate, stable, and has good recovery for the determination of phenylephrine-HCl as free form and in the pharmaceutical preparations. In the method (A), phenylephrine is oxidized by potassium permanganate in a basic solution of sodium hydroxide and the bluish-green color of the resulting manganate (MnO 42- ) is measured at wavelength 610 nm, which is linearly proportional to the amount of phenylephrine-HCl. Method (B), is involved the oxidation of phenylephrine-HCl by using an excess amount of N-bromosuccinimide in an acidic medium of hydrochloric acid solution, the remaining (unreacted) amount of N-bromosuccinimide is used to bleach indigo carmine dye and the absorbance of the blue color of the remaining dye is measured at the wavelength of 610 nm. which is directly proportional to the concentration of phenylephrine-HCl. The molar absorptivity coefficients of methods (A) and (B) are estimated and equal to 1.5722×10 4 and 5.5191×10 4 L/mol.cm, respectively. Beer’s law of the both methods are linear in the concentration ranges 0.2–8.0 µg/mL (method A) and 0.2–3.5 µg/mL (method B). The relative standard deviation values of methods (A) and (B) are also found to be better than 0.0286 and 0.0114, respectively. The two proposed methods are applied to estimate phenylephrine-HCl in injection and drop.
{"title":"Development of Two Simple Spectrophotometric Methods to Assay Phenylephrine-HCl as Pure Form And in Its Drug Forms","authors":"Hanan Hameed, Salim Ali","doi":"10.18596/jotcsa.1260666","DOIUrl":"https://doi.org/10.18596/jotcsa.1260666","url":null,"abstract":"This work includes the development of two spectrophotometric methods which are sensitive, accurate, stable, and has good recovery for the determination of phenylephrine-HCl as free form and in the pharmaceutical preparations. In the method (A), phenylephrine is oxidized by potassium permanganate in a basic solution of sodium hydroxide and the bluish-green color of the resulting manganate (MnO 42- ) is measured at wavelength 610 nm, which is linearly proportional to the amount of phenylephrine-HCl. Method (B), is involved the oxidation of phenylephrine-HCl by using an excess amount of N-bromosuccinimide in an acidic medium of hydrochloric acid solution, the remaining (unreacted) amount of N-bromosuccinimide is used to bleach indigo carmine dye and the absorbance of the blue color of the remaining dye is measured at the wavelength of 610 nm. which is directly proportional to the concentration of phenylephrine-HCl. The molar absorptivity coefficients of methods (A) and (B) are estimated and equal to 1.5722×10 4 and 5.5191×10 4 L/mol.cm, respectively. Beer’s law of the both methods are linear in the concentration ranges 0.2–8.0 µg/mL (method A) and 0.2–3.5 µg/mL (method B). The relative standard deviation values of methods (A) and (B) are also found to be better than 0.0286 and 0.0114, respectively. The two proposed methods are applied to estimate phenylephrine-HCl in injection and drop.","PeriodicalId":17299,"journal":{"name":"Journal of the Turkish Chemical Society Section A: Chemistry","volume":"141 3-4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91489718","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}
Anthraquinone and its derivatives are considered intermediate agents with superior properties due to their activities in chemical and biological reaction. A new, economical, practical and one-step synthesis method was developed by our research team for the synthesis of amino and thioanthraquinones in previous studies (1). With this synthesis method, thioanthraquinone analogs 2(a-d) were obtained from 1,5-Dichloroanthraquinone (1) and bioactive thiols. The synthesized organic molecules were purified by column chromatography and their structures were identified with spectroscopic methods. Fluorescence analyzes of synthesized thioanthraquinone analogues were performed. It was determined that all thioanthraquinone analogues synthesized and characterized in the study showed fluorescence activity. These new analogues with fluorescence are expected to find application in drug delivery systems and sensor studies.
{"title":"Design, Synthesis and Structural Characterization of Novel Thioanthraquinone Analogues from 1,5-Dichloroanthraquinone","authors":"Funda Özkök","doi":"10.18596/jotcsa.1240673","DOIUrl":"https://doi.org/10.18596/jotcsa.1240673","url":null,"abstract":"Anthraquinone and its derivatives are considered intermediate agents with superior properties due to their activities in chemical and biological reaction. A new, economical, practical and one-step synthesis method was developed by our research team for the synthesis of amino and thioanthraquinones in previous studies (1). With this synthesis method, thioanthraquinone analogs 2(a-d) were obtained from 1,5-Dichloroanthraquinone (1) and bioactive thiols. The synthesized organic molecules were purified by column chromatography and their structures were identified with spectroscopic methods. Fluorescence analyzes of synthesized thioanthraquinone analogues were performed. It was determined that all thioanthraquinone analogues synthesized and characterized in the study showed fluorescence activity. These new analogues with fluorescence are expected to find application in drug delivery systems and sensor studies.","PeriodicalId":17299,"journal":{"name":"Journal of the Turkish Chemical Society Section A: Chemistry","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74460468","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}
This paper describes a selective and fairly stable colorimetric approach to determine trace amounts of arsenic conjugated with nanosilica-cysteine composite in various aqueous and biological samples in milligram per liter (mg/L) using Leucocrystal Violet (LCV) as a chromogenic reagent. Attenuated total reflectance-Fourier-transform infrared (ATR-FTIR) spectroscopy analysis was applied to characterize the composite. Novelty of this method is dealing with the presence of nanosilica which is reflected in the difficulty of obtaining a clear solution. The maximum absorbance is measured and Beer's law shows linearity over the concentration range of (0.75 to 5.00 mg/L) of As(III) at 590 nm. The molar absorptivity, Sandell’s sensitivity, and detection limit of the method were found to be 6.00 × 105 L/mol.cm, 8.55 × 10-2 μg/cm2, and 0.043 mg/L, respectively. The optimum reaction conditions and other analytical parameters were evaluated. Arsenic was successfully detected in a variety of aqueous and biological samples using the proposed method.
{"title":"A Simple, Stable, and Highly Sensitive Spectrophotometric Method for the Determination of Arsenic(III) from Different Biological Media in the Presence of Nanosilica-Cysteine Composite","authors":"Omar Alnasra, F. Khalili","doi":"10.18596/jotcsa.1273473","DOIUrl":"https://doi.org/10.18596/jotcsa.1273473","url":null,"abstract":"This paper describes a selective and fairly stable colorimetric approach to determine trace amounts of arsenic conjugated with nanosilica-cysteine composite in various aqueous and biological samples in milligram per liter (mg/L) using Leucocrystal Violet (LCV) as a chromogenic reagent. Attenuated total reflectance-Fourier-transform infrared (ATR-FTIR) spectroscopy analysis was applied to characterize the composite. Novelty of this method is dealing with the presence of nanosilica which is reflected in the difficulty of obtaining a clear solution. The maximum absorbance is measured and Beer's law shows linearity over the concentration range of (0.75 to 5.00 mg/L) of As(III) at 590 nm. The molar absorptivity, Sandell’s sensitivity, and detection limit of the method were found to be 6.00 × 105 L/mol.cm, 8.55 × 10-2 μg/cm2, and 0.043 mg/L, respectively. The optimum reaction conditions and other analytical parameters were evaluated. Arsenic was successfully detected in a variety of aqueous and biological samples using the proposed method.","PeriodicalId":17299,"journal":{"name":"Journal of the Turkish Chemical Society Section A: Chemistry","volume":"113 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77069729","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}
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