Hoang Le Tuan Anh, Ngo Viet Duc, Pham Van Cong, Ngo Van Hieu, Nguyen Van Dan, Vu Thi Trang, Do Thi Thu Hien, D. T. Tuan, Le Tuan Anh, Jeong Ah Kim
Eight compounds, including 20(R)‐ginsenoside Rg3 (1), Ginsenoside Rd (2), ginsenosides Rg2 (3), ginsenosides Re (4), β‐sitosterol (5), daucosterol (6), stigmasterol (7), and stigmasterol‐3‐O‐β‐glucoside (8) were isolated from the Panax ginseng sprouts cultivated in Vietnam. Their structures were elucidated by 1H, 13C NMR, and MS spectroscopic techniques and compared with the previous publication. In addition, their inhibitory activity on NO production and cytotoxic effects against human embryonic kidney cells (HEK‐293A) and human hepatocellular carcinoma (HepG2) were evaluated. This is the first study of the phytochemical investigation of P. ginseng sprouts cultivated in Vietnam and ginseng sprouts also contained the same main active ginsenosides as in the 4–6‐year old roots.
从越南栽培的三七芽中分离出 8 种化合物，包括 20(R)- 人参皂苷 Rg3 (1)、人参皂苷 Rd (2)、人参皂苷 Rg2 (3)、人参皂苷 Re (4)、β-谷甾醇 (5)、龙葵甾醇 (6)、豆甾醇 (7) 和豆甾醇-3-O-β-葡萄糖苷 (8)。通过 1H、13C NMR 和 MS 光谱技术阐明了它们的结构，并与之前发表的文章进行了比较。此外，还评估了它们对 NO 生成的抑制活性以及对人类胚胎肾细胞（HEK-293A）和人类肝细胞癌（HepG2）的细胞毒性作用。这是首次对越南栽培的人参芽进行植物化学研究，人参芽也含有与 4-6 年根相同的主要活性人参皂甙。
{"title":"Chemical constituents of Panax ginseng sprouts cultivated in Vietnam","authors":"Hoang Le Tuan Anh, Ngo Viet Duc, Pham Van Cong, Ngo Van Hieu, Nguyen Van Dan, Vu Thi Trang, Do Thi Thu Hien, D. T. Tuan, Le Tuan Anh, Jeong Ah Kim","doi":"10.1002/vjch.202300181","DOIUrl":"https://doi.org/10.1002/vjch.202300181","url":null,"abstract":"Eight compounds, including 20(R)‐ginsenoside Rg3 (1), Ginsenoside Rd (2), ginsenosides Rg2 (3), ginsenosides Re (4), β‐sitosterol (5), daucosterol (6), stigmasterol (7), and stigmasterol‐3‐O‐β‐glucoside (8) were isolated from the Panax ginseng sprouts cultivated in Vietnam. Their structures were elucidated by 1H, 13C NMR, and MS spectroscopic techniques and compared with the previous publication. In addition, their inhibitory activity on NO production and cytotoxic effects against human embryonic kidney cells (HEK‐293A) and human hepatocellular carcinoma (HepG2) were evaluated. This is the first study of the phytochemical investigation of P. ginseng sprouts cultivated in Vietnam and ginseng sprouts also contained the same main active ginsenosides as in the 4–6‐year old roots.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140430046","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}
SS/PbO2‐TiO2‐SnO2 composite electrode was synthesized by cyclic voltammetry (CV) method. The morphological structure of the composite was studied by scanning electron microscopy (SEM), X‐ray diffraction (XRD), energy dispersive X‐ray spectroscopy (EDX), element‐mapping and thermal gravimetric analysis (TGA). The photoelectrochemical and electrochemical properties were considered in 0.5 m H2SO4 solution with and without UV, respectively. The results indicated that the PbO2‐TiO2‐SnO2 composite had good photoelectrochemical properties due to anodic current and exchange current density increased (31.32% and 48.67%, respectively) under UV irradiation. The composite electrode was used as anode for methyl orange (MO) treatment reached 99.51% under UV irradiation. The kinetic of MO degradation followed the pseudo‐ first order with and without UV (R2 = 0.9528 and 0.9684, respectively). Therefore, TiO2 and SnO2 dopped into PbO2 layer, created a composite with good photoelectrocatalytic activity.
{"title":"Electrochemical degradation of methyl orange from wastewater by SS/PbO2‐TiO2‐SnO2 composite electrode with and without UV","authors":"Pham Thi Tot, Mai Thi Thanh Thuy, Phan Thi Binh","doi":"10.1002/vjch.202300287","DOIUrl":"https://doi.org/10.1002/vjch.202300287","url":null,"abstract":"SS/PbO2‐TiO2‐SnO2 composite electrode was synthesized by cyclic voltammetry (CV) method. The morphological structure of the composite was studied by scanning electron microscopy (SEM), X‐ray diffraction (XRD), energy dispersive X‐ray spectroscopy (EDX), element‐mapping and thermal gravimetric analysis (TGA). The photoelectrochemical and electrochemical properties were considered in 0.5 m H2SO4 solution with and without UV, respectively. The results indicated that the PbO2‐TiO2‐SnO2 composite had good photoelectrochemical properties due to anodic current and exchange current density increased (31.32% and 48.67%, respectively) under UV irradiation. The composite electrode was used as anode for methyl orange (MO) treatment reached 99.51% under UV irradiation. The kinetic of MO degradation followed the pseudo‐ first order with and without UV (R2 = 0.9528 and 0.9684, respectively). Therefore, TiO2 and SnO2 dopped into PbO2 layer, created a composite with good photoelectrocatalytic activity.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140428400","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, the fabrication techniques employed for strain/pressure sensors are covered, highlighting advancements in materials and manufacturing processes. It discusses the use of nanomaterials, such as nanoparticles, nanowires, and graphene to enhance the sensitivity and durability of strain/pressure sensors. Various fabrication methods, including printing, thin‐film deposition, and microelectromechanical systems technologies, are discussed, emphasizing their superiority for strain/pressure sensing applications.
{"title":"Strain/pressure sensors utilizing advanced nanomaterials","authors":"Ly Tan Nhiem, Doan Thi Yen Oanh, N. H. Hieu","doi":"10.1002/vjch.202300236","DOIUrl":"https://doi.org/10.1002/vjch.202300236","url":null,"abstract":"In this study, the fabrication techniques employed for strain/pressure sensors are covered, highlighting advancements in materials and manufacturing processes. It discusses the use of nanomaterials, such as nanoparticles, nanowires, and graphene to enhance the sensitivity and durability of strain/pressure sensors. Various fabrication methods, including printing, thin‐film deposition, and microelectromechanical systems technologies, are discussed, emphasizing their superiority for strain/pressure sensing applications.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140433774","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. N. Tam, Huynh Nguyen Que Anh, D. Khue, Phan Thuy Xuan Uyen, Van Hong Thien, Nguyen Thi Huong, Pham Minh Tuan, Tran Thien An
The quality of Pacific white shrimp stored at 0 °C during the 10 days was evaluated by the combination of sensory, microbiological and biochemical measurements. Quality index methods (QIM) have been developed to evaluate sensory attributes of shrimp. Total visible count (TVC), K value, histamine, and pH are used to assess microbiological and biochemical indices. The results of TVC and QIM showed that shrimps showed signs of spoilage (lg cfu = 6.4; quality index (QI) = 21.37), which is unacceptable to consumers on day 9. QI quality score increased linearly with storage days. The remaining shelf life of shrimp was estimated from the linear regression equation. The results have found the linear regression equations between the QI, histamine, K value, and hypoxanthine. In addition, the results also showed that hypoxanthine could be considered as an independent quality index such as the K index. The quality of Pacific white shrimp could be classified into four grades: excellent, good, moderately acceptable, and just acceptable basing on the results of sensory and biochemical evaluation.
通过感官、微生物和生化测量相结合的方法，对在 0 °C 下储存 10 天的太平洋南美白对虾的质量进行了评估。已开发出质量指数法（QIM）来评估虾的感官属性。可见总计数（TVC）、K 值、组胺和 pH 值用于评估微生物和生化指标。可见总计数（TVC）和质量指数（QI）的结果表明，虾在第 9 天出现了腐败迹象（lg cfu = 6.4；质量指数（QI）= 21.37），消费者无法接受。QI 质量得分随着储存天数的增加呈线性增长。根据线性回归方程估算了虾的剩余保质期。结果发现，QI、组胺、K 值和次黄嘌呤之间存在线性回归方程。此外，研究结果还表明，次黄嘌呤可被视为一个独立的质量指标，如 K 指数。根据感官和生化评价结果，太平洋南美白对虾的质量可分为四个等级：优、良、中等可接受和可接受。
{"title":"Improving the quality assessment for Pacific white shrimp (Litopenaeus vannamei) stored at 0 °C","authors":"L. N. Tam, Huynh Nguyen Que Anh, D. Khue, Phan Thuy Xuan Uyen, Van Hong Thien, Nguyen Thi Huong, Pham Minh Tuan, Tran Thien An","doi":"10.1002/vjch.202300175","DOIUrl":"https://doi.org/10.1002/vjch.202300175","url":null,"abstract":"The quality of Pacific white shrimp stored at 0 °C during the 10 days was evaluated by the combination of sensory, microbiological and biochemical measurements. Quality index methods (QIM) have been developed to evaluate sensory attributes of shrimp. Total visible count (TVC), K value, histamine, and pH are used to assess microbiological and biochemical indices. The results of TVC and QIM showed that shrimps showed signs of spoilage (lg cfu = 6.4; quality index (QI) = 21.37), which is unacceptable to consumers on day 9. QI quality score increased linearly with storage days. The remaining shelf life of shrimp was estimated from the linear regression equation. The results have found the linear regression equations between the QI, histamine, K value, and hypoxanthine. In addition, the results also showed that hypoxanthine could be considered as an independent quality index such as the K index. The quality of Pacific white shrimp could be classified into four grades: excellent, good, moderately acceptable, and just acceptable basing on the results of sensory and biochemical evaluation.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140436757","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. T. Nguyen, Tien A. Nguyen, Kwangsoo No, Tuan D. Phan
This study aims to improve the antibacterial effectiveness against Streptococcus mutans (S. mutans) of Ti6Al4V alloy by employing functional Ag coating on the alloy's surface. In this study, Ag coating was prepared on Ti6Al4V surface via RF magnetron sputtering, then investigated characteristics and anti‐S. mutans properties of the modified surface's alloy before and after immersing in simulated body fluid (SBF) solution for one month. Data showed that the two coatings inhibited the development of S. mutans colony‐forming units (CFU) at an incubation time until seven days. This study provides a research foundation for further development of surface modification of Ti6Al4V alloy for dental implants to meet the demand of reducing peri‐implant diseases caused by bacteria.
本研究旨在通过在 Ti6Al4V 合金表面使用功能性 Ag 涂层来提高其对变异链球菌（S. mutans）的抗菌效果。本研究通过射频磁控溅射在 Ti6Al4V 表面制备了 Ag 涂层，然后研究了将改性后的合金表面在模拟体液（SBF）溶液中浸泡一个月前后的特性和抗变异性链球菌的性能。数据显示，这两种涂层在培养至七天时都能抑制变异杆菌菌落形成单位（CFU）的发展。这项研究为进一步开发牙科种植体用 Ti6Al4V 合金的表面改性提供了研究基础，以满足减少由细菌引起的种植体周围疾病的需求。
{"title":"Surface modification of Ti6Al4V alloy: A case study on anti‐Streptococcus mutans","authors":"L. T. Nguyen, Tien A. Nguyen, Kwangsoo No, Tuan D. Phan","doi":"10.1002/vjch.202300171","DOIUrl":"https://doi.org/10.1002/vjch.202300171","url":null,"abstract":"This study aims to improve the antibacterial effectiveness against Streptococcus mutans (S. mutans) of Ti6Al4V alloy by employing functional Ag coating on the alloy's surface. In this study, Ag coating was prepared on Ti6Al4V surface via RF magnetron sputtering, then investigated characteristics and anti‐S. mutans properties of the modified surface's alloy before and after immersing in simulated body fluid (SBF) solution for one month. Data showed that the two coatings inhibited the development of S. mutans colony‐forming units (CFU) at an incubation time until seven days. This study provides a research foundation for further development of surface modification of Ti6Al4V alloy for dental implants to meet the demand of reducing peri‐implant diseases caused by bacteria.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140437496","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}
Anh Tuan Tran, Ha Manh Nguyen, Quan Tran Dang, L. T. Duong, Dang Thanh Pham, Bac Quang Nguyen
This study investigated the geochemical background values for seven trace elements in topsoil samples collected from highland areas within Cao Bang province, Vietnam. Total concentrations of these elements were determined, revealing the following order of mean concentration: Zn > Cr > Pb > Cu > As > Ni > Co. The background values were calculated using two different methods including iterative 2δ‐technique and 4δ‐outlier test. The 4δ‐outlier test yielded the following background concentrations (dry weight) for the seven elements: As (24.41 ± 12.42 mg kg−1), Co (15.64 ± 10.57 mg kg−1), Cr (49.31 ± 33.41 mg kg−1), Cu (29.77 ± 27.14 mg kg−1), Ni (22.52 ± 13.33 mg kg−1), Pb (38.06 ± 31.48 mg kg−1), Zn (71.79 61.09 mg kg−1). The 2δ‐technique, on the other hand, resulted in the following background concentrations (dry weight) for the same elements: As (8.41 ± 8.57 mg kg−1), Co (5.06 ± 4.31 mg kg−1), Cr (26.72 ± 26.20 mg kg−1), Cu (25.31 ± 24.81 mg kg−1), Ni (8.02 ± 7.83 mg kg−1), Pb (28.12 ± 27.58 mg kg−1), Zn (51.91 ± 49.44 mg kg−1). These results provide valuable baseline data for future environmental assessments and monitoring programs in the region. They also highlight the potential impact of human activities, such as mining, on the geochemical landscape of highland areas.
{"title":"Using iterative 2δ‐technique and 4δ‐outlier test for evaluating the geochemical background concentrations of trace elements in topsoil at Cao Bang province, Vietnam","authors":"Anh Tuan Tran, Ha Manh Nguyen, Quan Tran Dang, L. T. Duong, Dang Thanh Pham, Bac Quang Nguyen","doi":"10.1002/vjch.202300400","DOIUrl":"https://doi.org/10.1002/vjch.202300400","url":null,"abstract":"This study investigated the geochemical background values for seven trace elements in topsoil samples collected from highland areas within Cao Bang province, Vietnam. Total concentrations of these elements were determined, revealing the following order of mean concentration: Zn > Cr > Pb > Cu > As > Ni > Co. The background values were calculated using two different methods including iterative 2δ‐technique and 4δ‐outlier test. The 4δ‐outlier test yielded the following background concentrations (dry weight) for the seven elements: As (24.41 ± 12.42 mg kg−1), Co (15.64 ± 10.57 mg kg−1), Cr (49.31 ± 33.41 mg kg−1), Cu (29.77 ± 27.14 mg kg−1), Ni (22.52 ± 13.33 mg kg−1), Pb (38.06 ± 31.48 mg kg−1), Zn (71.79 61.09 mg kg−1). The 2δ‐technique, on the other hand, resulted in the following background concentrations (dry weight) for the same elements: As (8.41 ± 8.57 mg kg−1), Co (5.06 ± 4.31 mg kg−1), Cr (26.72 ± 26.20 mg kg−1), Cu (25.31 ± 24.81 mg kg−1), Ni (8.02 ± 7.83 mg kg−1), Pb (28.12 ± 27.58 mg kg−1), Zn (51.91 ± 49.44 mg kg−1). These results provide valuable baseline data for future environmental assessments and monitoring programs in the region. They also highlight the potential impact of human activities, such as mining, on the geochemical landscape of highland areas.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140448703","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 growing study of polymer composites has motivated scientists to explore more methodologies to enhance the final demanding properties of polymer composites. Polymer composites have commonly been fabricated using thermosets or thermoplastics with synthetic or natural fillers. Lately, ionic liquids have been applied as coupling agents for polymer composites. In this succinct review, two types of ionic liquids, specifically imidazolium‐ and phosphonium‐based ionic liquids that are applied as coupling agents, are identified. Additionally, the synthesis of ionic liquids with different precursors and reactions is explained. The coupling effect of ionic liquids on the mechanical, thermal, and chemical properties of polymer composites is also succinctly reviewed. The knowledge shown in this review gives a more transparent comprehension of the fabrication of polymer composites coupled with ionic liquids and the essential properties of polymer composites. In conclusion, most imidazolium‐ and phosphonium‐based ionic liquids can improve several mechanical, thermal, and chemical properties of thermoset and thermoplastic composites.
{"title":"Coupling effect of ionic liquids on the mechanical, thermal, and chemical properties of polymer composites: A succinct review","authors":"A. A. Shamsuri, S. N. A. Md. Jamil, K. Abdan","doi":"10.1002/vjch.202300134","DOIUrl":"https://doi.org/10.1002/vjch.202300134","url":null,"abstract":"The growing study of polymer composites has motivated scientists to explore more methodologies to enhance the final demanding properties of polymer composites. Polymer composites have commonly been fabricated using thermosets or thermoplastics with synthetic or natural fillers. Lately, ionic liquids have been applied as coupling agents for polymer composites. In this succinct review, two types of ionic liquids, specifically imidazolium‐ and phosphonium‐based ionic liquids that are applied as coupling agents, are identified. Additionally, the synthesis of ionic liquids with different precursors and reactions is explained. The coupling effect of ionic liquids on the mechanical, thermal, and chemical properties of polymer composites is also succinctly reviewed. The knowledge shown in this review gives a more transparent comprehension of the fabrication of polymer composites coupled with ionic liquids and the essential properties of polymer composites. In conclusion, most imidazolium‐ and phosphonium‐based ionic liquids can improve several mechanical, thermal, and chemical properties of thermoset and thermoplastic composites.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140456756","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}
A. K. Behera, S. S. Pattnaik, Chirasmayee Mohanty, Rohit Srivastav, Jyotsnarani Pradhan
The need of the hour is for the creation of natural fiber‐based, biodegradable cutlery in order to protect our planet from pollution caused by plastic. Soy resin creates a hard eco‐friendly/biodegradable composite when combined with phenol‐formaldehyde/resole and a natural fiber like jute. In this experiment, soy and other ingredients are combined with various weight percentages of resoles. Jute‐modified soy composites are characterized through Fourier transform infra‐red spectroscopy, mechanical testing and found maximum tensile strength of 46.62 MPa. After 8 weeks of microbial degradation testing on the generated composites, it is discovered that the mechanically optimized composite lost only 17.7% of its initial weight. Cutlery pieces are molded using the jute‐soy/jute‐resole modified soy composition, and cytotoxicity testing has shown that they are non‐toxic. Because they are non‐toxic and biodegradable, these composites can be used as a substitute to non‐biodegradable plastic in a range of industries.
{"title":"Mechanical and cytotoxic analysis of cutlery developed from phenol‐formaldehyde modified soy‐jute composite","authors":"A. K. Behera, S. S. Pattnaik, Chirasmayee Mohanty, Rohit Srivastav, Jyotsnarani Pradhan","doi":"10.1002/vjch.202200162","DOIUrl":"https://doi.org/10.1002/vjch.202200162","url":null,"abstract":"The need of the hour is for the creation of natural fiber‐based, biodegradable cutlery in order to protect our planet from pollution caused by plastic. Soy resin creates a hard eco‐friendly/biodegradable composite when combined with phenol‐formaldehyde/resole and a natural fiber like jute. In this experiment, soy and other ingredients are combined with various weight percentages of resoles. Jute‐modified soy composites are characterized through Fourier transform infra‐red spectroscopy, mechanical testing and found maximum tensile strength of 46.62 MPa. After 8 weeks of microbial degradation testing on the generated composites, it is discovered that the mechanically optimized composite lost only 17.7% of its initial weight. Cutlery pieces are molded using the jute‐soy/jute‐resole modified soy composition, and cytotoxicity testing has shown that they are non‐toxic. Because they are non‐toxic and biodegradable, these composites can be used as a substitute to non‐biodegradable plastic in a range of industries.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140456769","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}
Mehdi Hosseinzadeh, Saber Ghasemi Karaj‐Abad, Mojtaba Abbasian, Mehdi Bagharaie Azar
In this study, cellulose was first treated with 4‐cyano‐4‐((phenyl carbonothioyl)solfanyl) pentanoic acid to serve as the reversible addition‐fragmentation chain transfer polymerization (RAFT) agent, then the controlled grafting polymerization of acrylic acid was successfully performed. A well‐defined, cellulose‐graft‐acrylic acid copolymer (Cell‐g‐PAA), has been prepared by RAFT polymerization technique using three different approaches: RAFT agent was prepared by substitution of dithiobenzoate magnesium bromide with 4,4'‐azobis(4‐cyanopentanoic acid) in ethyl acetate as a solvent, mediated cellulose (Cell) block as the macromolecular Cell‐ RAFT agent and (cellulose‐co‐acrylic acid) copolymer with alternating sequence. The resulting (Cell‐RAFT) for “living” free radical polymerization was then heated in the adjacent acrylic acid monomer for the development of the controlled graft copolymer onto cellulose. The structures of the intermediate, graft copolymer were investigated by FT‐IR, DSC, 1H NMR, scanning electron microscopy, and thermo gravimetric. The results demonstrate that the preparation of graft copolymers was successfully confirmed. This approach would provide an extensive classification of molecular designs to obtain modern types of tailored hybrid materials derived from natural polysaccharides and synthetic polymers. Also, using a macro‐initiator is an excellent method for synthesizing new materials.
{"title":"A new method for synthesis of modified cellulose‐graft‐poly(acrylic acid) copolymer using 4‐cyano‐4‐[(phenylcarbothioyl)solfanyl]pentanoic acid to serve as RAFT agent","authors":"Mehdi Hosseinzadeh, Saber Ghasemi Karaj‐Abad, Mojtaba Abbasian, Mehdi Bagharaie Azar","doi":"10.1002/vjch.202300016","DOIUrl":"https://doi.org/10.1002/vjch.202300016","url":null,"abstract":"In this study, cellulose was first treated with 4‐cyano‐4‐((phenyl carbonothioyl)solfanyl) pentanoic acid to serve as the reversible addition‐fragmentation chain transfer polymerization (RAFT) agent, then the controlled grafting polymerization of acrylic acid was successfully performed. A well‐defined, cellulose‐graft‐acrylic acid copolymer (Cell‐g‐PAA), has been prepared by RAFT polymerization technique using three different approaches: RAFT agent was prepared by substitution of dithiobenzoate magnesium bromide with 4,4'‐azobis(4‐cyanopentanoic acid) in ethyl acetate as a solvent, mediated cellulose (Cell) block as the macromolecular Cell‐ RAFT agent and (cellulose‐co‐acrylic acid) copolymer with alternating sequence. The resulting (Cell‐RAFT) for “living” free radical polymerization was then heated in the adjacent acrylic acid monomer for the development of the controlled graft copolymer onto cellulose. The structures of the intermediate, graft copolymer were investigated by FT‐IR, DSC, 1H NMR, scanning electron microscopy, and thermo gravimetric. The results demonstrate that the preparation of graft copolymers was successfully confirmed. This approach would provide an extensive classification of molecular designs to obtain modern types of tailored hybrid materials derived from natural polysaccharides and synthetic polymers. Also, using a macro‐initiator is an excellent method for synthesizing new materials.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140456891","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 Thi Thanh Nhi, Le Thi Hoa, Dam To Uyen, Le Hoang Sinh, D. Nguyen, Ta Ngoc Bach, Tran Thanh Tam Toan, Dinh Quang Khieu
The synthesis of the UiO‐66/rGO material involved combining UiO‐66 with reduced graphene oxide (rGO). This resulting composite found application in the electrochemical determination of salbutamol (SAL) through modification of a glassy‐carbon electrode (GCE) with UiO‐66/rGO. Differential pulse voltammetry served as the chosen technique, offering a wide linear range spanning 1–160 µm and demonstrating a low limit of detection at 0.84 µm. To ensure the reliability of the electrode, various aspects such as sensitivity, repeatability, reproducibility, and stability were meticulously studied. When applied to the analysis of SAL in swine urine solutions (n = 3), the electrode exhibited good recovery rates. Remarkably, the results obtained through this method correlated well with those acquired using ultra‐high performance liquid chromatography (UPLC).
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