bluuebunny/crossref_metadata_2025_split huggingface dataset:
Secondary metabolites from the tubers of Dioscorea persimilis
Authors: Ngan Nguyen Thi Thanh , Hoang Nguyen Huy , Hien Nguyen Thu , Lan Nguyen Ngoc , Huong Pham Thi Mai , Quang Tran Hong 
Published: March 2024

AbstractSeven secondary metabolites were isolated from the aqueous fraction of Dioscorea persimilis tubers using combined chromatographic techniques. Their structures were identified as 4‐O‐(6′‐O‐glucosyl‐4′′‐hydroxybenzoyl)‐4‐hydroxybenzyl alcohol (1), trans‐N‐p‐coumaroyltyramine (2), cyclo‐(Phe‐Tyr) (3), syringaresinol (4), syringaresinol O‐β‐D‐glucopyranoside (5), corchoionoside C (6), and oct‐1‐en‐3‐yl arabinopyranosyl‐(1→6)‐β‐glucopyranoside (7) by 1D and 2D NMR and MS methods in comparison with the data reported in the literature. In addition, weak cytotoxicity on HepG2, MCF7, and SK‐Mel‐2 cancer cell lines were observed for compounds 1‐3. Notably, this is the first time to report the isolation, structural elucidation, and cytotoxicity of compound 1.
Facile synthesis and characterization of CuCl@MIL‐101(Cr)‐NH2 framework for carbon monoxide adsorption
Authors: Ky Vo The , Van Cuong Nguyen , Hoa Vu Thi , Quang Duong Tuan 
Published: March 2024

AbstractThe development of a highly efficient CO‐selective adsorbent with high CO adsorption and selectivity is a challenging task. In this work, a novel adsorbent CuCl@MIL‐101(Cr)‐NH2 [Cu(I)@MIL‐101(Cr)‐NH2] with varied Cu(I) loads was fabricated for CO adsorption. An equimolar mixture of CuCl2 and Cu(HCOO)2 was first impregnated into MIL‐101(Cr)‐NH2 host, followed by reduction at a low temperature of 150 oC. The obtained material was characterized by XRD, FT‐IR, XPS, FE‐SEM, TGA, and N2 sorption methods. CO adsorption experiments revealed that the Cu(I)@MIL‐101(Cr)‐NH2 showed considerably improved CO‐adsorbing capacity owing to the formation of π‐complex between Cu+ and CO. At 25 oC and 100 kPa, the prepared adsorbent contained 30 wt% of CuCl exhibited a maximum CO uptake capacity of ~2.40 mmol.g‐1, exceeding many other Cu(I)‐containing adsorbents that used conventional host materials, such as CuCl/γ‐Al2O3, CuCl/MCM‐41, CuZSM‐5, Cu(I)‐loaded porous organic polymer, CuCl/AlOOH, and CuCl@γ‐Al2O3. Furthermore, Cu(I)@MIL‐101(Cr)‐NH2 exhibited a higher isosteric heat of CO adsorption than MIL101(Cr)‐NH2. The findings suggest that incorporating Cu(I) into metal‐organic frameworks could be a promising strategy for developing CO‐selective materials.
Investigation of structural and conductivity properties of poly(vinyl alcohol)‐based electrospun composite polymer blend electrolyte membranes for battery applications
Authors: Gul Rahmat , Mahmood Wan Ahmad Kamil 
Published: March 2024

AbstractSolid polymer electrolyte has attracted great interest for the next generation of electrochemical devices such as batteries, but the low ionic conductivity and poor stability has retarded their commercial acceptance for energy storage devices applications. To overcome these issues, strategies to develop composite polymer electrolytes (CPEs) are drawing interest. Nanocomposite solid polymer blend electrolyte membranes based on poly (vinyl alcohol) (PVA), poly (vinyl pyrrolidone) (PVP) of various compositions that contained potassium nitrate (KNO3) as a dopant salt, and Barium Titanate (BaTiO3) as a filler were prepared with various concentrations of filler using electrospinning technique. The structural and complex formations due to interaction of various groups of the prepared composite polymer electrolyte membranes were investigated using X‐ray diffraction (XRD) and Fourier transform infra‐red (FTIR) spectral analysis. The conductivity of the PVA‐PVP‐KNO3‐BaTiO3 polymer electrolyte systems was found to vary between 3.71×10‐9 and 1.99×10‐5 S cm‐1 at 298 K with the increase in filler concentration. The maximum room temperature ionic conductivity (1.99×10‐5 S cm‐1) has been obtained for 9 wt% BaTiO3 doped polymer electrolyte system. The addition of filler also enhanced the thermal stability of the electrolyte. The temperature dependence ionic conductivity of the prepared complexed polymer electrolyte systems appears to obey Arrhenius behaviour.
Structural aspects, reactivity analysis, wavefunction based properties, cluster formation with helicene and subsequent detection from surface enhancement in Raman spectra of triclabendazole studies using first principle simulations
Authors: Pooventhiran T. , Thomas Renjith , Bhattacharyya Utsab , Sowrirajan S. , Irfan Ahmad , Rao D. Jagadeeswara 
Published: March 2024

AbstractThis manuscript aims to study the structure and the other physical and chemical properties of triclabendazole, which is used to treat liver flukes, with the help of electronic structure methods. With the help of density functional theory, the ground state geometry of the triclabendazole molecule was optimized using B3LYP functional along with aug‐cc‐pVDZ basis set. The reactivity descriptors were discussed in detail to evaluate the biological potential of the compound. The molecule was found to show excellent nonlinear optical properties when compared to standard molecules like urea and p‐nitroacetanilide. Wavefunction dependent properties like ALIE, LOL, LIE etc. studies provided a lot of information regarding the electronic properties that are ample for predicting the bioactivity of the same molecule. The molecule gets adsorbed over the surface of the helicene nanocluster with slightly negative adsorption energy and shows an effective SERS mechanism.
Phenolics and triterpenoids from the bark of Sterculia foetida Linn.
Authors: Tuyen Pham Nguyen Kim , Trang Nguyen Thi Quynh , Hoa Nguyen Thi , Doan Huynh Cong , Chi Huynh Bui Linh , Huy Tran The Anh , Trang Nguyen Thi Thu , Tien Dang Thi Cam , Thu Nguyen Thi Hoai 
Published: March 2024

AbstractSterculia foetida belongings to Sterculiaceae family possessed many bioactivities for treatment of rheumatism, emphysema, laxative, diuretic, asthma, arthritis, antipyretic, antibacterial, antifungal and antibiotic, etc. However, the bark of this species was the understudied part. Herein, eight compounds consisting of cleomiscosin A (1), cleomiscosin C (2), quercetin (3), kaempferol 3‐O‐β‐D‐xylopyranoside (4), lupeol (5), lupenone (6), betulinic acid (7), and taraxerol (8) were reported from the Sterculia foetida bark collected at Binh Thuan province, Viet Nam. Their chemical structures were elucidated by the MS and NMR spectroscopic analysis as well as the comparison of their NMR data with the reported data. Compounds 1 and 2 were notified for the first time from Sterculia genus.
Facile fabrication of LaFeO3/zeolite composite for degradation of tetracycline with enhanced photo‐Fenton catalytic activity under visible light
Authors: Nga Phan Thi To , Nhan Phan Chi , Huyen Tran Thi Thanh ,   Phan Thi To Nhu
Published: March 2024

AbstractLaFeO3/zeolite (LFO‐Z) composite has been successfully synthesized via impregnation‐calcination method for the photo‐Fenton degradation of Tetracycline (TC). The incorporation of LaFeO3 particles on zeolite support contributes to the enhancement in photo‐Fenton catalytic activity of LFO‐Z photocatalyst by increasing the contact area between the material and TC molecules. The LFO‐Z photocatalyst was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X‐ray diffraction (XRD), N2 adsorption‐desorption, and optical absorption spectra. Different operational parameters such as catalyst dosage, H2O2 concentration, pH was investigated in the photo‐Fenton catalytic degradation of TC. 76.4 % of TC was degraded after 150 min exposure to visible light under the conditions of 1 g L‐1 LFO‐Z, 10 mg L‐1 TC, 10 mM H2O2 and pH of 6. The LFO‐Z composite shows a high stability and reusability, suggesting its potential use as a photocatalyst for pharmaceutical degradation via the photo‐Fenton process.
Furofuran lignans from Valeriana jatamansi with their antioxidant and anticancer properties
Authors: Huong Tran Thu , Tram Le Huyen , Van Thong Nguyen , Minh Nguyen Hoang , Minh Tran Thi , Quang Tran Thuong , Ha Tran Thu , Hung Nguyen Duc , Van Don Dao , Nguyen Thi Minh Nguyet , Park Jong‐Tae 
Published: March 2024

AbstractValeriana jatamansi is hired as multiple remedies for treatment of insomnia and circulatory disorders, asthma, dry cough, jaundice, and skin diseases. A phytochemical investigation from the whole plant of V. jatamansi resulted in isolation and identification of five furofuran lignans including 8‐hydroxypinoresinol‐4‐O‐β‐D‐glucoside (1), 8‐hydroxypinoresinol‐4'‐O‐β‐D‐glucoside (2), prinsepiol‐4‐O‐β‐D‐glucopyranoside (3), (+)‐pinoresinol‐O‐β‐D‐glucopyranoside (4), and (+)‐syringaresinol (5) for the first time. Their structures were elucidated by analysis and comparison of their spectroscopic data with those reported in the literature. Furthermore, the biological properties of these isolates were evaluated in vitro for anti‐oxidant and anticancer activities.
Current situation and health risk assessment of acetaminophen and chlorpheniramine maleate in urban house dust from Hanoi, Vietnam
Authors: Hoang Ho Nguyen , Hanh Duong Thi , Ha Le Song , Duong Nguyen Thanh , Ha Trinh Thu 
Published: March 2024

AbstractAcetaminophen and chlorpheniramine maleate are widely used as pain medications, they still have negative impacts on the environment as well as affect human health adversely. However, there are few studies evaluating levels of these medicals in airborne environments especially house dust. Therefore, this study aimed to investigate distribution, concentration and assess risk to human health of acetaminophen and chlorpheniramine maleate in house dust samples collected from 6 inner districts of Hanoi. Acetaminophen was found in 80 % house dust samples with an average concentration of 0.295 μg/g (ranging from 0.038 to 1.480 μg/g). Meanwhile, the average concentration of chlorpheniramine maleate was revealed much lower at 0.024 μg/g (ranging from 0.013 to 0.051 μg/g, the detection frequency of 80 %). Based on the measured concentrations, the acute daily intake doses of acetaminophen and chlorpheniramine maleate for adults and children were calculated to be 1.57 × 10‐1; 2.82 and 1.29 × 10‐2; 2.32 × 10‐1, respectively, the estimated values of Hazard Quotient (HQ) were 6.3 × 10‐7; 1.13 × 10‐5 and 4.04 × 10‐8; 7.24 × 10‐7, respectively. All HQ values of the pain relievers were < 1 for both adults and children, indicating the potential adverse effects to humans are negligible.
Review: Bioactive metabolites and host‐specific toxins from endophytic Fungi, Alternaria alternate
Authors: Hashad Nashwa , Ibrahim Reham , Mady Mohamed , Abdel‐Aziz Mohamed S. , Moharram Fatma A. 
Published: March 2024

AbstractGenus Alternaria is widely distributed fungus isolated from many plants among which Alternaria alternate that has a wide range of metabolites which possess a great variety of biological activities as being anticancer, antioxidants, antimicrobial. This review will highlight the structurally different secondary metabolites reported from A. alternate species including its host specific metabolites, their function, and their bioactivity.
In silico study on inhibitability of flavonoidal derivatives against Helicobacter pylori and their pharmacological potentiality
Authors: Quy Phan Tu , Du Ly Nguyen Hai , Triet Nguyen Thanh , Bui Thanh Q. , Hai Nguyen Thi Thanh , Thang Le Quoc , Cuong To Dao , Van Chen Tran , Nhung Nguyen Thi Ai 
Published: March 2024

AbstractFlavonoidal derivatives sinensetin (F1), isoorientin (F2), naringenin (F3), morin (F4), daidzein (F5) were experimentally demonstrated with effectiveness against Helicobacter pylori, thus speculated for their inhibitory effects towards structures of mucin‐5AC protein (UniProtKB‐P98088) and urease (PDB‐1E9Z),and subjected for in silico investigations. 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 F2 and F4 possessing favourable electric configurations for intermolecular inhibition. Regarding ligand‐P98088, the order for static inhibitability is F2‐P98088 > F4‐P98088 > F3‐P98088 > F5‐P98088 > F1‐P98088. Regarding ligand‐1E9Z, the corresponding order follows: F2‐1E9Z ≈ F4‐1E9Z > F5‐1E9Z > F3‐1E9Z ≈ F1‐1E9Z. QSARIS‐based analysis reveals that all the candidates are highly bio‐compatible. ADMET‐based analysis specifies F2 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 in vitro enzyme assays or clinical trials.
Photocatalytic degradation of oily wastewater over ZnO‐CuO/rGO photocatalyst under visible light
Authors: Nga Phan Thi To , Duc Nguyen Minh , Van Minh Nguyen , Lien Nguyen Hong 
Published: March 2024

AbstractMetal oxide composites integrating with carbon materials have attracted a great deal of attention as the potential photocatalysts for environmental treatment. The ZnO‐CuO composites intergrated with reduced graphene oxide (rGO) were successfully prepared via co‐precipitation method. The crystalline structure of the ZnO‐CuO/rGO ternary composites was examined by the X‐ray diffraction analysis. Field emission scanning electron microscopy analysis shows the distribution of metal oxides onto the plate‐like graphene. The calculated band gap values of the ZnO nanoparticles (3.16 eV) were decreased to 2.62 eV in the prepared (ZnO/CuO)/rGO ternary composites. In this work, the photocatalytic activity of the ZnO‐CuO/rGO with 15 % rGO photocatalyst was evaluated for the chemical oxygen demand (COD) of oily wastewater treatment process, which showed COD removal reaching 95 % after 6 h exposure to visible light irradiation. Moreover, the recycle and recovery test revealed the relatively good stability and repetitive use of ZnO‐CuO/rGO for high COD removal of oily wastewater.
Preconcentration of lead in water samples using combined cloud point‐solid phase extraction based on TiO2/Mn3O4/Fe3O4 nanocomposite
Authors: Thuy Tran Thi Thanh , Phong Huynh Thanh , Van Trong Nguyen , Van Dat Doan 
Published: March 2024

AbstractIn this work, the TiO2/Mn3O4/Fe3O4 nanocomposite was successful developed for enrichment of lead ions by using combined cloud point‐solid phase extraction. Lead ions were then determined by GF‐AAS spectroscopy. The nanocomposite was characterized by SEM, EDX, and XRD techniques. The result showed that the nanocomposite is composed of relatively uniform granules with particle size distribution in the range of 40÷80nm. The combined cloud point‐solid phase extraction procedure was optimized for lead ions with the optimal parameters as the absorbent dosage of 10 mg, the extraction time of 40 min, 10 mL of 10 % Triton X‐100, 1 mL of 1M NaCl in neutral media at 80°C. The parameters for the elution of Pb2+ ions such as concentration, volume, and the time of elution were also studied. The results showed that the elution efficiency of Pb2+ ions reached 97.0 % using 5 mL of HNO3 1M with continuous shaking for 5 minutes. Under optimized conditions, the linear range was 0.5÷80.0 μg/L of Pb2+ ions (r2 = 0.998) with a detection limit of 0.27 μg/L. The relative standard deviation was calculated to be 5.61 % and the recovery efficiency of the method was about 96.30 %. The studied method was applied for the determination of lead content in water samples.
Ammonium‐Iron(III) metallacryptate inclusion complexes based on Aroylbis(N,N‐diethylthioureas): Synthesis and structure
Authors: Huy Nguyen Hung , Abram Ulrich , Thang Pham Chien 
Published: March 2024

AbstractOne‐pot reactions of pyridine‐ or catechol‐scaffolding aroylbis(N,N‐diethylthioureas), H2L1 or H2L2, with methanolic solutions of FeCl3 and NH4Cl bring about novel cationic ammonium‐inclusion complexes {NH4 ⊂ [Fe2(L)3]}+ (L = L1 or L2), which could be separated as PF6– salts. The inclusion compounds have been characterized by elemental analyses and spectroscopic methods such as HRMS, IR and SCXRD. Ammonium ions are captured in the intramolecular voids of {2}‐metallacryptands {[Fe2(L)3]} (L = L1 or L2) resulting from the octahedral coordination of Fe3+ ions with aroylthiourea moieties of the ligands. Hydrogen bonds are established between the NH4+ ions and the donor atoms of the cages.
Preparation and modification of zeolite A from kaolin for catalytic methanation of carbon dioxide
Authors: Son Do Cao , Anh Vo Thi Kieu , Thom Nguyen Thi , Nguyen Huynh Le Thanh , Hai Le Viet , Thien Co Thanh , Hoang Nguyen Thai , Lam Tran Dai , Nam Pham Thi , Trang Nguyen Thi Thu 
Published: March 2024

AbstractDifferent types of zeolite including Zeolite A are prepared from natural kaolin originated in Vietnam. Raw kaolin was collected from Phu Tho, Vietnam, underwent metakaolization at 650 °C within 2 hours and alkalination with NaOH to synthesize various zeolitic samples. Various characterization techniques were performed, including X‐ Ray Diffraction, Fourier‐transform infrared spectroscopy, and Scanning Electron Microscopy. Different concentrations of NaOH were utilized to study the difference of the prepared zeolite. Nickel‐doped zeolite A samples with different nickel loading were also prepared via ion exchange method and were employed as catalyst for the hydrogenation of carbon dioxide (CO2) to obtain methane (CH4). The best catalytic activity of 55.2 %CO2 conversion and 92.7 %CH4 selectivity was achieved with 10 %Ni/ZM1 at 350 °C, 1 atm, H2:CO2 ratio of 4:1, and gas hourly space velocity of 9,000 mL.g‐1.h‐1. This study demonstrates a promising pathway of modifying Vietnamese natural kaolin as a low‐cost but an effective alternative material for the preparation of zeolite A and its application in the carbon dioxide methanation reaction.
Overview: The value chain of Tra catfish in Mekong Delta Region, Vietnam
Authors: Tan Nguyen Duy , Tuyen Vo Thi Xuan , Ha Ho Thi Ngan , Dao Dong Thi Anh 
Published: March 2024

AbstractAquaculture of Tra catfish (Pangasius hypophthalmus) of Mekong Delta has a record production of 1,525 million tons in 2022. It is one of the largest single‐species based farming systems that is restricted to a small geographical area, in the world. The product (frozen fillets) that has been exported to over 138 countries with a value of about 1.6 billion USD is an acceptable alternative to white fish. Tra catfish is farmed in earthen ponds, up to 4 m in deep, in nine provinces in the Mekong Delta in South Vietnam. Over the years, the Tra catfish farming and processing industry in Vietnam has been constantly developed and become a spearhead economic sector of Vietnam which has become a leading part of international economic integration. However, due to the global impact of the Covid‐19 epidemic with increasing competition pressure and product quality requirements, the Tra catfish industry is facing both challenges and opportunities. Therefore, in this paper, the Tra catfish such as species, anatomical composition, and chemical composition is briefly reviewed. After that, the value chain of Tra catfish in the Mekong Delta as well as demand forecasting and development orientation in the future is further analyzed.
Preparation of preservative coating for tomatoes based on polyphenol modified chitosan and silver nanoparticles
Authors: Huynh Mai Duc , Linh Nguyen Thi Dieu , Chinh Nguyen Thuy , Trang Nguyen Thi Thu , Manh Vu Quoc , Linh Nguyen Ngoc , Thang Dam Xuan , Anh Nguyen Thi Lan , Nam Nguyen Tuan , Giang Nguyen Vu , Trung Vu Quoc 
Published: March 2024

AbstractThis paper presents the modification of chitosan with polyphenols and application the modified chitosan in storage of tomatoes fruits. The ascorbic acid was used as a initiator for the modification reaction. The content of polyphenols was varied from 5 to 20 wt.% in comparison with chitosan weight. Some methods and techniques were used to characterize chitosan and modified chitosan including to infrared (IR) spectroscopy, DPPH assay and inhibition zone diameter by diffusion agar. The obtained results showed that chitosan was modified successfully with polyphenols. The modified chitosan samples have good antioxidant activity and against to E. coli, S. Aureus, and C. albicans. Based on the antioxidant activity and antimicrobial activity results, the most suitable content of polyphenols was found at 10 wt.%. The chitosan modified with 10 wt.% of polyphenols in a combination with nano Ag solution exhibits a significant efficiency on preventing the weight loss as well as remaining color, the firmness, and the soluble solids content (SSC) of tomato fruits during 20 days of testing. Moreover, the modified chitosan/nano Ag also has a great ability in inhibiting the growth of microbial on the skin of tomatoes during post‐harvesting storage.
Synthesis of metal organic framework based on Cu and benzene‐1,3,5‐tricarboxylic acid (H3BTC) by potentiodynamic method for CO2 adsorption
Authors: Phuong Nguyen Thu , Hai Do Thi , Doneux Thomas , Nam Nguyen Hong , Thanh Dinh Thi Mai 
Published: March 2024

AbstractPractical CO2 adsorption processes require adsorbents that can be easily and quickly synthesized at a reasonable cost, while maintaining a significant adsorption performance. In this research, a metal organic framework based on Cu and H3BTC was synthesized by the potentiodynamic method. Results showed that the nature of the solvent strongly affected the phase structure, morphology and specific surface area of the obtained material. In methanol, a mixture of 1D structure Cu‐BTC (catena‐triaqua μ‐[1,3,5‐benzenetricarboxylato]‐copper (II) corresponding to the formula [Cu(BTC)(H2O)3)]n and micropillars structure Cu(BTC).3H2O was obtained. The 1D structure Cu‐BTC had a plate shape and a small specific surface area of 21 m2/g. In ethanol, the 3D structure Cu‐BTC (Cu3(BTC)2) was successfully synthesized. The obtained material has a cubic shape of size from 50 nm to 500 nm and a much better specific surface area of 620 m2/g. The 3D structure Cu‐BTC offered a high CO2 adsorption capacity of 3.6 mmol/g at standard conditions, and 1.6 mmol/g at more realistic conditions.
Study on α‐glucosidase inhibitory activity of isolated flavones from genus Artocarpus and their enzyme kinetics
Authors: Truong Thang Quoc , Le Tho Huu , Nguyen Minh Binh , Pham Dat Tat , Dinh Quynh Phuong Thuy , Nguyen Hai Xuan , Van Do Truong Nhat , Nguyen Mai Thanh Thi 
Published: March 2024

AbstractFlavonoids are the major compounds associated with diverse bioactivities, especially with α‐glucosidase inhibitory activity related to diabetes mellitus. The study reported the α‐glucosidase inhibitory activity of seventeen flavonoids isolated from Artocarpus heterophyllus, Artocarpus rigida, and Artocarpus altilis. The results indicated that all flavones possessed an α‐glucosidase inhibitory effect, in which compounds 3, 5‐7, 9‐17 strongly inhibited α‐glucosidase enzyme with the IC50 value range from 1.5 to 6.4 μM. Based on their structure‐activity relationships, the prenylation patterns at the flavonoid skeleton gave significantly potent inhibitory abilities against α‐glucosidase. Further kinetics studies were conducted to determine the inhibition type of these prenylated flavones. This is the first time prenylflavones isolated from genus Artocarpus were reported on the α‐glucosidase inhibitory activity and its kinetics. The report suggested that prenylflavones are potential sources for diabetes mellitus treatment.