bluuebunny/crossref_metadata_2025_split huggingface dataset:
Screening of several oxides used as efficient electrocatalysists for detection of 2,4‐dimethyl phenol in aqueous medium
Authors: Nhung Vu Thi Hong , Manh Nguyen Ba , Thu Vu Thi , Yen Pham Thi Hai , Giang Le Ha , Phong Pham Hong , Tuan Vu Anh , Ha Vu Thi Thu 
Published: March 2024

AbstractA paste electrochemical sensor, based on a carbon paste electrode modified with different oxides, has been developed for investigation of 2,4‐dimethylphenol (2,4 DMP) oxidation in phosphate buffer solution (PBS) with pH of 7. In this study, Fe2O3, Al2O3, ZrO2 and SiO2 have been tested. Among these oxides, Al2O3 showed the best electrocatalysis on oxidation of 2,4 DMP at ratio of graphite powder/Al2O3/paraffin oil = 71/4/25. The high sensibility of Al2O3 for 2,4 DMP detection can be explained by the interaction between benzene rings of phenol and acid sites of Al2O3. From this result it opens a high potential application of sensors based on the electro acidic catalysts.
Sweet switching: Development of photoswitchable glycoconjugates ‐ Mini‐Review
Authors: Maisonneuve Stéphane , Lin Chaoqi , Xie Juan 
Published: March 2024

AbstractPhotochromism, a reversible photo‐induced transformation of a molecule between two isomers having distinguishably different absorption spectra, has found increasing applications in materials science, chemistry, biology and pharmacology. In this review, we summarize our recent efforts on the development of photoswitchable carbohydrates and their conjugates. Synthesis, photophysical properties and potential applications of azobenzene‐functionalized glycomacrolactones and glycolipids, as well as multichromophoric sugar bearing diarylethene photochrome and dicyanomethylene‐4H‐pyran fluorophore will be discussed and compared.
Norlignans from the aerial parts of Pouzolzia sanguinea
Authors: Nhung Le Thi Hong , Hoang Nguyen Huy , Tai Bui Huu , Nhiem Nguyen Xuan , Van Kiem Phan 
Published: March 2024

AbstractFive norlignans, gnetifolin F (1), pouzolignan F (2), pouzolignan G (3), pouzolignan H (4), and pouzolignan L (5) were isolated from the aerial parts of Pouzolzia sanguinea leaves. Their chemical structures were determined using NMR spectra and in comparison with the reported literature. Compound 1 was reported from Pouzolzia genus for the first time.
Effect of epoxydized carbon nanotube master batch on polypropylene film properties
Authors: Van Khoi Nguyen , Thang Trang Vu , Phuong Hoang Thi 
Published: March 2024

AbstractFirst, the surface of carbon nanotubes (CNTs) was modified by epoxidation reaction to create epoxidized CNTs (O<CNTs). Following step, master batches of O<CNTs (MB‐O<CNTs) with different O<CNTs contents (5‐12 wt%) were prepared by melt mixing in the presence of anhydride grafted polypropylene (PPgMAH). The CNTs content dispersed uniformly in master batch is 7 wt%. Finally, the effect of MB‐O<CNTs contents on some properties of polypropylene film (PP film) was studied. The PP film samples with different MB‐O<CNTs content (such that the O<CNTs content in the film varies from 0‐1.0 wt%) were prepared on film blowing extruder. The effects of O<CNTs contents on the mechanical, thermal and electrical properties of PP film samples were investigated. The study found that tensile strength of PP films increased significantly with increasing O<CNTs content while elongation at break decreased. In addition, the presence of O<CNTs slightly increased the degree of crystallization and crystallization temperature of PP films while the melting behavior did not change much. From FE‐SEM analysis, the good dispersion of O<CNTs in the PP films was obtained from PP films with O<CNTs content in the range of 0.2‐0.8 wt%. The presence of O<CNTs also changed the electrical properties of PP. The PP films were achieved the antistatic effect at O<CNTs content in the range of 0.2‐0.4 wt%. In addition, the results showed that the master batch processing helps O<CNTs to disperse more evenly in the PP film.
Investigation of acute toxicity of composite Cu2O NPs/Diatomite on white mice
Authors: Nga Dinh Thi , Nhung Dang Thi Thuy , Ngoc Tran Thi Thanh , Tuan Phan Dinh , Hien Nguyen Quoc 
Published: March 2024

AbstractCu2O NPs/diatomite is a composite material synthesized by chemical reduction method of Cu2+ ion adsorbed on diatomite. Cu2O NPs/diatomite is capable of adsorption of pollutants and microbial treatment, for aquaculture water treatment applications. The study focused on the acute toxicity determination of Cu2O NPs/diatomite material on Swiss white mice by oral tests. The results showed that Cu2O NPs/diatomite was almost non‐toxic with a test dose of 2,000 mg/kg of mice body weight, LD50 could not be determined. Monitoring the mice's activity after 14 days, the mice have normal activities, normal stool, urine, pink mucosa, smooth feather, good reflexes. Thus, with the very low acute toxicity on white mice, Cu2O NPs/diatomite was evaluated a good candidate for aquaculture treatment application.
Study on the interaction of K[PtCl3(L)] (L: safrole, methyleugenol, isopropyl eugenoxyacetate and piperidine)] with some heterocyclic bidentate amines
Authors: Chi Nguyen Thi Thanh 
Published: March 2024

AbstractThe interactions between K[PtCl3(L)] (L: safrole/1a, methyleugenol/1b, isopropyl eugenoxyacetate/1c, piperidine/1d) and heterocyclic bidentate amines (1,10‐phenalthroline/Phen, 2,2’‐bipyridine/Bpy, 4,4’‐dimethyl‐2,2’‐bipyridine/MeBpy, and 8‐aminoquinoline/NH2Q) were investigated for the first time. The results show that the amines readily replace the L ligand, the arylolefin or piperidine, to form complexes of the formula cis‐[PtCl2(amine)] (amine: Phen/2, Bpy/3, MeBpy/4 and NH2Q/5) in very high yields (90‐95 %). The structures of 2‐5 were analyzed by Pt percentage, IR spectroscopy, and also by ESI‐MS, 1H NMR spectroscopy for 5. The result of testing in vitro cytotoxicity of complex 5 against Hep G2, RD, MCF‐7 and Fl human cancer cell lines indicates that complex 5 exhibits greater activity against RD cell line in comparison to cisplatin with IC50 value of 6.96 μg/ml.
The promotion effect of iron to Cu/ZSM‐5 catalyst for NOx removal by NH3‐SCR
Authors: Doan Tuan , Dang Anh , Nguyen Dat , Tran The , Vuong Thanh Huyen , Le Minh Thang , Pham Thanh Huyen 
Published: March 2024

AbstractThe Cu/ZSM‐5 and Cu‐Fe/ZSM‐5 catalysts (ZSM‐5 with Si:Al ratio of 25:1) were created utilizing the liquid ion‐exchange technique. The effects of Fe on the physical and chemical characteristics of Cu/ZSM‐5 catalysts were investigated using X‐ray diffraction, field‐emission scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, nitrogen adsorption/desorption, and temperature‐programmed ammonia desorption. The coordination and valence state of copper and iron elements at intersections or in channels of ZSM‐5 was determined by the electron paramagnetic resonance technique. The effects of metal doping on the structure and catalytic activity of all catalysts were comprehensively investigated for NOx removal utilizing selective catalytic reduction with ammonia (NH3‐SCR). The results indicated that the promotion of iron significantly increased the NOx conversion and N2 selectivity of the Cu/ZSM‐5 catalyst for NH3‐SCR in the temperature range from 200 to 600 °C, and catalysts were highly resistant to high space velocity. This article describes a simple and uncomplicated method for synthesizing the commercially viable catalyst used in NH3‐SCR technology to reduce NOx emissions.
Study on some characteristics of fish scale collagen modified by UV irradiation
Authors: Dan Pham The , Hoang Thai , Chinh Nguyen Thuy , My Do Thi , Thang Dam Xuan , Trung Vu Quoc 
Published: March 2024

AbstractCollagen is a structural protein composed of three α‐chains wound together in a tight triple helix, occurring abundantly in the skin and connective tissues of mammals, as well as other clades of the animal kingdom. Many studies have demonstrated that collagen has good biocompatibility and contains essential amino acids of great value to the medical and pharmaceutical industry. In this study, collagen was extracted from common carp (Cyprinus carpio) scales and physically modified by UV irradiation. Methods of IR, HPLC and FESEM analysis were used for determination of functional group, chemical composition and morphological changes of modified collagen samples. The denaturation temperature of collagen samples was determined based on the change in relative viscosity of collagen solution as increasing temperature from 10 oC to 50 oC. Finally, hemostatic activity of the modified collagen samples was assessed in vitro. The obtained results showed that UV‐treatment of collagen led to significant changes in its properties. After UV treatment, the thermal stability and hemostatic ability of modified collagen samples was improved. Overall, total irradiation duration of 3.6s to 6s was adequate, and produced collagen samples with improved thermal stability and hemostatic activity.
Prediction of tensile strength of combine aged natural rubber/chloroprene rubber (NR/CR) blends using experimental statistical model
Authors: Hung Dang Viet , Quang Nguyen Trong , Tung Nguyen Huy , Linh Nguyen Pham Duy , Hai Pham Hong , Chuong Bui 
Published: March 2024

AbstractFor prediction of tensile strength of combine aged NR/CR blends, samples with NR/CR ratios of 100/0, 95/5 and 90/10 were subjected heat aging at various temperatures, namely 100, 110 and 120°C, each for 22 h, followed by dynamic tensile loadings to 140 % and frequency 300 cycles/min. Then the tensile strengths of aged samples were defined. Based on obtained experimentally values the experimental statistical model was built using FORTRAN language. The model result in prediction equation for tensile strength of NR and NR/CR blends with low CR (not higher 10 %) contents. This equation seems to have fine usability, having relative error between calculated and experimentally defined values of tensile strength less than 10 % in the considered range of experiments.
Theoretical study on inhibitability of some natural alkaloids against influenza virus hemagglutinin and SARS‐CoV‐2 main protease
Authors: Bui Thanh Q. , Hai Nguyen Thi Thanh , Van Chen Tran , Quy Phan Tu , Du Ly Nguyen Hai , Cuong To Dao , Triet Nguyen Thanh , Thuy Nguyen Thi Thu , Nhung Nguyen Thi Ai 
Published: March 2024

AbstractBerberine (V1), lycorine (V2), hemanthamine (V3), aloperin (V4), dendrobine (V5) possess structural frameworks resembling known anti‐influenza and anti‐SARS‐CoV‐2 drugs, thus subjected for a computational screening. Their quantum properties were examined using density functional theory (DFT); the ligand‐protein inhibitability was evaluated using molecular docking simulation; physicochemical properties were obtained from QSARIS‐based analysis in reference to Lipinski's rule of five; pharmacokinetic parameters were assessed by ADMET‐based analysis. DFT calculations indicate that there are no abnormal bonding constraints observed; NBO analysis suggests all possessing favorable electric configurations for intermolecular inhibition. Regarding ligand‐2VIU, the order for static inhibitability is V3‐2VIU > V2‐2VIU > V1‐2VIU > V5‐2VIU > V4‐2VIU; Regarding ligand‐6LU7, the corresponding order follows: V2‐6LU7 > V3‐6LU7 > V1‐6LU7 > V5‐6LU7 > V4‐6LU7. An exceptional hydrophilic bonding (π‐cation) with the associated Gibbs free energy of ‐10.9 kcal.mol‐1 is detected in inhibitory complex V1‐2VIU. QSARIS‐based analysis reveals that all the candidates are highly bio‐compatible. ADMET‐based analysis specifies V2 and V3 as being safe and suitable for the use as orally administrated drugs. The results encourage further investigations for more in‐depth mechanisms and experimental validations, such as molecular dynamics simulation and in vitro enzyme assays.
Silver nanoparticles decorated a hybrid of PANI/MoS2 and PANI/WO3 as potential catalysts for direct photoelectrochemical oxidation of glucose
Authors: Thu Nguyen Minh , Van Tuan Dinh , Ngan Dang Thi Thuy , Nam Pham Hong , Van Quynh Nguyen 
Published: March 2024

AbstractThis paper presents an effective electrodeposition method for generating hybrid material based on polyaniline (PANI), n‐type semiconductor (MoS2/WO3), and silver nanoparticle (AgNPs) which can trigger direct oxidation glucose in solution without an enzyme catalyst. To do so, the working electrode surface is firstly electrochemically modified by the PANI layers decorated with MoS2 and/or WO3, then electrodeposition of AgNPs on the as‐prepared electrode is carried out subsequently. The addition of WO3 and/or MoS2 and AgNPs to PANI matrix improves interfacial charge transfer efficiency. Especially, under light irradiation, the synergistic effect of n‐type semiconductor and AgNPs into the PANI matrix prompted its higher electrocatalytic activity which is exploited for direct oxidation of glucose in solution without the presence of any enzyme. This strategical approach reveals a promising manner for generating non‐enzymatic glucose electrochemical sensors upon laser excitation.
UV‐curing of coatings based on black seed oil modified epoxy resin
Authors: Hien Le Xuan , Thanh Do Minh , Duc Nguyen Minh 
Published: March 2024

AbstractUV‐curing of the coatings based on epoxy resin modified by black seed oil (EBSO); 3,4‐epoxycyclohexylmethyl 3,4‐epoxycyclohexane carboxylate ‐ a biscycloaliphatic diepoxide (BCDE) and photoinitiator triarylsulfonium hexafluoroantimonate salts (TAS) with various EBSO/BCDE weight ratios have been investigated. The variation of TAS and functional groups in the coatings like epoxy, hydroxyl, ether during the curing was followed by IR‐spectrometric analysis. The performance of the cured coatings has been determined. It was showed that increase of the EBSO/BCDE weight ratio from 20/80 to 80/20 led to changes both photocrosslinking and properties of investigated coatings: Consumption of total epoxy groups from 4.62 to 0.77 mole/kg, gel fraction from 76.9 % to 73.25 %, swelling degree from 235 % to 559 %, relative hardness from 0.84 to 0.16, flexibility from 10 to 1 mm, impact resistance from 5 to 60 kG.cm while gloss at 60o remained to be 100 % after 1.2s of UV‐ exposure.
DPPH radical scavenging of G&A‐MI Maillard intermediates (alpha‐D‐Glucopyranose/alpha‐L‐Alanine) improved by ZSM‐5
Authors: Long Huang , Jing Zhang , Man Xiong , Xuan Bie , Yawei Dong , Ben Wang , Yikun Chen , Ronghua Huang 
Published: March 2024

AbstractThis paper prepared alpha‐D‐glucopryanose/alpha‐L‐Alanine Maillard intermediates in acid or basic catalyst (labelled as G&A‐MIa and G&A‐MIb) with different molecular weights. ZSM‐5 greatly affected their pyrolysis behaviors. After ZSM‐5 added, the endothermal or mass loss peaks for both G&A‐MIa and G&A‐MIb decreased to lower temperature with different extents. For an instance, endothermal peaks of G&A‐MIb‐2000 at 647°C decreased to 614°C, and its mass loss peak at 167.3°C decreased to 147.0°C. Their pyrolysis under N2 atmosphere or 90%N2 + 10%O2 presented that additional of ZSM‐5 obviously enhanced the generation of volatiles, especially 4H‐Pyran‐4‐one, 2,3‐dihydr o‐3,5‐dihydroxy‐6‐methyl (PODDM). We assigned the ZSM‐5 influence to its sensitivity on C‐N and C‐O bonds among MIs. DPPH (1,1‐diphenyl‐2‐picrylhydrazyl) radical scavenging by volatile absorption solution confirmed that ZSM‐5 obviously improved the antioxidant activity. This would be good news because application of ceramic cookers contains similar components to ZSM‐5.
Low‐lying states of FeSin−/0/+ (n = 1‐2) clusters from DMRG‐CASPT2 calculations
Authors: Van Tan Tran , Tri Tran Quoc , Cang Phan Trung , Hanh Nguyen Thi Hong , Linh Ho Sy , Tan Nguyen Phu , Hendrickx Marc F.A. 
Published: March 2024

AbstractThe electronic states of FeSin−/0/+ (n = 1‐2) clusters have been investigated with DFT, CASPT2, and DMRG‐CASPT2 methods. By using relatively large active spaces, the DMRG‐CASPT2 method is found to provide highly accurate relative energies for the various relevant electronic states. Leading configurations, bond distances, harmonic vibrational frequencies, and relative energies for the low‐lying states of the title clusters are reported. Electron detachment energies for the ground states of the anionic and neutral clusters were estimated at the DMRG‐CASPT2 level. Franck‐Condon factor simulations were performed for transitions from the anionic ground state to the neutral ground state and from the neutral ground state to the cationic ground state with the purpose to produce the vibrational progressions.
Predicting composition of combustion products of the pyrotechnic based on Magnesium‐Teflon‐Viton
Authors: Son Nguyen Nam , Sang Dam Quang , Van Tinh Nguyen 
Published: March 2024

AbstractDetermining the equilibrium composition of combustion products is important in studying high‐energetic materials such as explosives, propellants, and pyrotechnics. This paper presents a theoretical method and computer program named CAL to predict the composition of combustion products of pyrotechnic mixture based on Magnesium‐Teflon‐Viton by the Gibbs free energy minimization principle. Computer program CAL was developed using the fmincon tool in MATLAB. The reliability of CAL was confirmed when comparing its calculation results with ones obtained by other software and experimental data.
Evaluation of the effect of the chitosan/carrageenan ratio on lovastatin release from chitosan/carrageenan based biomaterials
Authors: Hung Ha Manh , Manh Vu Quoc , Thao Vu Thi Thu , Thuy Dao Thi Phuong , Dung Pham Tien , Viet Nguyen Thi Bich , Linh Duong Khanh , Linh Nguyen Ngoc , Oanh Doan Thi Yen , Chinh Nguyen Thuy , Hoang Thai , Trung Vu Quoc 
Published: March 2024

AbstractThe chitosan/carrageenan/lovastatin biomaterials were prepared using a solution technique with 5 % lovastatin and a variable chitosan/carrageenan mass ratio. Fourier transform infrared spectroscopy (FT‐IR) and field emission scanning electron microscopy (FESEM) images revealed that the complex's components were well dispersed into each other without changing the chemical structure, forming dipole interactions and hydrogen bonds among them. The abilities to release Lovastatin (Lov) in pH 2 and pH 7.4 solutions, corresponding to the environments in stomach and intestinal fluids, respectively, are both affected by the ratio of polymer components. The best results were obtained with the chitosan/carrageenan/lovastatin (w/w/%w = 10/90/5%) (CsCL195) biomaterial sample in which the particles are evenly dispersed. While the drug release process was poor in the pH 2 solution (gastric juice), a good release observed in the pH 7.4 solution (intestinal fluid) allows facilitating drug absorption through the intestinal mucosa cells into the blood, from which the effects of hypercholesterolemia treatment can be obtained.
Synthesis, structure and anticancer activities of Cd(II), Cu(II) and Pd(II) complexes with 5,7‐dichloro‐8‐hydroxylquinoline‐2‐carboxaldehyde‐4‐chloro‐2‐aminothiophenol
Authors: Duong Hoang Tuan , Giang Ninh Thi Minh , Ngoc Nguyen Thi Bich , Hai Le Thi Hong 
Published: March 2024

AbstractThree new complexes of Cd(II), Cu(II) and Pd(II) with 5,7‐dichloro‐8‐hydroxyquinoline‐2‐carboxaldehyde‐4‐chloro‐2‐aminothiophenol (QNS), that are [Cd(QNS‐1H)Cl] (1), [Cu(QNS‐1H)2] (2) and [Pd(QNS‐1H)Cl] (3), were synthesized. Their structures were determined by ESI‐MS, EDX, IR and 1H NMR spectroscopies. The results showed that in (1) and (3) complexes the ratio of M(II):QNS ligand is 1:1, M(II) is bound to QNS through O, Nquinoline and Nbenzothiazole atoms. In complex (2), Cu(II) is bound to the QNS ligand in the 1:2 ratio through Oquinoline and Nquinoline atoms. The complexes were tested for cell in vitro cytotoxicity on human cancer cells. Complex (1) gives better antitumor activity than the remaining complexes on four cancer lines including KB, Hep‐G2, A549 and MCF‐7. The effect of complex (1) on KB and MCF‐7 is higher than cisplatin, a cancer treatment drug, with IC50 values of 15.01 and 17.94 μM, respectively.
Herrmananes A and B, two new sulfated hydrocarbons from the sea cumber Stichopus herrmanni
Authors: Vien Le Thi , Hanh Tran Thi Hong , Quang Tran Hong , Van Thanh Nguyen , Cuong Nguyen Xuan , Nam Nguyen Hoai 
Published: March 2024

AbstractUsing various chromatographic separations, two new sulfated hydrocarbons namely herrmananes A and B (1 and 2) were isolated from the aqueous fraction of the methanol residue of the sea cucumber Stichopus herrmanni. Their chemical structures were elucidated by extensive analysis of the 1D, 2D NMR and HR‐QTOF mass spectra. In addition, compound 1 showed significant cytotoxicity on SK‐Mel‐2 cell line with IC50 value of 23.12 ± 1.87 μM, whereas 2 exhibited moderate effect on this cell line with IC50 value of 55.28 ± 4.17 μM.
Cost‐effective fast prototyping using a dry film photoresist for micromixers towards point‐of‐care devices
Authors: Quynh Luc Nhu , Doanh Vu Viet , Thao Pham Ngoc 
Published: March 2024

AbstractThis paper deals with a novel structure of serpentine micromixer with its high mixing efficiency and its fabrication of soft photolithography molds using dry film photoresist as an alternative to the conventional liquid photoresist, such as SU‐8. This method provides simplification, significant time‐savings, low cost due to non‐cleanroom setting and less toxic developer solution. In this paper, the design, simulation, fabrication and experimental analysis of the passive micromixers have been presented. The mixing efficiency of the chip was implemented by using of micro‐barrier structure along its meander microchannel. The serpentine structures with and without embedded grooves on their micro sidewalls were designed and compared together in order to prove good mixing performance. Experimental measurements were introduced using white and green food dyes as the mixing fluids. The mixing efficiencies of micromixers were determined and compared in the analytical model and the mixing test. It was found that grooved structures significantly enhanced the performance of the serpentine micromixers due to induce perturbations in the flow field. By optimizing the design of the serpentine micromixers equipped with embedded grooves under its simple fabrication method making this study a promising solution for a wide variety of application.
Synthesis of hierarchical binary core‐branch nanocomposite of carbon microspheres@α‐Fe2O3 for enhancing electrochemical behavior
Authors: Hai Ho Van Minh , Anh Nguyen Thi Hong , Ky Vo The , Thang Nguyen Quoc , Van Cuong Nguyen 
Published: March 2024

AbstractA facial strategy for the synthesis of hierarchical binary core‐branch carbon microspheres (CMS)@α‐Fe2O3 is presented. X‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FT‐IR), energy‐dispersive X‐ray spectroscopy (EDX), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high‐resolution TEM (HR‐TEM), and Brunauer–Emmett–Teller (BET) were used to characterize the structural and morphological properties of the products. XRD diffraction analysis of CMS@α‐Fe2O3 reveals the highly crystalline nature of α‐Fe2O3 in the hierarchical binary core‐branch CMS@α‐Fe2O3 nanocomposite. Morphological analyses show that the α‐Fe2O3 shell layer grew onto the surface of CMS to form nanoscale heterointerfaces in the core‐branch structure, demonstrating the effectiveness of the synthesized route. More importantly, CMS@α‐Fe2O3 demonstrated superior electrochemical behavior to CMS. The enhanced CMS@α‐Fe2O3 electrochemical performance can be attributed to its large specific surface area, which allows for the rapid transfer of electrons into the electrode during the redox process.