Publications by authors named "Nguyen Van Tuyen"

Wastewater from seafood processing is a significant source of pollution, containing many harmful organic and inorganic compounds such as proteins, lipids, carbohydrates, nitrogen and phosphorus. This study investigated the enhancement of organic and nutrient removal efficiencies in seafood processing wastewater by integrating an Anaerobic Membrane Bioreactor (AnMBR) with an anoxic/oxic (AO) processes. A pilot-scale system was constructed with a capacity of 0.

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In a new approach, a series of 3-aroylimidazo[1,2-]pyridine derivatives were prepared in high yields. This approach revealed the direct Fe-catalyzed functionalization of imidazo[1,2-]pyridine derivatives with aryl aldehydes an aerobic oxidative cross-dehydrogenative coupling process. This transformation occurred in the presence of air, and FeBr served as a homogeneous Lewis catalyst.

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Background And Purpose: Ischemic stroke (IS) is classified into clinical subtypes and likely influenced by various lipid components. Nevertheless, the roles of apolipoprotein A-I (apoA-I), apolipoprotein B (apoB), and apoB/apoA-I ratio in different IS subtypes remain underexplored. This study aimed to investigate the differential distribution of plasma apoA-I and apoB levels among IS subtypes and to evaluate the predictive value of the apoB/apoA-I ratio in assessing IS subtypes and disease severity.

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Phytochemical study of the leaves of Guillaumin resulted in the isolation of a new natural product egonol-3''-sulphate (), and two new derivatives egonol-3-methylD-galactopyranoside () and 7-methoxy-2-(3',4'-methylenedioxyphenyl)-benzofuran-5-carboxamide (). Their chemical structures were -elucidated by spectroscopic data. Compounds and significantly established a great role for the chemotaxonomic aspect.

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Two different synthetic approaches to novel heterocyclic hybrid compounds of 4-azapodophyllotoxin were investigated. The obtained products were characterized by infrared spectroscopy, nuclear magnetic resonance spectroscopy, and high-resolution mass spectrometry. MTT protocol was then performed to examine the cytotoxic activity of these products against KB, HepG2, A549, MCF7, and Hek-293 cell lines.

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Four undescribed phenolic glycosides including three stilbene derivatives (1 and 3) and sodium salt of 3 (2), and a chalcone glycoside (4), together with thirteen known compounds (5-17) were isolated from the leaves of Syzygium attopeuense (Gagnep.) Merr. & L.

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Three undescribed triterpene glycosides syzybullosides A-C (1-3) along with fourteen known compounds were isolated from the leaves of Syzygium bullockii (Hance) Merr.& L.M.

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A new isopropyl chromone (1) and a new flavanone glucoside (2) together with eleven known compounds (3-13) were isolated from the leaves of Syzygium cerasiforme (Blume) Merr. & L.M.

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African swine fever virus (ASFV) causes African swine fever (ASF), a deadly disease affecting both domestic pigs and wild boars. ASF has become endemic in Vietnam since its first appearance in early 2019. Our previous molecular surveillance studies revealed that all the ASFV strains circulating in Vietnam belong to p72 genotype II, p54 genotype II, CD2v serogroup 8, and CVR of B602L gene variant type I.

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The current report describes the chemical investigation and biological activity of extracts produced by three fungal strains Fusarium oxysporum, Penicillium simplicissimum, and Fusarium proliferatum isolated from the roots of Piper nigrum L. growing in Vietnam. These fungi were namely determined by morphological and DNA analyses.

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Three prenylated xanthones, garcinone E (1: ), bannaxanthone D (2: ) and bannanxanthone E (3: ) were isolated from the leaves of Graib. Their structures were elucidated by spectral methods and compared with literature data. To evaluate their anti-proliferative effects in tumor cells, firstly, cisplatin was used as a positive control and the effects of compound 1:  - 3: were determined by performing MTT assay in MDA-MB-231, CNE-2 and A549 cancer cells.

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Herbaceous annual plants of the genus Xanthium are widely distributed throughout the world and have been employed medicinally for millennia. This contribution aims to provide a systematic overview of the diverse structural classes of Xanthium secondary metabolites, as well as their pharmacological potential. On searching in various reference databases with a combination of three keywords "Xanthium", "Phytochemistry", and "Pharmacology", relevant publications have been obtained subsequently.

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A new muurolane-type sesquiterpene, a new flavone arabinofuranoside derivative, and other five known flavone arabinofuranoside derivatives were isolated from the leaves of (Annonaceae family). Their chemical structures were determined to be (1,6,7)-muurola-4,10(14)-diene-15-ol (), quercetin 3---D-apiofuranosyl-(1→2)--L-arabinofuranoside (), quercetin 3---L-rhamnopyranosyl-(1→2)--L-arabinofuranoside (), quercetin 3---L-arabinofuranoside (), kaempferol 3---D-apiofuranosyl-(1→2)--L-arabinofuranoside (), kaempferol 3---L-rhamnopyranosyl-(1→2)--L-arabinofuranoside (), and kaempferol 3---L-arabinofuranoside () by analyses of HR-ESI-MS and NMR spectral data. Compounds and containing monosaccharide, arabinofuranoside, potentially inhibited NO productions in LPS activated RAW264.

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Three new xanthones, garcimckeans A-C () were isolated from the methanol extract of the stems of (Clusiaceae). Their structures were established by extensive spectroscopic analysis (HR-ESI-MS and 1 D and 2 D NMR) and by comparison of the spectral data with those reported in the literature. Compounds displayed weak cytotoxic activity toward KB, Lu, HepG2, and MCF7 cell lines using the MTT assay with IC values ranging from 71.

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Unsymmetrical tetradentate Schiff base Fe(III) and Cu(II) complexes were prepared by the coordination of some unsymmetrical tetradentate Schiff base ligands with CuCl·2HO or FeCl·6HO. The obtained complexes were characterized by ESI-MS, IR, and UV-Vis. The spectroscopic data with typical signals are in agreement with the suggested molecular formulae of the complexes.

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The chalcone derivatives of 20-oxo-lupanes have been synthesised and screened for some types of biological activity. Ozonolysis of lupanes afforded 20-oxo-derivatives with the following condensation using different aromatic aldehydes by Claisen‒Schmidt reaction to the target compounds. The configuration of 19-[3-(pyridin-3-yl)-prop-2-en-1-one]-fragment was established by X-ray analysis.

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From the ethyl acetate extract (EtOAc) of the Vietnamese leaves, a new flavone 8--glycoside 2'',6''-di--acetylvitexin (), together with six known analogs were isolated. Their structures were determined by spectral methods and compared with literature data. In α-glucosidase inhibitory assay, the EtOAc extract and its flavone and biflavone derivatives possessed the significant IC range of 9.

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Searching for bioactive agents from medicinal plants, eleven constituents were isolated from Polyscias guilfoylei stem for the first time, including a nucleoside uracil (1), two sterols β-sitosterol (2) and daucosterol (3), a saponin androseptoside A (4), two lignans (+)-pinoresinol (5) and (+)-syringaresinol (6), four phenolic acids protocatechuic acid (7), methyl protocatechuate (8), caffeic acid (9), and 5-O-caffeoylquinic acid (10), and a flavonoid quercitrin (11). Metabolites 1, 4, and 6-11 have never been observed in genus Polyscias before. Phenolic compounds 7 and 9 possessed the respective IC values of 21.

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New propene derivative 1-(3,4-methylenedioxyphenyl)-2-(2-hydroxy-5-(3-hydroxypropyl)-3-methoxyphenyl)prop-2-en-1-one (), along with three known triterpenoids ursolic acid (), pomolic acid (), and maslinic acid () were isolated from the leaves of species. All structures were assigned by spectroscopic analysis. Compound showed potent cytotoxicity against four cancer cell lines (KB, HepG2, Lu, and MCF7) with the IC values of 3.

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In this work, we treated chitin with 2-(azidomethyl)oxirane and successfully involved the resultant azido chitin derivatives in the ultrasound-assisted Cu(I)-catalyzed azido-alkyne click (CuAAC) reaction with propargylic ester of N,N,N-trimethyl glycine. Thus, we obtained novel water-soluble triazole chitin derivatives. The triazole chitin derivatives and their nanoparticles are characterized by a high in vitro antibacterial activity, which is the same or even higher than that of commercial antibiotics ampicillin and gentamicin.

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The title compound, CHNOS, obtained by alkaline treatment of 1,5-bis-(1-phen-oxy)-3-aza-pentane at moderate heating, is a -tosyl-ated secondary vinyl-amine. An intra-molecular S=O⋯H-C hydrogen bond generates a 13-membered ring. The benzalacetone moiety adopts a conformation with respect to the C=C double bond, which is slightly longer than usual due to the conjugation with a neighbouring acetyl group.

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Acute obstructive hydrocephalus is a complication of intraventricular hemorrhage, which requires a combination of medical and surgical treatments. We report a clinical case of intraventricular hemorrhage extension secondary to a ruptured arteriovenous malformation, successfully treated with a combination of methods: endovascular embolization of arteriovenous malformation, external ventricular drainage, intraventricular fibrinolysis with low-dose recombinant tissue plasminogen activator, and medical treatment with the neurotrophic drug Cerebrolysin in combination with neurorehabilitation.

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We used nanoparticles which possess simultaneously active (antimicrobial, UV-protective and antioxidant) and smart (temperature sensing) properties. The nanoparticles (2Rh = 450 nm, PDI = 0.118 ± 0.

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Background: Centipeda minima (the family Asteraceae) is an annual herbaceous plant native to the tropical regions, especially in eastern tropical Asia. C. minima is well-known in the list of medicinal plants with capacities in treatment of whooping cough, nasal allergy, malaria, and asthma.

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