Shadi Najjarsadeghi, Hossein Nazemiyeh, Somayeh Vandghanooni, Hadi Ghanbari, S. Hamedeyazdan
Loranthus europaeus with numerous therapeutic usages was chosen for further bioactivity assays and phytochemical analysis. The air‐dried grounded L. europaeus fruits were solvent extracted via Soxhlet apparatus. Afterwards, methanol extract was fractionated via different chromatographic methods and structures of the isolated pure compounds were elucidated with relative nuclear magnetic resonance spectra. Additionally, L. europaeus fruits essential oil was achieved through hydrodistillation and analyzed via gas chromatography‐mass spectrometry. Besides, the in vitro DPPH and nitric oxide antioxidant property of L. europaeus methanol extract alongside its phenolic and flavonoids content were evaluated. MTT (3‐(4,5‐dimethylthiazol‐2‐yl)‐2,5‐diphenyltetrazolium bromide) assay was carried out in A549 cancer cells and normal HUVECs cells for evaluating cytotoxicity of the plant extract and essential oil. Structure of the isolated major compounds of the extract were determined as two flavonoids. Analysis of the L. europaeus essential oil showed that it principally contained germacrene D (32.8%), β‐caryophyllene (19.2%) and alloaromadendrene (11.0%). In the MTT assay, 300 µg/mL of methanol extract caused ≈60% A549 cells death after 48 h with IC50 of 226 µg/mL. Likewise, the IC50 of the essential oil against A‐549 cell line for the 100 µg/mL L. europaeus fruits in 48 h was equal to 69 µg/mL. Overall, the present study is the first report on the phytochemical analysis of L. europaeus revealing occurrence of rhamnocitrin‐3‐O‐rhamnoside and rhamnetin‐3‐O‐rhamnoside in the plant extract alongside its high content of sesquiterpenoids in its essential oil. The observed antiproliferative activity of L. europaeus methanol extract against A549 cancer cells rather than healthy cells indicated its anti‐tumor properties which might be related to the high values of phenolic and flavonoids content in the methanol extract of the plant associated with its superior in vitro antioxidant activities.
{"title":"Antiproliferative, antioxidant and phytochemical analysis of Loranthus europaeus fruits","authors":"Shadi Najjarsadeghi, Hossein Nazemiyeh, Somayeh Vandghanooni, Hadi Ghanbari, S. Hamedeyazdan","doi":"10.1002/vjch.202300251","DOIUrl":"https://doi.org/10.1002/vjch.202300251","url":null,"abstract":"Loranthus europaeus with numerous therapeutic usages was chosen for further bioactivity assays and phytochemical analysis. The air‐dried grounded L. europaeus fruits were solvent extracted via Soxhlet apparatus. Afterwards, methanol extract was fractionated via different chromatographic methods and structures of the isolated pure compounds were elucidated with relative nuclear magnetic resonance spectra. Additionally, L. europaeus fruits essential oil was achieved through hydrodistillation and analyzed via gas chromatography‐mass spectrometry. Besides, the in vitro DPPH and nitric oxide antioxidant property of L. europaeus methanol extract alongside its phenolic and flavonoids content were evaluated. MTT (3‐(4,5‐dimethylthiazol‐2‐yl)‐2,5‐diphenyltetrazolium bromide) assay was carried out in A549 cancer cells and normal HUVECs cells for evaluating cytotoxicity of the plant extract and essential oil. Structure of the isolated major compounds of the extract were determined as two flavonoids. Analysis of the L. europaeus essential oil showed that it principally contained germacrene D (32.8%), β‐caryophyllene (19.2%) and alloaromadendrene (11.0%). In the MTT assay, 300 µg/mL of methanol extract caused ≈60% A549 cells death after 48 h with IC50 of 226 µg/mL. Likewise, the IC50 of the essential oil against A‐549 cell line for the 100 µg/mL L. europaeus fruits in 48 h was equal to 69 µg/mL. Overall, the present study is the first report on the phytochemical analysis of L. europaeus revealing occurrence of rhamnocitrin‐3‐O‐rhamnoside and rhamnetin‐3‐O‐rhamnoside in the plant extract alongside its high content of sesquiterpenoids in its essential oil. The observed antiproliferative activity of L. europaeus methanol extract against A549 cancer cells rather than healthy cells indicated its anti‐tumor properties which might be related to the high values of phenolic and flavonoids content in the methanol extract of the plant associated with its superior in vitro antioxidant activities.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140667961","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}
Md Mahamud Hasan Tusher, Golam Murtaza Mirza, Akib Jabed, Alisan Imam, Ahsanul Alam Kabhi, Nazmus Sakib, Md. Naymul Islam
Thin films of pure and Mg‐doped ZnO (MZO) were successfully fabricated on glass substrates by sol–gel spin coating method. Microstructure, surface morphology, elemental composition, optical analysis, and Mg doping effect on the photocatalytic performance of the thin films have been measured by XRD, SEM, EDS, and UV–Vis, respectively. XRD analysis showed that ZnO and MZO thin films have a hexagonal wurtzite structure, and the intensity of the (0 0 2) peak moved from higher to lower angle and right to left with rising Mg‐dopant concentration, and crystallinity was enhanced with doping, whereas micro‐strain and dislocation density dropped. SEM analysis found that ZnO had spherical and agglomerated structures, and the increased size of the grains was observed with increasing doping. The optical analysis demonstrated that the band gaps increased as the dopant percentage increased. Methylene blue, a dye pollutant, examined the thin films’ photocatalytic performance. It was demonstrated that the addition of the Mg to the ZnO lattices increased the absorption of the hydroxyl ions at the surface of the thin film and hence acted as a trap site, leading to a decrease in the electron–hole pair and consequently enhancing the photodegradation.
{"title":"Impact of Mg‐doping on morphology, structure, optical properties, and enhancing photocatalytic performance of ZnO thin films, prepared by sol–gel spin‐coated method","authors":"Md Mahamud Hasan Tusher, Golam Murtaza Mirza, Akib Jabed, Alisan Imam, Ahsanul Alam Kabhi, Nazmus Sakib, Md. Naymul Islam","doi":"10.1002/vjch.202300191","DOIUrl":"https://doi.org/10.1002/vjch.202300191","url":null,"abstract":"Thin films of pure and Mg‐doped ZnO (MZO) were successfully fabricated on glass substrates by sol–gel spin coating method. Microstructure, surface morphology, elemental composition, optical analysis, and Mg doping effect on the photocatalytic performance of the thin films have been measured by XRD, SEM, EDS, and UV–Vis, respectively. XRD analysis showed that ZnO and MZO thin films have a hexagonal wurtzite structure, and the intensity of the (0 0 2) peak moved from higher to lower angle and right to left with rising Mg‐dopant concentration, and crystallinity was enhanced with doping, whereas micro‐strain and dislocation density dropped. SEM analysis found that ZnO had spherical and agglomerated structures, and the increased size of the grains was observed with increasing doping. The optical analysis demonstrated that the band gaps increased as the dopant percentage increased. Methylene blue, a dye pollutant, examined the thin films’ photocatalytic performance. It was demonstrated that the addition of the Mg to the ZnO lattices increased the absorption of the hydroxyl ions at the surface of the thin film and hence acted as a trap site, leading to a decrease in the electron–hole pair and consequently enhancing the photodegradation.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140672082","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}
Sadaf Nazir, Saima Masood, S. Shivashankar, Faheem A. Sheikh, Shafquat Majeed
Due to the wide bandgap, monoclinic structure and thermodynamic stability, β‐polymorph form of Ga2O3 nanomaterials is well‐received for various applications. However, as the γ‐Ga2O3 is difficult to synthesize, less attention has been paid towards it and its conversion to β‐polymorph. This paper reports the single‐step synthesis of γ‐Ga2O3 using a microwave‐assisted procedure. In this regard, γ‐Ga2O3 powders are synthesized in minutes using benzyl alcohol as the solvent using gallium acetylacetone as the precursor. The XRD of the as‐prepared powders indicates the formation of the γ‐Ga2O3 phase, the very broad peaks indicative of the small crystallite size as confirmed by TEM. The γ‐Ga2O3 powders were annealed at different temperatures and the complete phase conversion of γ‐Ga2O3 phase to β‐Ga2O3 phase happens at 700 °C. The TEM analysis shows the crystallite size to be ≈10 nm for the annealed β‐Ga2O3 phase. The as‐prepared nanopowders show very weak luminescence under excitation and in contrast, a blue‐green emission is observed in case of annealed powders. This confirms the presented strategy as having the potential to use β‐Ga2O3 nanopowders for different optoelectronic applications.
{"title":"A facile route to synthesize β‐Ga2O3 nanoparticles from γ‐polymorph through a rapid microwave route and their optical properties","authors":"Sadaf Nazir, Saima Masood, S. Shivashankar, Faheem A. Sheikh, Shafquat Majeed","doi":"10.1002/vjch.202300420","DOIUrl":"https://doi.org/10.1002/vjch.202300420","url":null,"abstract":"Due to the wide bandgap, monoclinic structure and thermodynamic stability, β‐polymorph form of Ga2O3 nanomaterials is well‐received for various applications. However, as the γ‐Ga2O3 is difficult to synthesize, less attention has been paid towards it and its conversion to β‐polymorph. This paper reports the single‐step synthesis of γ‐Ga2O3 using a microwave‐assisted procedure. In this regard, γ‐Ga2O3 powders are synthesized in minutes using benzyl alcohol as the solvent using gallium acetylacetone as the precursor. The XRD of the as‐prepared powders indicates the formation of the γ‐Ga2O3 phase, the very broad peaks indicative of the small crystallite size as confirmed by TEM. The γ‐Ga2O3 powders were annealed at different temperatures and the complete phase conversion of γ‐Ga2O3 phase to β‐Ga2O3 phase happens at 700 °C. The TEM analysis shows the crystallite size to be ≈10 nm for the annealed β‐Ga2O3 phase. The as‐prepared nanopowders show very weak luminescence under excitation and in contrast, a blue‐green emission is observed in case of annealed powders. This confirms the presented strategy as having the potential to use β‐Ga2O3 nanopowders for different optoelectronic applications.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140669509","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 human body, drug‐neurotransmitter interactions have been the most significant process. Whereas, adverse reactions may be accompanied by unexpected interaction, which puts an individual in danger of life. Thus, the interactions between adenosine (ADN) and sodium valproate (SV) with caffeine (CAF), theophylline (TPY) and γ‐amino butyric acid (GABA) have been studied. Various properties like densities, ρ and speed of sound, u, have been used to calculate apparent molar volumes (V2,ϕ) and apparent molar isentropic compression (Ks,2,ϕ) for ADN and SV in aqueous (5, 10, 15 and 20 mmol kg−1) CAF, TPY and GABA solutions at T = (288.15–318.15) K and at pressure p = 1 × 105 Pa. The results of various interactions that occurred by mixing the solutions have been interpreted. Exothermicity is indicated by the negative values of standard molar enthalpy of transfer, ΔtrΔdilH0, obtained from the calorimetry. UV‐absorption and 1H NMR studies suggest that there is a dominance of solute‐cosolute interactions due to hyperchromic shift and shielding effect.
在人体中，药物与神经递质的相互作用是最重要的过程。而不良反应可能伴随着意想不到的相互作用，使人面临生命危险。因此，我们研究了腺苷（ADN）和丙戊酸钠（SV）与咖啡因（CAF）、茶碱（TPY）和γ-氨基丁酸（GABA）之间的相互作用。在 T = (288.15-318.15) K 和压力 p = 1 × 105 Pa 条件下，利用密度 ρ 和声速 u 等各种特性计算了 ADN 和 SV 在 CAF、TPY 和 GABA 水溶液（5、10、15 和 20 mmol kg-1）中的表观摩尔体积 (V2,ϕ) 和表观摩尔等熵压缩率 (Ks,2,j)。热量计得出的标准摩尔转移焓 ΔtrΔdilH0 的负值表明存在放热现象。紫外线吸收和 1H NMR 研究表明，由于高色度偏移和屏蔽效应，溶质与溶质之间的相互作用占主导地位。
{"title":"Physicochemical studies of adenosine in the presence of aqueous caffeine and theophylline solutions, & sodium valproate with γ‐amino butyric acid in aqueous medium at T = (288.15–318.15) K and at p = 1 × 105 Pa","authors":"Aashima Beri, R. Kant, T. S. Banipal","doi":"10.1002/vjch.202300149","DOIUrl":"https://doi.org/10.1002/vjch.202300149","url":null,"abstract":"In human body, drug‐neurotransmitter interactions have been the most significant process. Whereas, adverse reactions may be accompanied by unexpected interaction, which puts an individual in danger of life. Thus, the interactions between adenosine (ADN) and sodium valproate (SV) with caffeine (CAF), theophylline (TPY) and γ‐amino butyric acid (GABA) have been studied. Various properties like densities, ρ and speed of sound, u, have been used to calculate apparent molar volumes (V2,ϕ) and apparent molar isentropic compression (Ks,2,ϕ) for ADN and SV in aqueous (5, 10, 15 and 20 mmol kg−1) CAF, TPY and GABA solutions at T = (288.15–318.15) K and at pressure p = 1 × 105 Pa. The results of various interactions that occurred by mixing the solutions have been interpreted. Exothermicity is indicated by the negative values of standard molar enthalpy of transfer, ΔtrΔdilH0, obtained from the calorimetry. UV‐absorption and 1H NMR studies suggest that there is a dominance of solute‐cosolute interactions due to hyperchromic shift and shielding effect.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140666889","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}
Le Van Khoe, Hà Mạnh Hùng, Hoang Thi Thuy, Pham Huy Binh, Bui Tuan Anh, Le Minh Duc, Nguyen Thi Huong, Doan Thi Yen Oanh, Nguyen Xuan Thai, Vu Quoc Trung
Polypyrrole/SiO2 nanocomposite doped with 3‐nitrosalicylic acid was synthesized in three concentrations of 3‐nitrosalicylic acid: 0.01 m, 0.005 m, and 0.0025 m. FTIR spectroscopy, thermogravimetric analysis (TGA), Raman scattering spectroscopy, and FESEM imaging further assisted in determining the shape and structure of the polypyrrole/nanocomposite product. The aluminum protection arrangement of the paint film comprising polypyrrole/SiO2 nanocomposite doped with 3‐nitrosalicylic acid was proven by electrochemical methods. The salt spray test results also demonstrated the protective efficacy of the paint film comprising polypyrrole/SiO2 nanocomposite doped with 3‐nitrosalicylic acid to suppress corrosion. The best corrosion prevention results were obtained with a polypyrrole/SiO2 nanocomposite dispersion paint film doped with 0.01 m 3‐nitrosalicylic acid at a concentration of 2%.
傅立叶红外光谱、热重分析（TGA）、拉曼散射光谱和 FESEM 成像进一步帮助确定了聚吡咯/纳米复合材料产品的形状和结构。电化学方法证明了掺杂了 3-亚硝基水杨酸的聚吡咯/二氧化硅纳米复合材料漆膜的铝保护性能。盐雾试验结果也证明了由掺杂了 3-亚硝基水杨酸的聚吡咯/二氧化硅纳米复合材料组成的漆膜具有抑制腐蚀的保护功效。浓度为 2% 的聚吡咯/二氧化硅纳米复合材料分散漆膜掺杂了 0.01 m 3-亚硝基水杨酸，防腐蚀效果最佳。
{"title":"Preparation and corrosion protection of polypyrrole/SiO2 nanocomposite doped with 3‐nitrosalicylic acid on aluminum","authors":"Le Van Khoe, Hà Mạnh Hùng, Hoang Thi Thuy, Pham Huy Binh, Bui Tuan Anh, Le Minh Duc, Nguyen Thi Huong, Doan Thi Yen Oanh, Nguyen Xuan Thai, Vu Quoc Trung","doi":"10.1002/vjch.202400042","DOIUrl":"https://doi.org/10.1002/vjch.202400042","url":null,"abstract":"Polypyrrole/SiO2 nanocomposite doped with 3‐nitrosalicylic acid was synthesized in three concentrations of 3‐nitrosalicylic acid: 0.01 m, 0.005 m, and 0.0025 m. FTIR spectroscopy, thermogravimetric analysis (TGA), Raman scattering spectroscopy, and FESEM imaging further assisted in determining the shape and structure of the polypyrrole/nanocomposite product. The aluminum protection arrangement of the paint film comprising polypyrrole/SiO2 nanocomposite doped with 3‐nitrosalicylic acid was proven by electrochemical methods. The salt spray test results also demonstrated the protective efficacy of the paint film comprising polypyrrole/SiO2 nanocomposite doped with 3‐nitrosalicylic acid to suppress corrosion. The best corrosion prevention results were obtained with a polypyrrole/SiO2 nanocomposite dispersion paint film doped with 0.01 m 3‐nitrosalicylic acid at a concentration of 2%.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140668880","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}
L. Lamiri, B. Kahouadji, Oulkhiari Ilham, Abdelhalim Zoukel, L. Benchallal, Salim Ouhenia, A. Souici, Fares Boudjouan, Lamine Mebarki, Bachiri Meriem, Khalida Chabane, Guerbous Lakhdar, Madani Samah
In this article, the authors delve into the synthesis of Y2O3:Sm3+ nanopowders using the sol–gel method, employing organic agents such as ethylene glycol (EG) and polyethylene glycol (PEG). This thorough investigation focuses on the structural, morphological, and photoluminescence characteristics of these nanopowders, with particular consideration for their potential applications in the field of optical devices. X‐ray diffraction patterns indicate that all powders crystallize in pure cubic phases (Ia‐3). Transmission electron microscopy (TEM) analysis reveals the presence of particles with dimensions less than 70 nm. Specifically, morphological and structural data suggest that the crystallite size of nanopowders prepared with PEG exceeds that of nanopowders prepared with EG. In exploring the photoluminescence properties, the emission spectra of the powders, recorded at λem = 600 nm, exhibit two absorption bands attributed to the charge transfer state (CTS) from O2− → Sm3+, with a maximum absorption at 223 nm, and to the intraconfigurational transition 4f5‐4f5 of Sm3+. A red/orange emission, attributed to the 4G5/2 → 6H7/2 transition, predominates under these conditions. A significant improvement in the intensity of photoluminescence is notably observed in samples prepared with organic agents compared to those prepared without agents. Finally, chromatic coordinates underscore the strong potential of Y2O3:Sm3+ nanopowders as promising phosphors for lighting applications.
{"title":"Structural and photoluminescence investigation of Y2O3:Sm3+ nano‐powders: Organic agent's effect","authors":"L. Lamiri, B. Kahouadji, Oulkhiari Ilham, Abdelhalim Zoukel, L. Benchallal, Salim Ouhenia, A. Souici, Fares Boudjouan, Lamine Mebarki, Bachiri Meriem, Khalida Chabane, Guerbous Lakhdar, Madani Samah","doi":"10.1002/vjch.202300394","DOIUrl":"https://doi.org/10.1002/vjch.202300394","url":null,"abstract":"In this article, the authors delve into the synthesis of Y2O3:Sm3+ nanopowders using the sol–gel method, employing organic agents such as ethylene glycol (EG) and polyethylene glycol (PEG). This thorough investigation focuses on the structural, morphological, and photoluminescence characteristics of these nanopowders, with particular consideration for their potential applications in the field of optical devices. X‐ray diffraction patterns indicate that all powders crystallize in pure cubic phases (Ia‐3). Transmission electron microscopy (TEM) analysis reveals the presence of particles with dimensions less than 70 nm. Specifically, morphological and structural data suggest that the crystallite size of nanopowders prepared with PEG exceeds that of nanopowders prepared with EG. In exploring the photoluminescence properties, the emission spectra of the powders, recorded at λem = 600 nm, exhibit two absorption bands attributed to the charge transfer state (CTS) from O2− → Sm3+, with a maximum absorption at 223 nm, and to the intraconfigurational transition 4f5‐4f5 of Sm3+. A red/orange emission, attributed to the 4G5/2 → 6H7/2 transition, predominates under these conditions. A significant improvement in the intensity of photoluminescence is notably observed in samples prepared with organic agents compared to those prepared without agents. Finally, chromatic coordinates underscore the strong potential of Y2O3:Sm3+ nanopowders as promising phosphors for lighting applications.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140667591","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}
PAN/Ag2S nanofibers prepared by combining conventional electrospinning technology and facile gas–solid reaction were used to activate peroxymonosulfate for Rhodamine B (RhB) degradation by photocatalysis using visible light. The material properties were analyzed by UV–Vis–NIR, XRD, SEM, FTIR, EIS, and BET techniques. The results indicated that Ag2S nanoparticles with a size of ≈10–20 nm were homogeneously attached to the nanofiber surface. The PAN/Ag2S can remove 96.98% RhB (5 mg L−1) after 120 min at pH 7. Through the identification of reactive oxygen species (ROSs) and the calculation of band gap and band potentials, the photocatalytic mechanism was proposed. Results from the identification of ROSs demonstrate that the contribution of the ROSs was in the order of h+ > 1O2 ≈ O2•− ≈ SO4•− > HO• in which h+ has an important role in RhB degradation. The as‐prepared PAN/Ag2S nanofibers with high photocatalytic activity, effective working under visible light, high flexibility, and easy recovery from the aqueous phase, have the potential for practical applications in wastewater treatment.
{"title":"Efficient Rhodamine B removal by photocatalysis using polyacrylonitrile/Ag2S nanofibers prepared by combining electrospinning technology and facile gas–solid reaction","authors":"V. D. Thao, Nguyen Trung Dung, N. Huy","doi":"10.1002/vjch.202300307","DOIUrl":"https://doi.org/10.1002/vjch.202300307","url":null,"abstract":"PAN/Ag2S nanofibers prepared by combining conventional electrospinning technology and facile gas–solid reaction were used to activate peroxymonosulfate for Rhodamine B (RhB) degradation by photocatalysis using visible light. The material properties were analyzed by UV–Vis–NIR, XRD, SEM, FTIR, EIS, and BET techniques. The results indicated that Ag2S nanoparticles with a size of ≈10–20 nm were homogeneously attached to the nanofiber surface. The PAN/Ag2S can remove 96.98% RhB (5 mg L−1) after 120 min at pH 7. Through the identification of reactive oxygen species (ROSs) and the calculation of band gap and band potentials, the photocatalytic mechanism was proposed. Results from the identification of ROSs demonstrate that the contribution of the ROSs was in the order of h+ > 1O2 ≈ O2•− ≈ SO4•− > HO• in which h+ has an important role in RhB degradation. The as‐prepared PAN/Ag2S nanofibers with high photocatalytic activity, effective working under visible light, high flexibility, and easy recovery from the aqueous phase, have the potential for practical applications in wastewater treatment.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140677047","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 present investigation reports an effective, environmentally benevolent method for the removal of pharmaceutical waste from the contaminated water. Popular fluoroquinolone antibiotic prulifloxacin residue was taken as a sample of contaminant. Different irradiation conditions were used to explore the ability of TiO2 nanoparticles in the photodegradation of prulifloxacin. Aqueous lichen extract was used to fabricate the TiO2 nanoparticles. The assessment of the physical and chemical properties of the fabricated materials was examined by using well‐established analytical methodologies. The UV–vis spectra depicted the surface plasmon resonance peak at 282 nm. The XRD spectra revealed the particle nature of the developed nanomaterials and the result of the XRD spectrum depicted that the average diameter of the fabricated materials was found to be in the range of 20–30 nm. The FTIR spectra depicted the characteristic band at 750 cm−1, which corresponded to the Ti─O stretching mode of vibration. The SEM micrograph of the developed nanoparticles exhibited the irregular morphology of the developed nanoparticles. The present report critically analyzes the possible route of the degradation of prulifloxacin in the presence of microwave‐assisted green synthesized TiO2 NPs. The photodegradation of the prulifloxacin was not notably influenced by reactive oxygen species. Diverse analytical techniques were utilized to perform the structural analysis of the photoproduct. Results of the proposed investigation indicate that the rate of the photodegradation of prulifloxcin is highest when the drug is irradiated at 310 nm light in the presence of TiO2 NPs.
{"title":"Microwave‐assisted green synthesized TiO2 mediated nano photocatalytic degradation of prulifloxacin: A mechanistic study","authors":"Waseem Ahmad, Anshika Arora, Rinku Rana","doi":"10.1002/vjch.202300257","DOIUrl":"https://doi.org/10.1002/vjch.202300257","url":null,"abstract":"The present investigation reports an effective, environmentally benevolent method for the removal of pharmaceutical waste from the contaminated water. Popular fluoroquinolone antibiotic prulifloxacin residue was taken as a sample of contaminant. Different irradiation conditions were used to explore the ability of TiO2 nanoparticles in the photodegradation of prulifloxacin. Aqueous lichen extract was used to fabricate the TiO2 nanoparticles. The assessment of the physical and chemical properties of the fabricated materials was examined by using well‐established analytical methodologies. The UV–vis spectra depicted the surface plasmon resonance peak at 282 nm. The XRD spectra revealed the particle nature of the developed nanomaterials and the result of the XRD spectrum depicted that the average diameter of the fabricated materials was found to be in the range of 20–30 nm. The FTIR spectra depicted the characteristic band at 750 cm−1, which corresponded to the Ti─O stretching mode of vibration. The SEM micrograph of the developed nanoparticles exhibited the irregular morphology of the developed nanoparticles. The present report critically analyzes the possible route of the degradation of prulifloxacin in the presence of microwave‐assisted green synthesized TiO2 NPs. The photodegradation of the prulifloxacin was not notably influenced by reactive oxygen species. Diverse analytical techniques were utilized to perform the structural analysis of the photoproduct. Results of the proposed investigation indicate that the rate of the photodegradation of prulifloxcin is highest when the drug is irradiated at 310 nm light in the presence of TiO2 NPs.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140685533","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}
Prithivi Rasaili, Summi Rai, KM Sachin, Bidyut Saha, Ajaya Bhattarai
Groundwater is a major source of drinking water for millions of people across the globe. Most of these sources are reported to contain elevated levels of arsenic. Human health and ecosystems are adversely affected by arsenic‐contaminated drinking water. So, arsenic‐contaminated groundwater has become a major global health concern. This paper reviews groundwater contamination sources and gives an outline of arsenic contamination in different places in Nepal. It also critically reviews the health hazards associated with arsenic poisoning. A comparative study has been made regarding different aspects of conventional and recent technologies, and the one that is the most suitable for remediation of contaminated water has been recommended.
{"title":"Arsenic contamination of groundwater sources and a comparative study of its remediation by various conventional and recent approaches in Nepal","authors":"Prithivi Rasaili, Summi Rai, KM Sachin, Bidyut Saha, Ajaya Bhattarai","doi":"10.1002/vjch.202200116","DOIUrl":"https://doi.org/10.1002/vjch.202200116","url":null,"abstract":"Groundwater is a major source of drinking water for millions of people across the globe. Most of these sources are reported to contain elevated levels of arsenic. Human health and ecosystems are adversely affected by arsenic‐contaminated drinking water. So, arsenic‐contaminated groundwater has become a major global health concern. This paper reviews groundwater contamination sources and gives an outline of arsenic contamination in different places in Nepal. It also critically reviews the health hazards associated with arsenic poisoning. A comparative study has been made regarding different aspects of conventional and recent technologies, and the one that is the most suitable for remediation of contaminated water has been recommended.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140685330","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}
Several studies have documented the effective inhibition of genistein, a component in soybeans against α‐glucosidase. However, the details of the inhibition mechanism and kinetics remain unfulfilled. Here, the authors aim to investigate the anti‐diabetic potential of genistein through IC50 value, fluorescence quenching and inhibition kinetics. Genistein was found to exhibit an inhibition activity on α‐glucosidase with an IC50 value of 7.79 ± 0.36 µm. Analysis of fluorescence spectra indicated that genistein quenched enzyme emission through a static mechanism with a bimolecular quenching constant, kq = 4.04 × 1013 m−1 s−1. In addition, it was found that genistein was bound to α‐glucosidase with a high affinity of binding constant, Ka = 3.38 × 105 m−1 and a 1:1 stoichiometric ratio (n = 1.06). In order to suggest a possible contact involved, 8‐anilino‐1‐naphthalenesulfonic acid (ANS) was added as an extrinsic fluorescence probe to enzyme solution and analyzed fluorescence spectra of the α‐glucosidase‐ANS complexes. When treated with genistein, fluorescence intensities of the complexes were reduced remarkably, indicating that genistein interacts with the enzyme via a hydrophobic domain. Finally, the inhibition constant and inhibition mode were studied by inhibition kinetics. The results revealed that genistein bound easily to α‐glucosidase with a Ki value of 25.61 × 10−6 m through a non‐competitive type.
{"title":"Inhibition kinetics and mechanism of genistein against α‐glucosidase","authors":"V. T. Nga, Hoang Minh Hao","doi":"10.1002/vjch.202200173","DOIUrl":"https://doi.org/10.1002/vjch.202200173","url":null,"abstract":"Several studies have documented the effective inhibition of genistein, a component in soybeans against α‐glucosidase. However, the details of the inhibition mechanism and kinetics remain unfulfilled. Here, the authors aim to investigate the anti‐diabetic potential of genistein through IC50 value, fluorescence quenching and inhibition kinetics. Genistein was found to exhibit an inhibition activity on α‐glucosidase with an IC50 value of 7.79 ± 0.36 µm. Analysis of fluorescence spectra indicated that genistein quenched enzyme emission through a static mechanism with a bimolecular quenching constant, kq = 4.04 × 1013 m−1 s−1. In addition, it was found that genistein was bound to α‐glucosidase with a high affinity of binding constant, Ka = 3.38 × 105 m−1 and a 1:1 stoichiometric ratio (n = 1.06). In order to suggest a possible contact involved, 8‐anilino‐1‐naphthalenesulfonic acid (ANS) was added as an extrinsic fluorescence probe to enzyme solution and analyzed fluorescence spectra of the α‐glucosidase‐ANS complexes. When treated with genistein, fluorescence intensities of the complexes were reduced remarkably, indicating that genistein interacts with the enzyme via a hydrophobic domain. Finally, the inhibition constant and inhibition mode were studied by inhibition kinetics. The results revealed that genistein bound easily to α‐glucosidase with a Ki value of 25.61 × 10−6 m through a non‐competitive type.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140684477","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：