bluuebunny/crossref_metadata_2025_split huggingface dataset:
Chemical constituents of Launaea sarmentosa roots
Authors: Hanh Le Hong , Dung Phung Duc , Huy Lieu Dieu , Duong Ngo Thi Thuy , Wacharasindhu Sumrit , Phung Nguyen Kim Phi , Chi Huynh Bui Linh 
Published: March 2024

AbstractBy investigating the chemical constituents of the roots of Launaea sarmentosa, collected at Can Gio beach, Can Gio district, Ho Chi Minh city, nine compounds were isolated including α‐amyrin acetate (1), β‐amyrin acetate (2), lupeol acetate (3), ψ‐taraksasterol acetate (4), luteolin (5), 4‐allyl‐2,6‐dimethoxyphenol glucopyranoside (6), scorzoside (7), ixerisoside D (8) and 9α‐hydroxypinoresinol (9). To the best of our knowledge, all compounds were reported in other species, but this is the first time they were known in L. sarmentosa. Four compounds (1‐4) from the n‐hexane extract were identified by 4‐dimethylaminopyridine‐catalyzed benzoylation. Their chemical structures were elucidated by means of 1D and 2D NMR, HR‐ESI‐MS data analysis and compared with those reported in the literature.
Diterpene glycosides and phenolic compounds from the fruits of Xanthium strumarium
Authors: Van Kiem Phan , Hoang Nguyen Huy , Thu Vu Kim , Tai Bui Huu , Nhiem Nguyen Xuan 
Published: March 2024

AbstractSeven compounds including two diterpene glucosides atractyloside (1), carboxyatractyloside (2), and five phenolic compounds as 5‐O‐caffeoylquinic acid (3), 1,5‐di‐O‐caffeoylquinic acid (4), 2,3‐dihydroxy‐1‐(4(hydroxy‐3‐methoxyphenyl)‐propan‐1‐one (5), (erythro)‐1,2‐bis(4‐hydroxy‐3‐methoxyphenyl)‐1,3‐propandiol (6), and p‐hydroxybenzaldehyde (7) were isolated from the fruits of Xanthium strumarium. Their chemical structures were determined using ESI‐MS, 1D NMR, and 2D NMR spectra as well as by comparison of the spectral data with those reported in the literature. Compounds 4 and 5 were reported from Xanthium genus for the first time. To our best knowledge, all these compounds were firstly reported from X. strumarium growing in Vietnam.
A Review of some catalysts and promoters used in organic transformations
Authors: Acharjee Animesh , Saha Bidyut 
Published: March 2024

AbstractCatalytic processes are indeed greener modification as they completes in much shorter time with minimizing the need of external energy source with atom economy and high selectivity. In this article we presented a short review on utlisation of different catalysts such as ionic liquids, transition metal ions, nano particles, surfactants, amino acids etc. for C‐C coupling reactions to oxidation reactions. Stereoselective and regioselective transformations are also carried out using catalyst in organic synthesis. Use of catalyst in rate enhancement of oxidation reaction is of immense interest and a surplus rate increment is obtained by use of promoters.
A study on the application of Fenton process followed by coagulation for treatment of landfill leachate
Authors: Dung Nguyen Trung , Van Thanh Bui , Huy Nguyen Nhat 
Published: March 2024

AbstractIn this study, leachate from Quang Hanh landfill (Quang Ninh) was treated by a combination of Fenton and coagulation processes. The experiment was conducted with various Fenton (i.e., pH, H2O2/Fe(II) ratio and dosage, and reaction time) and coagulation (i.e., dosage, aeration time, and flocculant concentration) conditions to determine the best condition for treatment of the leachate. Regarding Fenton process, under the best condition, the COD removal efficiency of around 80 % with an inlet concentration of 624±80 mg/L, meeting QCVN 25:2009/BTNMT (Column B2) while 75 % of color, 25 % of ammonia, and 12 % of TSS were removed, creating favorable conditions for the next stage of treatment by coagulation. In terms of coagulation, CaO and polyaluminum chloride (PAC) were sequentially used for treating the leachate after Fenton process. After treatment with CaO (6 g/L, 180 min), PAC (1,500 mg/L), and A101 (2 mg/L), the removal efficiencies achieved 85 %, 99 %, 99‐99.5 %, and 88 % for COD, color, ammonia, and TSS, respectively, and the effluent can meet the treatment requirement by the discharge standards.
Compatibility of epoxidized natural rubber and polyaniline blend
Authors: Ha Nguyen Thu , Hoa Nguyen Thi , Van Tung Vu , Anh Nguyen Lan , Thuy Tran Thi , Ougizawa Toshiaki 
Published: March 2024

AbstractThe compatibility of binary blend of epoxidized natural rubber and polyaniline was investigated. Epoxidized natural rubber with 25 mol% of epoxy group content was prepared through epoxidation of deproteinized natural rubber in latex stage. Blends of epoxidized natural rubber and polyaniline with various ratios were prepared. The compatibility of the blends was examined through differential scanning calorimetry measurement and scanning electron microscopy observation. Obtained result showed that the presence of epoxy group significantly improved the compatibility of binary blends of epoxidized natural rubber and polyaniline blends. The compatibility significantly enhanced the electrical conductivity of epoxidized natural rubber/polyaniline blends.
Effect of stabilizing and brightening agents and some operated conditions on electroplating kinetics of NiCu alloys from citrate‐sulfate solutions
Authors: Van Vy Uong , Thang Le Ba , Huong Nguyen Thi Thanh , Que Le Xuan 
Published: March 2024

AbstractThe effect of stabilizing and brightening additives, temperature and stirring on electrodeposited kinetics of NiCu alloy has been studied by the linear polarization method. The additives almost do not affect on the electrochemical reduction rate of Cu2+ ions, however it has a much affect on the reduction rate of Ni2+ ions. The presence of boric acids, saccharin or 1,4‐butynediol have increased cathode polarization, inhibited precipitation alloy and shifted discharge potential of Ni2+ about 100 to 150 mV towards more negative. The solution temperature strongly affected on the polarization curve over the full range of investigated electrode potential, the cathode current increased about 1.5 times when the temperature increases from 30 to 50 oC. The stirring did not increase the discharge current of Ni2+ ions, on the contrary, it significantly increased the discharge current of Cu2+ ions, increasing from 2 to 3 times compared to when did not stir.
A New Approach for the Synthesis of Sotolon in Racemic and Enantioenriched Forms
Authors: Trang Bui Thuy , Thuong Cao Hai , Thao Pham Xuan , Mac Dinh Hung , Grée Rene 
Published: March 2024

AbstractSotolon (3‐hydroxy‐4,5‐dimethyl‐2(5H)‐furanone) has been synthezised both in racemic and enantioenriched forms by a short sequence involving intramolecular tandem isomerization‐aldolisation and tandem izomerization/Mannich reactions as key steps. Optically active Sotolon has been obtained by using (S)‐N‐tert‐butane sulfinimine as a chiral starting material.
Dye removal using cashew nut shell activated carbon
Authors: Khang Dinh Sy , Hai Tran Duy , Thi Ta Dinh , Tuan Phan Dinh 
Published: March 2024

AbstractActivated carbon prepared from agricultural byproducts and wastes could be used as an absorbent for dye removal from aqueous solution. Moreover, Vietnam has presently become one of the world's biggest cashew processing countries. Cashew nut shell has been considered as a hazardous solid waste. The wasted cashew nut shell should be used as a low cost source of activated carbon absorbent. The main approaches of this study are to optimize the conditions of activated carbon production from cashew nut shell and understand the adsorption mechanism of how the dye absorb onto cashew nut shell activated carbon. The absorption model developed in this study could be useful guide for assessing the independent impacts as well as the interactions between the impact parameters and give a good idea to enhance the absorption capacity. The experimental data was fitted well to the pseudo‐first and pseudo‐second order as well as the Elovich model at different initial MB concentrations. The inconsistence of the best‐fit‐kinetic model might result in difficulties in comprehensive understanding of adsorption mechanism. Other impacts, such as competitions of components, particle size could be included in next studies to develop the absorption models of the specific activated carbon prepared from cashew nut shell.
Directly Purification of Ostruthin from Paramignya trimera roots by CPC (centrifugal partition chromatography)
Authors: An Tran Chieu , Ngoc Pham Hong , Sang Pham Minh , Truc Pham Ngoc , Tien Nguyen Huynh Thuy , Nhu Tran Phan Huynh , Tam Phan Thi Thanh , Hung Le Ngoc , Van Trung Phung 
Published: March 2024

AbstractOstruthin was successfully isolated from the extract of Paramignya trimera (Oliver) Burkill roots by centrifugal partition chromatography (CPC) in one run. The two‐phase solvent system composed of n‐hexane‐ethyl acetate‐methanol‐water (2:1:2:1 v/v) in ascending mode (the upper organic phase was the mobile phase), with flow rate of 8.0 (mL/min) and rotation speed of 1600 rpm, was used. The purity of the ostruthin after isolation is 97.5 % confirmed by HPLC‐DAD at 320 nm. The present study highlights the ability of a CPC system to obtain high purity ostruthin directly from the P. trimera roots ethyl acetate extract.
Synthesis of 2‐(3‐methyl‐5‐oxo‐4,5‐dihydro‐1H‐pyrazol‐1‐yl) quinazolin‐4(3H)‐one derivatives
Authors: Bireddy Srinivasa Reddy , Rafeeq Mohammad , Chittireddy Venkata Ramana Reddy 
Published: March 2024

AbstractA simple, synthesis of 2‐(3‐methyl‐5‐oxo‐4, 5‐dihydro‐1h‐pyrazol‐1‐yl) quinazolin‐4(3H)‐one 6(a‐d) derivatives, an easy, clean, and economical methodology has been defined. The development of a new pathway for the preparation of substituted derivatives of Quinazoline Pyrazole is highlighted in this report. The mild, inexpensive polyphosphoric acid has proven to be an effective catalyst for excellent yields in the above multi‐component reaction. Widely available and mostly benign catalyst and easy purification are among the several attractive features.
Optimization of silver nanowire synthesis for flexible transparent conductive electrodes
Authors: Nhan Nguyen Thanh , Linh Pham Duy , Dat Doan Tien , Cho Min Ju , Choi Dong Hoon , Ha Hoang Mai 
Published: March 2024

AbstractIn this work, a range of factors was investigated for the synthesis of silver nanowires. Nickel chloride showed to be a promising controlling agent for the scale‐up synthesis of silver nanowires. Other factors such as reaction temperature, concentrations of surfactant, precursor, controlling agent, and the effect of degassing were studied and optimized. The synthesized silver nanowire sample was applied for flexible electrode fabrication. The fabricated electrode showed to have high transparency (90 %), low sheet resistance (26 Ω/sq), low surface roughness (Rq = 6 nm), and high bending stability (withstand 100 bending cycles at bending radius of 4 mm), which satisfied the requirement for applications in flexible optoelectronic device.
Effect of different polarity solvents on the anti‐inflammatory activity of Symplocos cochinchinensis leaves and correlation with total polyphenol content
Authors: Trieu Ly Hai , Trang Le Vu Khanh , Minh Nguyen Thai , Dao Phan Thi Anh 
Published: March 2024

AbstractSymplocos cochinchinensis leaves known as Vietnamese traditional herbal medicines which have been utilized anciently to support the medication of infirmities. The study aimed to explore the correlation of total polyphenol content (TPC) with anti‐inflammatory activity of S. cochinchinensis leaves. S. cochinchinensis leaf extracts (ethanol extract, chloroform, ethyl acetate, n‐butanol, aqueous fractions) was determined the TPC by Folin‐Ciocalteu reagent, anti‐inflammatory proficiency by in vitro protein denaturation and membrane lysis assays. The correlation between TPC and anti‐inflammatory activities was analyzed in silico by Pearson's method. Results illustrated that the TPC was arranged in sort of descending order as ethyl acetate fraction > n‐butanol fraction > ethanol fraction > aqueous fraction > chloroform fraction. S. cochinchinensis leaf extracts exhibited anti‐inflammatory effect via their protein denaturation inhibition capacity as well as hemolysis by heat and hypotonicity, which was better than the standard drug diclofenac sodium. There was a significantly negative correlation between TPC in S. cochinchinensis leaf extracts with their IC50 inhibition of protein denaturation, hemolysis by heat and hypotonicity with Pearson's correlation coefficient (r) of ‐0.6302, ‐0.7241, and ‐0.9101, respectively. It was suggested that S. cochinchinensis leaves have great potential for anti‐inflammatory activity during the high total polyphenol content. Hence, polyphenol compounds of S. cochinchinensis leaves should be considered since they can have good effects when in pure form.
Chrysin flavonoid adsorbed on B12N12 nanocage ‐ A novel antioxidant nanomaterial
Authors: Khalili Atefeh , Baei Mohammad T. , Ghaboos Seyed Hossein Hosseini 
Published: March 2024

AbstractAntioxidative activity of chrysin (CYS) on the B12N12 nanocage has been evaluated by density functional theory with B3PW91‐D3 and M06‐2X‐D3 methods. Adsorption behavior and study of topologies demonstrated that the CYS has chemisorbed to the nanocage and shows notable changes in the electronic properties of B12N12. The antioxidant properties of the CYS and CYS/B12N12 systems have been studied in the different environments by the M06‐2X‐D3 method. The findings demonstrated that in the vacuum phase and water, benzene, and ethanol solvents, the BDE (5O‐H), PDE, PA values of CYS/B12N12 are smaller than those of CYS system. The current study implied that B12N12 nanocage can increase the antioxidative properties of the CYS.
Triterpenoids from Macrosolen bidoupensis Tagane & V.S. Dang whole plant
Authors: Hung Le Kieu , Chi Huynh Bui Linh , Tuyen Pham Nguyen Kim , Trang Nguyen Thi Thuy , Van Son Dang , Mai Tran Thi Ngoc , Ky Nguyen Diep Xuan , Dat Bui Trong , Minh Phan Nhat , Tri Mai Dinh , Phat Nguyen Tan 
Published: March 2024

AbstractFrom the whole plants of Macrosolen bidoupensis Tangane & V.S. Dang, five triterpenoids, 24‐methylenecycloartanol (1), (23Z)‐cycloart‐23‐en‐3β,25‐diol (2), mollic acid (3), ursolic acid (4), 3β‐hydroxyurs‐11‐en‐28,13‐olide (5), together with two compounds, one C11‐norisoprenoid, loliolide (6), and one lignan, syringaresinol (7) were determined by using HR‐ESI‐MS, and NMR assignments. For the first time all compounds except 2 were clarified from the genus Macrosolen, whereas, compound 2 was verified from this species.
Overview on biodiesel market
Authors: Datta Indukamal , Ghosh Aniruddha , Acharjee Animesh , Rakshit Atanu , Saha Bidyut 
Published: March 2024

AbstractThe abundance of fossil fuel resources has been steadily declining since it was emerged on the Earth. As a renewable energy source, great importance has been provided to biodiesel and consequence to the factor it gains from the ascending fossil fuel price and its potential environmental amenities. The present report concerns some of the interesting spectacular studies for the global biodiesel market to ameliorate as an alternative fuel, while describing many advantages, challenges and future aspects of the biodiesel market.
Highly efficient in‐situ sulfur doped graphitic carbon nitride nanoplates as an artificial photosynthetic system for NADH regeneration
Authors: Gupta Sarvesh Kumar , Gupta Abhishek Kumar , Yadav Rajesh Kumar , Singh Ajeet , Yadav B. C. 
Published: March 2024

AbstractPhotocatalysis reduces the challenges associated with power activities by the conversion of solar energy into chemical energy. Herein, sulfur‐doped graphitic carbon nitride nanoplate (S‐g‐CN‐NP) via polycondensation and vapor oxidative treatment methods as a promising solar light‐reactive photocatalyst has been designed. The photo‐mediated reduction of NAD+ is used to facilitate the extremely efficient solar light‐driven photocatalytic selective production of nicotinamide adenine dinucleotide (NADH). The S‐g‐CN‐NP photocatalyst shown excellent optical and photoelectrical properties, supporting an NADH yield of (97±0.010 %), which was 1.5 folds higher than that of S‐g‐CN powder (65±0.012 %). Through the transformation of S‐g‐CN powder to nanoplates, the improvement of photocatalytic in S‐g‐CN‐NP was primarily ascribed to the growth of active sites of the nanoplates. The current study focuses on the creation and use of an S‐g‐CN‐NP photocatalyst for direct selective NADH regeneration under solar light.
Study on effects of isocyanate on some properties of epoxy varnish
Authors: Thanh Nguyen Trung 
Published: March 2024

AbstractThis article presents effect of toluene diisocyanate (TDI) as a curing agent on mechanical properties, drying time, chemical resistance, thermal oxidation stability of epoxy varnish coating. When TDI content raises from 3 to 11 weight percent (wt.%), relative hardness increases from 0.45 to 0.74 while adhesion, flexural strength, impact resistance down from 1 point, 2 mm, 200 Kg.cm to 2 points, 4 mm and 180 Kg.cm respectively. TDI content increases from 3 to 11 wt.%, grade 3 drying time of coating decreases rapidly, however, when TDI content reaches 11 wt.%, air bubbles appear. In addition, influence of TDI on chemical conditions, thermal oxidation stability of coating was also introduced.
Evaluating natural product compound inhibitors of SARS‐CoV‐2 main protease and spike protein target by molecular docking approach
Authors: Tung Bui Thanh , Nhung Nguyen Hong , Hang Ta Thi Thu , Linh Vu Khanh , Ngoc Le Minh 
Published: March 2024

AbstractSpike protein plays a significant role in viral transmission, while main protease's role is in the replication of the virus. In this study, we screened in silico natural products compounds activity to inhibit two targets of spike proteins and main proteases. Our data were compared with hydroxychloroquine and X77, which have been demonstrated inhibitory activity of these targets, respectively. Our results showed that 12/59 compounds have a higher ability to inhibit main protease than X77 and 59/59 compounds have a higher ability to inhibit spike protein than hydroxychloroquine. Notably, four compounds with the most strongly inhibitory activity of main protease are amentoflavone, punigluconin, amarogentin, emblicanin A. We found seven compounds with the most powerful inhibitory ability of spike protein are amentoflavone, hesperidin, rutin, glycyrrhizin, myricitrin, puerarin, daidzein. Among these compounds, ADMET profile and Lipinski's rule of five criterion analysis suggested four compounds including amentoflavone, myricitrin, purerarin and daidzein have drug‐likeness properties. Interestingly, amentoflavone is the natural compound with the highest inhibitory ability for main protease and spike protein, which may be further explored as anti‐SARS‐CoV‐2 agents.
In‐situ prepared S‐doped covalent melem framework as a photocatalyst with improved photocatalytic responses under solar light illumination
Authors: Singh Chandani , Yadav Rajesh K. , Kim Tae Wu 
Published: March 2024

AbstractMelem (M) is an emergent metal‐free material due to its nature abundance and easy preparation. Synergetic escalation of band gap generation and charge transfer of M to increase solar chemical synthesis ability remains a hot challenging topic yet. Herein, we designed first time in‐situ prepared sulfur‐doped covalent melem‐based frameworks (S‐CMFs) photocatalyst for NAD(P)H regeneration and 1,3‐oxathiolane‐2‐thiones production under solar light irradiation. S‐CMFs photocatalyst shows excellent photocatalytic stability and activity over the pristine CMFs and M. The presence of sulfur in frameworks drastically improved the photocatalytic efficiency of S‐CMFs due to its unique properties such as enhanced the solar light adsorption ability, molar extinction coefficient, slow charge recombination, fast charge separation and transportation of solar light to generate electrons‐holes. Hence, S‐CMFs photocatalyst has a vital role in the regeneration of NADH and NADPH with 54.84 and 51.05 % catalytic efficiencies and ~ 99 % for yields and selectivity of 1,3‐oxathiolane‐2‐thiones under solar light. This study demonstrates that the Z‐scheme hetero junction and photocatalytic reaction using S‐CMFs would be a suitable route for the production of solar fuel via artificial photosynthetic system.
Extraction of cynarine and chlorogenic acid from Artichoke leaves (Cynara scolymus L.) and evaluation of antioxidant activity, antibacterial activity of extract
Authors: Thang Nguyen Quoc , Hoa Vo Thi Kim , Van Tan Le , Tho Nguyen Thi Mai , Hieu Tran Quang , Phuong Nguyen Thi Kim 
Published: March 2024

AbstractArtichoke has been well known as a traditional medicine because of its phenolic compounds. In this study, solid‐liquid extraction, ultrasound‐assisted extraction, and enzyme‐assisted extraction were used to extract cynarine and chlorogenic acid from dry artichoke leaves. In the optimum experimental parameters: Enzyme concentration of 5.2 U/mL, pH of 4.6, and incubation of 29°C, the yield of cynarine and chlorogenic acid were determined to be 156.3 ± 2.3 mg/kg, and 19.8 ± 1.4 mg/kg of dry material, respectively, which were not significantly with the predicted value (154.5 mg/kg for cynarine, 19.4 mg/kg for chlorogenic acid). The artichoke leaves pectinase enzymes extract was studied antioxidant activity via DPPH and FRAP analysis. The IC50 was obtained in the artichoke extracts that showed the value of 30.0 mg/L for DPPH and 77.8 mg/L for FRAP. The artichoke extract was also studied antibacterial activity. The inhibition zones were 12 mm against Bacillus cereus at 50 mg/mL artichoke extract and 8 mm against Escherichia coli and Pseudomonas aeruginosa at 100 mg/mL artichoke extract. The artichoke extract using pectidase enzymes was high cynarine and chlorogenic acid which could have applications to diseases caused by oxidative damage and antibacterial damage.
Study on characteristics of thermoplastic starch based on Vietnamese arrowroot starch plasticized by glycerol
Authors: Van Khoi Nguyen , Tung Nguyen Thanh , Ha Pham Thi Thu , Trang Pham Thu , Duc Nguyen Trung , Thang Tran Vu , Phuong Hoang Thi , Huong Nguyen Thu , Phuong Nguyen Thi Lien 
Published: March 2024

AbstractIn this study, glycerol was used as plasticizer for the preparation of thermoplastic starch (TPS) from arrowroot starch (AS). Samples with different contents of glycerol (10, 20, 30 and 40 %wt) were prepared by extrusion technique. The properties of TPS were tested by analysis method. The FTIR, SEM and XRD data showed that the structure of arrowroot starch completely changed after extrusion process with the presence of glycerol at high temperatures. TPSs were plasticized and the relationship between plasticization degree and TPS properties was characterized and described by mechanical properties. The experimental results also showed that the tensile strength slightly decreased and the elongation at break significantly increased with the increase of the degree of plasticization.
Structural analysis and chemical descriptors analysis of 4‐aminopyridine adsorbed on M4 (M = Co, Ni, Cu) clusters: A DFT study
Authors: Pahuja Anushka , Jeyakumar Thayalaraj Christopher , Paularokiadoss Francixavier 
Published: March 2024

AbstractThe geometrical properties of 4‐Aminopyridine and the transition metal clusters M4 (M = Co, Ni and Cu) adsorbed 4‐Aminopyridine were examined using DFT/B3LYP/6‐31G*/LANL2DZ. The reactivity descriptors were thoroughly examined to determine which cluster had the best biological potential for adsorption. This molecule's bioactivity may be predicted using wavefunction‐dependent qualities such as the ones found in research such as the ones conducted using algorithms such as ALIEE, LOLE, LIE, ELF, RDG, and the NCI. The molecule has relevant adsorption energy on the surface of the metal clusters M4 (M = Co, Ni, and Cu).