bluuebunny/crossref_metadata_2025_split huggingface dataset:
Morphology and properties of polybutylene succinic and cassava starch blend: Effect of esterification catalysts on graft copolymer formation
Authors: Duc Vu Minh , Giang Nguyen Chau 
Published: March 2024

AbstractThe purpose of this research is to produce of esterified thermoplastic starch (ETPS) for reactive extrusion melt‐blending with polybutylene succinate (PBS) in film blowing application. Esterification TPS named M‐TPS and T‐TPS were prepared from cassava starch, glycerol (plasticizer), and maleic anhydride (MA), tartaric acid (TA) as reactive compatibilizers in a twin extruder, respectively. FTIR results showed that esterification reactions were successfully formed between both MA and TA with cassava starch. The esterified TPSs was then melt blended with PBS in the presence of four kinds of esterification catalysts. The effect of compatibilizer contents on the blend properties was studied in terms of tensile properties, melt flow index (MFI), and electron scanning microscopy (SEM). The results show that TA induced better compatibilization effect than MA did, as evidenced by the PBS/T‐TPS blend possessing higher strength than these of PBS/M‐TPS, although SEM images showed structural morphology of both blends is similar. The effect of the esterification catalyst type and contents on properties of the PBS/T‐TPS blend was also studied. The results from the Molau test confirmed the formation of graft‐copolymer (PBSgT‐TPS) at the interface of two phases of the blend when compatibilizers were added in the presence of an organotin compound catalyst.
Solar light‐driven photocatalyst‐enzyme attached artificial photosynthetic system for regeneration and production of 1,4‐NADH and L‐glutamate
Authors: Singh Chandani , Kumar Abhishek , Yadav Rajesh K. , Gole Vitthal L. , Dwivedi D. K. 
Published: March 2024

AbstractIn artificial photosynthesis process the photocatalyst‐enzyme attached system is a best strategy to utilize solar energy for solar chemical/fuels production. Herein, we prepared a solar light active graphene‐based photocatalyst received by the covalent attachment of 9‐aminoanthracene (AA) chromophore with chemically converted graphene (CCG) for highly efficient 1,4‐NADH regeneration (79.9 %) and conversion of α‐ketoglutarate (α‐KG) in to L‐glutamate (L‐GM) (88.3 %) in 2 hrs. The present result is a benchmark example of highly selective solar light active enzyme based artificial photosynthetic system for selective formation of L‐GM from α‐KG.
Preparation of CaCO3 nano and microparticles from phosphogypsum of Dinh Vu DAP plant, Viet Nam
Authors: Phuong Dang Ngoc , Chi Ngo Kim , Le Minh Tran , Luat Hoang Huu , Truyen Chu Quang , Lam Tran Dai 
Published: March 2024

AbstractThis study reports creating CaCO3 nanoparticle (NPs) and microparticles (MPs) from treated phosphogypsum of Dinh Vu Diamon phosphate plant in Vietnam. In this research, CaCO3 NPs and MPs were received in the system of Ca(OH)2 ‐ CO2 gas ‐ H2O by aeration method. The research samples are characterized by ultraviolet visible spectrophotometry (UV‐vis), scanning electron microscopy (SEM), X‐ray diffraction (XRD) and dynamic light scattering (DLS). The study investigated the conditions for obtaining calcium carbonate NPs and MPs when changing the aeration speed of CO2 from 40 to 120 ml/min, the concentration of Ca(OH)2 from 0.04 M to 0.5 M, the temperature from 28 to 60 oC. This research showed that the clear influence of Ca(OH)2 concentration and reaction temperature on the CaCO3 particle size in the CO2‐Ca(OH)2 system. CaCO3 morphological structure has the form of calcite with rhombohedral block (rhomboid cylindrical box).
Simultaneous determination of acepromazine and atropine residues in porks, livers, kidneys by Ultra‐High‐Performance Liquid Chromatography‐Tandem Mass Spectrometry
Authors: Hieu Tran Quang , Phuong Pham Kim , Tan Nguyen Thanh , Thang Nguyen Quoc 
Published: March 2024

AbstractA method for determining the tranquilizers Acepromazine (ACP) and Atropine(ATP) in pig tissues (kidneys, livers, and porks) by using UPLC‐MS/MS has been developed. The liquid chromatographic separation and mass spectroscopy of the two substances have also been optimized. The justification data of the methods were: limit of detection (LOD) and limit of quantification (LOQ) 0.15 and 0.50 ng/mL for ATP, 0.16 and 0.5 ng/mL for ACP in all matrix samples. Calibration curves exhibited linearity in concentration varieties from LOQ to 12 ng/mL for ACP and LOQ to 20 ng/mL for ATP. Recovery, intra‐day precision, and inter‐day precision were determined at spiked analytes concentration of 2.0, 5.0, and 10 ng/mL for ACP and at analyte concentrations of 2.0, 6.0, 15.0 ng/mL for ATP. Recovery ranged from 98.26 to 119.43 % for ACP and 97.45 to 118.44 % for ATP. The effect of the matrix sample of the technique was found to be insignificant. The confirmed method has been applied to ascertain the content of two substances in the porks, kidneys, and livers of 16 pigs, injected Prozil Fort ‐ Veterinary Medicine (contained ACP and ATP) at different intervals. This work supplied a new method for scientists, which could be applied to determine the tranquilizers Acepromazine (ACP) and Atropine(ATP) in pig tissues.
Oxidation‐reduction reactions in geochemistry
Authors: Biswas Salah Uddin , Karmakar Kripasindhu , Saha Bidyut 
Published: March 2024

AbstractThere are more than hundred elements in the periodic table and many of them are associated with various geochemical processes. Most of the elements can show more than one oxidation states, therefore, reactions involving oxidation and reduction are of very much importance in geochemistry. Since every change (chemical or physical) is associated with the change of energy, hence for every single process, there should be a reliable way for quantitative measurement of energy change. In case of any redox process, the energy change can be quantitatively expressed in terms of reduction potential of that process. For better understanding of a geochemical process, previously known reduction potentials can be used. The main importance of reduction potentials in geochemistry is for understanding the frequent concentration and enrichment of various elements in deposits formed under extremely reducing or oxidizing conditions.
TD‐DFT benchmark for UV‐Vis spectra of coumarin derivatives
Authors: Van Bay Mai , Hien Nguyen Khoa , Tran Phan Thi Diem , Tuyen Nguyen Tran Kim , Oanh Doan Thi Yen , Nam Pham Cam , Quang Duong Tuan 
Published: March 2024

AbstractThe predictive performances for maximum absorption wavelength of the PBE, BP86, PBE0, B3LYP, M06, M06‐2X, CAM‐B3LYP, LC‐wPBE, APDF, wB97XD, and PW6B9D3 functionals have been benchmarked through comparison of maximum absorption wavelength values between calculation and experiment of 21 coumarin derivatives. For the results obtained from direct calculation by these functionals, the predictive performance decreases gradually in the following order: B3LYP > APDF > M06 > PW6B9D3 > PBE0 > BP86 > PBE > M06‐2X > CAM‐B3LYP > wB97XD > LC‐wPBE. B3LYP functional gives the best predictive performance, with the smallest value of the mean absolute error (MAE = 15 nm) and the root mean square deviation (RMSD=19 nm). When using the results obtained through correction based on the linear correlation, the predictive performance decreases gradually in the following order: M06‐2X > PBE0, M06, PW6B9D3 > B3LYP, APDF > CAM‐B3LYP, LC‐wPBE, wB97XD > PBE and BP86. M06‐2X functional gives the best predictive performance, with the smallest values of MAEfix (7 nm) and RMSDfix (9nm). The correction is very necessary because the values of the corrected maximum absorption wavelengths are closer to the experimental maximum absorption wavelengths. The values of MAEfix and RMSDfix are much smaller than those of MAE and RMSD.
Lipid, fatty acid composition and molecular species of betaine lipid in the green algae Halimeda incrassata Lamx. collected from Truong Sa archipelago
Authors: Hue Pham Thu , Anh Nguyen Van Tuyen , Trung Do Thi Thanh , Long Pham Quoc , Tien Dam Duc , Van Tran Thi Thanh , Thanh Le Tat 
Published: March 2024

AbstractIn this study, lipid classes, fatty acid composition, and molecular species of betaine lipid of the green algae Halimeda incrassata Lamx., collected from Truong Sa archipelago, have been identified. Five lipid classes including Pol, ST, FFA, TG, HW have detected on TLC chromatography. In the total lipid, 21 fatty acids have been indicated, in which, 4 fatty acids belonging to the PUFAs group with the valuable bioactivities and the high content are ALA, GLA, AA, EPA. From Halimeda incrassata, this is the first time 17 betaine lipid molecular species have been identified by HPLC‐HRMS technique. Interestingly, all of these molecular species belong to the diacylglyceryl‐N,N,N‐trimethylhomoserine group, which is the characteristic composition of the non‐flower plant.
Study on fabrication of MnO2/CNTs composite by electrolysis in neutral solution and its applicability as cathode materials in Mg‐ion batteries
Authors: Van Vy Uong , Que Le Xuan 
Published: March 2024

AbstractEffects of electrolysis conditions such as Mn2+ ions, and CNTs concentration, temperature, and solution stirring on electrochemical precipitation of MnO2/CNTs composite on SS 304 stainless steel anode electrodes were studied by cyclic voltammetry (CV) method. Results show that the MnO2/CNTs was fabricated at the electrode potential was more positive than 0.8 V/SCE with a suitable solution composition of 0.5 M Na2SO4, 0.4 M MnSO4 and CNTs 0.2 g/L, at 80 oC, and stirring speed ranging from 100 to 200 rpm. The obtained MnO2/CNTs composite materials contained a crystalline phase of MnO2 akhtenskite. The presence of CNTs in the composite was observed by FESEM image. Electrochemical properties of the MnO2/CNTs composites were studied by CV method and galvanostatic charge‐discharge. The composite materials have good discharge capacity, its specific capacity was 92 mAh/g, after 35 charge‐discharge cycles the specific capacity of the material decreased to 69.2 mAh/g, equal to 75 % of the first cycle.
Synthesis and alpha ‐ inhibitory activity of lupane type С2‐benzylidene‐ triterpenoids
Authors: Khusnutdinova Elmira F. , Ha Nguyen Thi Thu , Giniyatullina Gulnara V. , Anh Le Thi Tu , Poptsov Alexander I. , Kazakova Oxana B. 
Published: March 2024

AbstractA series of novel and previously synthesized lupane type С2‐benzylidene derivatives was evaluated on α‐glucosidase enzyme inhibition. Most of the tested compounds exhibited significantly better activity (1.8‐700 times higher) than the standard drug acarbose. The structure‐activity relationship indicated that the type of benzylidene moiety and C28‐substituent of lupane core plays an important influence on the activity. Methyl 2‐furfurylidene betulonate, m‐iodo‐benzylidene betulonic acid and 3‐pyridinylideno‐betulonic acid hydrazide have been founded as effective α‐glucosidase inhibitors and deserve further attention.
Molecular species of glycolipid and anti‐inflammation activity of lipid fractions in the green algae Halimeda incrassata Lamx. collected from Truong Sa, Viet Nam
Authors: Thanh Le Tat , Anh Nguyen Van Tuyen , Hue Pham Thu 
Published: March 2024

AbstractIn this study, 40 glycolipid molecular forms have been identified belonging to 3 groups of MGDG (12), DGDG (11), SQDG (17). The MGDG molecular forms count for a high concentration in the PUFA fatty acid component such as C18:2, 18:3, 20:4. The DGDG forms mainly contain saturated fatty acids and 1 double‐bonded while the SQDG forms have the intertwine between saturated fatty acids and super long and long‐chain HUFA fatty acids (over 20C and 4 double bonds) such as C20:4, 20:5 and 22:6. Results of biological activity test for three lipid fractions of Halimeda incrassata Lamx. seaweed have showed that they have anti‐inflammatory activities from 32.57±5.75 to 41.66±1.95 μg/mL, of which the highest is the polar lipid fraction. This showed that this is a potential source to continue screening for bioactive compositions to apply on the medicine and pharmacy.
A computational approach to explore the binding mechanism of secondary metabolites of Hamigera ingelheimensis with AgrA quorum sensing proteins
Authors: Basak Hriday Kumar , Paswan Uttam , Chatterjee Abhik 
Published: March 2024

AbstractBacterial resistance to existing antibacterials can be handled by focusing on the bacterial communication system, specifically bacterial quorum sensing system. Inhibiting AgrA‐DNA binding is an effective strategy for reducing the expression of diverse genes involved with the secretion of virulence factors by the Agr quorum sensing system. Hamigera ingelheimensis, a common soil fungus, produces several bioactive secondary metabolites including avellanin C which is a well‐recognised and deeply studied quorum sensing inhibitor. Among the several metabolites, we selected ten metabolites and other metabolites have been rejected either some of them were exhaustively studied or during primary docking screening, they did not show promising docking scores. These ten metabolites were docked with template protein (PDB ID: 4G4K) and with five homologies modelled AgrA proteins using AutoDock tool. Avellanin A, avellanin B and PF1171B showed a promising binding score with all the proteins with binding free energy less than ‐8.00 kcal.mol‐1. Molecular dynamics simulations suggest that their docked complexes are stable. These three metabolites have drug‐likeness features and thus have the tremendous prospect to be used as the AgrA inhibitors.
Hepatoprotective effect of water extract formulation from Stixis suaveolens and Pandanus tonkinensis against liver injury induced by acetaminophen and in vitroCCl4‐induced toxicity
Authors: Tung Bui Thanh , Hai Nguyen Thanh , Anh Duong Hong , Viet Pham Hung , Schmitz Oliver J. , Van Tuyen Nguyen , Anh Ngo Quoc 
Published: March 2024

AbstractA herbal remedy formulation including Stixis suaveolens and Pandanus tonkinensis has been established to treat liver diseases in the North‐West region of Vietnam. This study aimed to provide in vitro as well as in vivo scientific evidences which illustrate the hepatoprotective effect of water extract of the above formulation. As a result, the highest oral dosage of water extract equivalent to 29.6 g/kg did not induce any toxic phenomena. Histopathological study showed that water extract formulation could reverse the damage caused by acetaminophen in mice. The water extract reduced significantly the level of ALT and AST enzyme, MDA, TNF‐α and IFN‐γ concentrations in mice treated with acetaminophen compared with control disease group. Furthermore, one of ten fractions from the formulation (F8) showed the strongest hepatoprotectivity in model of CCl4‐induced toxicity in HepG2 cells. Thus, the water extract formulation could be a potential candidate for the protection of liver from diseases.
Study on structural and electronic properties of rutile TiO2 using DFT + U approach
Authors: Thoa Tran Thi , Van Hung Hoang , Hue Nguyen Thi Minh 
Published: March 2024

AbstractEffects of Hubbard parameters Ud, Up and Ud‐Up pairs on structural and electronic properties of rutile TiO2 have been investigated using the DFT + U method, wherein Ud, Up were applied to Ti 3d‐orbitals and O 2p‐orbitals, respectively. The Ud, Up parameters range from 3 to 10 eV. Calculations have shown that Up = 10 eV is the optimal value to describe both structural and electronic properties of rutile. For Ud, an increasing in value of Ud results in expansion of band gap. However, high values of Ud lead to discrepancy in lattice constants. The effect of Ud is in good agreement with previous works. The obtained results also indicated advantages of combination of Ud and the optimal Up. The combination not only decreases discrepancy in lattice constants but also enlarges band gap more than Ud correction. Thanks to the optimal Up, we have achieved a band gap of 2.92 eV only with Ud = 7 eV. The Ud‐Up pairs of 8‐10, 9‐10 and 10‐10 give band gaps which is suitable with the experimental value.
Utilization of natural surfactants: An approach towards sustainable universe
Authors: Mondal Subhodip , Acharjee Animesh , Saha Bidyut 
Published: March 2024

AbstractA broad range of microorganisms produce biosurfactants, which are surface‐active compounds. They are molecules with both hydrophilic and hydrophobic domains that can lower the growth medium's surface tension and interfacial tension. Since they are nontoxic and biodegradable, biosurfactants can be used as a green substitute in various situations. Biosurfactants are also primarily used in the pharmaceutical and oil sectors, as well as in pollutant bioremediation. Aside from these, biosurfactants can be used in a wide range of food and agriculture industries, cosmetics, and skincare products. We sincerely hope that this review will help to understand the different applications of biosurfactants and their future potential.
In silico screening of natural antivirals as potential inhibitors of SARS‐CoV‐2 virus
Authors: Hang Ta Thi Thu , Khanh Do Thi Hong , Tung Bui Thanh 
Published: March 2024

AbstractCoronavirus infectious disease 2019 (COVID‐19) is an infectious disease of the human respiratory tract caused by the SARS‐CoV‐2 virus. Spike protein is a class I glycoprotein trimeric TM involved in viral entry and infection. Four major targets to inhibit the SARS‐CoV‐2 virus are spike protein, angiotensin‐converting enzyme 2 (ACE2), main protease and the enzyme RNA‐dependent RNA polymerase (RdRp). In this study, we evaluated the inhibitory potential of natural antiviral compounds against spike protein, ACE2, main protease, RdRp targets by molecular docking and molecular dynamics simulations. Lipinski Rule of Five was used to evaluate the drug‐like properties of these compounds. The pkCSM tool was used to assess the pharmacokinetic parameters of prospective substances. Based on the ChemFaces database, we have collected 273 natural antiviral compounds. The results showed that the 7/273 compounds with the most potential to inhibit SARS‐CoV‐2 were: hinokiflavone, sotetsuflavone, mulberroside C, daphnoretin, morellic acid, digitoxin, and hypericin. Among them, sotetsuflavone is the most potent compound that inhibits four targets, with drug‐like properties, good intestinal absorption, and low toxicity. The molecular dynamics simulation results of the complexes are also relatively stable. As a results, in vitro and in vivo test should be carried out to verify the potential for COVID‐19 treatment of this compound.
Xestospongiene VN1, a new brominated polyunsaturated lipid from marine sponge Xestospongia testudinaria (Lamark, 1815)
Authors: Tai Bui Huu , Hang Dan Thi Thuy , Thung Do Cong , Trang Do Thi , Yen Pham Hai , Yen Duong Thi Hai , Huong Phan Thi Thanh , Dung Duong Thi , Cuong Ngo Cao , Thao Do Thi , Nhiem Nguyen Xuan , Van Kiem Phan 
Published: March 2024

AbstractPhytochemical study on the methanol extract of the marine sponge Xestospongia testudinaria (Lamark, 1815) led to the isolation of one new ((6Z,8E,13E,15Z)‐6,14,16‐tribromo‐5,10‐dihydroxyhexadeca‐6,8,13,15‐tetraenoic acid named xestospongiene VN1, 1) and nine known brominated polyunsaturated compounds, xestospongiene z5 & z6 (2), xestospongiene z9 & z10 (3), xestospongiene S (4), xestospongic acid (5), xestospongic acid methyl ester (6), (13E,17E)‐18‐bromo‐octadeca‐13,17‐diene‐5,7,15‐triymoic acid (7), xestospongiene I & J (8), xestospongiene K & L (9), and xestospongiene C & D (10). The chemical structures of these compounds were elucidated by extensive spectroscopic analyses including HR‐ESI‐MS, 1D and 2D NMR, circular dichroism, and by comparison of the spectral data with those of previously reported data. This is the first report of these compounds from Vietnamese marine sponge X. testudinaria.
Constituents of Vernonia gratiosa Hance and their α‐glucosidase and xanthine oxidase inhibitory activities
Authors: Van Cong Pham , Van Hieu Ngo , Minh Bui Quang , Duc Ngo Viet , Trang Vu Thi , Hien Nguyen Thi Thu , Khanh Nguyen Viet , Anh Tran Thi Phuong , Dat Ton That Huu , Anh Le Tuan , Anh Hoang Le Tuan 
Published: March 2024

AbstractEight compounds, including 11β,13‐dihydrovernolide (1), apigenin (2), kaempferol (3), quercetin 3‐O‐methyl ether (4), quercetin (5), syringaresinol‐β‐ᴅ‐glucoside (6), 3‐hydroxy‐1‐(4‐hydroxy‐3‐methoxyphenyl)‐2‐[4‐(3‐hydroxy‐1‐(E)‐propenyl)‐2,6‐dimethoxyphenoxy]propyl‐β‐ᴅ‐glucopyranoside (7), and 5‐(methoxymethyl)‐1H‐pyrrole‐2‐carbaldehyde (8) were isolated from the aerial part of Vernonia gratiosa. Their chemical structures were identified by NMR experiments along with the comparison of their spectroscopic data with those reported in the literature. In addition, all compounds were evaluated for their inhibitory effects on α‐glucosidase and xanthine oxidase. Among them, only compound 7 showed the significant inhibition of α‐glucosidase with an IC50 value of 47.08 ± 3.98 μg/mL and xanthine oxidase activity with an IC50 value of 26.92 ± 1.04 μg/mL. Compounds 1‐5 were firstly isolated from V. gratiosa, while compounds 6‐8 were reported from the genus for the first time. This is the first study about this species growing in Vietnam.
Synthesis and characteristics of some new polythiophene containing α,β‐unsaturated carbonyl groups
Authors: Duong Tran Thi Thuy , Dua Nguyen Thi , Linh Nguyen Ngoc , Nguyet Le Thi , Tuyet Le Thi Minh , Hien Nguyen , Linh Duong Khanh , Hung Ha Manh , Oanh Doan Thi Yen , Chinh Nguyen Thuy , Oanh Vu Thi Ngoc , Ha Hoang Thu , Trung Vu Quoc 
Published: March 2024

AbstractSome new polythiophenes with α,β‐unsaturated carbonyl groups were synthesized using a chemical oxidative coupling reaction. IR, 1H‐NMR, UV‐Vis and Raman spectra were used to confirm the expected structure of polymer which is suitable for the suggested synthetic route. Two of all synthesized polythiophenes were soluble well in DMSO and CHCl3 solvent. The morphology, thermal stability, photoluminescence properties and conductivity of polymers were studied. The trans‐configuration of α,β‐unsaturated carbonyl side chain improve featured properties of these polymers.
Electrophoresis deposition of Au‐nanoparticles on FTO electrode for As(III) detection
Authors: Thang Nguyen Canh Minh , Linh Lam Gia , Anh Nguyen Hoang , Nguyen Huynh Le Thanh , Hai Le Viet , Hoang Nguyen Thai 
Published: March 2024

AbstractGold nanoparticles (AuNPs) were synthesized via redox reaction, using EDTA as a protecting and reducing agent, with HAuCl4 as precursor and seed solution. The appropriate reaction condition was found out, with the ratio of EDTA:HAuCl4 = 10:1, 40 μL of seed solution and stirring time of 5 minutes. The UV‐Vis spectroscopy observed that the appearance of two absorption peaks were at 574 and 755.5 nm with the average size of AuNPs was 64.5 nm, the zeta potential was positive. The synthesized AuNPs were deposited on FTO electrode by electrophoresis deposition. The results of solid UV‐Vis and SEM images showed that the spherical AuNPs ranging from 40 to 60 nm were deposited onto FTO to fabricate the AuNPs/FTO electrodes. The electrochemical activity of AuNPs/FTO were investigated based on the redox reaction of hydroquinone; the CV results showed the electrode with applied potential at 20 V for 60 minutes has the superior performance. The analysis of As(III) were conducted by AS‐SWV technique. The results showed that AuNPs/FTO electrode enable to detect As(III) at the concentrations higher than 5 ppb that is suitable for the WHO standard of domestic water.
Phytochemistry of the Aerial parts of Magnolia coriacea collected in Ha Giang, Viet Nam
Authors: Ninh Pham Thi , Dung Nguyen Thi , Van Loc Tran , Ha Chu Thi Thu , Thao Tran Thi Phuong , Van Chien Tran 
Published: March 2024

AbstractNine compounds, including two sesquiterpenes [((+)‐spathulenol (1), caryophyllenol‐II (2)], five flavonol glycosides [rutin (3), quercitrin (4), rhamnocitrin 3‐rutinoside (5), oxytroflavoside G (6), curcucomoside D (7)], and two hydrocarbons [2‐phyten‐1‐yl‐caprylate (8) and tritriacontan‐1‐ol (9)] were reported for the first time from the leaves and twigs of Magnolia coriacea. Their detailed structures were confirmed by 1D and 2D NMR spectra analyses and compared to the published data.